Avalanche Bulletins

Avalanche Bulletins

Post by D War » Mon, 29 Dec 2008 01:52:27

 It is that time of year again and the bulletins are coming in daily over
the holidays.  Conditions are very dangerous out there because of all the
new snow over the past few days, with lots more in the forecast.  Play
safe........

To access these bulletins online go
here.....http://SportToday.org/

--------------------------------------------------------------------------------

South Coast
Avalanche Forecast  Date/Time issued:
Valid until:
Next Scheduled Update:  Friday, December 26, 2008 at 3:00 PM
Monday, December 29, 2008
Saturday, December 27, 2008

---------- Sea-to-Sky ----------
  Saturday Sunday Monday
Alpine 4 - HIGH 4 - HIGH 4 - HIGH
Treeline 4 - HIGH 3 - CONSIDERABLE 3 - CONSIDERABLE
Below Treeline 3 - CONSIDERABLE 3 - CONSIDERABLE 3 - CONSIDERABLE
---------- Duffy Lake & Inland Areas ----------
  Saturday Sunday Monday
Alpine 4 - HIGH 3 - CONSIDERABLE 3 - CONSIDERABLE
Treeline 3 - CONSIDERABLE 3 - CONSIDERABLE 3 - CONSIDERABLE
Below Treeline 2 - MODERATE 2 - MODERATE 2 - MODERATE

Confidence: Fair. Conditions could be quite variable throughout the region
due to a relatively wide range of precipitation with the next system.
Primary Concerns:
Storm Snow: New storm snow will overload a weak and shallow snowpack if the
forecast storm brings as much snow as expected.
Persistent Slab:   Additional loading by new snow and wind will increase the
likelihood of triggering deeper persistent weaknesses of facets or
facet/crust combos.
Wind Slab:   Previous and forecast strong southerly winds will produce weak
windslabs in exposed NE-NW facing slopes at treeline and above.

Special Message:   We have issued a special avalanche warning for the South
Coast for December 27-29. Recent very cold temperatures have weakened a thin
snowpack that is now being buried by heavy coastal snowfall. New snow and
windloading will overload the weak base, resulting in a rapid and
significant spike in avalanche danger. Due to the nature of the weak
snowpack we do not expect conditions to improve as quickly as we are used to
on the coast. Backcountry travel is not recommended at this time without
extensive training and experience.

--------------------------------------------------------------------------------

Travel Advisory   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
Incremental loading by new snow and wind is expected over the next several
days. Don't let the lure of new snow and improved riding conditions drive
you to make hasty and careless decisions. Prolonged very cold weather has
left us with a highly variable, complex, and weak snowpack. It is important
to be aware that this problem probably won't improve as quickly as we are
used to seeing on the coast. Safe travel requires extensive training and
experience. If you do go, careful attention to clues of instability and
making conservative terrain choices are crucial. Avoid large open slopes at
higher elevations, slopes that are exposed to overhead hazards like
avalanche paths or runouts, and steep or complex terrain, especially where
there are terrain traps below. I must stress that this is not a good time to
ride typical steep chutes and large complex slopes. Wait a little longer
before you start to think about charging into bigger terrain.
Avalanche Activity   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
There is one report of a natural avalanche large enough to bury or kill a
person in the Whistler area on Thursday. It occurred on a north-facing slope
in the alpine and initiated on a buried crust. Similar activity can be
expected, with greater probability and consequences, as the snow continues
to fall and the wind blows.
Snowpack   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
The most notable snowpack feature is that it is generally weak and shallow,
which is not typical for the South Coast at this time of year. Recent light
and dry new snow has been blown by moderate ridge top winds and formed soft
windslabs on northerly aspects behind ridges and terrain features. These new
windslabs are 15-40cm thick and are sitting on a variety of snow surfaces
including old dense windslabs, weak facetted snow, or a facet/crust combo.
The December 6th rain crust is down approximately 50-60cm and it may be
possible for a relatively small avalanche to step down to this layer and
produce a large and destructive avalanche.
Weather   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
Very heavy snow, strong SW winds, and a rising freezing level is expected
tonight. The freezing level should rise as high as 1500m close to the coast
and 1000m further inland. We could see 40-70cm (lower amount inland) by
Saturday afternoon. Flurries are expected on Sunday with periods of snow
developing in the evening and the freezing level should drop to 800m. Winds
should remain moderate from the west. Moderate snowfall is expected to
continue on Monday and Tuesday.
View Avalanche Observation Summary

Issued by:Peter Marshall

Important Notice: This is a regional forecast and significant variation may
exist within the forecast area. The information and danger ratings are
intended as a trip planning aid for recreational, backcountry users of
avalanche terrain; they are not meant to be used as the sole factor in
determining the avalanche danger presented by a specific slope. Always
include local weather, snowpack and avalanche observations in your decision
to travel in avalanche terrain. Observations and experience may lead to
different conclusions from what is reported or recommended. See disclaimer
for further details. The technical data used to produce these bulletins is
obtained from a variety of sources, including various government agencies
and private companies that participate in an industry-wide daily information
exchange program. These contributors provide data, resources, and funding
without which the Canadian Avalanche Centre could not provide this avalanche
information.
Avalanche information for other regions in western Canada is available
toll-free at 1-800-667-1105 or online at www.avalanche.ca

  This forecast sponsored by:

--------------------------------------------------------------------------------

North Columbia
Avalanche Forecast  Date/Time issued:
Valid until:
Next Scheduled Update:  Friday, December 26, 2008 at 4:00 PM
Monday, December 29, 2008
Saturday, December 27, 2008

---------- Cariboos ----------
  Saturday Sunday Monday
Alpine 3 - CONSIDERABLE 3 - CONSIDERABLE 3 - CONSIDERABLE
Treeline 3 - CONSIDERABLE 3 - CONSIDERABLE 3 - CONSIDERABLE
Below Treeline 2 - MODERATE 2 - MODERATE 3 - CONSIDERABLE
---------- Monashees & Selkirks ----------
  Saturday Sunday Monday
Alpine 4 - HIGH 3 - CONSIDERABLE 3 - CONSIDERABLE
Treeline 4 - HIGH 3 - CONSIDERABLE 3 - CONSIDERABLE
Below Treeline 3 - CONSIDERABLE 2 - MODERATE 3 - CONSIDERABLE

Confidence: Fair for the N. Monashees. Further north there is less
information and precipitation amounts are less certain and variable-if snow
amounts exceed 25cm on Saturday, then the N. Monashee danger ratings will
apply.
Primary Concerns:
Storm Snow: New storm snow with high winds could overload the weak snowpack.
Persistent Slab: The presence of persistent facet/crust combinations within
the snowpack gives the possibility for avalanches to run full path if they
are triggered by storm loading, or by backcountry travelers.

Special Message:   Mountain conditions are changing from what we've seen
over the last couple of weeks. The first major storm for a while is
forecasted to bring significant amounts of precipitation to the region. New
snow, accompanied with strong winds, will likely overload the existing
snowpack, which has been getting weaker and weaker due to the prolonged cold
temperatures. People are keen to get out, and have time to do so over the
holiday period, but don't let your enthusiasm, or that of your friends,
carry you to places you'll regret later on. I expect unstable conditions
will persist for longer than people expect-we could be entering an unusual
and dangerous period for the next few weeks. Play safe out there and get
into the habit of making consistent, cautious decisions.

--------------------------------------------------------------------------------

Travel Advisory   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
We've had a long, cold, dry period and that has created a fundamentally weak
snowpack. Now we're adding load in the form of new snow and wind, which
means we're going to see a change in mountain conditions, with avalanche
danger increasing this weekend and continuing into the foreseeable future.

Forecasted snow amounts are highest for the N. Monashees and the west of the
Cariboo area. If snow amounts come through on Saturday in the 25-40cm range,
accompanied by very strong winds, we can expect a significant natural
avalanche cycle. The touchy conditions will be ripe for both natural and
human triggers. Select simple, conservative terrain. Keep slope angles low
and avoid steep open slopes, as well as drops and rolls-now just isn't the
right time. The presence of persistent weak layers (PWLs) in the snowpack
means that avalanches may run full path, so stay well away from runout zones
and watch for the possibility for avalanches hitting you from above. This
last point is especially important to bear in mind if you are skiing or
riding in the sparse, sub-alpine trees at treeline, or are exposed to
overhead avalanche paths and runouts. It is especially important at this
time to travel one at a time and choose safe spots to group up in, well away
from steep, avalanche prone slopes.

Where snow amounts are more in the 10-20cm range, less natural avalanche
activity will be visible, but things will be gradually ramping up, just
waiting for a trigger. All the advice above about terrain selection, safe
travel techniques and the need for leaving extra margins of safety still
apply. The problem is that the danger won't be quite as obvious, so you need
even more diligence to remain safe now and looking ahead into the future.
Avalanche Activity   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
Due to the unusual similarity of the coastal snowpack, we can get good
information at this time by looking west. On the Coast, things are starting
to move; soft slabs are running on previous windslab surfaces. Cracking in
the snow, which is a good sign of instability, has also been noted.
Snowpack   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
About 10-20cm of new snow overlies a complicated and highly variable lower
snowpack. Buried windslabs exist on a variety of aspects and elevations.
There is lots of facet growth from the sustained cold, making the snowpack
generally weak. Crust layers, surrounded by weak layers of well developed
facets, are buried anywhere between 50 and 100cm. Particularly in thinner
spots, these could start to wake up with the additional new snow load,
giving the potential for avalanches to run big.
Weather   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
15-35cm new snow is expected for southern and western areas by Saturday
afternoon, with strong to extreme SW winds. Northern and eastern areas may
only see half of that. Temperatures are no longer expected to warm
considerably, and are expected to stay around -5?C during the storm.

On Sunday, light snow may persist in some areas but overall, snowfall will
taper off and clear up briefly. Temperatures -5 to -10?C. Moderate to
strong SW winds.

Another pulse of precipitation will come through on Monday. Snow amounts of
around 10-15cm are expected. Temperatures around -5?C.

View Avalanche Observation Summary

Issued by:James Floyer

Important Notice: This is a regional forecast and significant variation may
exist within the forecast area. The information and danger ratings are
intended as a trip planning aid for recreational, backcountry users of
avalanche terrain; they are not meant to be used as the sole factor in
determining the avalanche danger presented by a specific slope. Always
include local weather, snowpack and avalanche observations in your decision
to travel in avalanche terrain. Observations and experience may lead to
different conclusions from what is reported or recommended. See disclaimer
for further details. The technical data used to produce these bulletins is
obtained from a variety of sources, including various government agencies
and private companies that participate in an industry-wide daily information
exchange program. These contributors provide data, resources, and funding
without which the Canadian Avalanche Centre could not provide this avalanche
information.
Avalanche information for other regions in western Canada is available
toll-free at 1-800-667-1105 or online at www.avalanche.ca

  This forecast sponsored by:

--------------------------------------------------------------------------------

South Columbia
Avalanche Forecast  Date/Time issued:
Valid until:
Next Scheduled Update:  Friday, December 26, 2008 at 4:00 PM
Monday, December 29, 2008
Saturday, December 27, 2008

---------- S. Selkirks & S. Monashees ----------
  Saturday Sunday Monday
Alpine 4 - HIGH 3 - CONSIDERABLE 3 - CONSIDERABLE
Treeline 4 - HIGH 3 - CONSIDERABLE 3 - CONSIDERABLE
Below Treeline 3 - CONSIDERABLE 2 - MODERATE 3 - CONSIDERABLE
---------- Purcells ----------
  Saturday Sunday Monday
Alpine 3 - CONSIDERABLE 3 - CONSIDERABLE 3 - CONSIDERABLE
Treeline 3 - CONSIDERABLE 3 - CONSIDERABLE 3 - CONSIDERABLE
Below Treeline 2 - MODERATE 2 - MODERATE 2 - MODERATE

Confidence: Fair. The precipitation amounts associated with the incoming
storm may vary within the region.
Primary Concerns:
Storm Snow: New storm snow with high winds could overload the weak snowpack.
Persistent Slab: The presence of persistent facet/crust combinations within
the snowpack gives the possibility for avalanches to run full path if they
are triggered by storm loading, or by backcountry travelers.

Special Message:   Mountain conditions are changing from what we've seen
over the last couple of weeks. The first major storm for a while is
forecasted to bring significant amounts of precipitation to the region. New
snow, accompanied with strong winds, will likely overload the existing
snowpack, which has been getting weaker and weaker due to the prolonged cold
temperatures. People are keen to get out, and have time to do so over the
holiday period, but don't let your enthusiasm, or that of your friends,
carry you to places you'll regret later on. I expect unstable conditions
will persist for longer than people expect-we could be entering an unusual
and dangerous period for the next few weeks. Play safe out there and get
into the habit of making consistent, cautious decisions.

--------------------------------------------------------------------------------

Travel Advisory   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
We've had a long, cold, dry period and now we're adding load in the form of
new snow and wind. That means things are changing. Where snow amounts come
through on Saturday in the 30-40cm range, we can expect a significant
natural avalanche cycle. The touchy conditions will be ripe for both natural
and human triggers. Select simple, conservative terrain. Keep slope angles
low and avoid steep open slopes, as well as drops and rolls-now just isn't
the right time. The presence of persistent weak layers (PWLs) in the
snowpack means that avalanches may run full path, so stay well away from
runout zones and watch for the possibility for avalanches hitting you from
above. This last point is especially important to bear in mind if you are
skiing or riding in the sparse, sub-alpine trees at treeline, or are exposed
to overhead avalanche paths and runouts. It is especially important at this
time to travel one at a time and choose safe spots to group up in, well away
from steep, avalanche prone slopes.

Where snow amounts are more in the 10-25cm range, less natural avalanche
activity will be visible, but things will be all ready and primed, just
waiting for a trigger. All the advice above about terrain selection, safe
travel techniques and the need for leaving extra margins of safety still
apply. The problem is that the danger won't be quite as obvious, so you need
even more diligence to remain safe now and looking ahead into the future.
Avalanche Activity   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
Due to the unusual similarity of the coastal snowpack, we can get good
information at this time by looking west. On the Coast, things are starting
to move, with skiers starting to trigger soft slabs running on previous
windslab surfaces.
Loose snow avalanches have also been reported, and these could be
significant in shallower snowpack areas, especially in the Purcells, where
there is the possibility for the weak snow to scour to the ground.
Snowpack   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
About 15-30cm of new snow overlies a complicated and highly variable lower
snowpack. Buried windslabs exist on a variety of aspects and elevations.
There is lots of facet growth from the sustained cold, making the snowpack
generally weak. Crust layers, surrounded by weak layers of well developed
facets, are buried anywhere between 50 and 100cm. Particularly in thinner
spots, these could start to wake up with the additional new snow load,
giving the potential for avalanches to run big.

Weather   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
15-35cm new snow is expected by Saturday afternoon, with strong to extreme
SW winds. Temperatures warming only slightly, and are expected to stay below
freezing during the storm (around -5C at treeline).

On Sunday, light snow may persist in some southern areas but most areas
becoming dry and clearing for a brief period. Temperatures -5 to -10C. Winds
moderating as a weak ridge builds.

Another pulse of precipitation will come through on Monday. Snow amounts of
around 10-15cm are expected. Temperatures around -5C.

View Avalanche Observation Summary

Issued by:James Floyer

Important Notice: This is a regional forecast and significant variation may
exist within the forecast area. The information and danger ratings are
intended as a trip planning aid for recreational, backcountry users of
avalanche terrain; they are not meant to be used as the sole factor in
determining the avalanche danger presented by a specific slope. Always
include local weather, snowpack and avalanche observations in your decision
to travel in avalanche terrain. Observations and experience may lead to
different conclusions from what is reported or recommended. See disclaimer
for further details. The technical data used to produce these bulletins is
obtained from a variety of sources, including various government agencies
and private companies that participate in an industry-wide daily information
exchange program. These contributors provide data, resources, and funding
without which the Canadian Avalanche Centre could not provide this avalanche
information.
Avalanche information for other regions in western Canada is available
toll-free at 1-800-667-1105 or online at www.avalanche.ca

  This forecast sponsored by:

--------------------------------------------------------------------------------

Kootenay Boundary
Avalanche Forecast  Date/Time issued:
Valid until:
Next Scheduled Update:  Friday, December 26, 2008 at 4:00 PM
Monday, December 29, 2008
Monday, December 29, 2008

---------- Kootenay Boundary ----------
  Saturday Sunday Monday
Alpine 4 - HIGH 3 - CONSIDERABLE 3 - CONSIDERABLE
Treeline 4 - HIGH 3 - CONSIDERABLE 3 - CONSIDERABLE
Below Treeline 2 - MODERATE 2 - MODERATE 3 - CONSIDERABLE

Confidence: Poor. There is limited information and new snow amounts and
existing snowpack structure is highly variable throughout the region.
Primary Concerns:
Storm Snow: New storm snow could overload a weak and shallow snowpack if the
forecast storm brings as much snow as expected.
Wind Slab:   Very strong winds have formed deep pockets of windslab in
exposed lee and cross-loaded terrain.

Special Message:   We are expecting another system to bring significant
snowfall, strong winds, and slightly warmer temperatures beginning on Friday
night and lasting through the day on Saturday. Conditions are such that
these factors will result in a rapid increase in avalanche danger. We are
urging backcountry users to make conservative terrain choices at this time
and to check back for daily updates throughout the holiday period.

--------------------------------------------------------------------------------

Travel Advisory   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
A very weak and complex snowpack is now buried by a substantial amount of
new snow. This new snow will be very inviting but it will also disguise the
unusual snowpack, so don't let it lure you into making hasty or careless
decisions. Strong winds, new snow, and slightly warmer temperatures should
result in the development of a cohesive surface slab. As this happens the
likelihood of natural and human-triggered avalanches will increase. Avoid
large open slopes, complex or challenging terrain (especially convex rolls),
and exposing yourself to obvious avalanche paths and runouts. Remember that
these new soft slabs and windslabs are sitting on a variety of potential
sliding surfaces and a generally weak snowpack. There is potential for
avalanches to step down to deeper weak layers or involve the entire snowpack
and result in large and destructive avalanches. Your safest option is to
stick to low-angle glades that are not exposed to overhead avalanche paths
or runouts. Also, keep in mind that conditions are not expected to improve
quickly due to the very weak, facetted snow base.
Avalanche Activity   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
I expect that it is possible for a light load (skier, additional snow
loading) to trigger an avalanche large enough to bury or kill a person in a
variety of terrain. Be especially wary of exposed lee and cross-loaded
slopes at treeline and above, and steep, open slopes with smooth underlying
ground. Recent reports from the area are mentioning recent small slab
avalanches and shooting cracks on windslabs near ridge top. This is
certainly a sign that conditions are deteriorating and triggering an
avalanche is more likely.
Snowpack   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
Areas closest to the border, like Rossland and Kootenay Pass, have received
up to 40cm of cold, dry snow. Strong southeast mountaintop winds have formed
deep, dense windslabs in exposed terrain at treeline and above. Under the
new snow is a generally weak and shallow snowpack. In some areas the entire
lower snowpack consists of weak facetted snow, while others are still
finding a facet/crust combo down approximately 50cm.
Weather   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
Snow is expected for tonight and Saturday. We could see 25-40cm of snow by
tomorrow night. Winds are forecast to be very strong from the W-SW. Slightly
warmer temperatures are expected on Saturday afternoon, but the Freezing
level should stay at valley bottom. Westerly flow sets up on Sunday with
cooler temperatures and light snowfall. Mountaintop winds should remain very
strong from the west. Another disturbance is expected on Monday bringing
moderate snowfall.
View Avalanche Observation Summary

Issued by:Peter Marshall

Important Notice: This is a regional forecast and significant variation may
exist within the forecast area. The information and danger ratings are
intended as a trip planning aid for recreational, backcountry users of
avalanche terrain; they are not meant to be used as the sole factor in
determining the avalanche danger presented by a specific slope. Always
include local weather, snowpack and avalanche observations in your decision
to travel in avalanche terrain. Observations and experience may lead to
different conclusions from what is reported or recommended. See disclaimer
for further details. The technical data used to produce these bulletins is
obtained from a variety of sources, including various government agencies
and private companies that participate in an industry-wide daily information
exchange program. These contributors provide data, resources, and funding
without which the Canadian Avalanche Centre could not provide this avalanche
information.
Avalanche information for other regions in western Canada is available
toll-free at 1-800-667-1105 or online at www.avalanche.ca

  This report is produced by the North Shore Avalanche Advisory Group

--------------------------------------------------------------------------------

North Shore
Avalanche Forecast  Date/Time issued:
Valid until:
Next Scheduled Update:  Friday, December 26, 2008 at 3:00 PM
Monday, December 29, 2008
Saturday, December 27, 2008

---------- North Shore ----------
  Saturday Sunday Monday
Alpine ~ ~ ~
Treeline 4 - HIGH 2 - MODERATE 3 - CONSIDERABLE
Below Treeline 4 - HIGH 1 - LOW 2 - MODERATE

Confidence: Good. There is more certainty about the details of the
approaching warm front.
Primary Concerns:
Storm Snow: More snow and rising temperatures are expected and the dense new
snow, followed by rain, should overload a weak underlying snowpack resulting
in a sharply rising avalanche danger trend.

Special Message:   We have issued a special avalanche warning for the North
Shore for December 26-29. We are experiencing rapid changes in the
mountains. Significant snowfall and rising temperatures are expected
tonight. This new snow/rain is falling on a shallow, complex, and unusual
snowpack. These factors will result in sharp spike in avalanche danger and
we are urging people to avoid the backcountry until conditions begin to
improve late Saturday and into Sunday. We will be issuing daily updates, so
please check back for more information.

--------------------------------------------------------------------------------

Travel Advisory:   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
The key message at this time is to be aware of rapidly changing conditions.
Over the next 24 hours we can expect a sharp rise in avalanche danger. The
forecast is calling for snow turning to rain tonight and followed by cooling
later on Saturday. The heavy rain should cause a natural avalanche cycle
overnight that eases off throughout the day on Saturday. Backcountry travel
is not recommended on Saturday morning. Travel conditions should be very
difficult with deep and heavy snow. If we see less rain than forecast then
the avalanche danger could remain elevated for longer. If you are out on
Saturday morning and it's still snowing then it is likely that avalanche
danger is still high. I recommend waiting until this system passes through.
We should see a return to cooler temperatures and more snow by Sunday.
Avalanche Activity:   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
There are several reports of small skier-triggered avalanches and numerous
whumpfs from Wednesday afternoon. One slide was triggered by two skiers on
an open convex roll and took them for a short ride. Significant natural
avalanche activity is expected to begin by Friday evening and peak
overnight. Avalanches should be less likely by Sunday, but the possibility
of human-triggered avalanches could remain.
Snowpack:   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
New snow is rapidly accumulating over a thin melt-freeze crust. A widespread
layer of feathery surface hoar is buried by 50-70cm of snow. The additional
weight of new snow and rain will overload this weakness and avalanches are
almost certain. At around 30-40cm above the ground there is a layer of weak
facetted snow overlying a thin crust. This facet/crust combo may be a
concern at higher elevations in open slopes with smooth ground cover
underneath.
Weather:   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
For tonight, we should see 20-30cm of snow before the freezing level rises
to 1500m overnight and snow turns to rain. 30-50mm of rain are expected
overnight and through the day on Saturday. The freezing level should drop
and Saturday afternoon and we could see a few flurries late in the day.
Moderate snowfall is expected on Sunday and Monday with the freezing level
lowering to 600m.
View Avalanche Observation Summary

Prepared by:Peter Marshall

Reporting Area: The North Shore Mountains between Mount Seymour Provincial
Park in the east and Cypress Provincial Park in the west, extending north
one kilometre past the municipal boundaries of North & West Vancouver
Avalanche information for other regions in western Canada is available
toll-free at 1-800-667-1105 or online at www.avalanche.ca

  This report sponsored by

--------------------------------------------------------------------------------

North Rockies - BC
Avalanche Report  Date/Time issued:
Valid until:
Next Scheduled Update:  Thursday, December 25, 2008 at 8:00 AM
Thursday, December 25, 2008
Thursday, January 01, 2009

---------- North Rockies - BC ----------
  Thursday
Alpine 2 - MODERATE
Treeline 2 - MODERATE
Below Treeline 1 - LOW

Confidence: Poor-No field data.

Primary Concerns:
Special Message:
I strongly suspect conditions are similar to the North Columbia region. Read
the North Columbia forecast to see if it fits with what you are seeing in
this region. Talking to knowledgeable residents and getting local
information is strongly advised.

--------------------------------------------------------------------------------

Travel Advisory:   Issued: Thu, Dec 25 Next Scheduled Update: Thu, Dec 25

As your travel plans develop through the holidays be aware of the
complicated nature of the current snowpack.

Below treeline in many locations there is not enough snow to avalanche. The
most obvious issue at this time is the new incoming snowfall. Choosing
smaller terrain, and avoiding large convexities and terrain traps will help
reduce your exposure to this growing hazard.

The lingering problem for now is that the snowpack is still very thin for
this time of year. At treeline and above, the wind and cold temperatures
have created hard wind slabs sitting on weak facets and facet-crust
combinations. The consequences of being caught in a hard slab avalanche can
be surprisingly high. Even small avalanches can cause injury and/or carry a
person into terrain traps or other hazards such as trees and rocks. To
reduce your exposure, avoid large, smooth, open pieces of terrain and pay
attention to what lies in the runout below these features. To complicate
matters, the new snow will now make identifying the location of these hard
slabs more difficult. Paying attention to the shape of the slopes and where
the old snow feels hard and hollow below the new snow may help.

Avalanche Activity:   Issued: Thu, Dec 25 Next Scheduled Update: Thu, Dec 25

I have no information as to recent avalanche activity. If my comparison to
the North Columbias holds true, there has been little recent activity with
the cold temperatures. Expect this to change with the changing weather.

Snowpack:   Issued: Thu, Dec 25 Next Scheduled Update: Thu, Dec 25

I suspect the cold temperatures, winds and shallow snowpack may have created
a very loose unconsolidated snowpack with a variety of surfaces on top. As
well, I believe the winds may have created a variety of surfaces of hard
wind slabs, wind crusts, scoured ridges and wind loaded pockets on lee
aspects and in gullies. This type of base to the snowpack is a classic weak
base for new snow. New snow may not stick well to the facets, crusts or
surface hoar that exist. Be aware of quickly changing conditions with rising
temperatures and new snowfall.

Weather:   Issued: Thu, Dec 25 Next Scheduled Update: Thu, Dec 25

There are continued flurries for today, and Friday. A short break for the
weekend and then rising temperatures and continued snowfall through the rest
of next week.

View Avalanche Observation Summary

Issued by:abrown

Important Notice: This is a regional forecast and significant variation may
exist within the forecast area. The information and danger ratings are
intended as a trip planning aid for recreational, backcountry users of
avalanche terrain; they are not meant to be used as the sole factor in
determining the avalanche danger presented by a specific slope. Always
include local weather, snowpack and avalanche observations in your decision
to travel in avalanche terrain. Observations and experience may lead to
different conclusions from what is reported or recommended. See disclaimer
for further details. The technical data used to produce these bulletins is
obtained from a variety of sources, including various government agencies
and private companies that participate in an industry-wide daily information
exchange program. These contributors provide data, resources, and funding
without which the Canadian Avalanche Centre could not provide this avalanche
information.
Avalanche information for other regions in western Canada is available
toll-free at 1-800-667-1105 or online at www.avalanche.ca

Glacier National Park

Issued:
 Friday, December 26, 2008   08:00

Valid Until:
 Until Further Notice

Bulletin Area:
 This bulletin covers the areas adjacent to the Trans Canada Highway
corridor in Glacier National Park and the drainages directly accessed from
this corridor.

Large Areas of Glacier National Park Are CLOSED For Avalanche Control Using
EXPLOSIVES For access information visit the Rogers Pass Discovery Centre

Danger Rating:   Friday    Saturday    Sunday
 Alpine 2-Moderate  4-High  3-Considerable
 Treeline 2-Moderate  4-High  3-Considerable
 Below Treeline 1-Low  3-Considerable  2-Moderate

Avalanche Danger Rating Descriptions

Synopsis:

Cold and dry conditions for the past 2 weeks have left a weak and facetted
snow surface and upper pack. Temperatures are beginning to moderate as the
first significant pacific system since the start of dry spell is poised to
affect the area tonight and tomorrow. Forecast heavy snow will increase
avalanche danger sharply, likely to HIGH levels, tomorrow. For today, two
main snowpack concerns remain: areas of windslab and the persistent buried
crusts which are breaking down under the influence of cold temperatures.

The windslab condition exists in alpine and treeline areas, where many days
of strong winds have created a highly variable patchwork of hard windslabs,
wind pressed snow, and areas blown bare. Stability tests in recent days show
shallow windslabs failing in the easy range down 5 to 30cm.  Backcountry
travelers should avoid steep slopes and cross-loaded gullies, where
triggering these slabs is possible.

The buried crusts down 70 to 100cm were giving variable results in tests
recently and may become more of a concern with additional loading. These
layers are believed to be difficult for skiers to trigger, however if
initiated could result in a serious avalanche. Thin and rocky snowpack areas
are the most likely points where triggering could occur, particularly at or
near treeline elevations.

Also of note, due to the recent low temperatures, is faceting in the upper
snowpack at and below treeline, which is causing fast, loose sluffing in
steep undisturbed terrain.

Link to Recent Profiles

Avalanche Activity:
 No new avalanches have been observed for the past few days.  The most
recent activity observed was on December 21, with a few small avalanches to
size 2.0 in the highway corridor from unskiable terrain.  Of note however
was a pair of size 2.5 slab avalanches from a high west aspect that ran on
the November basal crust. Skier-triggered avalanches involving the hard
windslab are still possible, especially near ridgecrests, around terrain
features, and in cross-loaded gullies. A natural avalanche cycle is expected
tomorrow.

Outlook:
 Two pacific systems will track across the province tonight and tomorrow
bringing significant snowfall.  The snow is forecast to begin this
afternoon, then continue overnight through Saturday. Amounts up to 35cm are
possible with strong southwest winds and a slight warming trend. The snow
tapers off on Sunday while temperatures remain near seasonal normals. Expect
avalanche hazard to rise sharply on Saturday as the forecast as described
will set up soft slab conditions over the existing weak and facetted surface
layer.

Travel Conditions:
 Moderate trailbreaking to treeline with 30 to 40cm of ski penetration.
Large areas of wind affected snow in the alpine are causing less
penetration. Recent cold temperatures are causing extensive faceting of the
snow pack and as a result many of the alders that were buried are popping
back up. At very low elevations buried rocks and obstacles still pose a
threat to people and equipment.  JG

Past 24 hour weather:  Rogers Pass (1315m)  Mt. Fidelity (1905m)
Maximum (???C)  -12.0 -11.0
Minimum (???C)  -18.0 -18.0
Snowfall (cm)  trace trace
Precipitation (mm)  0.5 0.2
Snowpack (cm)  88 170
Wind speed  Moderate (26-40 km/h) Light (1-25 km/h)
Ridgetop wind direction  S Variable

FOR MORE DETAILS:

Warden Office: (250) 814-5202
Emergency: 1-877-852-3100
24 Hours Recorded Message: (250) 837-6867
Related Link: http://SportToday.org/

Important Disclaimer Information

--------------------------------------------------------------------------------

Banff, Yoho and Kootenay National Parks

Issued:
 Friday, December 26, 2008   15:53

Valid Until:
 Saturday, December 27, 2008   16:30

Bulletin Area:
 This forecast covers the east and west sides of the Continental Divide from
the Wapta Icefields area in the north to the Sunshine area in the south. It
also includes the Main Range area from Lake Louise to Bow Summit.

Danger Rating:   Friday    Saturday    Sunday
 Alpine 2-Moderate  2-Moderate  3-Considerable
 Treeline 2-Moderate  2-Moderate  3-Considerable
 Below Treeline 1-Low  1-Low  2-Moderate

Avalanche Danger Rating Descriptions

Synopsis:
 A strong Pacific storm is finally going to bump the entrenched cold air
eastwards and bring us some snowfall over the next couple of days. Forecast
models are differing once again on how much precipitation will make it over
to the Rockies, but with a strong moisture stream and warm overrunning air
we can expect 5 -15 cm at the least by Sunday. Winds have already picked up
into the moderate range from the southwest, and some fresh new windslabs are
building this afternoon.

With new snow and wind we will begin to see the avalanche danger rise. The
present snow surface consists of facets and small surface hoar, and the
entire snowpack is weak and facetted. At the base of this sugar heap, the
November rain crust is still intact and will create a superb sliding layer
for avalanches. There is a very good potential that any avalanche that gets
going will involve the whole season's snow.

The take home message is once again conservative route selection. Stay off
of the big features and the steeper slopes and you should be OK.

Avalanche Activity:
 A few small windslabs were noted in really steep terrain just near the
ridge crests today. Otherwise, there is still good evidence of the recent
avalanche cycle where large slabs were pulling out down to the November
Crust. As the snowpack becomes more unstable with further load, wind, and
warming, the layer will wake up again.

Outlook:
 We look to be heading into a strong westerly flow for next week. The main
storm track looks to be near the Canada US border, so we should see some
warmer temperatures but maybe not too much snowfall. The avalanche danger
may decrease slightly again with only one small additional snowfall. This
drib drab pattern over a persistent weak layer generally sets up a long
period of lingering danger and will also dictate a long period where
conservative terrain choice is warranted.

Travel Conditions:
 Fatter areas at treeline are pretty good with some variable windslab. Off
track below treeline is getting very weak. Most of the alpine is wind
hammered. JBW

Past 24 hour weather:  Bow Summit (2010m and 2925m)  Sunshine (2195m and
2620m)  North Kootenay (1985m and 2405m)
Maximum (???C)  -11 -15 -11
Minimum (???C)  -19 -19 -18
Snowfall (cm)  0 1 0
Precipitation (mm)  0 0 0
Snowpack (cm)  61 83 97
Wind speed  Moderate (26-40 km/h) Moderate (26-40 km/h) Moderate (26-40
km/h)
Ridgetop wind direction  W W SW

FOR MORE DETAILS:

Warden Office: (403) 762-1470
Emergency: 403 762 4506
24 Hours Recorded Message: 1-800-667-1105
Related Link: http://SportToday.org/

Important Disclaimer Information

--------------------------------------------------------------------------------

Jasper National Park

Issued:
 Friday, December 26, 2008   13:26

Valid Until:
 Until Further Notice

Bulletin Area:
 The forecast area covers the Continental Divide, eastwards to the Maligne
Lake drainage and from Saskatchewan River Crossing in the south to Hwy 16 in
the north.

Danger Rating:   Friday    Saturday    Sunday
 Alpine 2-Moderate  3-Considerable  3-Considerable
 Treeline 2-Moderate  3-Considerable  3-Considerable
 Below Treeline 1-Low  2-Moderate  2-Moderate

Avalanche Danger Rating Descriptions

Synopsis:
 The past 8 days consistent cold temperatures and no snow has resulted in
very little change in the snowpack other than continued development of
facets in the midpack, facets above the basal November crust, and depth hoar
on the ground. All potentially weak layers. Generally, in the alpine, hard
slabs of varying thickness overlie all this. Snow below treeline can be
found to be shallow, completely rotten, and barely supportive of skier
weight. Hard slab avalanches can be difficult to predict and when triggered,
from a shallow spot for example, can step down and result in larger
avalanches. The weekend will see an incoming storm bringing possibly 25cm of
snow by Sunday. Many slopes may reach critical values overloading these
weaknesses resulting in an increase in natural and human triggered
avalanches. It is important to treat these layers with respect and make
conservative decisions. Happy Holidays.

Avalanche Activity:
 On Friday, a few more size 1 "facetlanches" were observed on steep rocky
terrain in the Icefields area. These were large enough to be a concern for
ice-climbers.

Outlook:
 Friday night through to Sunday may be windy and stormy. We could receive
potentially 25cm by Sunday but at the time of writing, the storm looks like
it will graze us and travel more South. The avalanche danger will increase
on Saturday and Sunday depending on how this storm arrives.

Travel Conditions:
 Alpine travel is a mix of linking hardslabs to avoid the scoured rocky
terrain features. Good turns in the alpine and treeline are few and far
between making for challenging skiing. Below treeline snow is barely
supportive. Happy holidays.

0800 weather:  Parker Ridge (2010m and 2350m)  Marmot Basin (1985m and
2360m)
Maximum (???C)  -14 -17
Minimum (???C)  -25 -20
Snowfall (cm)  0.1 0.1
Precipitation (mm)  ~ ~
Snowpack (cm)  77 64
Wind speed  Moderate (26-40 km/h) Light (1-25 km/h)
Ridgetop wind direction  SW N

FOR MORE DETAILS:

Warden Office: (780) 852-6155
Emergency: 1-877-852-3100
24 Hours Recorded Message: (780) 852-6176
Related Link: http://SportToday.org/

Important Disclaimer Information

--------------------------------------------------------------------------------

Waterton Lakes National Park

Issued:
 Friday, December 26, 2008   15:37

Valid Until:
 Sunday, December 28, 2008   1600

Bulletin Area:
 This bulletin covers Waterton Lakes National Park, including the
Continental Divide area.

Danger Rating:   Friday    Saturday    Sunday
 Alpine 3-Considerable  3-Considerable  3-Considerable
 Treeline 2-Moderate  3-Considerable  3-Considerable
 Below Treeline 1-Low  2-Moderate  2-Moderate

Avalanche Danger Rating Descriptions

Synopsis:
 We're seeing perhaps the start of the first real avalanche cycle of the
season, as natural slides have occurred on a steep, snow-loaded alpine
slope.  Obviously the potential for human-triggering is also increasing as
the westerly flow continues to move snow onto north and east facing terrain
and other lee features.   Potential failure layers for slab avalanches exist
within the storm snow layers near the surface, as well as deeper within the
snowpack.  Very cold temperatures have weakened the snowpack underneath the
slab, which could be 50cms or more in thickness.  Where not affected by
wind, the generally shallow snowpack is unusually weak and unsupportive,
conditions we don't often experience in the Waterton area.

Avalanche Activity:
 Two natural slab avalanche releases were observed Friday morning, probably
from within the past 12 hours.  Both releases were in a large open bowl near
the 2300m level on a steep easterly aspect.  One smaller slide occurred from
within the storm snow layers involving a slab 10 to 20cms thick.  Nearby on
the same slope the smaller slab pulled out a deeper size 2 avalanche about
50cms thick.

Outlook:
 Avalanche danger is expected to stay in the Considerable range as strong
west winds and a series of weekend storms tracks through the area.  Snowfall
amounts in the range of 10 to 20cms appears likely near the continental
divide.  We'll probably continue to see a few natural avalanches from
steeper north and east facing terrain; travellers should be very cautious
about entering such terrain this weekend, as things will be touchy out
there.   The extra weight of person or snowmobile could easily trigger a
slide.  Best to avoid such areas until snow conditions and avalanche danger
improve.

Travel Conditions:
 Variable board/ski penetration up to 60cms can be expected, with hard and
soft slabs on wind-loaded slopes.  Strong westerly's continue to strip the
snow from exposed terrain.  Off-trail below treeline is not recommended due
to exposed sh***y, as well as stumps and rocks hiding under the thin and
unsupportive snowpack.  BK

Past 24 hour weather:  Little Prairie (1650m)
Maximum (???C)  -7
Minimum (???C)  -17
Snowfall (cm)  5
Precipitation (mm)  ~
Snowpack (cm)  40
Wind speed  Moderate (26-40 km/h)
Ridgetop wind direction  SW

FOR MORE DETAILS:

Warden Office: (403) 859-5140
Emergency: (403) 859-2636
24 Hours Recorded Message: 1-800-667-1105
Related Link: http://SportToday.org/

Important Disclaimer Information

--------------------------------------------------------------------------------

Backcountry Avalanche Report
Last Avalanche Report Entered On : Friday, December 26, 2008 2:13:00 PM

Report Valid For Period Starting : Saturday, December 27, 2008 until further
notice.

This report is for backcountry terrain only. Skiing conditions for facility
areas are not included in this report.
For current trail conditions please see our Trail Reports.

Avalanche Danger Scale Saturday Sunday Monday
Alpine Moderate Moderate Moderate
Treeline Low Low Low
Below Treeline Low Low Low

Discussion:

Here is hoping you all had a Merry Christmas and a great turkey feed. In the
last 24 hour period there has been little change in the status of the danger
scale. Today saw a beautiful sunrise and clear skies for excellent photo
opportunities.

There was an observed increase in the wind speed at ridge line today. The
forecast calls for a continued increase to the speed at ridge top in the
strong with possible extreme gusting from the west. This action will
continue to transport any available snow from westerly slopes to lee
aspects.

The forecast is predicting some flurry activity either later today and/or
into the weekend. Amounts of precipitation for the area appear to be very
slight. These forecasted low precipitation amounts and strong winds will
likely have no significant change to the avalanche danger. Temperatures will
remain cool and the temperature gradient will continue to show faceting
within the snowpack.

Alpine areas will continue to produce slab conditions. If the winds drop in
elevation, this may become evident at treeline as well.

Backcountry Travel Conditions:

Observations continue to show difficult ski travel conditions off pre-set
trails. Hazards such as hidden rocks, deadfall, and small trees and bushes
are still the main concern when traveling to new destinations. Skiing
potential destinations are still very limited to non-existant. Snowshoeing
offers the greatest potential to travel without continuous hidden hazard
difficulties. Ice climbers still need to watch out for brittle ice
conditions, but with these moderating cool temperatures, healing of the ice
colums is taking place.

However you plan to enjoy the outdoors, have fun and play safe.

Important Notice:
Snowpack structure and stability information is determined from field
analysis specific to snow study plot sites. Snowpack structure and stability
will vary as you travel throughout mountainous terrain. It is, therefore,
the responsibility of the backcountry traveller to be self-sufficient in
being able to perform self-rescue should you, the traveller, be involved in
an accident. Also, backcountry travellers are responsible for obtaining
their own information concerning current weather conditions, snow, winds,
snowfall, etc. and are responsible for educating themselves to the best
possible awareness level.

--------------------------------------------------------------------------------
If you would like to unsubscribe from the avalanche bulletin or to change
your settings then please use the link below:
http://SportToday.org/

  This forecast sponsored by:

--------------------------------------------------------------------------------

South Rockies
Avalanche Forecast  Date/Time issued:
Valid until:
Next Scheduled Update:  Friday, December 26, 2008 at 5:00 PM
Monday, December 29, 2008
Saturday, December 27, 2008

---------- Fernie - Lizard Range ----------
  Saturday Sunday Monday
Alpine 4 - HIGH 3 - CONSIDERABLE 3 - CONSIDERABLE
Treeline 3 - CONSIDERABLE 3 - CONSIDERABLE 3 - CONSIDERABLE
Below Treeline 2 - MODERATE 2 - MODERATE 3 - CONSIDERABLE
---------- Elk Valley & Crowsnest Pass ----------
  Saturday Sunday Monday
Alpine 2 - MODERATE 2 - MODERATE 2 - MODERATE
Treeline 2 - MODERATE 2 - MODERATE 2 - MODERATE
Below Treeline 1 - LOW 1 - LOW 1 - LOW

Confidence: Fair-poor. Limited reports for this region.
Primary Concerns:
Storm Snow: New storm snow with high winds could overload the weak snowpack.
Wind Slab: Forecasted new snow with wind will create wind slab conditions,
particularly on east and northeast aspects.

Special Message:   Mountain conditions, especially around Fernie and the
Lizard ranges, are changing from what we've seen over the last couple of
weeks. Snow has been steadily accumulating and there is another storm on its
way for Saturday. There is a chance that the Fernie Alps will see
significant amounts of precipitation, and new snow, accompanied with strong
winds, will likely overload the existing snowpack, which is fundamentally
weak due to the prolonged cold temperatures. People are keen to get out, and
have time to do so over the holiday period, but don't let your enthusiasm,
or that of your friends, carry you to places you'll regret later on. I
expect unstable conditions will persist for longer than people expect-we
could be entering an unusual and dangerous period for the next few weeks.
Play safe out there and get into the habit of making consistent, cautious
decisions.

--------------------------------------------------------------------------------

Travel Advisory   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
Fernie and the Lizard range could be primed for quite a significant
avalanche cycle if snow amounts come through in the 30-40cm range with high
winds on Saturday. If the storm arrives as predicted, the touchy conditions
will be ripe for both natural and human triggers. Select simple,
conservative terrain. Keep slope angles low and avoid steep open slopes, as
well as drops and rolls-now just isn't the right time. Be especially careful
at this time to avoid exposure to avalanche slopes from above, particularly
when grouping up.

Where snow amounts are less, there are still dangers to be aware of. The
complicated snowpack contains buried windslab on a variety of aspects and
elevations. This is sitting on a lower layer of weak facets/depth hoar.
These instabilities could easily wake up with only a small amount of
additional load. Therefore, the advice above about terrain selection, safe
travel techniques and the need for leaving extra margins of safety still
apply.

Avalanche Activity   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
Surface slabs are starting to react to human triggering. These slabs have
been releasing on top of the old faceted snow surface, and are running
surprisingly far. Below treeline, although cover is still sparse, I suspect
that this type of activity will intensify with the passage of the storm and
the likelihood for triggering an avalanche big enough to bury or kill a
person will increase.

Snowpack   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
Around Fernie, 20-30cm of new snow overlies hard windslab in exposed areas
and bottomless facets in sheltered areas. Higher up, there may still be
remnants of the early season crusts. Lower down, these have faceted out and
turned to depth hoar. Snowpack depths are creeping up and as the wind starts
to pick up, the surface slab will become denser and more reactive to
triggering.

Weather   Issued: Fri, Dec 26 Next Scheduled Update: Sat, Dec 27
15-25cm new snow expected on Saturday. Local amounts could be heavier. Very
strong W to SW winds. Temperatures warming to around -5C.

Sunday: Periods of light snow. Temperatures -5 to -10. Winds moderate to
strong SW.

Monday: 10-15cm further accumulation of new snow. Temperatures around -5C.
Winds from the west.

View Avalanche Observation Summary

Issued by:James Floyer

Important Notice: This is a regional forecast and significant variation may
exist within the forecast area. The information and danger ratings are
intended as a trip planning aid for recreational, backcountry users of
avalanche terrain; they are not meant to be used as the sole factor in
determining the avalanche danger presented by a specific slope. Always
include local weather, snowpack and avalanche observations in your decision
to travel in avalanche terrain. Observations and experience may lead to
different conclusions from what is reported or recommended. See disclaimer
for further details. The technical data used to produce these bulletins is
obtained from a variety of sources, including various government agencies
and private companies that participate in an industry-wide daily information
exchange program. These contributors provide data, resources, and funding
without which the Canadian Avalanche Centre could not provide this avalanche
information.
Avalanche information for other regions in western Canada is available
toll-free at 1-800-667-1105 or online at www.avalanche.ca