Wind speeds

Wind speeds

Post by Timur Ta » Fri, 06 Apr 1990 00:38:05


Could someone explain the F- designation of wind speeds?  
 
 
 

Wind speeds

Post by Humuhumunukunukuapu » Fri, 06 Apr 1990 04:59:04

Quote:
>Could someone explain the F- designation of wind speeds?  

from my hood river county visitor's info card...
funny how these things are close at hand these days.

MPH     knots       beaufort    description
0-1     0-1         0           calm
1-3     1-3         1           light air
4-7     4-6         2           light breeze
8-12    7-10        3           gentle breeze
15-18   11-16       4           moderate breeze
19-24   17-21       5           fresh breeze
25-31   22-27       6           strong breeze
32-38   28-33       7           moderate gale
39-46   34-40       8           fresh gale
47-54   41-47       9           strong gale
56-63   48-55       10          whole gale
64-72   55-63       11          storm
73-136  64-118      12          hurricane
136+    118+        12+         typical Gorge day

well...almost.

    ~spass
--
spass otto stoiantschewsky                              "shred your head"
                        put this subject in your kill file

 
 
 

Wind speeds

Post by Juri Munk » Sun, 08 Apr 1990 00:21:03

Quote:

>>Could someone explain the F- designation of wind speeds?  

>from my hood river county visitor's info card...
>funny how these things are close at hand these days.

In Europe, meters/second is a popular unit for wind speed, so I added one
more column. These are not exact scientific figures, but they should give
you a good feeling of what 7 m/s really means.

m/s     MPH     knots  beaufort description
0       0-1     0-1     0       calm
1       1-3     1-3     1       light air
2       4-7     4-6     2       light breeze
4       8-12    7-10    3       gentle breeze
7       15-18   11-16   4       moderate breeze
10      19-24   17-21   5       fresh breeze
12      25-31   22-27   6       strong breeze
16      32-38   28-33   7       moderate gale
19      39-46   34-40   8       fresh gale
22      47-54   41-47   9       strong gale
27      56-63   48-55   10      whole gale
30      64-72   55-63   11      storm
32-61   73-136  64-118  12      hurricane
61      136+    118+    12+     typical Gorge day

My sails are 4.4, 5.6 and 7.0, so I prefer winds between 7 and 17 m/s.
I hope the 10-14 m/s winds we having been having will still exist in
the summer, but I seriously doubt we will be that lucky.

I'll be in San Francisco between April 10th and 17th and on Maui between
April 19th and May 2nd. If anyone wants to meet a windsurfer from Finland,
send me mail before Sunday. I'll try to find a place where I can telnet
to read my mail, but Monday morning might be my last chance to read mail
before May 4th.

P.S. I'm bringing my own wetsuit...

   ___________________________________________________________________________
  / Juri Munkki     /  Helsinki University of Technology   /  Wind  /   HP S /

 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 
 
 

Wind speeds

Post by b.. » Wed, 11 Apr 1990 04:23:01

Quote:

> 16 32-38   28-33   7       moderate gale
> 19 39-46   34-40   8       fresh gale
> 22 47-54   41-47   9       strong gale

does anybody remember the additional columns that were listed in
(i think) Alan Watts' "Wind and Small Boat Racing" (they were actually from
another source).  one was sea conditions (i.e. flat, ripples, waves,
few/many/spraying whitecaps) and the other was emotional (i.e. boredom/
pleasure/e***ment/e***ment tinged with fear/fear tinged with terror...)?



 
 
 

Wind speeds

Post by Linda Dra » Mon, 16 Apr 1990 07:50:50



Quote:

Munkki) writes:
>> 16   32-38    28-33   7      moderate gale
>> 19   39-46    34-40   8      fresh gale
>> 22   47-54    41-47   9      strong gale

>does anybody remember the additional columns that were listed in
>(i think) Alan Watts' "Wind and Small Boat Racing" (they were actually from
>another source).  one was sea conditions (i.e. flat, ripples, waves,
>few/many/spraying whitecaps) and the other was emotional (i.e. boredom/
>pleasure/e***ment/e***ment tinged with fear/fear tinged with terror...)?

I can contribute half of the information (quoted from Major Hall's _Sports
Illustrated Boardsailing_):

Beaufort
(Force)  MPH  Knots   Name           Appearance of land and water
Number

   0    < 1   < 1   Calm            Smoke rises vertically; water calm,
                                    mirrorlike
   1    1-3   1-3   Light air       Wind direction shown by smoke but not by
                                    weathervanes; ripples on water
   2    4-7   4-6   Light breeze    Leaves rustle; wind felt on face;
                                    weathervanes moved by wind; small wavelets
                                    on water
   3   8-12  7-10   Gentle breeze   Leaves and twigs in constant motion; wind
                                    causes flags to flutter; large wavelets,
                                    scattered whitecaps on water
   4   13-18 11-16  Moderate breeze Wind raises dust and loose paper; small
                                    branches are moved; small waves, many
                                    whitecaps on water
   5   19-24 17-21  Fresh breeze    Small leafed trees begin to sway; moderate
                                    waves, whitecaps, small spray on water
   6   25-31 22-27  Strong breeze   Large branches in motion; phone lines
                                    whistle; umbrellas used with difficulty;
                                    large waves, whitecaps everywhere, spray
                                    on water
   7   32-38 28-33  Moderate gale   Whole trees in motion; difficult to walk
                                    against wind; sea heaps, white foam blows
                                    in streaks
   8   39-46 34-40  Fresh gale      Wind breaks twigs off trees; walking
                                    impeded; waves long with well-marked white
                                    streaks on surface
   9   47-54 41-47  Strong gale     Slight structural damage to buildings
                                    occurs; shingles torn off roofs; high
                                    waves, rolling seas, streaks everywhere,
                                    reduced visibility due to heavy spray
  10   55-63 48-55  Whole gale      Trees uprooted; considerable structural
                                    damage to buildings; extremely high waves
                                    with overhanging crests; reduced
                                    visibility
  11   64-72 56-64  Storm           Widespread damage; find secure shelter!
 12-17  --    --    Hurricane       Devastation


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