Monday, 20 October 2014

The Beaufont Scale

                       Storms forecast tonight in the U.K. with gusts up to 56 MPH
                                         http://en.wikipedia.org/wiki/Beaufort_scale
               
                   For all the Pirates out there multiply mph by  0.86897624190816 to get knots
                                     IE 56 mph to knots  56 X 0.86897624190816  =  48.66 knots
                        If you are a landlubber multiply knots by 1.1507794480136 to get mph


Beaufort Scale

Beaufort 1-min Wind speed Effects on land
0
Calm
0 - 1 mph Calm. Smoke rises vertically.
1
Light air
1 - 3 mph Smoke drift indicates wind direction and wind vanes cease moving.
2
Light breeze
3 - 7 mph Wind felt on exposed skin. Leaves rustle and wind vanes begin to move.
3
Gentle breeze
7 - 12 mph Leaves and small twigs constantly moving, light flags extended.
4
Moderate breeze
12 - 17 mph Dust and loose paper raised. Small branches begin to move.
5
Fresh breeze
17 - 24 mph Branches of a moderate size move. Small trees in leaf begin to sway.
6
Strong breeze
24 - 30 mph Large branches in motion. Whistling heard in overhead wires. Umbrella use becomes difficult. Empty plastic bins tip over.
7
Near gale
30 - 38 mph Whole trees in motion. Effort needed to walk against the wind.
8
Gale
38 - 46 mph Some twigs broken from trees. Cars veer on road. Progress on foot is seriously impeded.
9
Severe gale
46 - 54 mph Some branches break off trees, and some small trees blow over. Construction/temporary signs and barricades blow over.
10
Storm
54 - 63 mph Trees are broken off or uprooted, saplings bent and deformed. Poorly attached asphalt shingles and shingles in poor condition peel off roofs.
11
Violent storm
63 - 73 mph Widespread damage to vegetation. Many roofing surfaces are damaged; asphalt tiles that have curled up and/or fractured due to age may break away completely.
12
Hurricane
73 - 99 mph Very widespread damage to vegetation. Some windows may break; mobile homes and poorly constructed sheds and barns are damaged. Debris may be hurled about.