Meteorological Conversions and Calculations

The Beaufort Wind Scale

WPC HEAT INDEX FORECASTS

Force	Name	Wind Speed knots mph		Consequence
0	Calm	0	0	Smoke rises vertically
Wave height: 0 m - Sea: Like a mirror
1	Light air	1-3	1-3	Smoke drifts with air
Wave height: 0.1 m (.25 ft) - Sea: Ripples - No foam crests
2	Light breeze	4-6	4-7	Weather vanes become active
Wave height: 0.2-0.3 m (0.5-1 ft) - Sea: Small wavelets - Not breaking
3	Gentle breeze	7-10	8-12	Leaves and small twigs move
Wave height: 0.6-1 m (2-3 ft) - Sea: Small wavelets - Crests begin to break
4	Moderate breeze	11-16	13-18	Small branches sway
Wave height: 1-1.5 m - Sea: Small waves becoming longer, numerous whitecaps.
5	Fresh breeze	17-21	19-24	Small trees sway - Waves break
Wave height: 2-2.5 m (6-8 ft) - Sea: Moderate waves - Many whitecaps
6	Strong breeze	22-27	25-31	Large branches sway
Wave height: 3-4 m (9.5-13 ft) - Sea: Larger waves forming - Whitecaps everywhere
7	Moderate gale	28-33	32-38	Whole trees sway - difficult to walk
Wave height: 4-5.5 m (13.5-19 ft) - Sea: Sea heaps up - White foam blown around
8	Fresh gale	34-40	39-46	Twigs break off trees
Wave height: 5.5-7.5 m (18-25 ft) - Sea: Edges of crests break into spindrifts
9	Strong gale	41-47	47-54	Shingles blow off roofs
Wave height: 7-10 m (23-32 ft) - Sea: High waves - Sea rolls - Reduced visibility
10	Whole gale	48-55	55-63	Trees uprooted - Damage to buildings
Wave height: 9-12.5 m (29-41 ft) - Sea: Very high waves with overhanging crests
11	Storm	56-63	64-73	Widespread damage
Wave height: 11.5-16 m (37-52 ft) - Sea: Exceptionally high waves
12	Hurricane	Over 63	Over 73	Violent destruction
Wave height: 16+ m (52+ ft) - Sea: Sea completely white - Excessive foam

Wind Speed Converter

More Meteorological Conversions and Calculations
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