Module 1 Module 1: Student Sheet 4 Beaufort Wind Scale Student Name: _________________________________
Beaufort Force
0 1
2 3 4 5 6 7 8 9 10 11 12
Wind Speed (MPH)
0-1 1-3
4-7 8-12 13-18 19-24 25-31 32-38 39-46 47-54 55-63 64-72
73 or more
Date: __________________ Sea Indicators
Sea surface smooth and mirror-like Scaly ripples, no foam crests
Small wavelets, crests glassy, no breaking
Large wavelets, crests begin to break, scattered whitecaps
Small waves 1-4 ft. becoming longer, numerous whitecaps
Moderate waves 4-8 ft taking longer form, many whitecaps, some spray
Larger waves 8-13 ft, whitecaps common, more spray
Sea heaps up, waves 13-19 ft, white foam streaks off breakers
Moderately high (18-25 ft) waves of greater length, edges of crests begin to break into spindrift, foam blown in streaks
High waves (23-32 ft), sea begins to roll, dense streaks of foam, spray may reduce visibility
Very high waves (29-41 ft) with overhanging crests, sea white with densely blown foam, heavy rolling, lowered visibility
Exceptionally high (37-52 ft) waves, foam patches cover sea, visibility more reduced
Air filled with foam, waves over 45 ft, sea completely white with driving spray, visibility greatly reduced
Classification Calm
Light Air Light Breeze Gentle Breeze
Moderate Breeze
Fresh Breeze
Strong Breeze
Near Gale Gale Strong Gale Storm Violent Storm Hurricane WMO
27
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