Beaufort Wind Scale – Reference for “Thoughts on Round the Rock and Wind”

This is a good reference to use when describing wind strengths.     This much abbreviated list of the Beaufort Scale stops at the point where upwind progress on a SUP becomes problematic.   The entire Scale goes to Force 12 which is Hurricane Force with sustained winds of 65+ knots or ?75mph.

Force

Wind
(Knots)

WMO
Classification

Appearance of Wind Effects

On the Water

On Land

0

Less than 1 Calm Sea surface smooth and   mirror-like Calm, smoke rises vertically

1

1-3 Light Air Scaly ripples, no foam crests Smoke drift indicates wind   direction, still wind vanes

2

4-6 Light Breeze Small wavelets, crests glassy,   no breaking Wind felt on face, leaves   rustle, vanes begin to move

3

7-10 Gentle Breeze Large wavelets, crests begin   to break, scattered whitecaps Leaves and small twigs constantly   moving, light flags extended

4

11-16 Moderate Breeze Small waves 1-4 ft. becoming   longer, numerous whitecaps Dust, leaves, and loose paper   lifted, small tree branches move

5

17-21 Fresh Breeze Moderate waves 4-8 ft taking   longer form, many whitecaps, some spray Small trees in leaf begin to   sway

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