Beaufort scale
Divisions of wind speed from Force 0 (calm) to Force 12 (Hurricane) with a visual description of the corresponding sea state- summarised below:F0 Calm 0kts Smoke rises vertically, sea as a mirror F1 Light air 1-3kts Smoke moves, glassy seaF2 Light breeze 4-6kts Rippled sea, windvanes move F3 Gentle breeze 7-10kts Wavelets, light flags are extended F4 Mod. breeze 11-16kts Small waves, some white horses F5 Mod. breeze 17-21kts Mod. waves, many white horses F6 Strong wind 22-27kts Large waves, foam, sprayF7 Near gale 28-33kts Sea heaps up, blown foam streaks F8 Gale 34-40kts Mod. high waves, foam & spindrift F9 Strong Gale 41-48kts High waves, toppling crestsF10 Storm 48-55kts V. high overhanging white wavesF11 Storm 55-63kts Exceptionally high waves, sea of froth F12 Hurricane >64kts Sea and air undistinguishable
Source: http://www.splashmaritime.com.au/Marops/Dictionary.pdf
Web site to visit: http://www.splashmaritime.com.au/
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