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Wind Speed Rating, Log Book Scale

Value	Name	MPH	Description
00	Calm	< 1	Calm, smokes rise vertically
01	Very light	1 - 3	Wind direction shown by smoke, not vanes
02	Light	4 - 7	Wind felt on face, leaves rustle, vane moves
03	Gentle	8 - 12	Leaves, twigs moving, wind extends flag
04	Moderate	13 - 18	Dust, loose paper raised, small branches move
05	Fresh	19 - 24	Small leaved trees sway, wave crests on inland waters
06	Strong	25 - 38	Large branches move, overhead wires whistle
07	Gale	39 - 54	Whole trees sway, walking against wind hard
08	Whole gale	55 - 72	Twigs break off trees, cars hard to steer
09	Hurricane	> 72	Widespread damage

72 mph or greater is defined as a hurricane.

The Log Book Scale was widely used by maritimers before the Beaufort Scale was adopted.