at mid flame heightīEAUFORT SCALE FOR ESTIMATING 20-FT WIND SPEEDģ9mph: Fresh gale – surfaced strong Santa Ana intense stress on all exposed objects, vegetation, buildings canopy offers virtually no protection wind flow is systematic in disturbing everything in its path. at midflame heightĭownslope winds – 3 to 6 mi/hr. Up-valley wind – 10 to 15 mi/hr., early afternoon and evening at 20 ft. The units of measurement of wind used in the UK are km/h or m/s for its speed, and knots (1 knot 1.852 km/h) which are mainly used by sailors and pilots. Land breeze – 2 to 3 hours after sunset, 3 to 5 mi/hr. Wind measurement is composed of two complementary parameters: its speed (or force) and its direction.
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