Physics

18 February, 20:12

Wind speed is rounded off to the nearest 5 knots and is symbolized by "feathers" drawn on the clockwise side of the wind-direction shaft. A full feather represents 10 knots (11.5 mph) and half feathers indicate 5 knots. A pennant indicates 50 knots and a circle drawn around the station circle signifies calm conditions. In this case, the reported wind speed is

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