wind sock

fabric sleeve that moves in the wind and is used to indicate wind direction, wind indicator used at airports to determine airplane landing instructions depending on wind direction

A windsock or wind cone is a conical textile tube designed to indicate wind direction and relative wind speed. Windsocks typically are used at airports and in chemical plants in which there is risk of gaseous leakage. They are sometimes located alongside highways at windy locations.Wind direction is the opposite of the direction in which the windsock is pointing (note that wind directions are conventionally specified as being the compass point from which the wind originates; so a windsock pointing due north indicates a southerly wind). Windspeed is indicated by the windsock's angle relative to the mounting pole; in low winds, the windsock droops; in high winds it flies horizontally. Per FAA standards referenced below, a 15 knot (17mph) wind will fully extend the windsock. A 3 knot (3.5mph) breeze will cause the windsock to orient itself according to the wind.
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Noun
1. truncated cloth cone used to indicate wind direction
(synonym) air sock, air sleeve, wind sleeve
(hypernym) indicator

Synonyms and related words:
anemograph, anemometer, anemometrograph, anemoscope, beacon, beam, cock, fan marker, flare path, marker, pylon, racon, radar beacon, radio beacon, vane, weather vane, weathercock, wind cone, wind indicator, wind vane, wind-speed indicator
  

wind-sock
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