wind vane"An instrument used to indicate or measure wind direction. It consists basically of an asymmetrical, elongated object mounted at its center of gravity about a vertical axis.
wind vane
Any instrument designed primarily to measure wind direction .
wind velocity ...
Wind Vane - an instrument used to indicate wind direction
Windward Side - the side of an object facing the direction from which the wind is blowing ...
WIND VANE
An instrument that indicates the wind direction. The end of the vane which offers the greatest resistance to the motion of the air moves to the downwind position.
Wind Vane An instrument that determines the direction from which a wind is blowing.
wind vane: instrument used to measure wind direction.
zephyr any soft, gentle breeze.
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Wind Vane An instrument used to determine wind direction.
Windsock A large, conical, open bag designed to indicate wind direction and relative speed; usually used at small airports.
Wind Vane An instrument used to indicate wind direction.
Wind Vector Arrow representing wind velocity. The arrow points in the direction of the wind. The length of the arrow is proportional to wind speed.
Wind Vane...The wind direction can be determined from the flow of smoke, or a flag, or even the unscientific method, wet finger? The wind vane can be easily made from tin, wood, or other material.
WIND VANE - Weather instrument for measuring the direction of the wind.
WSR-77D - Conventional, non-doppler radar developed and adopted by most weather service firms during the 1970's. Provides only reflectivity products.
Damping ratio A constant which describes the performance of a wind vane in response to a step change in wind direction. It is calculated from the relative amount of overshoot on two successive swings (half cycles) of a decaying oscillation.
WEATHER VANE Originally used as a wind vane, it is an instrument that indicates the wind direction. The name developed based on observations on what kind of weather occurred with certain wind directions.
aerovaneA device that resembles a wind vane with a propeller at one end. It is used to indicate wind speed and direction.air densityThe mass per unit volume of air; about 1.275 kilometer per cubic meter at 0° C and 1000 millibars.
The anemometer and wind vane should be placed in plane, open surroundings at a standard height. I cannot find specifications in the references available to me, but no doubt such standards exist, especially for reporting surface winds at airports.
In the history of weather recording, these are the most common structures for mounting wind vanes (sometimes called weathervanes).
The simplest type of this form consists of a flat plate, which is usually square or circular, while a wind vane keeps this exposed normally to the wind, and the pressure of the wind on its face is balanced by a spring.
Dines anemometer"A type of pressure-tube anemometer, named after the inventor, in which the pressure head is located on the windward end of the wind vane so that it is kept facing into the wind.
March 2001: Wind Vanes: Pointing To The Wind
April 2001: From Sea Froth To Raindrops
May 2001: Another Fine Vintage
June 2001: Winds of the Day
July 2001: Hot Town: Summer in the City
August 2001: Aeroallergens: Misery Blowin' In The Wind ...
Light Breeze: Wind felt on face; leaves rustle; wind vanes moved by wind; small wavelets form on water, still short, but more pronounced; crests have glassy appearance.
34-40 ...
Smoke drift shows wind direction, wind vanes don't move.
2
Light Breeze ...
Surface winds are measured by anemometer and wind vane; winds aloft by such systems as pilot balloon, radiosonde, or aircraft navigational techniques.
Beaufort Force 1 - Wind 1-3 kt, Light Air, Scaly ripples, no foam crests. Smoke drift indicates wind direction, still wind vanes.
(Corona Discharge) A more or less continuous luminous electrical discharge of weak or moderate intensity in the atmosphere, emanating from elevated objects at the Earth's surface (lightning conductors, wind vanes, masts of ships) or from aircraft in ...
An example: For an obstruction of some 15 m in height (a typical large building), which is about 75 m from the site of the intended anemometer site, then the wind vane/cups would need to be about 25 m above ground level.
 See also: Wind, Weather, Air, Horizon, Temperature
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