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A weather vane, also called a wind vane, is a movable device attached to an elevated object such as a roof for showing the direction of the wind. Very often these are in the shape of cockerels and are called weather cocks. Arrows are also popular, but a multitude of designs have been used. Image File history File links Download high resolution version (2048x1536, 155 KB) Beschreibung: Windrichtungsgeber Source: german wikipedia, original upload 19. ...
Image File history File links Download high resolution version (2048x1536, 155 KB) Beschreibung: Windrichtungsgeber Source: german wikipedia, original upload 19. ...
Image File history File links Download high resolution version (1754x2646, 2231 KB) Rooster Weather Vane photographer: Arne Koehler File links The following pages link to this file: Weather vane ...
Image File history File links Download high resolution version (1754x2646, 2231 KB) Rooster Weather Vane photographer: Arne Koehler File links The following pages link to this file: Weather vane ...
Image File history File links Download high resolution version (1824x1208, 989 KB) Description: Project Vortex mesonet vehicle aerovane for wind speed and direction. ...
Image File history File links Download high resolution version (1824x1208, 989 KB) Description: Project Vortex mesonet vehicle aerovane for wind speed and direction. ...
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The weather vane must be balanced so that half its weight is on either side of its axis, but also designed so that the momenta about the axis of the areas exposed to the wind are unequal. This unequal moment causes the vane to rotate to minimize the force of the wind on its surface. The design of the vane causes the end with the smallest moment to turn into the wind, pointing to the source of the wind. Because winds are named from their source direction, the pointer enables the viewer to name the wind easily. Most simple weather vanes have directional markers beneath the pointer, aligned with the geographic directions. The pointer must be able to move freely on its axis.
Weather cocks, especially those with fanciful shapes, do not always show the real direction of a very gentle wind. This is because the figures do not achieve the design balance required in a weather vane: an unequal surface area but balanced in weight.
Early weather vanes had very ornamental pointers, but modern wind vanes are usually simple arrows that dispense with the directionals because the instrument is connected to a remote reading station. Also modern wind vanes are mounted with an anemometer, a device that measures wind speed. Co-locating both instruments allows them to use the same axis (a vertical rod). Weather stations of variable quality may be purchased, and these include wind vanes along with several other instruments with dials that can be read comfortably inside a home or office. Combining a propeller for wind speed and a tail for wind direction on the same axis is an aerovane, for accurate, precise measurements from a single instrument. An anemometer is a device for measuring the velocity or the pressure of the wind, and is one instrument used in a weather station. ...
A technician examines a weather stations anemometer. ...
To meet Wikipedias quality standards, this article or section may require cleanup. ...
An anemometer is a device for measuring the velocity or the pressure of the wind, and is one instrument used in a weather station. ...
To obtain an accurate reading, the weather vane must be located well above the ground and away from buildings, trees, and other objects which interfere with the true wind direction. Changing wind direction can be meaningful when coordinated with other apparent sky conditions, enabling the user to make simple short range forecasts.
Another wind direction device is the windsock used at airports to show wind direction and strength. The wind fills the sock and makes it blow away from the prevailing wind. Strong winds make the sock point almost horizontally, while light airs allow the sock to hang limply. Because of its size, the windsock can often be seen from the air as well as the ground. Even the most technologically-advanced airports still use windsocks. A windsock is a large, conical, open-ended tube designed to indicate wind direction and relative wind speed. ...
External links
- Homemade electronic wind vane
| Meteorological instrumentation and equipment (Earth based) | | Anemometer | Barograph | Barometer | Ceiling balloon | Ceiling projector | Ceilometer | Dark adaptor goggles | Disdrometer | Field mill | Hygrometer | Ice Accretion Indicator | LIDAR | Lightning detector | Nephelometer | Nephoscope | Pyranometer | Radiosonde | Rain gauge | Snow gauge | SODAR | Solarimeter | Sounding rocket | Stevenson screen | Sunshine recorders | Thermograph | Thermometer | Weather balloon | Weather radar | Weather vane | Windsock | Wind profiler Image File history File links Commons-logo. ...
Wikimedia Commons logo by Reid Beels The Wikimedia Commons (also called Commons or Wikicommons) is a repository of free content images, sound and other multimedia files. ...
Satellite image of Hurricane Hugo with a polar low visible at the top of the image. ...
An anemometer is a device for measuring the velocity or the pressure of the wind, and is one instrument used in a weather station. ...
A barograph is a recording aneroid barometer. ...
A barometer is an instrument used to measure atmospheric pressure. ...
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Ceiling projector interior. ...
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This article or section does not adequately cite its references or sources. ...
Lightning detector at the Kennedy Space Center in Florida. ...
A nephelometer is an instrument for measuring suspended particulates in a liquid. ...
Nephoscope is instrument for measuring the altitude, direction, and velocity of movement of clouds. ...
A pyranometer is a type of actinometer used to measure broadband solar irradiance on a planar surface. ...
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Snow Gauge A snow gauge is a meteorological instrument used to record the depth of snowfall at a specific location. ...
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A solarimeter is a pyranometer used to measure combined direct and diffuse solar radiation. ...
A sounding rocket, sometimes called an elevator research rocket, is an instrument-carrying suborbital rocket designed to take measurements and perform scientific experiments during its flight. ...
Exterior of a Stevenson screen Interior of a Stevenson screen A Stevenson screen is a meteorological screen to shield instruments against precipitation and direct heat radiation from outside sources, while still allowing air to circulate freely around them. ...
Sunshine Recorders are used to indicate the amount of sunshine at a given location. ...
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Rawinsonde weather balloon just after launch. ...
To meet Wikipedias quality standards, this article or section may require cleanup. ...
A windsock is a large, conical, open-ended tube designed to indicate wind direction and relative wind speed. ...
A wind profiler is a piece of weather observing equipment that uses sound waves to detect the wind speed and direction at various elevations above the ground. ...
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