Posts Tagged "wind"

Cyclonic Storm

Posted by on Sep 16, 2011 in phenomena | 5 comments

Cyclonic Storm

In meteorology, a cyclone is an area of closed, circular fluid motion rotating in the same direction as the Earth. This is usually characterized by inward spiraling winds that rotate counter clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere of the Earth. Most large-scale cyclonic circulations are centered on areas of low atmospheric pressure. The largest low-pressure systems are cold-core polar cyclones and extratropical cyclones which lie on the synoptic scale. Warm-core cyclones such as tropical cyclones, mesocyclones, and polar lows lie within the smaller mesoscale. Subtropical cyclones are of intermediate size. Upper level cyclones can exist without the presence of a surface low, and can pinch off from the base of the Tropical Upper Tropospheric Trough during the summer months in the Northern Hemisphere. Cyclones have also been seen on extraterrestrial planets, such as Mars and Neptune.

{Wikipedia}

related mobileGRIB variables: Pressure, Wind

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7 Beaufort wind

Posted by on May 11, 2011 in phenomena | 3 comments

7 Beaufort wind

Finistere, Bretagne, France.

The Beaufort Scale ( /ˈboʊfərt/) is an empirical measure for describing wind speed based mainly on observed sea conditions (on land it is categorised by the physical effects it has on vegetation and structures). Its full name is the Beaufort Wind Force Scale.

{Wikipedia, picture of Jérémie Janisson}

 

related mobileGRIB variable: Wind arrows

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