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The trade winds (also called trades) are the prevailing pattern of easterly surface winds found in the tropics near the Earth's equator, [4] equatorward of the subtropical ridge. These winds blow predominantly from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere. [5]
The westerlies, anti-trades, [2] or prevailing westerlies, are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees latitude. They originate from the high-pressure areas in the horse latitudes (about 30 degrees) and trend towards the poles and steer extratropical cyclones in this general manner. [ 3 ]
The Santa Anas are katabatic winds (Greek for "flowing downhill") arising in higher altitudes and blowing down towards sea level. [7] The National Weather Service defines Santa Ana winds as "a weather condition [in southern California] in which strong, hot, dust-bearing winds descend to the Pacific Coast around Los Angeles from inland desert regions".
The Santa Ana winds form in a western area of the country known as the Great Basin, which includes Nevada and part of Utah. The basin sits at a higher elevation than Southern California.
They begin when winds from the desert flow westward toward an area of low pressure, near the coast, like L.A. The winds usually originate in the Great Basin of the United States between September ...
Few residents in the San Gabriel Valley will forget the events of late November and early December 2011, when winds cut off power to 400,000 residents, downed thousands of trees and damaged more ...
The Atacama Desert in Chile is the driest non-polar desert on Earth because it is blocked from moisture by the Andes Mountains to the east while the Humboldt Current causes persistent atmospheric stability. Cuyo and Eastern Patagonia is rain shadowed from the prevailing westerly winds by the Andes range and is arid.
Wildfires began breaking out in Southern California Tuesday morning as a life-threatening, widespread windstorm that could be one of the most destructive to hit the region in over a decade roars ...