A Pinwheel-like Pattern Of High
Photograph - Photograph
A pinwheel-like pattern of high pressure clouds stretches across the eastern United States. The circular pattern to the clouds, stretching from Ohio to Florida and from Arkansas to the Atlantic Coast, was caused by the flow of air around a sprawling high-pressure ridge centered in western Virginia, North Carolina, and eastern Tennessee. In meteorology, high pressure ridges form where air is sinking from high altitudes toward Earth's surface. The descending air flows out from the center in clockwise spirals in the northern hemisphere and counter-clockwise in the southern hemisphere.
December 7th, 2011
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