Subsiding, diverging, dry air masses associated with subtropical high-pressure systems are extremely unfavorable for the development of convectional showers.
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In the Northern Hemisphere summer the Subtropical high pressure systems move northward and closer to the United States mainland.
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This is due to the continental interior location on the leeward side of mountains, with constant subtropical high pressures.
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They commonly occur in the eastern sections of subtropical high pressure regions or in the southeastern quadrant of polar highs.
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About 75 percent of South Florida's annual rain falls from May to October, when an Atlantic subtropical high-pressure zone delivers humid air.
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The storm's long life is attributed to its position near the center of a subtropical high, where steering winds are light and variable.
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In the summer months, the southerly flow from subtropical high pressure ( the Atlantic / Bermuda High ) often creates hot and humid weather.
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The surface air that flows from these subtropical high-pressure belts toward the Equator is deflected toward the west in both hemispheres by the Coriolis effect.
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In contrast, Florida lies on the western flank of the Atlantic subtropical high, where a large zone of ascent occurs, causing sea breeze storms to flourish.
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In the summer months, the southern part of the continent straddles the westerly wind belt to the south and the subtropical high pressure ridge to the north.