The occluded front extended from Lake Huron to Pennsylvania on September 13.
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Occluded fronts usually form around mature low pressure areas.
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Precipitation may last for several days, depending on the speed of the warm or occluded front it accompanies.
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An occluded front is formed during the process of cyclogenesis when a cold front overtakes a warm front.
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Altostratus tends to form ahead of a warm or occluded front, the altostratus gradually thickening into rain bearing nimbostratus.
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On November 13, an extratropical disturbance developed just off the shore of southern Oregon, at the end of an occluded front.
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Occluded fronts are indicated on a weather map by a purple line with alternating half-circles and triangles pointing in direction of travel.
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Occluded fronts form late in the cyclone life cycle near the center of the cyclone and often wrap around the storm center.
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They also can occur under altostratus cloud preceding a warm or occluded front, when cumulus usually lose vertical development as the sun's heat decreases.
10.
Schultz, D . M ., and G . Vaughan, 2011 : Occluded fronts and the occlusion process : A fresh look at conventional wisdom.
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