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October 1, 2010 / Dave Gorham

Latest on Current East Coast Flash Flooding Event

[Thanks to guest blogger Sr. Meteorologist Fred Schmude for this update!]

Some of the heaviest rain seen in several years has fallen across a large part of the Eastern Seaboard during the past 4 days as a deep layer of tropical moisture combined with a slow moving cold front and several weak low pressure areas.  To make matters worse, moisture associated with the remnants of Tropical Storm Nicole fed northward from eastern North Carolina through New England resulting in a second burst of heavy rain from the 30th of September into today.

Rainfall accumulations have generally averaged from 4 to 8 inches with isolated amounts up to 12 inches from eastern North Carolina through western New England.   By far the heaviest rainfall has fallen from extreme eastern North Carolina, northward across eastern Virginia, eastern Maryland, Delaware, eastern Pennsylvania, northern New Jersey, eastern New York State and most of New Hampshire where rainfall accumulations have averaged from 8 to 12 inches with isolated amounts up to an incredible 20 inches.  Due to the extreme nature of the heavy rainfall, widespread flooding has occurred in some of the major metropolitan areas of the Northeast, including Washington D.C. and Philadelphia where high water rescues have taken place.

The good news to report now is that most of the heavy rainfall has moved out of the area as drier air moves over the region behind a departing cold front.  There will be a small area of concentrated heavy rainfall over Maine this afternoon and evening where we may see several inches of rainfall before midnight.   Even there, rainfall will end by early tomorrow morning followed by several days of more tranquil weather.  There will be another weak weather system developing just off the North Carolina Coast on Sunday, which may bring some light rain and heavy showers to the eastern Carolinas and Virginia, but nothing of the scope that we’ve seen over the past several days.

Read more about some of this year’s torrential flooding here and here.

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