Sunday, August 05, 2012

Heavy Rainfall Threat Looms With Some Storms

Tropical humidity fueled by temperatures in the lower and middle 90's across the Delaware Valley and dew points that are above 70 in much of the region, will lead to continued thunderstorm development as we work through the duration of the afternoon hours.  Current radar (as of 1:30 PM) shows a scattering of storms across Pennsylvania -- a batch over the Poconos is moving into New Jersey, a broken line of storms is firing across the Appalachians in Central PA and will be lifting northeast and east over the next several hours.

While there could be a few severe thunderstorms later on, the bigger threat for severe weather resides to our northwest.  Isolated damaging winds are possible in stronger storms through the course of the afternoon but the bigger issue will be heavy rainfall as storms continue to develop out ahead of the front over the afternoon and evening hours.  Those storms will gradually shift eastward, reaching Philadelphia this evening and tonight.

Given the tropical moisture in place, the potential for localized one to two inch rainfall amounts exists around the region, perhaps more in a few spots up to our north and northwest. This could result in localized flooding, ponding of water on roadways, and the usual suspect smaller streams getting close to flood stage up in the Poconos (where a Flash Flood Watch is out). The rainfall threat will gradually taper off tonight as the front crosses the region but it may not be until early tomorrow morning.

We'll continue to update you through the afternoon & evening on storm development and track.

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