Sunday, December 13, 2009

Dec 13-14th Final Call


Weak low pressure is down along the Tx/ LA border. This low pressure is not very organized nor very strong. The precipitation is out ahead of the low. Commonly called as over running. This over running is essentially being caused by WAA. As this moisture over runs the area majority of the region is at or below freezing and in some cases well below freezing. Currently high pressure is sitting along the east coast which is going to produce a wind out of the south. This WAA is going to cause the 850s to lift above freezing . However for a period of time which i will specify as unknown..the surface will remain below freezing. It just all depends on two things. Surface temperature & how long the CAD can stay in place
The area in Red is primarily going to be ZR and sleet but could start off as a period of snow that could leave a T-1 of show. Further into NE PA potential for an inch or two of snow but even there should end up changing to sleet/ZR..Eventually all areas should change to rain that are in the red zone.

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