December 9-10 Winter Storm

Probably one of the more harder preliminary maps that I have ever had to made for an event. This one took quite a while to make..

Low pressure is currently developing over the SW and that low pressure should continue to move off to the east and eventually turn to the NNE. By wednesday 6 Z this low pressure should be over Southern illinois. Meanwhile another area of low pressure will be riding up the eastern seaboard.

WAA will break out well in advance of this dual low pressure scenario and spread a variety of weather into the region. Anchored to the north of this system will be a high pressure in the range of 1028-1030 mbs and this will provide colder air to anchor in and take hold for awhile. Cold air Damming will effect areas from PA north..however at this point I am not sure if the CAD will be strong enough to reach south of PA. This high pressure will start to lift off to the North and East and as it does so should change precipitation over to all rain in the red zone during the morning on wednesday. The only exception to this will be in the red zone from VT ENE into Maine where it could potentially stay all frozen..

With that all said , before this does changeover to rain its generally going to make the morning rush hour a mess in majority of the NE from PA north.
Again this is preliminary...

Areas not completely sure about are south of PA into western MD..So for those in that area take that part of the map with a grain of salt...