You can see the Northern cold front dipping down at the Dakotas, probably in unison with the jet stream trough. In the Appalachian area that cold front is bringing cold air from the North and mixing with Maritime Tropical air which drops the capacity for moisture in that warm moist air mass. The result we can see is a huge storm.
You can see in this upper air data the trough over the Dakotas. However, the wind direction suggests that hot dry Continental Tropical air should be moving into the Appalachian range. The Low pressure system might then draw moisture in from the Gulf of Mexico but there shouldn't be any cold air to force massive precipitation unless it is a very powerful Low causing unstable atmospheric conditions.
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