quick update on tonight's snow.

A fast moving very strong upper level disturbance will move through the region after sunset tonight. Upper level dynamics and thermodynamics suggest enough lift to cause moderate and even heavy at times precip in a relatively small south to north band of about 50 miles somewhere near the US 64 corridor. 2-4 inches of snow will be possible w/n this relatively thin band of heavy precip. This is an extremely rare event for this type of system therefore past climate data is virtually non existent. The big question is exactly where does this band of heavier precip set up and will there be any rain mixed in. Ground temps are also an issue right now, which normally you'd expect about an inch of snow wasted to cool the ground. Also, if the precip arrives before sunset, boundary layer conditions would likely mean more rain at the start. Will update more after lunch time on this one.