Thursday Morning 1/24 High pressure will slide off the coast this afternoon as a sharp upper level trof digs across the Mid West. A strong vorticity maximum will dive through the base of this trof as it moves through here Overnight. My rule of thumb for precipitation in these types of events is: If the center of the vort max moves South of DC, then we have a chance...if it goes North, we stay dry. This one will move across Northern VA, so I think we'll have a chance for some light snow or snow showers. Most of the models actually develop a surface low This Evening as well, but too far off shore for us to get into the heavier snow. The upper level trof stays "positive"...we need it to tilt back...or go "negative"...for us to have a chance at a good snowstorm. As it stands right now, I think there is still a chance at some minor accumulations. Quiet and cold conditions expected on Friday.  ¶ 6:53 AM