**Update** A Winter Weather Advisory is in effect for much of the D.C. area through tomorrow morning at 9am with up to an inch of snow possible in and around D.C. and 1 to 2 inches possible south and east of the city.
A weak "clipper" type system appears like it will bring the chance for a few flakes to the D.C. area tonight into Thursday morning. Yesterday I reported that there was the chance for up to a half inch of snow in the region. I still think this is fairly on the right track for the majority of the D.C. area, but there actually may be some pockets of heavier snow totaling up to an inch or two.
- GFS 500mb Vorticity plot
Above shows the GFS forecast 500mb vorticity plot tonight around midnight. Energy is expected to swing around the main upper trough and make it into our area during the overnight hours. This is what will help bring the chance for light or scattered snow showers. This is a fairly strong "vort max" and even though there is little moisture with the system snow showers still appear likely tonight.
You will definitely want to be careful driving to work Thursday morning. Temperatures will be cold enough tonight (Teens to low 20s) that the snow may just blow around a bit, but there could be an isolated slick spot. This should be the kind of snow that you can sweep off the steps or driveway with a broom rather than a shovel. Not great for snowballs!
Above is the precipitation forecast for tonight into tomorrow morning. This is a little different from the same time period yesterday with some banding possibly setting up south and east of D.C. This would be where the greatest snowfall totals will be possible, with the highest in the 1 to 2 inch range across Southern Maryland and the Northern Neck in Virginia. Stay tuned to ABC 7 News at 5pm, 6pm and 11pm for the latest updates as well as updates around the clock on NewsChannel 8.