A potent winter storm is heading for the northeast, but the same system will move through the D.C. Metro before intensifying off the east coast tomorrow evening. A Winter Weather Advisory is in effect for areas west of the D.C. Metro including Loudoun and Fauquier Counties in Virginia and Frederick County in Maryland and points to the west. Below is a graphical look at the current advisories posted for the D.C. Metro.
So what should you expect when you wake up tomorrow morning? As far as the D.C. Metro and points east, rain will be the likely form of precipitation with up to a quarter of an inch or more of precipitation along and east of I-95. The heaviest rainfall totals will fall over the Eastern Shore with up to 3 inches possible along the coast.
Farther north and west, in the advisory area, temperatures will be close enough to freezing where sleet, freezing rain, and some wet snow will be possible very early tomorrow morning. Accumulations will be little to none, but it could cause a few slick spots for the Friday morning commute. After about 8am, temperatures in the northwest suburbs should climb above freezing and a transition to a chilly rain will occur. Here's one simulation of temperatures tomorrow morning at 3am.
- 18z HighRes NAM
As the coastal low intensifies off the New England coast late tomorrow night, colder air will filter in and north winds will pick up. It will feel like winter! Also, some wrap around snow bands will move through late tomorrow afternoon and evening, but little to no snow accumulation is expected. The image below shows snowfall totals through 4am Saturday with a tenth of an inch of snow predicted over D.C. and slightly higher amounts north of Washington. The highest snowfall totals, as usual in this area, will occur over the high spots
The confidence with this forecast is fairly high. New England will certainly get the brunt of this storm and it will go in the history books, for sure.