Tonight and Tomorrow:
A small 30 or 40 percent chance of showers will persist through the night a developing low pressure system throws a warm front our way. By early afternoon, the said warm front should have pushed north of the region, conveniently placing us in the warm sector, as winds swing around to the southwest, and draw warm, tropical air into the Mid Atlantic. High temperatures tomorrow will likely break 60, and a few readings around 65-69 wouldn't be too surprising.

Friday
By Friday morning, a cold front will near the Appalachian Mountains, and the chance of showers (and a few thunderstorms) will increase once again. Any showers/thunderstorms that manage to develop will be few and far between, which is why precip chances are relatively low (around 30 or 40 percent).

Image: Precip Forecast from the MM5 Model valid Friday afternoon