9:30 p.m. update: Strong to severe storms have developed west of Washington, D.C. along the I-81 corridor in northwest Virginia. Additional strong storms are developing to the southwest and south and are likely to affect the region through the early morning hours, first in the western suburbs and eventually working east.
The Storm Prediction Center indicates a slight risk of severe thunderstorms, including damaging wind gusts and large hail. An isolated, brief tornado is also not out of the question.
Original post: Today’s clouds and mild southerly winds presaged the arrival of a dynamic cold front tonight. A batch of showers and thunderstorms will accompany this front, with possible gusty winds. The rain clears out by Friday mid-morning, marking the start of an extended stretch of sunny days.
Through Tonight: Cloudy, breezy, and mild through mid-evening. Showers and perhaps thunderstorms increase in coverage after 8 p.m. and should overspread much of the region by midnight. A few showers/storms may be accompanied by some gusty winds over 30 mph, but widespread damaging winds are not likely. Overnight lows are mild, mainly in the low-to-mid 50s. Rainfall totals should be in the range of 0.25-0.5”.
Friday: Some lingering showers are possible, especially along and east of I-95. By late morning, sunshine is increasing from west to east and by the afternoon, it’s mostly sunny in most locations. As the cold front doesn’t clear the area until the afternoon, high temperatures are able to climb to 70-75. Winds are from the south at 10-15 mph.