Radar & lightning: Latest D.C. area radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

Overview: A severe thunderstorm watch has been issued for most of the D.C. area except Southern Maryland (see map) until 11 p.m. Severe storms may weaken as they move west to east into and across the area, but could still significantly impact the D.C area approximately 8:45 p.m. to midnight.

The National Weather Service warns of the possibility of damaging wind gusts to 70 mph and an isolated tornado. Stay tuned to the blog here and to our social media feeds for updates as needed.

10:20 p.m. update: The worst is over for the evening as the storms head east toward and across the Chesapeake Bay, with moderate showers lingering behind. The severe thunderstorm watch has been cancelled for the metro area. Some damage reports include trees and wires down in Ellicott City (Howard County), and in Clarksburg, Damascus and Germantown (Montgomery County). See more damage reports here. Power was out at one point for more than 2,000 Pepco customers in Montgomery County, but those numbers seem to be dropping steadily.

We may do this all over again tomorrow and perhaps Tuesday before much nicer weather moves in. See our full forecast here.

9:25 p.m. update: A severe thunderstorm warning now issued for eastern Montgomery, the southern two-thirds of Howard, far northern Prince George’s, and far northwestern Anne Arundel counties until 9:45 p.m. These areas will receive the most intense portion of this storm system, with heavy rain, frequent lightning, and winds that could gust over 60 mph (capable of bringing down trees).

9:15 p.m. update: There are currently no severe warnings in effect in the D.C area. But the portion of the storms moving west to east through Montgomery County is quite intense with heavy rain, gusty winds and frequent lightning. Elsewhere the storms, which are mainly affecting the northern half of the area, seem to have weakened a bit as they continue east.

8:28 p.m. update: A severe thunderstorm warning is now in effect until 9 p.m. for Loudoun, southern Frederick northwest Montgomery, far northwestern Howard, and the far northern fringes of Prince William and Fauquier counties. A lot of lightning with these storms as well as the potential for damaging wind gusts over 60 mph.

8:17 p.m. update: The northern end of these storms are racing fast to the east across northern Maryland, prompting a severe thunderstorm warning until 8:45 p.m. for the northern two-thirds of Frederick County and most of Carroll County except the far southern fringe. The storms are moving east into and across the warned area at 50 mph, with winds gusts possibly exceeding 60 mph, in addition to heavy rain and lightning.