9:15 a.m. update: Storms have moved off and no warnings are in effect in the area. Cleveland Park and Forest Glen Metro stations (9:30 update--apparently Forest Glen has reopened) are closed due to earlier flooding. More than 100,000 power outages across region - see more storm impact info/photos on Post Local. We'll have updated forecast info and post storm coverage coming shortly...
For a summary of flash flooding and wind damage reports across the area, see National Weather Service Storm Damage reports.
8:45 a.m. update: Severe thunderstorm warnings remain in effect for Charles, Calvert, and St. Mary's counties through 9:15 a.m. where extremely heavy rain, flooding, and damaging winds remain possible. Across the Bay, a tornado warning is in effect in southeastern Talbot county through 9:00 a.m. Fortunately, across the rest of the region, storms have ended and the sun is coming out. There is a chance of additional storms later this afternoon, though they should not be as strong. Stay tuned for a forecast update in the next hour.
8:15 a.m. update: Powerful thunderstorms now exiting District and impacting southeast Fairfax, southern PG and Anne Arundel counties. Over the next 30 minutes, the storms will sweep through northern Charles and Calvert counties. The storms have produced tens of thousands of power outages, wind gusts to near 60 mph (58 mph gust in Montgomery Village). Doppler estimated rainfall totals indicate around 1 inch of rain (with isolated 1.5"+ amounts) was produced by these storms -- in just about 30 mins -- enough to cause flash flooding.
@swegl: deep water on rt 50 east at ballston/glebe exit. but everyone seemed to get through it fine - just backing up traffic.
@thedcrider: About that flash flood at 15th and Constitution NW http://tweetphoto.com/38439947.
@JCDavis19 all hell broke loose in Rock Creek Park. Trees and limbs down, including on top of my parents' house.
Keep reading for earlier updates...
7:45 a.m update: Intense thunderstorms are continuing to slide east and southeast. The storms -- now exiting Montgomery county (PEPCO reporting over 60K outages there), have swallowed the District and northern Prince George's county and will head into southeast Fairfax, central and southern PG and then Calvert counties. These areas can expect torrential rain, potentially damaging winds and frequent lighting.
@MDScot: More water on the Ameri Legion bridge than under it
@chriscardno: tree down on a bus in potomac, seven locks road closed.
@CindyBoren: I'm shaking, flooding on Veirs Mill near Ct Ave. People having to be rescued from cars, sitting on hoods and roof
From 7:00 a.m.: A cluster of strong to severe thunderstorms is moving through the northern suburbs and towards the District. Torrential rain, thunder, gusty winds and lightning have been reported in Montgomery county. Over the next 30 to 45 minutes these storms will move to the east and southeast impacting northeastern Fairfax county, the District, as well northern Prince George's and Anne Arundel counties. The main impact with these storms will be the very heavy rain which will reduce visibilities for morning commuters -- especially from the north side of the beltway and to the northeast. In addition, gusty winds and frequent lightning are likely with these storms while hail has been reported in a couple instances.
Recommend allowing extra time for what will be a difficult commute -- especially on the northern side of the Beltway and into the District.
Reader tweets and comments
@Buffalo_Theory: Flooding on veirs mill in Wheaton. Water up to bumpers/headlights.
@GranthamCW: this stuff is no joke. It looks like 3am out my window and the rain is coming down at a 30 degree angle.
@Hoyas4Ever: Getting hammered in Silver Spring. Scary hail.
@wendywoowho: Saw a car floating down the street on Great Falls in Rockville. Nasty out there.