* Flash flood warning in effect for much of region through around 11:30 p.m. tonight. 2-4” of rain possible. Do not drive through flooded roadways. Turn around, don’t drown. *

UPDATE, 10:15 p.m.: The tornado watch has been discontinued for Frederick, Loudoun, Fairfax, Prince William and Stafford counties. The back edge of storms has passed through Loudoun and western Montgomery county.

These grand finale storms have now reached the east side of the beltway into Prince George’s county. While not severe, they will produce some lightning, heavy downpours, and gusty winds so use caution. Especially be on the lookout for standing water. The storms should be over for most by 11-11:30 p.m.

Rainfall totals inside the beltway have generally been from around 1-2” with some locally heavier amounts to 3” Outside the beltway, amounts varied widely from less than 0.5” to more than 3” (in eastern Frederick county) depending on storm tracks.

Link: Impressive rainfall totals from the WeatherBug network.

Unless any more warnings are issued, this will be the last update.

UPDATE, 9:55 p.m.: Final line of storms to I-95. If you’re in Leesburg and Frederick or the west, you’re done with severe weather.

UPDATE, 9:45 p.m.: Last of storms have moved inside beltway. Should end from west to east over next hour to 75 minutes. Tornado watch will be discontinued soon.

UPDATE, 9:30 p.m.: Final squall line moving into C Fairfax & Montgomery co, about to move inside beltway w/ heavy downpours, gusty winds...no warnings...yet.

Overview: A tornado watch is in effect for the entire Washington, D.C. and Baltimore metro region through 2 a.m. tonight. A volatile, dangerous situation for the mid-Atlantic as a strong, dynamic cold front sweeps through the region this evening. A combination of instability and spin in the atmosphere mean development of violent thunderstorms with damaging winds, large hail and tornadoes are possible. A flood watch is also in effect for the entire region through midnight. Widespread 1-2” of rain is likely, with localized amounts to 4”.

Impacts: Numerous funnel cloud sightings have been reported today. Confirmation of tornadoes awaits official storm surveys by the National Weather Service. One tornado was reported on the grounds of BWI Airport but there were no reports of damage. We have received reports of downed trees in a number of areas but no major structural damage.

For a time, ground stops were in effect at all three area airports (DCA, IAD, and BWI), and severe delays continue of 2-3 hours or more.

Amtrak said around 6 p.m. that service between BWI airport and Aberdeen was delayed because of a “power system problem.” It said repairs were underway.

Marc train reported power went out about around 6 p.m. and is coming back. It has caused delays.

On metro, orange line service was halted between Cheverly and Deanwood following multiple downed trees across the tracks outside Cheverly. Limited Orange Line service has been restored between Stadium-Armory and Cheverly; there are 20-25 minute delays.

We’ve also received multiple reports of street flooding. In Prince George’s county, 3 motorists stranded in high water required swift water rescue.

Basic information link: Breaking down today’s storm threat

Photos, video and storm reports: Funnel cloud near Elkridge, Md | Impressive funnel cloud or tornado video from Greenbelt | Possible tornado near Brambleton, Va Photo taken at 2:54 p.m. | Another Brambleton image | East Capitol Street flooded | Funnel cloud or tornado in Sterling, Va taken between 2 and 3 p.m. | Video of funnel cloud in northern Loudoun or southern Frederick county | Video of funnel cloud seen from Takoma | Video of funnel cloud near Sterling | Spectacular storm cloud over Manassas | Video of storm crossing Potomac river into Charles County | Video of dramatic water rescue by Prince George’s County Fire Department | Submit and view photos

Monitor severe warnings issued by the National Weather Service and radar on our Severe Weather Tracking Station below. Also, comment below with conditions where you are.

Severe Weather Tracking Station
Warning Text: DC | MD | VA * NWS Local Storm Reports
Warnings: Severe alerts from National Weather Service. Updates w/o refresh (most browsers). Hint: Alert on map? Click matching label in key for details.

See below for storm photo collection and previous warnings and updates....

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Earlier updates

UPDATE, 9:05 p.m.: A large severe thunderstorm warning covers area from southern Spotsylvania county through Stafford county into southern Prince William county and extending east into western Charles county through 9:30 p.m Wind gusts in excess of 60 mph possible. In path: Dale City, Woodbridge, Fredericksburg, Stafford..

UPDATE, 9:00 p.m.: TORNADO WARNING for E Frederick, N Montgomery, Carroll, W Baltimore, & NW Howard co til 9:30 pm. At 8:54 doppler indicated possible tornado 5 miles NW of Mt. Airy moving NE at 50 mph. Potentially impacted: Westminster, Manchester. . Take cover NOW

UPDATE, 8:55 p.m.: Tornado WARNING for NE Frederick and NW Carroll co til 9:15 pm for poss twister 8 miles E of Emittsburg moving NE at 45 mph. Take cover NOW.

UPDATE, 8:50 p.m.: Final round moving in. Severe t'storm warning for E Frederick, N Montgomery, Carroll, NW Balt & NW Howard co. Winds may gust to 60 mph+

UPDATE, 8:45 p.m.: The BWI tornado observation is legitimate. The National Weather Service issued this preliminary report: “TORNADO WAS REPORTED INSIDE THE AIRPORT PERIMETER. TREE DEBRIS FROM THE TORNADO WAS REPORTED BY TOWER PERSONNEL”

UPDATE, 8:40 p.m.: For the first time in hours, no tornado or severe t'storm warnings are in effect in the DC/Baltimore region. But one more squall line may produce new ones after 9 p.m. This should all end by around 11 p.m.

UPDATE, 8:20 p.m.:Flash Flood Warning extended until 11:30 p.m. Rainfall amounts have generally been around 0.5-2.0” so far. We have one more squall line to come through which could produce another 0.5” or so of rain with some locally higher amounts.

UPDATE, 8:15 p.m.: BWI tornado observation may have been a mistake by observer. Have not been able to confirm there was a tornado.

UPDATE, 8:00 p.m.: The Storm Prediction Center has extended the tornado watch until 2 a.m. for the D.C./Baltimore region. While the primary risk with these storms now is flash flooding, an isolated tornado or two remains possible.

UPDATE, 7:45 p.m.: The BWI Airport weather observer reported a tornado at 7:35 p.m . Awaiting more details.

UPDATE, 7:33 p.m.: Severe Thunderstorm Warning until 8 p.m. - E Charles, NW St. Mary's, SE Prince George's & W Calvert. Severe storm near La Plata may produce damaging winds of 60+ mph. Moving NE at 40 mph. In path St. Charles, Waldorf

UPDATE, 7:23 p.m.: TORNADO WARNING for S Baltimore Co & S Baltimore city & N Anne Arundel co til 7:45 pm. At 7:18 doppler radar indicated poss tornado near BWI moving NE at 20 mph. In path Fells Point & BALTIMORE INNER HARBOR. Take cover NOW.

UPDATE, 7:20 p.m.: Severe Thunderstorm Warning for NW Anne Arundel, S Baltimore co, E Howard and SE Baltimore City until 8:00pm. At 7:13 severe storm near Severn moving NE at 20 mph to impact BWI airport, Glen Burnie & Canton. Destructive 70 mph winds poss.

UPDATE, 6:20 p.m.: The nature of this event is evolving from a tornado threat into a flash flooding threat. Tornadoes are still possible, but the frequency of warnings should gradually diminish. Instead of individual supercells (rotating thunderstorms), we now have lines of thunderstorms with torrential rain, moving from southwest to northeast through the region.

UPDATE 5:38 p.m.: Flash flood warning for much immediate DC area til 8:30 p.m. 1-2" of rain has fallen, 1-2" more poss. Remember: Don't drive thru flooded roads!

UPDATE, 7:00 p.m.: TORNADO WARNING for N Prince George's, NW Anne Arundel and SE Howard co til 7:30 pm. Radar indicated tornado at 6:54 near Laurel moving E at 20 mph. In poss path: Odenton, Elkridge, Severn.

UPDATE, 6:45 p.m.: Severe thunderstorm warning for Fredericksburg, SE Stafford, & E Spotsylvania county til 7:15 for winds of 60 mph.

UPDATE, 6:04 p.m.: TORNADO WARNING for southern Baltimore co, NW Anne Arundel, & SE Howard co til 6:30. .At 5:53 doppler indicated tornado near Severn moving N at 25 mph. In path: BWI, Elkridge, Catonsville. Warning ends at 6:30. Take cover now.

UPDATE 5:36 p.m.: TORNADO WARNING for central Frederick county including downtown Frederick til 6 pm. Doppler radar indicated tornado at 5:26 near Frederick moving NE towards Thurmont. Take cover now!

UPDATE 5:28 p.m.: TORNADO WARNING for NE Prince George's co, W Anne Arundel co, & SE Howard cty til 6 pm. Doppler indicated tornado at 5:23 near Bowie moving NE at 30 mph. In path: Crofton, Odenton, Severn.

UPDATE 5:09 p.m.: Tornado Warning for southern Fairfax and central Prince William County until 5:45pm.At 5:07 p.m. radar indicated tornado near Dale City moving NE at 40mph. In path: Burke, Lorton, Springfield, I-395/495 interchange. Take cover now and do not travel in this area!

UPDATE 5:06 p.m.: Severe thunderstorm warning til 5:30pm for C Prince William, N Stafford, SE Fauquier, S Fairfax co & Fairfax and Manassas.

UPDATE 4:50 p.m.: Severe thunderstorm warning for eastern Washington, D.C., southeast Arlington county, southeast Alexandria, central Prince George’s county, southern Anne Arunel county, and eastern Fairfax county. At 4:44 severe storm near National Harbor moving NE at 20 mph - storm will impact US Capitol, Andrew Air Force Base, Anacostia, Camp Springs, and Kenilworth.

UPDATE 4:45 p.m.: Tornado warning for WASHINGTON DC, western Prince George's co til 5:15. Take cover now, esp E side of DC. Doppler indicated tornado near Ft. Washington at 4:42 moving NE at 20 mph towards National Harbor, Oxon Hill, Camp Springs.

UPDATE 4:30 p.m.: Tornado warning for southern Baltimore county, northwest Anne Arundel county, and southeast Howard county until 5 p.m. Possible tornado near Elkridge at 4:31 p.m. moving northeast at 20 mph. In path BWI airport, Catonsville. Take cover now.

UPDATE 4:40 p.m.: Severe thunderstorm warning for northern Charles, southern Alexandria, western Prince George’s and southeast Fairfax co until 5:15 p.m. At 4:25 p.m. severe storm was located near Ft. Belvoir moving NE at 15 mph towards Ft. Washington, National Harbor and Oxon Hill.

UPDATE 4:18 p.m.: Severe t'storm warning for E Montgomery, N Prince George's, NW Anne Arunel and SE Howard co til 4:45. 60 mph winds poss. Storm near Laurel & Beltsville moving NE at 30 towards Elkridge, BWI airport & Ellicott City.

UPDATE 4:15 p.m.: TORNADO WARNING for N Charles co and SW Prince George's co til 4:45 p.m. Doppler indicated tornado near Indian Head at 4:12 pm moving NE at 30 mph. May impact Waldorf. Take cover now!

UPDATE 4:00 p.m.: Severe thunderstorm warning for western Charles, southeast Prince William, southwest Prince George’s and southeast Fairfax county until 4:30 p.m. Storm was 7 miles south of Woodbridge at 3:46 p.m. moving NE at 30 mph, headed towards Mt. Vernon, Fort Belvior, Franconia, and Ft. Washington.

UPDATE 3:45 p.m.: Flood watch for entire region through midnight. Widespread 1-2” of rain likely, localized amounts to 4”.

UPDATE 3:40 p.m.: Tornado warning for central Carroll and northwest Baltimore county until 4:15 p.m. Possible tornado 7 miles east of Westminster heading northeast at 30 mph.

UPDATE 3:30 p.m.: Severe thunderstorm WARNING for E Fairfax co, Washington, D.C., SE Montgomery Co, Falls Church, Arlington, Alexandria, N Prince George’s co, W Anne Arunel county, SE Howard til 4:15 p.m. 60 mph damaging winds possible with this storm.

UPDATE 2:55 p.m.: Severe thunderstorm warning for southeast Frederick, northern Montgomery, Carroll and northwest Howard county through 4 p.m. Radar indicates storm near Germantown moving northeast at 35 mph. May produce hail to the size of quarters and 60 mph+ winds. Areas impacted include Damascus, Green Valley, New Market, and Mount Airy.

UPDATE 2:51 p.m.: Severe thunderstorm warning for eastern Prince William and Central Fairfax county until 3:30 p.m.. Includes Arlington, Falls Church city and Fairfax. Storm has some rotation and could produce tornado. Seek shelter!

UPDATE 3:05 p.m.:TORNADO WARNING for N Montgomery co, southern Carroll county, and NW Howard co til 3:30.Radar indicated tornado near Damascus moving NE at 25 mph. Locations in path Sykesville. Warning expires at 3:30 pm. Seek shelter now.

UPDATE: 2:37 p.m.: TORNADO WARNING for eastern Frederick, N Montgomery, S Carroll & NW Howard co til 3 pm. Doppler-indicated tornado near Damascus moving NE at 30 mph towards Mt. Airy. Take cover.

UPDATE: 2:24 p.m.: TORNADO WARNING for for western Montgomery & eastern Loudoun co til 2:45. In path Ashburn, Landsdowne, Poolesville. Radar detected tornado near Brambleton moving NE at 30 mph. Strong rotation indicated. Take cover now if in path.

UPDATE, 2:16 p.m.: TORNADO WARNING for for SE frederick co, N Montgomery co, SW Carroll co, NW Howard co until 2:45 pm. Radar detected poss tornado 5 mi NW of Germantown moving NE at 30 mph. Poss impacted locations Green Valley & Mt. Airy. Take cover NOW.