From the ABC 7 Weather team

D.C. severe weather live blog: Dangerous, severe storms to impact region

June 1, 2012 - 11:20 PM
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A complex and potentially dangerous weather system will impact the region between 4-11 p.m. This live blog will be your go to site for continuous updates and the latest information as we continue to monitor this potentially dangerous event.

11:22 PM:  Final update from the Live Blog -- expect the last of the showers to push East and clearing skies to follow. 

10:30 PM:  Everything really settling down out there.  TORNADO WATCHES in effect through 2AM for the Washington metro and points East; although, I wouldn't be surprised if these watches were dropped early.

9:45 PM:  Last line approaching the D.C. metro area now.  Most likely through the area within the hour. 

Live Super Doppler at 9:48 PM

9:17 PM:  Here's another photo we received earlier from Woodbridge, VA.  Looks like a funnel cloud behind the two houses. 

Viewer photo from Woodbridge, VA

9:02 PM:  TORNADO WARNING in effect for parts of Baltimore, Howard, and Montgomery counties until 9:30 PM.  Storm 5 miles NW of Mount Airy & 11 miles North of Damascus.  This is VERY FAST moving storm -- 50 mph! 

Live Super Doppler 7 at 9:04 PM

8:54 PM:  SEVERE THUNDERSTORM WARNING for Charles, Prince Georges, Fredericksburg, Culpeper, Fairfax, Fauquier, King George, Orange, Prince William, Spotsylvania, and Stafford counties until 9:30 PM. 

8:45 PM:  Take a look at local rainfall totals from our WeatherBug network.  This is why we are concerned with flash flooding.  A LOT of rain in only a few hours.  Be safe on the roads and NEVER drive through flooded streets.

WeatherBug rainfall totals as of 8:30PM

8:30 PM: THE FLASH FLOOD WARNING FOR D.C., MONTGOMERY, FAIRFAX, FALLS CHURCH, ARLINGTON, ALEXANDRIA, AND NORTHERN PRINCE GEORGES COUNTIES IS EXTENDED THROUGH 11:30PM. 

8:20 PM:  TORNADO WATCH EXTENDED ANNE ARUNDEL, CALVERT ,CARROLL, CHARLES, FREDERICK, HOWARD,
MONTGOMERY, PRINCE GEORGES, AND ST. MARYS UNTIL 2AM. 

NWS Watch Map

 7:48 PM:  Still watching two lines move through the area.  The first line extends from Baltimore and Southwest along (and just East) of I 95.  The second line, along the cold front, is stretching from Martinsburg, south through Northern Prince William county.  Still enough upper level dynamics for storms to become severe or tornadic.  Flooding, now, the biggest concern across the region. 

Live Doppler as of 7:45PM

7:22 PM:  Newest TORNADO WARNING near BWI.  Southern Baltimore County and Baltimore City and Northern Anne Arundel county under the Tornado Warning until 7:45 PM.  SEVERE THUNDERSTORM WARNING for Washing, Berkeley, and Jefferson counties until 8 PM. 

7:10 PM:  This is the next line of storms we're watching.  Just South of La Plata.  The brighter reflectivity (especially where you're seeing the purple in the middle of that line of storms) indicates the possiblity of hail.  No suggestion of rotation at this time. 

Caption

7:00 PM:  TORNADO WARNING UNTIL 7:30 PM - NOTHERN PRINCE GEORGE'S, NORTHWESTERN ANNE ARUNDEL, AND SOUTH EASTERN HOWARD COUNTIES. 

Live Super Doppler 6:59 PM

6:34 PM:  Thanks to our viewers sending us pictures of the storms and damage (we remind you, your safety comes first, so do not put yourself in harms way when taking these photos).  Here's one we received from a viewer in Columbia, MD. 

Columbia, MD 

 6:28 PM:  Latest radar shows deluge of rain right over the District stretching through Southern Montgomery County.  FLASH FLOOD WARNING continues through this entire area (where you see counties highlighted in maroon color) until 9:15 PM.

Latest radar as of 6:30 PM

6:15 PM:  NEW TORNADO WARNING ALONG A LINE OF STORMS MOVING TOWARDS PAW PAW.  TORNADO WARNING FOR NORTH FREDERICK, WEST MORGAN, NORTHEAST HAMPSHIRE, AND EAST ALLEGANY UNTIL 6:45 PM. 

Live Super Doppler 7 at 6:18 PM

5:22pm Update: 7,700 are reportedly without power in NE D.C and another 2,722 out in SE D.C.

4:56pm Update: Tornado Warning issued for Washington until 5:15 p.m.

3:48pm Update: About 3,500 are reported without power in Stafford County.

3:45pm Update: WTOP reports that a flash flood watch has been issued for the entire D.C. area until midnight

3:34pm Update: All flights into Dulles, Reagan and BWI airports are halted until 3:45 p.m.

3:22pm Update:  A flash flood warning is in effect for Frederick, Montgomery, Carroll and Howard counties until 6:15 p.m.

UPDATE: NWS has issued a tornado warning for eastern Carroll County until 3:45 p.m.

2:45pm Update: A Severe thunderstorm warning has been issued for the counties of Frederick, Howard, Loudoun and Montgomery. In effect until 3:30 p.m.

2:30pm Update: Tornado warning has been issued for southeastern Frederick county in north central Maryland, Northern Montgomery County in central Maryland, southwestern Carroll County in north central Maryland, northwestern Howard County in central Maryland until 2:45 p.m.

What do you do if your power goes out?

12:38pm Update:  There is now a Moderate Risk for severe weather this afternoon over the DC area. The tornado threat has been upgraded a bit from 10% to 15% for the outlook area. The SPC has stated that there is chance for an isolated strong tornado this afternoon and evening. 

Moderate Risk Region Friday

12:25pm Update:

Here is a look at the HRRR Model run this afternoon and evening. The first line which is already on Doppler is below, moving through the region by 1 or 2pm. After that, there may be some clearing before the next system this evening.

2pm HRRR Model Depiction

 This is the depiction for this evening. At this point, we think there is a chance for heavy showers and storms, potentially severe, between 5pm and 9pm tonight. Something our team will be watching for is a Quasi-Linear Convective System with Line Echo Wave Patterns in them. Basically, those are just fancy words for a line of strong thunderstorms with some embedded areas of rotation.

The biggest threats today will be damaging wind gusts and flash flooding. There is a secondary risk for isolated tornadoes. Check out the Storm Prediction Center this afternoon for the latest on the highlighted risk area and to see if there are any watches for our area.

Live Super Doppler 7 is already picking up on some heavy rain southwest of D.C. Be sure to check on it throughout the day.

There are numerous things you can do to help us out today. First and foremost, stay safe. Heed the watches and warnings that are expected to come out later today. Be sure to follow us on Twitter at our various accounts and tweet to us any damage reports, flooding, pictures, video, anything you want. We will post anything we come across that will be of value to you. Here are our accounts below.

@ABC7News        @Newschannel8

@DougHillABC7        @ChrisNaille        @AlexLiggitt

@AdamCaskey        @EileenABC7        @SteveRudinABC7

@DevonLucie        @ChadMerrillABC7        @RyanMillerABC7

Please send in any pictures or video to iwitness@wjla.com

Only take pictures or video if you can do it safely!

Be sure to follow us on Facebook as well as reports will be coming in on the page through the afternoon and evening. Follow these guys on Facebook as well.

Adam Caskey

Steve Rudin

Eileen Whelan

Chris Naille

1:15pm UPDATE:  From the Storm Prediction Center...Tornado Watch Likely… Thunderstorms will increase through the afternoon in a very moist and increasingly unstable air-mass. Isolated storms will first pose a threat for isolated severe weather in the form of hail and winds. Additional severe storms are likely as a forced squall line develops east of the Appalachians later this afternoon. Deep shear and tornado potential may increase across the entire region from late afternoon into the evening. One or more tornado watches will likely be issued over the next 1-2 hours.  - Meteorologist Chris Naille



1:35pm Update:  Tornado Watch Until 9PM For Frederick County, MD, Loudoun, Fauquier, Culpeper, Madison and all Counties north and west.  A second watch box will likely be issued at some point over the next 1-2 hours which will likely include the rest of the viewing and listening areas. 



Credit: National Weather Service

 1:55pm Update:  The entire region is now under a Tornado Watch Until 9PM

2:59PM Update:  Severe storms have already developed across the region.  TORNADO WARNING IN EFFECT UNTIL 3:45PM FOR CARROLL COUNTY.  A SEVERE THUNDERSTORM WARNING in effect for Southeastern Frederick, Northern Montgomery, Carroll, and Norwestern Howard County until 4 PM. 

3:12PM: TORNADO WARNING CARROLL, HOWARD, MONTGOMERY COUNTIES UNTIL 3:45 PM.  TAKE SHELTER IMMEDIATELY.

Live Super Doppler 7 at 3:12PM

3:24 PM UPDATE:  SEVERE THUNDERSTORM WARNING UNTIL 4:15 PM
THE DISTRICT OF COLUMBIA...
SOUTHEASTERN MONTGOMERY COUNTY IN CENTRAL MARYLAND...
CITY OF FALLS CHURCH IN NORTHERN VIRGINIA...
ARLINGTON COUNTY IN NORTHERN VIRGINIA...
CITY OF ALEXANDRIA IN NORTHERN VIRGINIA...
NORTHERN PRINCE GEORGES COUNTY IN CENTRAL MARYLAND...
WESTERN ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND...
SOUTHEASTERN HOWARD COUNTY IN CENTRAL MARYLAND...
EASTERN FAIRFAX COUNTY IN NORTHERN VIRGINIA...

3:40 PM UPDATE:  Got a picturer of a funnel cloud in Sterling, VA.  Numerous storm cells across the region producing heavy rain, flash flooding, and some rotation.

ABC7 Photo of Funnel Cloud in Sterling, VA

3:45PM UPDATE:  Flash Flood Watch in effect for the entire viewing area until MIDNIGHT tonight.  Exteremly heavy rain will fall with these storm cells that will continue to develop through the rest of the night.

4:01 PM UPDATE:  Tremendous video from a viewer, Scott Gast, in Charles County. 

4:48 PM UPDATE:  TORNADO WARNING IN EFFECT UNTIL 5:15 PM FOR WEST PRINCE GEORGES COUNTY AND THE DISTRICT.  TAKE SHELTER IMMEDIATELY.  LATEST RADAR IMAGE. 

Live Super Doppler 7 as of 4:48 PM

4:57 PM UPDATE:  TORNADO WATCH REMAINS IN EFFECT FOR THE ENTIRE VIEWING AREA UNTIL 9 PM & A FLASH FLOOD WATCH FOR THE ENTIRE VIEWING AREA UNTIL MIDNIGHT.   SEVERE THUNDERSTORM WARNING NOW IN EFFECT FOR City of Fairfax, City of Manassas, City of Manassas Park, Fairfax, Fauquier, Prince William, Stafford, VA until 5:30 PM. 

5:07 UPDATE:  TORNADO WARNING REMAINS IN EFFECT UNTIL 5:15 PM FOR WESTERN PRINCE GEORGES COUNTY AND D.C.  You can see a definitive hook in this storm cell which is indicitive of rotation.

Live Super Doppler 7

5:12 PM UPDATE:  NEW TORNADO WARNING FOR CENTRAL PRINCE WILLIAM AND SOUTHERN FAIRFAX COUNTIES UNTIL 5:45 PM.  LOCATIONS IMPACTED LAKE RIDGE... BURKE... LORTON...NEWINGTON... SPRINGFIELD... THE I395 AND I495 INTERCHANGE... FRANCONIA...

Live Super Doppler 7 5:13PM

UPDATE 5:23 PM:  NEW TORNADO WARNING FOR NE PRINCE WILLIAM, WESTERN ANNE ARUNDEL, AND SOUTHEAST HOWARD UNTIL 6 PM.  CITIES IMPACTED: CROFTON... ODENTON... FORT MEADE... ODENTON...MILLERSVILLE... SEVERN... SOUTH GATE. 

UPDATE 5:39 PM:  TORNADO WARNING IN EFFECT FOR FREDERICK COUNTY UNTIL 6 PM; AS WELL AS FOR ANNE ARUNDEL, HOWARD, AND PRINCE GEORGES COUNTIES UNTIL 6 PM.  Here's one of our latest images from a viewer in Greenbelt, MD. 

Karol Olson

 

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