From the ABC 7 Weather team

Severe weather in the D.C. area yesterday our (Live Blog)

September 19, 2012 - 06:40 AM
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Strong storms with damaging winds and isolated tornadoes will be possible in the Mid Atlantic today.

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6:13pm: Tornado watch has been canceled for all counties West of the Chesapeake Bay.  The severe threat for the area is over.  Showers will continue through about 9pm, but skies will clear overnight and cooler, drier air will return for tomorrow.

5:27pm: Tornado watch canceled for the entire viewing area with the exception of Calvert and St. Mary's county, which continues through 7pm. 

5:14pm: Severe threat over, but showers, and a few bands of heavy rain, are still possible through the rest of the evening.  Temperatures are already dropping into the 60s.

4:38pm: Check out our Stevensville WeatherBug camera as the line heads over the Chesapeake Bay!

4:24pm: Anne Arundel county under a Severe Thunderstorm Warning until 4:45pm. 

Live Super Doppler

4:15pm: Tornado watch has been canceled for D.C. and counties West.  The Tornado Watch remains in effect through 7pm for Prince George's, Anne Arundel, King George, and couties East.  Here's the latest watch map.  I wouldn't be suprised if the current counties are dropped early.

Tornado Watch until 7PM for counties highlighted in yellow

4:08pm: Here is typically what the D.C. area saw with heavy rain and gusty winds with the line that moved through. This was taken by our own Sam Ford in the Bloomingdale part of D.C. 

Heavy rain in the Bloomingdale part of D.C.

4:01pm: Severe thunderstorm warning for Calvert, Charles, and St. Mary's counties until 5pm.  The line currently extends from Clinton, to Waldorf, and towards La Plata and is moving East at 45mph.  There is still minimal lightning, but expect torrential rain and gusty winds.

Live Super Doppler

3:58pm: Here was a picture taken by Dave Johnson at Dulles Airport of an Air France A380 awaiting the line of storms.

Air France A380 from Dave Johnson

3:50pm: The severe line of storms continues to push east of D.C., though heavy rain is still common through much of the area even west through Loudoun and Clarke Counties. The worst part of the line will affect Charles, Anne Arundel, Calvert and St. Mary's Counties over the next hour to hour and a half. Wind gusts to 60 mph will be possible as well as very heavy rainfall with 2 inch amounts common.

Frederick, MD has received 3.74 inches of rain at Hillcrest ES, Martinsburg picked up 2.03 inches at Rosemont ES and Dale City has seen 1.53 inches so far at Godwin MS. Be careful on your commute home as it is sure to be a wet one!

3:44pm: Severe thunderstorm warning in effect until 4:30pm for Anne Arundel, Calvert, Charles, St. Mary's & King George's counties.  These areas can expect downpours and gusty winds. 

3:35pm:  Tornado warning is canceled for Prince George's and Montgomery counties.  Still expect some heavy rain and gusty winds along the main line of storms that's moving through Prince George's and Anne Arundel county.  More storms building just South of D.C. and South along I95.   

3:26pm:  Latest live doppler in the area where the Tornado Warning has been issued.  No strong indication of rotation; however, there could be a little spin up and with the heavy rain it could be difficult to see.  This line of storms moving very quickly to the NE at 45 mph.

Live Super Doppler

3:16pm: A Tornado Warning is in effect until 3:45pm for Prince Georges and Montgomery Counties. Locations that may be impacted are Chillum, Beltsville and Fairland. It's moving along Rt. 1 and I-95. There is no ground sightings of this tornado, it is radar indicated.  Still seek safety at this time if you are in the path of this cell. 

3:13pm: Here's a picture from Lauren Bevington of the approaching line in Tysons Corner about 20 minutes ago.

Here's a picture from Lauren Bevington in Tysons Corner, VA

3:10pm: Severe thunderstorm warning now extended until 4:15pm for D.C., Arlington, Fairfax, Montgomery, Prince George's, and Anne Arundel counties. Storms are moving quickly to the NE at 15mph.

3:03pm: The line of storms is currently moving through the D.C. Metro and 495 Beltway. It stretches from Rockville and Bethesda south to Lorton and will move over the Potomac into D.C. and Prince Georges County in the next 15 mintues. 

2:55pm: Here's a view of the line from Virginia from Whitney Wild. 

Photo from Newschannel8's Whitney Wild

2:36pm: Strong line now moving into western Fairfax County, Montgomery County and Prince William with damaging wind gusts and heavy rain possible. Watch out Reston, Herndon, Fairfax City and east towards Arlington, Alexandria and D.C. In addition, people around Rockville, Silver Spring, Gaithersburg and Bethesda should stay indoors over the next hour.

2:25pm: Here's a look at the severe line heading towards Fairfax and D.C.

2:16pm: I'm really not liking the look of the line moving into Prince William County in Virginia as it appears to be possibly bowing just a bit. It also looks like it will be heading towards Fairfax, the 66 and 95 corridors, and the D.C. Metro.

The National Weather Service actually just issued a Severe T-Storm Warning for this line that extends through D.C., Fairfax, Prince William and Montgomery Counties until 3:15pm. The line is moving around 50mph and winds may exceed 60mph in this line.

1:53pm: A severe line of storms has developed and is heading east towards the D.C. Metro. The main line is already heading into Loudoun, Montgomery, Fauquier, Prince William and Fairfax Counties. In addition, a Flash Flood Watch is now in effect until 8pm for the majority of the D.C. area.

1:00pm: There have already been a few storm reports today in Loudoun and Clarke Counties in VA. Trees were reported down in Purcellville in Loudoun and Wickliffe and Briggs in Clarke County.

12:51pm: A heavy line of storms will continue to move through Frederick and Loudoun Counties. Here's a view.

12:42pm: There is a line developing from Pennsylvania south into Maryland and Virginia that you can see here on this Mid Atlantic Radar loop. It appears like this line may get to the D.C. Metro as early as 3pm this afternoon. It will definitely accompany damaging wind gusts and very heavy rain so be sure to stay tuned here for further updates.

12:29pm: Speaking of that heavy shower, a Severe T-Storm Warning is in effect until 1:30pm now for the line moving into Northern Loudoun County in VA and Frederick County in MD. Damaging winds in excess of 60mph will be possible in this line as it heads towards the City of Frederick.

12:18pm: Another heavy rain shower with gusty winds will be entering western Loudoun County in VA and southwestern Frederick County in MD. Wind gusts to 40 mph or higher will be possible along with the heavy rainfall.

11:51am: Here's a quick severe weather video update.

11:27am: An upgrade to a Moderate Risk for storms will be coming soon from the Storm Prediction Center. This continues to show just how volatile the atmosphere is today. Be safe! 

11:19am: Severe Thunderstorm Warnings are now in effect for Loudoun and Frederick Counties as this strong line of storms moves east. The most dangerous part of the storm right now is along the Jefferson, Clarke and Loudoun County borders moving northeast around 40 mph. 

10:56am: A Tornado Watch is in effect for the entire D.C. Metro area until 7pm tonight. Be prepared today to take shelter immediately preferably in a basement or a small interior room away from doors and windows.

10:41am: With severe weather imminent for the D.C. area. Know what to do in case of a power outage and what to do with your food in case you lose power for a prolonged period of time.

What to do in case you lose power?

How long will your food last? Food Safety List Here

10:35am: The first Severe Thunderstorm Warning of the day is in effect until 11:15am for much of the Shenandoah Valley. Winds in excess of 60mph will be possible along this line.

10:28am: Here are some of the greatest rainfall totals so far today from our WeatherBug Network:

Wintergreen Mountain: 2.97"      Frostburg, MD: 1.87"      Hagerstown, MD: 1.39"      Martinsburg, WV: 1.29"      Harrisonburg, VA: 1.11"

10:21am: Rainfall potential across the area looks good with up to an inch or two of rain across the area. Flash flooding doesn't seem like a huge threat with the recent stretch of dry weather but could be possible if areas get more rain than anticipated. Below is from one of our in house weather models. Here is what HPC is thinking for today.

Rainfall Potential Today

10:05am: This is what we are thinking as far as threats to the D.C. area today. The highest threat will be damaging winds, with the secondary threat being isolated tornadoes. We will let you know as soon as any watches or warnings are posted.

Main threats for the D.C. area today

10:01am: Check out this WeatherBug camera is storms enter the Raleigh, NC area over the next hour.

9:56am: A Tornado Watch has been issued for Central North Carolina including the Raleigh area until 5pm this afternoon.

9:49am: A Mesoscale Discussion has been posted for our region and south into North Carolina, stating that a Tornado Watch may be needed to be placed in the circled area in the next few hours. The Storm Prediction Center is monitoring our area and will place the region under a watch if necessary.

Mesoscale Discussion Area as of 7:49am

Here's the story. A strong area of low pressure and associated cold front will move through the region today. Ahead of this front, there is a tremendous amount of shear in the atmosphere, which is basically winds changing in speed and direction with height. It is so today that not only will damaging winds be possible, but also the potential for tornadoes. Be sure to stay with this live blog through the rest of the day to know exactly what is going on across the D.C. area.

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