From the ABC 7 Weather team

Live blog on heavy rain and flooding

September 7, 2011 - 06:35 PM
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Flooding is likely through tonight with very heavy rain moving in from the south.

12:45 A.M. Update: FLASH FLOOD EMERGENCY IN EFFECT UNTIL 430 AM EDT FOR NORTHWESTERN ST. MARYS...EASTERN CHARLES...EXTREME SOUTHEASTERN BALTIMORE... NORTHWESTERN CALVERT...PRINCE GEORGES AND ANNE ARUNDEL COUNTIES...

AT 1217 AM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED MAJOR FLASH FLOODING ACROSS CHARLES COUNTY...PARTICULARLY THE NORTHERN PART OF WALDORF...WHERE NUMEROUS WATER RESCUES ONGOING

Dangerous flooding continues overnight eastern and southern suburbs.

12:20 AM Update  Tornado warning until 12:45 AM  Storm with rotation moving toward Annapolis.  Always risk of small whirlwind wind winds of 60 mph.  Larger threat is still local flooding.  More unusual nighttime thunderstorms.  The rotating storm which has caused numerous warnings but no confirmed tornado moving into the Bay.  Widespread flooding much more a danger tonight

11:35 PM Update  Flash Flood Warning Continues thru 4AM

The training rains continue with the heaviest persistent rains to the east of DC.  Could easily be another 1-3" in spots before this breaks up late tonight.  Flash Flood Warnings may be extended late tonight so be very careful in the morning rush especially eastern and southern suburbs

10:27 PM Update: Flash flood warning for

ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND... PRINCE GEORGES COUNTY IN CENTRAL MARYLAND... NORTHWESTERN CALVERT COUNTY IN SOUTHERN MARYLAND... SOUTHEASTERN BALTIMORE COUNTY IN NORTHERN MARYLAND... EASTERN CHARLES COUNTY IN SOUTHERN MARYLAND... NORTHWESTERN ST. MARYS COUNTY IN SOUTHERN MARYLAND

until 4:30AM  More heavy rain over night and plenty of delays for AM and travel problems.  Don't take chances with water on roadways or any moving water in what usually are small streams

10:07 Update: Flash Flood Warning now until 4AM DC east and north.  So far no reports of tornadoes but more warning may come.  Any will be small whirls and not a very dangerous storm but stay safe and inside

9:30 Update: A TORNADO WARNING for Charles, St. Mary's, & Prince Georges Counties until 10:15 PM tonight: Bryantown and Hughesville are in the path of this storm.

9:06 Update: Dahlgren VA is right in the path of this TORNADO WARNING.  Take shelter now if you're in this storm's reach.

8:52 Update: A TORNADO WARNING has been issued for King George county in the Northern Neck until 9:15 PM.  The communities of Ninde and Berthaville are in the path of this storm.

8:34 Update: It appears a Low Level Jetstream may have developed right across the I-95 corridor tonight.  I'll have a complete blog explainer about it later tonight.  Just the quick and dirty details about it and how it affects you right now.  This feature could enhance the t'storm activity as we go into the overnight hours and could mean another round of flooding.  Heavy storms currently affec Loudoun CO and a big area of heavy rain is moving over the Potomac into Charles and Prince William counties over the next half hour.

All of this rain still sees more storms continuing to fire south which means we are a long way from these storms being over in DC.

8:16 Update: TORNADO WARNING has been allowed to expire for Calvert County in MD.  Heavy rain is moving back towards the DC metro.  Northern Virginia getting the first bouts of this round of rain towards Manassas and will affect western Fairfax and Loudoun counties over the next hour.

8:01 Update: A FUNNEL CLOUD has been reported with possible trees down from this storm just south of Leonardtown MD in St. Mary's County.

7:56 Update: TORNADO WARNING has been issed into Calvert County MD now until 8:15 PM.  Port Republic & Prince Frederick are communities in the path of this storm.  Take shelter now if you live in this storm's path!

7:26 Update: A TORNADO WARNING has just been issued for a severe thunderstorm showing signs of rotation on doppler radar until 8 PM tonight.  California and Hollywood MD are some locations that are in the path of this storm.  Seek shelter now if you're in the path of this storm!

7:19 Update: Heavy storms are affecting Northern Anne Arundel County into Howard County in MD with moderate to heavy showers extending south along the Anne Arundel and Prince Georges County lines.  This area of rain will continue to keep high water levels up through tonight.  A batch of light to steady rain is moving northward along the I-95 corridor and will be in the metro over the next hour.  Northern Virginia's next bout with heavy rain will hold off for several more hours, but could be likely by the 11PM hour tonight as they're holding together fairly well between Fredericksburg and Richmond.

6:30 Update: The Tornado Warning that had been in effect for areas in the Middle Peninsula of VA has been allowed to expire.  Another cluster of rain with a few areas of heavier showers will affect mainly the East Metro over the next hour or two.  An area of heavier storms still sits over Richmond and could eventually affect more of DC later tonight.  Remember the Flood Warning continues for most of the DC metro through 11:15 PM tonight as smaller streams and rivers have yet to crest from the extreme storms around the noon hour.

5:38pm Update: A Tornado Warning is in effect until 6pm in the Middle Peninsula in a storm or cluster of storms that will eventually move into Southern Maryland over the next hour or so. This is a good reminder that there is plenty of shear in the atmosphere and definitely enough for a short lived tornado.

5:30pm Update: The Flash Flood Warning has been replaced by a Flood Warning for D.C., Arlington, Alexandria, Falls Church and Fairfax until 11:15pm tonight. More rain will be moving into the region this evening and into tonight which may bring back the need for a Flash Flood Warning.

4:45pm Update: More showers and thunderstorms are developing south of town and will progress into our area over the next couple of hours. This will affect the same areas that have already had the very heavy rainfall which will continue to make for the possibility of flooding. The heaviest rainfall will be along and east of I-95 through the overnight hours.

3:54pm Update: Here is the radar estimated precipitation from the National Weather Service today. Some areas received 5 to 6 inches of rain so far. The remainder of the afternoon and evening will have scattered showers and storms with more possible through tonight. Most of the action should remain along and east of I-95.

Radar estimated precipitation

3:18pm Update: Here's a picture from our old meteorologist Alan Auglis from his house in Charlotte Hall, MD in Southern Maryland. Please send any pictures or videos to iwitness@wjla.com

Flooding in Southern Maryland

2:50pm Update: Here's video from Ellicott City, MD earlier today.  Don't try to cross flooded roadways like the guy did in this video. A) You have no clue what is in that water (i.e. snakes, branches, etc.) B) The water is moving a lot faster than you think and water only 6 inches deep can knock you off your feet.

2:38pm Update: Here is a good site to keep an eye on current river levels and river forecasts as flooding is forecast in the D.C. area rivers over the next 48 hours if it isn't already occurring.

Here is a note from the Maryland Natural Resources Police:

Boating and other recreational uses of the upper Potomac River and its creeks and stream should be avoided.

The advisory issued Wednesday runs through Friday when Natural Resources Police say it will be updated if necessary. Natural Resources Police say recent rains have made river levels hazardous in the main stem of the upper Potomac from Cumberland to Little Falls. The department says hazardous stages pose a threat to non-whitewater vessels and activities such as tubing and swimming.

2:29pm Update: The latest Mid Atlantic Radar loop shows rain is really beginning to weaken as it exits the D.C. area. Some thinning has also been noted in the clouds over the past hour especially south of D.C.

1:53pm Update:

 You can now see the back edge of the rain clearly showing up in Live Super Doppler radar which is great news for commuters this evening. The heaviest rainfall will be north and east moving out of the eastern Baltimore suburbs and into the Eastern Shore and north into PA and NJ.

Live Super Doppler as of 1:50pm

1:43pm Update: Weather blogger John Metcalfe just wrote more about the on going flooding which you should definitely take a look at.

Updated rainfall totals:
Columbia, MD: 4.61"
Jessup, MD: 2.87"
Indian Head, MD: 2.59"
Landover, MD: 2.15"
Arlington, VA: 1.87"
Washington, D.C.: 1.55"
Woodbridge, VA: 1.51"

 

1:28pm Video Update:

1:08pm Update:

Check the Local Storm Reports from the National Weather Service to see where flooding has been reported throughout the day. Please be sure to send any pictures or videos to iwitness@wjla.com

12:51pm Update: Traffic cameras in the D.C. area show plenty of gridlock with flooding reported along 14th street in D.C. - http://www.trafficland.com/city/WAS/

12:47pm Update: A Flash Flood Emergency has been issued for northern Prince Georges, Anne Arundel and Baltimore, Howard and Carroll Counties until 2:30pm. Water rescues have been on-going and rainfall amounts have already surpassed 3 inches in portions of those areas with another 2 to 3 possible.

12:33pm Update: The heavy rainfall will move into the I-495 cooridor in the next few minutes with rainfall rates up to 2 inches per hour. Here is what Warning Coordination Meteorologist Chris Strong just sent us from the National Weather Service office in Sterling, VA:

Our DC/Baltimore Media partners,

Just wanted to give additional encouragement to hammer on these flooding rains that will be moving north through the DC and western Baltimore metro areas in your broadcasts. Some of this rain is expected to fall at 2" per hour rates, and some of our area may see up to 5 or 6" of rain this afternoon. I would expect in the DC metro and western Baltimore metro that there will be many water rescues and flooded roads. Please encourage people to "Turn Around/Don't Down" for flooded roads, and to have kids stay away from flooding culverts (there have been several deaths over the years from this). Much of the below threat area is already under a NWS Flash Flood Warning.

12:28pm Update:
Area rainfall totals so far today...
Columbia, MD: 2.64"
Indian Head, MD: 2.2"
Beltsville, MD: 2.1"
Laurel, MD: 1.79"
Arlington, VA: 1.57"
Capitol Heights, MD: 1.47
Chevy Chase, MD: 1.45"
College Park, MD: 1.33"

12:12pm Update: Heavy rainfall will continue to move into the D.C. area through the afternoon. Rainfall amounts will easily be over 3 inches today with locally higher amounts. There are numerous Flash Flood Warnings ongoing including the I-95 Cooridor and D.C. until 1:45pm, Prince Georges and Southern MD until 6:15pm, and Anne Arundel and Prince Georges north to Baltimore until 2:30pm.

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