From the ABC 7 Weather team

Live blog on todays heavy rainfall

September 23, 2011 - 10:34 AM
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A Flash Flood Watch is in effect for the majority of the D.C. area through this evening.

With the major flooding still fresh in our minds from the remnants of Lee, everyone has been asking me how much rain we'll see this time around and if it will be as bad. Well the potential is there for 2 to 3 inches of rain with isolated higher amounts, but we're not expecting quite as long as a period of rainfall, so it shouldn't be quite as terrible outside.

I'll keep you posted here throughout the day with any new information, warnings, rainfall totals, forecasts and more.

Be sure to check Live Super Doppler 7 to see where the heavy rain is located.

5:47pm - BWI Thurgood Marshall has tied the record for monthly rainfall in September at 12.41" as of the 5pm climate report. I am pretty sure they broke the record between 5pm and 6pm. Reagan National will not reach it as it is over 17".

4:36pm - Rainfall totals over 2" now in Indian Head, Landover, District Heights, Baltimore and Spotsylvania.

4:11pm - The biggest threat for heavy rainfall is now along the I-95 cooridor and east. Rain has already come to an end along the Blue Ridge and west. Expect moderate to heavy rain for the commute this evening before rain comes to an end late this evening into tonight.

3:10pm - A Flood Warning is in effect for Frederick and Carroll Counties in MD until 7:00pm.

2:52pm Video Discussion -

 

2:20pm - Here are some interesting tidbits on the rain this September in the D.C. area...

Reagan has had 7.32" of rain so far not including today. That's 4.64" above normal but way shy of the 1934 record of 17.45".

BWI Thurgood Marshall has 9.57" so far. That's 6.68" above normal and shy of the 1934 record of 12.41".

Dulles has 7.30" so far this month, which is 4.43" above normal. Still shy of the record for the month of 11.26" set back in 1975.

1:50pm - Rainfall totals thus far... getting up there

Indian Head, MD: 1.52"

Spotsylvania, VA: 1.48"

Oxon Hill, MD: 1.43"

Quantico, VA: 0.84" 

12:37pm - As very heavy rain moves north up 95 and the BW Parkway, a new Flash Flood Warning has been issued for Howard, Anne Arundel and Baltimore Counties until 3:30pm.

12:21pm - Flooding reports are coming in from Frederick County, MD. Route 77 is closed near Owens Creek. Route 550 is flooded and closed near Creagerstown. A portion of route 76 is flooded near Mount Saint Mary's College.

12:01pm - Check out the latest satellite imagery...

Visible Satellite Image - Note the clearing to the southwest over SC

Water Vapor Satellite Loop - Purples to blues are the high cold cloud tops

Infrared Satellite Loop - Blues are the high cold cloud tops

11:54am -

Rainfall Potential today from HPC

11:42am - More area rainfall totals...

Indian Head, MD: 0.97"

Mount Airy, MD: 0.76"

Upper Marlboro, MD: 0.56"

Dale City, VA: 0.42" 

11:24am - A Flash Flood Warning is in effect for Frederick County, MD until 3:15pm this afternoon. They are the first to be warned as heavy rainfall has been there this morning but they also had very heavy rain Wednesday night when 2 to 3 inches of rain fell. This will make that area much more prone to flooding today.

11:01am - The heaviest rain in the D.C. area is just south of the Beltway and will be moving into D.C. in the next 20 to 30 minutes. Another pocket of very heavy rain will move along the eastern part of the Beltway and get to 495 and Route 50 in about 20 minutes or so. Rainfall rates are on the order of an inch an hour.

10:57am - There is a report I saw from Accuweather that cars were stranded in downtown Columbia. Our WeatherBug netwrok has a station there that has 3.15" of rain and it appears that it occurred in a few hours.

10:50am - For starters, let's see where the heaviest rain has been so far today...

Clarksburg, MD:  0.90"

Germantown, MD:  0.84"

Spotsylvania, VA:  0.91"

Patuxent River, MD:  0.56"

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