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Posted at 5:00 AM ET, 04/20/2008

Forecast: Lots of Rain

By Jason Samenow

*Flood Watch in effect for metro area through late tonight*
*Flood Warning in effect for eastern Loudoun until 3:15 p.m.*

Hopefully, everybody got their fill of sun yesterday because it's going into hiding for the next 72 hours or so. Clouds and rain arrive in earnest today, with heavy bursts of rain possible. The rain will decrease in coverage and intensity some time tomorrow, but the cool, damp pattern probably won't relent until Wednesday.


Rain, chance of thunder. 60-65. Slow-moving bands of rain are likely to pivot through the metro area throughout the day. A few thunderstorms may be embedded within these rain bands and there is a slight risk (20%) of small hail in storms that develop during the afternoon. Daytime rainfall amounts should be around 1 to 1.5 inches with greater amounts possible towards the mountains (2" or so) where there may be some flooding.

Overnight, periods of rain will continue, with areas of moderate and heavy rain especially west of the metro area, where the flood risk is highest. Another 0.5 to 1 inch of rain is possible (with some locally higher amounts and flooding, especially southwest of the metro area). Temperatures will dip down into the mid to upper 50s.

Confidence: Medium-High

Keep reading for the forecast for forecast into early next week...


Scattered showers. Near 60. The area of low pressure responsible for today's rain will drift southeastward taking the steady rain along with it. Nonetheless, the departing low could still spin up some bands of showers over the metro area, although they should be somewhat intermittent and decreasing in number by late in the day. A stiff wind off the ocean will keep it cool, with highs only near 60.

Monday night will be cloudy and cool with patchy drizzle. Lows will drop down to 50-55.

Confidence: Medium


Easterly flow will continue Tuesday, generating clouds, morning drizzle and cool high temperatures between 60-65. Confidence: Medium

High pressure will begin to build in from the north Wednesday, resulting in increased sunshine and noticeably warmer temperatures. Highs will likely warm into the low 70s.Confidence: Medium

By Jason Samenow  | April 20, 2008; 5:00 AM ET
Categories:  Forecasts  
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Is there some web site that keeps rolling 12 month rainfall totals ( and has the associated average) for the local area?

Posted by: MDScot | April 20, 2008 8:29 AM | Report abuse

6 tenths fell in our local T-storm this morning...perfect training...I am about 7 miles SW of Dulles/Sterling NWS and they only had a absolutely poured and looking at the radar, the cell went right over my head. And thats just the beginning. Radar is very impressive heading up 95 at us. No baseball today.

Posted by: Dulles ARC | April 20, 2008 8:48 AM | Report abuse

Thunder in the west end of alex at 849 am

Now raining quite hard.

Posted by: pvogel88 | April 20, 2008 8:55 AM | Report abuse

Heavy downpour and thunder in Merrifield.

Posted by: ~sg | April 20, 2008 9:07 AM | Report abuse


There's a pretty good website on the National Weather Service. It only goes back 6 months though.

Posted by: Chris R. | April 20, 2008 9:14 AM | Report abuse

I was terribly disappointed to wake-up this morning in Calvert County to a beautiful sunrise.

As of 9:10 am EDT, the sun is shining brightly with some white clouds apparent only to the west.

Will southeastern Maryland and the eastern shore miss the soaking that we too are craving?

Posted by: Feeling Left Out | April 20, 2008 9:14 AM | Report abuse

First clap of thunder this year in Lake Ridge this morning. WOOHOO!!!

Pouring for the next two days. The weather gods love me I think. :)

Radar is impressive this morning. VERY defined line determining where you get dumped on and where you get a sunny day, as Feeling Left Out said.

Posted by: weatherdudeVA (Lake Ridge) | April 20, 2008 9:34 AM | Report abuse

Feeling Left Out -- Calvert County should get in on the action as the day goes on and into tonight and tomorrow. But rainfall totals there, and Southern Maryland in general, will probably be less than the District and points west, southwest and south (and southeastern Virginia), where the heaviest precipitation is likely to fall. East of the Bay, precip will most likely be lighter and more intermittent, especially the further north you are.

Posted by: Dan, Capital Weather Gang | April 20, 2008 9:41 AM | Report abuse

Cells developing right overhead in NW Montgomery. Already .40 inches with frequent lightning and thunder. Sterling radar down.


Posted by: JT | April 20, 2008 9:58 AM | Report abuse

The Leesburg Home and Garden Show is to likely be a rainout today but the wetaher is just wonderful and the lawn is actually green.

Posted by: GREG | April 20, 2008 9:59 AM | Report abuse

Plenty of sky action in the Eastern Panhandle this morning, starting at 6:00. Enough lightning and boomers to send me scurrying to a downstairs bedroom. Would love to send it all to Dude, who likes this stuff! But the rain is wonderful. The hills are so green, the horse farm near me looks like Ireland.

Posted by: tinkerbelle | April 20, 2008 10:11 AM | Report abuse


Well it looks like Baby ARC doesnt mind the thunder. Thats a good thing...if any of you have read Marley and Me, you'll know what I'm talking about. I've been worried about the thunder since she was born...this is her first real day of thunderstorms and she's sleeping like a baby. Right at an inch of rain here in the LoCo bootheel. We're going to crack 2 inches easy - so sweet! Now we just need to keep this decent pattern up for about 4 more weeks and then our daytime pop up storms need to hit a little better than last year. Drought is on the way out.

Posted by: Dulles ARC | April 20, 2008 10:23 AM | Report abuse

Some high res models pumping out 6-7" for Loudon county.

Posted by: Ian, Capital Weather Gang | April 20, 2008 11:30 AM | Report abuse

1.42 inches so far in NW Montgomery.

Posted by: JT | April 20, 2008 11:55 AM | Report abuse

It started raining big time around nine this a.m. in Rosslyn -- and that's fine by me. Nothing I like better than sleeping in on a rainy Sunday morning!

Posted by: Andrew | April 20, 2008 11:57 AM | Report abuse

Whoa. Just looked at the east coast radar and this thing is training right overtop of the western suburbs with precip as far down as the North Carolina border. No rain at all on the eastern shore or western Md.

Posted by: JT | April 20, 2008 11:59 AM | Report abuse

Just cloudy here in NYC. Tops of the skyscrapers are in the fog.

Posted by: Kalorama Park | April 20, 2008 12:12 PM | Report abuse

Already received one inch in Stafford County as of 1:20pm.

Posted by: David A. | April 20, 2008 1:21 PM | Report abuse

.71 so far here today. Nice breaks in the precip--even saw a bit of sun about 30 minutes ago. Seems like areas west of DC are getting hit the hardest...

Posted by: steve takoma park md | April 20, 2008 1:35 PM | Report abuse

Big batch of rain about to move into DC.

Posted by: Ian, Capital Weather Gang | April 20, 2008 2:10 PM | Report abuse

Twenty minutes of thunder and downpour here in Mount Vernon, now its drizzle and the birds are singing again.

Posted by: Etta | April 20, 2008 2:25 PM | Report abuse

Another heavy band is moving through southern McLean; heard the loudest crack of thunder I've heard in years. I recorded 0.97 inches before the latest heavy band of rain.

Posted by: Peter L | April 20, 2008 2:31 PM | Report abuse

Strong rains and occasional lightning and thunder in downtown Bethesda. These last two lightning bolts produced loud and close thunder. I suppose I should move away from the window.

Posted by: Anonymous | April 20, 2008 2:43 PM | Report abuse

I'm now at 1.51" in southern McLean after that last heavy band.

Posted by: Peter L | April 20, 2008 3:16 PM | Report abuse

Sorry, I left off my "name" on that Bethesda comment.

Posted by: Murre | April 20, 2008 5:25 PM | Report abuse

Lots of rain today... not much this evening, though, apart from a heavy shower that lasted about 5 mins.
Looks like we could get back into the action overnight here in LoCo as the low drifts eastward.
It's drifting eastward, right? I'm feeling left out.

Posted by: Model Monkey | April 20, 2008 8:12 PM | Report abuse

Ian's report is the storm I tracked on channel 7's radar yesterday afternoon.

There were also a couple of tornadoes in this batch of weather, EF-0 and EF-1. Looks as though the EF-1 tornado in Chillum lifted the roof off a building at the Peters Seventh Day Adventist School.

Posted by: El Bombo | April 21, 2008 10:52 AM | Report abuse

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