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Posted at 3:00 PM ET, 08/28/2009

PM Update: Periods of Rain Lead to Flood Threat

By Ian Livingston

Danny to pass east of area Saturday; Nicer Sunday

* Flash Flood Watch Thru Tonight for Metro Area & North (Map) *
* Outside Now? Radar, Temps & More: Weather Wall | SkinsCast *
* Is Danny a Threat to the East Coast? | Track Danny | Beach Forecast *

The midday batch of rain that earlier prompted Flash Flood Warnings for several of our northern counties has mainly moved through, but more is advancing from the south. A front draped over us and only slowly drifting north should keep the showers and storms going. Look for soupy conditions and periods of rain -- sometimes heavy -- to persist into tomorrow. Highs that rose to near 80 have been knocked back by the rain into the 70s in many spots, but could still recover a few degrees during lulls in the precipitation.

Monitor severe warnings issued by the National Weather Service and radar on our Severe Weather Tracking Station below. Also, comment below with conditions where you are. And scroll down for our full forecast into next week.

Severe Weather Tracking Station
Warning Text: DC | MD | VA * New: Lightning Map
Radar: Latest D.C. area radar loop shows movement of precipitation over past two hours. Powered by HAMweather. Refresh page to update. Click here to see radar bigger.
LWX Warnings
Warnings: Severe alerts from National Weather Service. Updates w/o refresh (most browsers). Hint: Alert on map? Click matching label in key for details.

Through Tonight: Additional batches of rain -- sometimes heavy -- are possible this evening, and they could contain some lightning and thunder as well. Rain chances continue overnight, but we should see lulls in the action too. Dew points headed for the 70s will keep us pretty warm. Lows should fall to the upper 60s in the suburbs to the lower 70s downtown.

Tomorrow (Saturday): We should stay mostly cloudy through at least early afternoon with a continued chance of passing rain showers or storms. As Danny moves east then northeast of the area, clearing should begin later in the day. Some more storms are still possible during the afternoon, perhaps out of here by evening. Highs should make a run at the mid-80s.

See Camden Walker's full forecast through the beginning of next week. And if you haven't already, join us on Facebook and follow us on Twitter.

By Ian Livingston  | August 28, 2009; 3:00 PM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: Is Tropical Storm Danny a Threat to U.S. Coast?
Next: Forecast: A Few Evening Showers & Storms


Not exactly flood-inducing so far:
National 0.06"
Dulles trace
BWI 0.02" (since this morning)

Posted by: CapitalClimate | August 28, 2009 4:10 PM | Report abuse


Unfortunately (or fortunately, if you're a fan of rain), weather occurs elsewhere besides at the 3 major airports -- Andrews Air Force Base in Camp Springs, Md., has recorded 1.89" today so far.

Posted by: CapitalWeatherGang | August 28, 2009 4:43 PM | Report abuse

And 0.00 in NW Montgomery County.

Posted by: MKadyman | August 28, 2009 5:27 PM | Report abuse

CWG staff: What geological, physical, and/or man-made obstruction causes the infamous 'DC split'? This morning's radar looked so promising, bringing the heavy rain up the Potomac toward National Airport and downtown. It then split (yet again), dousing Andrews and points east as well as locations far to the north.

The same thing occurred last night. I was dismayed to watch the distant lightning without a drop of rain whatsoever in Michigan Park. So far today, Children's Hospital has recorded only .12, and latest radar suggests this 'training' to the east will occur yet again this evening.

This is incredibly disheartening to those of us in the city who love rain!

Tom in Michigan Park, DC

Posted by: TominMichiganPark | August 28, 2009 6:05 PM | Report abuse


I don't have a great explanation. I don't have data that proves it's a real phenomenon...although, anecdotally, it does seem to happen a lot.

Posted by: CapitalWeatherGang | August 28, 2009 6:44 PM | Report abuse

I think at any given location you see a split from time to time especially if you're always paying attention. When weather is coming from predominantly the west it seems maybe easier to explain given downsloping/rainshadowing off the Appalachians. Solid lines that develop west of them tend to break up more often than in some places so it gives a greater chance of a "split". This is discussed all the time on a weather board I frequent and no one really has a solid answer (even ethanol use for gas on the i95 corridor has come up). I'd say it's partly psychological.

Posted by: Ian-CapitalWeatherGang | August 28, 2009 6:55 PM | Report abuse

Still waiting for the flash floods here in the Baileys Crossroads area, though we did get about a half-hour of rain, less than five minutes of it heavy, around 1 PM or so.

Most of our real flooding this time of year comes with named storms...Eloise, David, Floyd, Fran, Ivan, Isabel... I'm getting rather skeptical about Danny; as I posted earlier this week, it's rather hard to get excited over a tropical system named for a yogurt!

Posted by: Bombo47jea | August 28, 2009 7:50 PM | Report abuse

Oh, dances were affected for me, as it was a rare Friday night without a dance at Chevy Chase, though the Dulles Hilton has a swing dance tonight. [BTW I've heard that attendance there on Friday nights is on the order of 60-100 or so.]

Posted by: Bombo47jea | August 28, 2009 8:00 PM | Report abuse

The airports may have been skipped, but I really had 0.43" in West Springfield as of 9pm. I do find that hard to believe, but we had very heavy, large streaking drops for about 20 I guess it must be real.

Posted by: bikerjohn | August 28, 2009 9:32 PM | Report abuse

I was on the beltway from 66 to 270 around 1-2pm. It rained non stop for about the hour it took me to get to rockville (montrose road exit). Cars were going really slow and you could see the water rushing down those side gutters on the highway. Water was pooled in some side areas of the beltway. Cars were plowing into the pooled water in some areas and splashing the opposite side.

I get home to Arlington later and my rain gauge got .25 inches or so.

Posted by: jojo2008 | August 29, 2009 12:29 AM | Report abuse

Greetings from NC. It will be interesting to see what has (or has not) happened in Prince William County weather-wise since we've been gone. Calabash/MB has been a blast -- got caught in some downpours today as we toured UNC Wilmington with our daughter. I'm sure that was more the frontal boundary than Danny. You all were a great source of info so we could prepare for our trip home tomorrow. Hope tomorrow is as uneventful for DC weather as Danny was down here.

Posted by: southbridgemom | August 29, 2009 12:47 AM | Report abuse

And when those non-big-three stations contradict your temperature forecasts, you deny their accuracy. Maybe you need to get your story straight.

How many flash-flood LSRs were issued for anywhere closer than Carroll and Harford Counties?

Posted by: CapitalClimate | August 30, 2009 1:46 PM | Report abuse

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