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Posted at 10:50 PM ET, 03/12/2010

PM Update: Periods of heavy rain into Saturday

By Capital Weather Gang

Flood risk increases by late tomorrow

* Flood Watch continues through Saturday evening *
* Coastal Flood Advisory for the Potomac River & Chesapeake Bay *
* Significant flood threat | Frederick road closures | CWG T-Shirts! *
* Outside now? Radar, temps & more: Weather Wall | Traffic *

Steady showers moved out of the area this morning, leaving scattered activity and drizzle behind as highs were kept to the low-to-mid 50s. Most spots have seen around .5-1" of rain since last night. The brunt of this storm arrives tonight. The good news is the latest data suggests the heaviest and steadiest rain may let up by midday tomorrow, and that storm totals through the weekend could be closer to the low end of the expected 2-4" rather than the high end.

Radar: Latest regional radar shows movement of precipitation over past three hours. Powered by HAMweather. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

Through Tonight: Scattered showers early give way to steadier and heavier rain as the night progresses. In the hours around midnight, some intense activity should move into the area. Most spots should pick up another .5-1"+ overnight. Lows mainly in the upper 40s to around 50. Winds increase through the night and should gust toward or past 35 mph by morning.

Tomorrow (Saturday): More rain, heavy at times, lasts into Saturday morning. By late morning or early afternoon, the rain should diminish into scattered showers. But the risk of flooding increases later tomorrow into Sunday as rivers rise. Highs tomorrow should range from the low-to-mid 50s. Winds will be strongest in the morning and should weaken a bit in the afternoon. A chance of scattered showers continues tomorrow night with lows in the upper 40s.

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

By Capital Weather Gang  | March 12, 2010; 10:50 PM ET
Categories:  Forecasts  
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Next: Forecast: Steady rains to subside, still showery


Lower amounts=awesome news

Posted by: steske | March 12, 2010 3:55 PM | Report abuse

...But it's still a very nasty weekend!

Topper Shutt just announced that a new tropical cyclone "Anita" just formed off Brazil in the South Atlantic. Before 1995 or so, tropical systems NEVER used to form down there...and now there have been THREE in the past 15 or so years!...More evidence for Global Warming???...or just maybe better satellite resolution? The problem with a satellite observation answer is that we've had weather satellites observing the Earth ever since TIROS I in the early 1960's and they never picked up any South Atlantic tropical cyclones during much of the twentieth century. Based on what we're observing nowadays there should have been up to 5 or so South Atlantic tropical systems during the second half of the 20th Century.

Posted by: Bombo47jea | March 12, 2010 7:32 PM | Report abuse

DCA has not updated their rainfall thus far since 6:52am this morning:

Very frustrating.

Posted by: jojo2008 | March 12, 2010 9:36 PM | Report abuse

You can get the numbers from Weather Underground or through the raw obs outputs. Up to .61 as of last hour.

Posted by: Ian-CapitalWeatherGang | March 12, 2010 10:30 PM | Report abuse

Whether snow or rain, these are some intense systems we've had. These potential rain totals are so impressive.

Gotta love the weather! But I will say, as a metro commuter running around DC all day, all I could think about was getting home!

Today was the first day since the Big One in February that I've seen my entire front yard. Last night, POOF - the rest of the snow disappeared when that front moved in during the wee hours. But up until then, it hung on and on.

Posted by: bobosnow | March 12, 2010 10:48 PM | Report abuse

Anyone having fun in this breezy rain??

Posted by: Camden-CapitalWeatherGang | March 13, 2010 1:10 AM | Report abuse

@Camden, oh yes, it's totally AWESOME! Not really lol. I am having fun with the VP2 though. Watching everything happen live, and comparing it on the CWOP/Findu database, is really interesting. The Barometer is falling quickly right now, from 29.567 in. downward. The winds are really picking up as well. I've recorded 0.86" of rainfall from this system so far.

There's a Weatherbug station nearby that is picking up greater wind speeds than I am, but they've also been collecting about half as much rainfall as a result.

Posted by: TheAnalyst | March 13, 2010 2:09 AM | Report abuse

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