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Posted at 11:00 PM ET, 06/10/2009

Storms Dump Heavy Rain, Moving Out

By Ian Livingston

Localized flooding a concern; Unsettled Thursday

* Outside Right Now? See Radar, Temps & More: Weather Wall *

11 p.m. update: Flood warnings there were in effect have been canceled. Showers and storms with heavy rain are now exiting the District and impacting the eastern suburbs as they slowly diminish. These storms should gradually move away from the metro region in the next hour. Remember to avoid areas of standing water on roads.

There were earlier reports of road flooding in Md. near 495 and parking garages flooded at the University of Maryland.

Later Tonight: The severe weather threat should taper off after sundown, but additional showers or storms are possible afterwards, mainly before midnight. Any showers or storms that form will have the potential to produce locally heavy downpours. Lows? Mid-to-upper 60s.

Tomorrow (Thursday): It looks like another active one weather-wise. An isolated shower or thunderstorm is possible during the morning, but the main focus should once again be on the afternoon and evening when we could see another wave of storms (some severe). Highs should hit the low 80s as humidity remains.

See Dan Stillman's full forecast through the weekend. And if you haven't already, join us on Facebook and follow us on Twitter.

Booming Thunder: Yesterday's storms produced loud thunder according to many comments here on the blog. The BBC's quick answer about loud thunder is that volume "is partly determined by the length of the discharge," so longer strikes will be louder than shorter ones. Cloud-to-ground lightning is often louder because the vertical strike is a fairly straight line while cloud-to-cloud lightning is more often forked -- forks cause the noise to come in parts (or as a rumble) because different segments of the bolt are different distances (also an important factor) from the listener.

While on the subject of thunderstorms, check out this cool time-lapse of yesterday's afternoon storms from the Post.

By Ian Livingston  | June 10, 2009; 11:00 PM ET
Categories:  Forecasts  
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Next: NatCast: Storms Could Upset the Game


Radar indicating upwards of 3" of rain has fallen over a short period in northern Fairfax County this afternoon.. any reports from the area?

Posted by: Ian-CapitalWeatherGang | June 10, 2009 6:01 PM | Report abuse

Against my better judgment I'm still going to Camden yards to see my beloved Mariners. This should be good...

Posted by: Brian-CapitalWeatherGang | June 10, 2009 6:05 PM | Report abuse

Ian, Flash Flood Warning now out for the Moco/Fairfax/Loudoun 3-corners area. That's one big and slow moving cell...

Posted by: JJones-CapitalWeatherGang | June 10, 2009 6:11 PM | Report abuse

SPECTACULAR flooding in University Park, MD...cell seems to have popped right on top of us and hasn't moved.

Posted by: mookie2 | June 10, 2009 6:54 PM | Report abuse

To those in areas where these storms set up, localized flooding has been reported, as well as road closures and bad travel. I would suggest at this point, if you are north of the beltway, to stay inside. Heavy rainfall rates to already saturated ground is going to cause major issues with downed trees, powerlines, and street & creek flooding.

Posted by: JJones-CapitalWeatherGang | June 10, 2009 6:56 PM | Report abuse

In University Park, a strong thunderstorm has not moved away at all in the past hour. Pretty amazing. Lots of lightning and small hail.

Posted by: BShea82 | June 10, 2009 7:06 PM | Report abuse

Clouds developing over my apartment from the northwest look a lot more ominous than radar indicates. Really beautiful and intense!

Posted by: LaurainNWDC | June 10, 2009 7:21 PM | Report abuse

Anyone know what the weather is like in Alexandria, down by Seminary Road?

Posted by: zim94 | June 10, 2009 7:52 PM | Report abuse


Cloudy and Darky. No real rain

Posted by: JJones-CapitalWeatherGang | June 10, 2009 8:25 PM | Report abuse

Centreville VA - Yay, it's raining steadily again here in western Fairfax county. The 16+ inches we've received since the middle of April just isn't enough.
A few grumbles of thunder in this one but so far nothing like yesterdays fireworks. Looking at the local radar though he next 30 minutes should be interesting.

Posted by: FIREDRAGON47 | June 10, 2009 8:29 PM | Report abuse

West Springfield rainfall total for Tuesday midnight to midnight= 1.11"

We have ducks living in an apartment's front yard nearby.

Posted by: bikerjohn | June 10, 2009 8:30 PM | Report abuse

Amazingly so far, inside the Beltway in Annandale, we've only gotten sprinkles.

Zim94, I'm about five miles due west of Seminary Rd. I hear distant thunder in my west and continual fire engine sirens screaming down Lil River Trnpk.

Sorry to hear about MD. I can attest that drivers, who've tried to drive through water have drowned in Houston. And no, the autopsies never showed alcohol nor drugs. What happened, each time, was their electrical systems failed, and the drivers were unable to roll down their windows. The water pressure, naturally, prevented them from opening their doors. It only takes a few minutes to drown - rarely long enough for others to notice and come to your aid. One of the death-cars was a late model BMW, so you can't count on a good car seeing you through. If you absolutely must risk it, first please roll down ALL your windows and good luck.

Posted by: jhbyer | June 10, 2009 9:12 PM | Report abuse

Northern Prince William, near Hwy's 15/50 has received very heavy rainfall, est in excess of 3 inches in less than an hour. Local creeks are over the banks, there is flooding on some roads. Storm has passed over, hopefully there will be runoff over night. Right now the ground is under alot of standing water.

Posted by: silencedogoodreturns | June 10, 2009 9:18 PM | Report abuse

Got absolutely tattoed with rain here in Ashburn an hour or so ago. Hardest it's rained all year, and that's saying something.

I've lived in this area for 18 years, and I can't remember a spring/summer like this.

Posted by: ThinkSpring | June 10, 2009 9:23 PM | Report abuse

We've got thunder, lightning, and steady rain here in Lake far the rain is nothing like the monsoon-like conditions everyone else has described.

Posted by: meta2 | June 10, 2009 9:31 PM | Report abuse

It's been pouring for an hour here in Darnestown, still is at 9:45 pm

Posted by: curtmccormick | June 10, 2009 9:44 PM | Report abuse

Spoke too soon. There's a curtain of rain outside my window.

Posted by: meta2 | June 10, 2009 9:47 PM | Report abuse

Heavy smacking rain in West Springfield.

Posted by: bikerjohn | June 10, 2009 9:50 PM | Report abuse

Heavy rain for the past five minutes in Silver Spring. We already had a goodly amount of rain from the west side of the storm that drenched College Park. Yeesh.

Posted by: Murre | June 10, 2009 10:02 PM | Report abuse

in college park, md it has been raining none stop buckets since 6. Also lots of standing water (two lanes worth!!!) on 193 and that was 3 hrs ago, so i can only imagine what it is like now...

if outside, BE SAFE!

Posted by: HBRgal | June 10, 2009 10:03 PM | Report abuse

Whats up old timers? Been a while...but here in the LoCo Bootheel, we just got 1.6 inches tonight, adding to the .4 from yesterdays day/night another 2 inches in the last 36 hours, added to the 13 inches since it all started around May 24 or so. Sheesh...oh, and watching the 9th inning of Sox-Yanks with ARod up as the tying run. As a party to neither team, can't both of these franchises just go away for a while? I hope they both lose tonight :)

Posted by: DullesARC | June 10, 2009 10:24 PM | Report abuse

Ancient history, but just for the record, Ian - what do you consider "northern Ffx county"? My area of Reston got a sprinkle but hardly more this afternoon. However, the cell which came over between 8:30 and 9:30 was both noisy and wet - significant road flooding where storm drains could not take away the water fast enough (even with a road up a hill!)

Posted by: fsd50 | June 10, 2009 10:30 PM | Report abuse

About an hour or so again - extremely torrential/heavy rain - a bit of thunder and lightning in Lake Ridge for about 30 minutes +.

Posted by: ZmanVA | June 10, 2009 11:22 PM | Report abuse

Taxi ride to Alexandria from BWI from 6:15 to 8:00 this evening, right through the College Park cats-and-dogs show. Some serious standing water on the Beltway. Then a few miles down the road by Andrews, dry pavement.

And yes, it did take 1:45 to make that trip tonight.

Posted by: mmurphy70 | June 10, 2009 11:30 PM | Report abuse

West Springfield: Storm total from 6pm last night (to 5:30a) = 0.89" more.

Posted by: bikerjohn | June 11, 2009 5:41 AM | Report abuse

ThinkSpring, I've lived near the Beltway for 26 yrs and have never seen anything like this, either, not even in Houston from where we moved. I've never had vines trying to get inside my windows nor found dandelions under them, one leaf of which is salad for two.

Posted by: jhbyer | June 11, 2009 6:36 PM | Report abuse

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