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Posted at 3:30 PM ET, 09/27/2010

PM Update: Periods of storminess into the night

By Ian Livingston

Areas of flooding also a concern

* Flash Flood Watch for entire region | Dr. Gridlock *
* Why the tornado risk? | Hefty rainfall possible | NatCast (updated) *
* Outside now? Radar, lightning, temps & more: Weather Wall *

It's pretty muggy out there today and when you mix in a lot of atmospheric action above the surface, we're under the risk of some heavy rain and even isolated severe thunderstorms. So far, the action today has been rather scattered and that may continue, but many spots have seen at least periods of heavy rain and by the time this is all done, 1-3" of rain is likely in most spots, with isolated 3-5" amounts.

Through Tonight: Keep an eye on CWG when home or an ear to local radio when out the rest of the day and into the night. There may be breaks in activity into the evening, but additional rounds of showers and thunderstorms are likely through the overnight. The strongest activity -- especially late tonight -- may produce strong winds and even an isolated tornado. Strong flow from the south means temps won't fall overnight. Look for lows to mainly hold where they are now -- in the low-to-mid 70s.

Tomorrow (Tuesday): We may deal with a line of potentially severe weather very early, perhaps before sunrise or into the morning commute. As with today, there will be a risk of isolated tornadoes with this activity. The risk of showers should diminish as the day wears on and we could see partly cloudy skies during the afternoon. Highs should reach the upper 70s and lower 80s.

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

By Ian Livingston  | September 27, 2010; 3:30 PM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: Flood warning for E Montgomery and W Howard Co
Next: Natcast: Nice weather window


Is DC good up until about 6 p.m. in terms of heavy rain?

Posted by: JerryFloyd1 | September 27, 2010 3:37 PM | Report abuse

Just walked the dog, the humidity was horrid, also didn't help that the sun came out. Dry slot over Spotsy cont., now raining N,E,S & W of me. Looks like this dry slot will cont. for awhile. I've almost had enough rain 2 have a puddle form.

Posted by: VaTechBob | September 27, 2010 3:41 PM | Report abuse


I would say an hour to 90 minutes before the next big band starts to get close... but a shower or two could move through in the interim. You may be OK until 6 p.m. -- but that might cut it a little close.

Posted by: Jason-CapitalWeatherGang | September 27, 2010 3:48 PM | Report abuse

We haven't gotten enough to get your hair wet in NW Montgomery.

Posted by: MKadyman | September 27, 2010 4:13 PM | Report abuse

Looking at the regional radar now. Looks like there is a huge amount of rain coming towards the DC region from the Carolinas.

Posted by: FH59312 | September 27, 2010 4:26 PM | Report abuse

Thanks, Jason. Hopefully I'll make to where I'm going before the deluge.

Really feels like tropical air outside, even though it's not that warm, esp. compared to the recent thermal temps.

Posted by: JerryFloyd1 | September 27, 2010 4:32 PM | Report abuse

That dry slot looks awfully big over DC right now. Can they get 5 in tonight at Nats Park?

Posted by: TuscanRed | September 27, 2010 4:32 PM | Report abuse


Funny you should ask. NatCast was updated just a couple minutes before your comment. Link is at the top of this post.

Posted by: CapitalWeatherGang | September 27, 2010 4:40 PM | Report abuse

LOL. Great minds think alike I guess. Thanks for the heads up. At least it is more optimistic than this morning.

Posted by: TuscanRed | September 27, 2010 4:43 PM | Report abuse

@FH59312, take a look at the National Mosaic radar; there's stuff streaming from the NE Gulf of Mexico all the way to southern Virginia

One nice thing about the moisture; at least as of this a.m. (knock on wood), it's cut back on the Invaders from Stinkbug Mars.

Posted by: JerryFloyd1 | September 27, 2010 4:46 PM | Report abuse

Looks like areas E of 95 will get most of the rain. I'll b surpised if I get more than .25" of rain 2night. Rain cont. 2 split mostly 2 the E with lesser amounts 2 the W.
Originally my area was in the 2-3" rain section, now looks like maybe a .5" area.
Envious of those who will actually get some much needed rain.

Posted by: VaTechBob | September 27, 2010 5:18 PM | Report abuse

@VaTechBob, it does indeed appear as if the rain shield is shifting eastward all the down to Florida. Really too bad, because the most severe drought is in agricultural areas to the west and NW of DC.

Posted by: JerryFloyd1 | September 27, 2010 5:28 PM | Report abuse

If I didn't know better (and this were two months later), I'd blame this on the usual and customary DRY SLOT-ITIS that our area tends to suffer from whenever SNOW is in the forecast. Geez, I wish at least SOME of that rain would come our way...

Posted by: VAStateOfMind | September 27, 2010 5:37 PM | Report abuse

I was dubious from the start when 2-3" rainfall was predicted 4 my area. The prec. has had an ENE trend since last night. Eastern Va. & Md. will get most of this rain. Reminds me of some of the winter snow 4casts, most of the time they r over estimated, last yr being the exception.

Posted by: VaTechBob | September 27, 2010 5:37 PM | Report abuse

There are some fabulous cloudscapes out there this afternoon. Very tropical stormish looking.
So far this great big rain event has been a great big fizzle here in Centreville. Less than a quarter inch in the rain bucket.

Posted by: FIREDRAGON47 | September 27, 2010 5:52 PM | Report abuse

The sky does have cool layering to it, tonight. Everyone keep an eye to the sky tonight. Watch for downpours and flooded roadways.. .be very careful!

Posted by: Camden-CapitalWeatherGang | September 27, 2010 6:35 PM | Report abuse

Dome over NW Spotsy cont. Calling the flood warnings a bust. Far E Va. will get most of the rain. Sun will b out by noon 2morrow with temps in low 80's.

Posted by: VaTechBob | September 27, 2010 6:38 PM | Report abuse

Lots of very low, fast moving dark clouds here in Silver Spring but still no rain. All bark and no bite (thus far anyways!).

Posted by: CuseFan07 | September 27, 2010 6:46 PM | Report abuse

It was a dark and stormy night...even if there wasn't much rain involved. (sigh)

Posted by: --sg | September 27, 2010 9:01 PM | Report abuse

I can't believe it's almost October and I had no choice but to kick the AC on tonight. So what does all this do to fall foliage?

Posted by: SPS1 | September 27, 2010 9:20 PM | Report abuse

We must have had the inch-an-hour band for one hour just before I got back to Front Royal. Tested the new retention ponds a little bit: upper one leaked, lower one held (50 gallons maybe?) I have a lot of digging and patching to do in the upper pond, the lower is only supposed to be for severe situations plus some permanent water.

Posted by: eric654 | September 27, 2010 9:47 PM | Report abuse

Already looking like a bust for some areas west of DC. Here at Dulles we had what half inch so far, and radar map is not showing much promise AT ALL. Much needed rain is hard to come by, even when the dance crowd is not complaining.

Posted by: LoudounGeek | September 27, 2010 9:58 PM | Report abuse

Rain amounts have underperformed in S. Arlington. I had .35" or so this afternoon. Maybe some sprinkles since then, but nothing to bump that up much higher.

Posted by: jojo2008 | September 27, 2010 10:01 PM | Report abuse

I'm with vatechbob and Loudoungeek ... all we've gotten is half an inch. But I'm hanging on to hope. We had an impressive storm sweep by around 7 p.m. but not a drop of rain ....

Posted by: weathergrrl | September 27, 2010 10:07 PM | Report abuse

The Delmarva is doing very nicely on the rain and it appears that southern Md got a decent soak for a while. But in the District, we're still thirsty.

Posted by: JerryFloyd1 | September 27, 2010 10:14 PM | Report abuse

Think it's time 2 cancel the flood watches & warnings. Drought will cont. for most of the area W of 95.
Tomorrow will have clearing skys & highs of 83-85. Look 4 dry weather 2 cont. Maybe a few scattered showers on Thurs.
Never bought into all the rainfall predictions, radar since last nite had most of the rain staying 2 the E.

Posted by: VaTechBob | September 27, 2010 10:21 PM | Report abuse

I believe we should have more coming our way in the next 24 hours... hopefully all of our thirsty soil will get a drink. Don't throw in the towel quite yet!

Posted by: Camden-CapitalWeatherGang | September 27, 2010 11:21 PM | Report abuse

Camden, I think VaTechBob has a point. Almost all of the rain (and it was a lot) is by-passing the D.C. area and going up and east of Chesapeake Bay. The chances of significant rain (and flooding) in the D.C. area seem to be lowering each hour.

Posted by: MMCarhelp | September 28, 2010 12:03 AM | Report abuse

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