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Posted at 2:00 PM ET, 08/ 1/2009

Forecast: Staying Sticky, Slight Storm Chance

By Jason Samenow

* Northwest Sizzles, Texas Withers | A Good Time to Watch Clouds *
* Radar, Temps, and More: Weather Wall *
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Today: Partly sunny, 20% chance of a p.m. t'storm. Near 90. | Tonight: Partly cloudy, 20% chance of t'storm. 67-72. | Tomorrow: Partly to mostly cloudy, 40% chance of showers and t'storms. 85-90. A Look Ahead


Though we were able to mostly escape high humidity for a good part of July, we won't be able to avoid it as we begin August. Very warm and muggy conditions remain in the forecast through at least Tuesday along with the slight chance of afternoon/evening thunderstorms. We can use the rain, as we finished July with just 1.07" (at Reagan National Airport), over 2.5" below average.

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

Today (Saturday): Weak high pressure attempts to dry us out after yesterday's storms, but flow from the southwest in the afternoon will pump in more warm and humid air. So it will only be marginally less humid than yesterday, and we'll have a 20% chance of a thunderstorm late in the afternoon or in the evening. Highs should reach about 90. Confidence: Medium-High

Probability: 20%
Coverage: Isolated

Tonight: A slight (20%) chance of a thunderstorm remains in the forecast overnight. Otherwise, skies will be partly cloudy, with muggy overnight lows in the upper 60s (cooler suburbs) and low 70s (downtown). Confidence: Medium-High

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

A thunderstorm moving into Tysons Corner yesterday afternoon. By CWG photographer Kevin Ambrose

Tomorrow (Sunday): Conditions will be pretty similar to today, with very warm and humid conditions. Highs will range from 85-90 degrees, depending on the amount of sunshine, which will be variable. Thunderstorm chances will be higher than today -- around 40% -- with somewhat greater chances (50%) west of town. Some places could also see a shower in the morning (30% chance). Confidence: Medium-High

Tomorrow Night: Partly cloudy and humid, with a 1-in-4 chance of a thunderstorm, especially before midnight. Lows will range from 68-72 (suburbs-city). Confidence: Medium


Both Monday and Tuesday will feature more characteristic D.C. summer weather: partial sunshine, humidity, a chance of p.m. storms, and highs in the upper 80s and low 90s. Overnight lows will be in the upper 60s and low 70s. Confidence: Medium-High

By Jason Samenow  | August 1, 2009; 2:00 PM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: PM Update: Storms Depart, Quiet Night Ahead
Next: Forecast: August Bringing Mugginess & Storms


A tornado was confirmed in Frederick County (Ijamsville) yesterday. Carroll damage still being investigated.

Posted by: Ian-CapitalWeatherGang | August 1, 2009 9:50 AM | Report abuse

Wear that sunscreen today - UV is already approaching high levels at 10am!

Posted by: Camden-CapitalWeatherGang | August 1, 2009 10:02 AM | Report abuse

I had hoped to mow the grass this afternoon but we have had several heavy downpours during the past hour or so in Oakton. I checked radar and it appears to be quite isolated, just over my area.

Posted by: Kevin-CapitalWeatherGang | August 1, 2009 2:29 PM | Report abuse

Sure wish we could get back some of that nice dry Continental Polar air...Do we really have to wait until after Labor Day for relief???

BTW I tried to post a response on my forecasting methods yesterday and my computer screen froze on me!!! Basically I predict from what I'm seeing on the radar and in the sky, and also what I'm hearing from the TV weathercasters. I particularly like WGN and Tom Skilling for coverage to our west [where so much of our weather comes from] and can get rather irritated on the rare occasions when they butt out their noon [1 PM] newscast for some rare early baseball game. Seems a handful of Cubs and White Sox games out there begin at noon CDT, for whatever odd reason I don't know. Most of their day game broadcasts begin at 1 PM CDT, 2 PM our time.

WGN is supposed to have a newscast at 6:30 PM our time, but all I ever get is some old rerun show at that time. Is there a programming difference between WGN-America and WGN-local???

Posted by: Bombo47jea | August 1, 2009 2:44 PM | Report abuse

NWS has confirmed the Carroll County damage as a tornado as well. EF0 in Gamber.

Posted by: Ian-CapitalWeatherGang | August 1, 2009 4:06 PM | Report abuse

Several torrential downpours over the last 30-40 minutes here in Calverton. Seems to be very isolated over us.

Posted by: ana_b | August 1, 2009 4:31 PM | Report abuse

I was wondering where that static on the AM band was coming from. Nothing that I can see on radar.

Posted by: MKadyman | August 1, 2009 4:49 PM | Report abuse

Amazing storm around 5-5:30p in Springfield!!

15 cars between Franconia/Springfield metro
and Rolling Rd pulled over during the rain. Visibility about 30-50 yards. Fast moving water formed a wave flowing down the side of Franc/Spring Pkwy.

We received .8" in less than an hour.

(We received .08 Sunday to Friday)

Posted by: bikerjohn | August 1, 2009 7:15 PM | Report abuse

Very heavy rain and small hail here in Culpeper County!

Posted by: RWJ1990 | August 1, 2009 10:50 PM | Report abuse

No rain here today, but I just heard some thunder.

70.3F in the Blue Ridge Mtns

Posted by: spgass1 | August 1, 2009 11:02 PM | Report abuse

In other news, I thought this was a somewhat interesting article from Business Insider on 10 Important Skeptics of Human-Caused Global Warming.

Posted by: spgass1 | August 2, 2009 12:12 AM | Report abuse

That cell moving NE out of fauquier looks angry. Any word on what it's doing?

Posted by: ParkerGP | August 2, 2009 2:48 AM | Report abuse

@ParkerGP - It's probably the same one that just woke me up here in Lake Ridge. No rain yet, but there's thunder.

Posted by: meta2 | August 2, 2009 2:59 AM | Report abuse

Vienna dodged the rain this afternoon, but the late night cell is clobbering us. Raining cats and dogs and very loud thunder. As I type, it's letting up.

Posted by: xathros | August 2, 2009 3:09 AM | Report abuse

>That cell moving NE out of fauquier looks angry. Any word on what it's doing?

Yes. It's waking me up.

Posted by: Murre | August 2, 2009 3:43 AM | Report abuse

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