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Posted at 10:00 AM ET, 08/21/2009

Forecast: Some Storms Before Humidity Wanes

By Camden Walker

Another warm one today, then cooler into next week

* NatCast | A/C or No A/C? | Track Hurricane Bill *
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Today: Isolated a.m. showers? 60% chance of p.m. storms. Around 90. | Tonight: 60% chance of storms. Steamy . Low-to-mid 70s. | Tomorrow: Mostly cloudy. 70% chance of showers & storms. Low-to-mid 80s. | Sunday: Partly sunny. More comfortable. Isolated storm? Mid-80s. | A Look Ahead


A cold front does battle with our summer air this weekend. As it approaches, we see good chances for showers and storms -- some could be severe -- later today into tomorrow evening. The muggy air hangs on, too. Until the cold front moves through and brings in somewhat drier air for Sunday into early next week. So hang on while we try to get rid of these dog days of August.

Today (Friday): Partly to mostly cloudy today with the chance of some isolated showers this morning. Highs around 90 as southerly breezes continue to feed in that icky, muggy air. The afternoon and evening bring better chances for showers and also storms -- around a 60% chance you'll get rained on at some point. Some storms could be severe so check back for updates, and drive safely. Confidence: Medium

Probability: 60%
Coverage: Scattered-Widespread

Tonight: Shower and storm chances continue through the night at about 60%. Don't be surpirsed if you get woken up by some overnight thunder. Light winds from the south keep the warm and sticky air in place. Lows only get down to the low-to-mid 70s in most spots. Confidence: Medium

When will the humidity take a hike? Keep reading...

A storm develops over central Maryland yesterday afternoon. Taken from Tysons Corner, Va., by CWG photographer Kevin Ambrose.

Tomorrow (Saturday): Pack that umbrella. Saturday brings the likelihood of more showers and storms, about a 70% chance throughout the day. With mostly cloudy skies, highs will be cooler than recently, in the low-to-mid 80s. But high dewpoints will keep it feeling muggy. Confidence: Medium

Tomorrow Night: A cold front fights to make it through the region, trying to bring nicer, less humid air behind it. The battle may be fought with lingering showers and storms (50% chance). Upper 60s are as low as we're likely get as skies remain mostly cloudy. Confidence: Low-Medium

Sunday: Partly sunny with -- finally -- decreasing humidity! Highs in the mid-80s won't feel too hot. But even with some clouds, the August sun is strong. So wear that sunscreen. And we can't totally count out an isolated shower or storm. Confidence: Medium


Partly cloudy Sunday night with a continuing chance of an isolated shower or storm and lows in the 60s. Confidence: Low-Medium

For Monday and Tuesday, the models have been teetering between partly to mostly sunny with no rain, or partly cloudy with at least an isolated storm chance (courtesy a system moving through the mid-levels of the atmosphere). We're leaning toward the sunnier and rain-free scenario, but it's not a sure bet. Either way, humidity should be kept somewhat in check with highs in the 80s. Confidence: Low

By Camden Walker  | August 21, 2009; 10:00 AM ET
Categories:  Forecasts  
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Nobody else is complaining about this weather? I stepped out at midnight and it felt like an oven: 88. It seems we have a 30-40-50% chance of T-Storm everyday but total precipitation only 0.1 inch since Aug 2 in Eastern Loudoun. That combined with non-stop heat is bad combination for vedgetation.
Taking the family down to Williamsburg and can definitely use a break from this pattern.

Posted by: LoudounGeek | August 21, 2009 6:44 AM | Report abuse

From which direction will today's cold front approach? And from which general direction will the storms arrive?


Posted by: NM1964 | August 21, 2009 7:58 AM | Report abuse


Cold front is coming in from the west... Storms will generally move from southwest to northeast...


You are right to complain. The humidity is gross and we need rain. On the plus side, we should get some rain, and drier air is right around the corner.

Posted by: CapitalWeatherGang | August 21, 2009 8:46 AM | Report abuse

Okay, so even before this summer started I disliked summer. But in the last 8 weeks I have been laid off of my job (got a better one), my mother died and I found out I have to go to Tampa for two nights at the end of the month. Come on! Give me a break and some cooler weather. PLEASE!

Posted by: authorofpoetry | August 21, 2009 8:49 AM | Report abuse

ugh - so humid... can't wait for this weather to stop!

Posted by: madisondc | August 21, 2009 9:06 AM | Report abuse

Looks like we will get screwed again in the rainfall department. Nice batch of storms moving southwest to northeast will just miss the metro area but will affect Hagerstown, etc.

Posted by: MKadyman | August 21, 2009 9:38 AM | Report abuse

authorofpoetry: wow I can't imagine going through what you have been going through yet the terrible icing on your cake has been this humidity. I will see what we can do! ;-) because it is too muggy for me as well.
madisondc would likley agree with this too-muggy assessment!
authorofpoetry : give it time till later tonight, I think you'll get wet! :)

Posted by: Camden-CapitalWeatherGang | August 21, 2009 9:45 AM | Report abuse

I knew it was going to be another humid one as soon as I opened the front door and heard the cicadas screeching. Had flashbacks to my childhood in Florida. LOL.

Is there snow in the forecast yet????????

Posted by: ksrgatorfn1 | August 21, 2009 10:35 AM | Report abuse

How many hours can I expect my pool to be open today?

I'm working up there 1-8 and wouldn't mind a little more relaxed of a day.

Posted by: tengoalyrunr30 | August 21, 2009 10:39 AM | Report abuse

Highs have been underestimated in most places throughout the week. Today looks like it may shape up similar.

Posted by: Ian-CapitalWeatherGang | August 21, 2009 12:10 PM | Report abuse

Underestimated looks like an understatement. As of noon, these official reports are 90+:
College Park
Fort Meade
Baltimore Inner Harbor
National and BWI are 89

Posted by: CapitalClimate | August 21, 2009 12:17 PM | Report abuse

Lots of storms on the radar but they seem to be heading NE rather than toward us...not sure what all this "training" talk is about unless Hurricane Bill's Atlantic pass-by stalls everything right over us.

Things were OK last night at the Arlington County Fair, but heavy rain overnight & into the weekend makes things messy both for the outdoor part of the Fair and my dance schedule [tonight, tomorrow night, Monday]. Frankly, this would be a better weekend to have sunny, dry weather. Have to make a rare Friday afternoon trip to Ballston to do banking, my duty at the fair kept me from the usual Thursday afternoon schedule.

Posted by: Bombo47jea | August 21, 2009 12:28 PM | Report abuse

Not sure what's up with the radar, but we've been getting dumped on in Loudoun for over 30 minutes now and nothing's been showing up. Hope it ends soon!
I'll be one of the few who won't complain about the heat and humidity. It beats winter any day of the week. :)

Posted by: rumbly45 | August 21, 2009 12:52 PM | Report abuse

@rumbly: Something is screwy with the hamweather loop. In the meantime, here is the accuweather loop.

That's a nasty line of storms, maybe a thunderstorm warning soon?

Posted by: JJones-CapitalWeatherGang | August 21, 2009 1:04 PM | Report abuse

Radar shows some areas of Northwest Loudon getting over an inch within the last hour. Stay dry out there:

Posted by: JJones-CapitalWeatherGang | August 21, 2009 1:08 PM | Report abuse

...the movement of storms, folks:

Posted by: Josh-CapitalWeatherGang | August 21, 2009 1:11 PM | Report abuse

And joining the 90s nation:
Fort Belvoir

Posted by: CapitalClimate | August 21, 2009 1:11 PM | Report abuse

Doppler-estimated rainfall totals show that well over an inch has already fallen in some locations in and around Leesburg, particularly

Posted by: Josh-CapitalWeatherGang | August 21, 2009 1:15 PM | Report abuse

Also, heat index of 100 at DCA at 1pm (Temp = 91; dew point = 73)

(heat index calculator:

Posted by: Josh-CapitalWeatherGang | August 21, 2009 1:18 PM | Report abuse

Ugh. *sweat*

Posted by: Camden-CapitalWeatherGang | August 21, 2009 1:20 PM | Report abuse

Ok. I really need some good news here. I am having a big party with around 150 people tomorrow. The party is outside and scheduled from 3 p.m. until 8 p.m. I am located in Southeast. I have spent a fortune and have bartenders hired, etc. Is there ANY good news for me?

Posted by: eclectic1978 | August 21, 2009 2:54 PM | Report abuse


Good news? If it storms, should only occur for a small fraction of that 3-8 p.m. window. There's also a 30% chance or so storm activity misses you altogether. Keep your fingers crossed.

Posted by: CapitalWeatherGang | August 21, 2009 3:07 PM | Report abuse

Oh thank god. It is on my rooftop deck so we can go in if its only for a short time...

Posted by: eclectic1978 | August 21, 2009 3:11 PM | Report abuse

Nice wind and lightning at Le'Enfant.

Posted by: Alexandria2009 | August 21, 2009 3:13 PM | Report abuse

@eclectic: Can we come?

Posted by: Brian-CapitalWeatherGang | August 21, 2009 3:57 PM | Report abuse

Will be able to go to the Nats game saturday night and not worry about getting drenched???

Posted by: JamWhitt | August 21, 2009 6:01 PM | Report abuse

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