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Posted at 5:00 AM ET, 06/30/2008

Forecast: Humidity and Storminess Exit Stage Right

By Jason Samenow

The daily showing of heat, humidity and strong afternoon storms has come to a close. There are rumors a thunderstorm may try to make an encore performance today, but at least the heat and humidity have hit the road. And starting tomorrow, a new show featuring comfortable temperatures and dry weather arrives in town. Will it last through Independence Day?


Radar: Latest D.C. area radar loop, courtesy National Weather Service. Colored boxes represent severe warnings (key). Refresh page to update, or click on image to expand.

Partly sunny. 30% chance of p.m. t'storms. 83-87. It will definitely be less humid than the weekend and temperatures will be about five degrees cooler. Nonetheless, the really dry air won't filter in until overnight and with somewhat unstable air overhead (due to cool air moving in at cloud level while the sun heats up the surface), a few storms could develop late in the afternoon into the early evening.

Overnight, any isolated t'storm activity will dissipate and it will become rather pleasant. Lows will drop to near 60 in the suburbs and mid 60s downtown.

Confidence: Medium-High

Keep reading for the forecast through the week.

A towering cumulonimbus cloud with a pileus cap yesterday afternoon. By Capital Weather Gang photographer Ian Livingston.


Mostly sunny. Beautiful. 82-86. Savor the low humidity and comfortably warm temperatures. And a light breeze from the west will make it that much more pleasant.

Overnight, it will be clear and refreshing. Lows drop into the upper 50s in the suburbs to the mid 60s downtown.

Confidence: High


Wednesday's weather will be similar to Tuesday and just about as nice. Highs should reach the mid 80s with comfortable humidity. Confidence: Medium-High

Humidity increases a little Thursday with a wind from the south ahead of an approaching cold front. High temperatures should reach the upper 80s -- and an isolated afternoon evening/thunderstorm is possible. Confidence: Medium

The weather for Independence Day depends on whether Thursday night's cold front is able to cleanly clear the area or gets hung up. For more information, see our special, detailed Fourth of July forecast.

Next weekend should be pretty nice with high pressure giving us dry conditions, reasonable humidity levels and highs in the 80s. However, we'll need to watch a stationary front to our south which may have some storminess along it. If it drifts a little further north than currently forecast, it may not be as nice as currently anticipated. Confidence: Low-Medium

By Jason Samenow  | June 30, 2008; 5:00 AM ET
Categories:  Forecasts  
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Next: Freedman: Why Is James Hansen So Worried?


that is a neat photo of the clouds!

Posted by: madison | June 30, 2008 8:47 AM | Report abuse

Agreed! Awesome shot Ian!

Posted by: Mike from the Blue Ridge | June 30, 2008 9:45 AM | Report abuse

Thanks. Picture was during the early-afternoon flare up of storms. This one was forming in eastern sections of D.C. and eventually got it's act together a bit once out of the city. For a while between 2 and 3 there were several towering cumulus and cumulonimbus racing up really fast.. got one skinny tower that produced a mini anvil, but it was vertical and doesn't look like much sized way down. At first I didn't like the smokestack in the frame above, but it almost looks like the cloud is coming from it so I guess it works. ;)

Posted by: Ian, Capital Weather Gang | June 30, 2008 10:10 AM | Report abuse

Great shot, Ian. It really does look like the smokestack is producing the cloud.

Posted by: Murre | June 30, 2008 10:53 AM | Report abuse

This morning: Chiefly patchy altocumulus; some castellanus. Agrees quite well with 30% risk of thunderstorms predicted.

Posted by: El Bombo | June 30, 2008 11:13 AM | Report abuse

Line of storms from Martinsburg WV to where I-81/I-66 meet up, moving east. If it holds together it'll affect Loudoun, Frederick (MD), and Montgomery counties in a little while.

And that is a really cool picture Ian!

Posted by: weatherdudeVA (Lake Ridge) | June 30, 2008 11:22 AM | Report abuse

So far, no lightning with the approaching showers.

Posted by: Dan, Capital Weather Gang | June 30, 2008 11:47 AM | Report abuse

Any word on how the weather is shaping up for the AT&T National starting Thursday and going through the weekend?

Posted by: manassasgolf | June 30, 2008 11:53 AM | Report abuse

manassasgolf -- We haven't decided yet if we'll do a separate special forecast for the AT&T National ... since it's a daylong event the forecast probably wouldn't differ much from our usual full forecast. So for the moment, refer to our full forecast for the latest on the Thursday through Sunday period.

Posted by: Capital Weather Gang | June 30, 2008 12:15 PM | Report abuse

Really cool picture.

I could tell the humidity broke when my sinus headache that I have had for a week went away.

Posted by: ep | June 30, 2008 2:59 PM | Report abuse

One loud clap of thunder near 8th Road South and Florida Streets, Arlington around 5:20 PM.

Posted by: El Bombo | June 30, 2008 6:35 PM | Report abuse

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