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Posted at 8:20 AM ET, 06/24/2009

Forecast: Warm Wednesday, Then Some Heat

By Dan Stillman

Highs near and above 90 tomorrow through Sunday

* NatCast | How Many 90-Degree Days? | Later: Lightning Safety *


Today: Mostly sunny. Mid-to-upper 80s. | Tonight: Mostly clear. Mid-60s to near 70. | Tomorrow: Mostly sunny. Isolated p.m. shower/storm? Low 90s. | A Look Ahead


I know meteorologists have a reputation for reveling in active or extreme weather. But after dealing with the almost daily threat of rain and storms earlier this month, I have to say a second straight day of sunshine, highs in the 80s and no rain is a nice change of pace. Of course, we wouldn't want such boring weather to stay for too long, now would we? Never fear, some summer heat and isolated storm chances are on the way.

An interesting sky over D.C. yesterday evening. By CWG photographer Ian Livingston. Click here for larger image.

Today (Wednesday): A light breeze from the north keeps the humidity in check and mostly sunny skies prop high temperatures to the mid-to-upper 80s. Warm? Yeah. But I wouldn't call it "hot" ... yet. Confidence: High

Tonight: A mild evening with temperatures dropping through the 80s and into the 70s. Overnight, skies stay mostly clear as lows dip to the mid-60s (suburbs) to near 70 (downtown). Confidence: High

Keep reading for the forecast through the weekend....

Tomorrow (Thursday): Light but warm breezes from the west and southwest bring in the heat with mostly sunny skies and highs hitting the low 90s. Humidity still shouldn't be too bad, but an isolated shower or thunderstorm could pop up in the late afternoon. Confidence: Medium-High

Tomorrow Night: An approaching front will likely turn our winds to come out of the south, which means an increasingly muggy evening and overnight lows around 70-75. There's a 30% chance or so that the front sparks a shower or storm during the evening or overnight. Confidence: Medium


That front that I just mentioned above is technically a cold front, but it doesn't look like it will push through strong enough to cool us down any. So Friday figures to be a partly sunny and sticky day with highs near 90 and the chance of a passing shower or thunderstorm. Lows Friday night near 70. Confidence: Medium

The humidity might not be as bad on Saturday, though it'll still be hot with a good amount of sun and highs near 90. Only a slight chance that you'll see a pop-up shower or thunderstorm in the late afternoon or early evening, followed by Saturday night lows near 70-75. Confidence: Medium-High

It's still early to nail down Sunday temperatures with high confidence, but the day may very well be a scorcher with high humidity, highs in the low-to-mid 90s and heat indices in the mid-to-upper 90s. The next cold front could bring a chance of showers and thunderstorms late in the day. Confidence: Medium

By Dan Stillman  | June 24, 2009; 8:20 AM ET
Categories:  Forecasts  
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Next: Lightning Safety: When Thunder Roars, Go Indoors


Spectacular summer morning!

Posted by: weathergrrl | June 24, 2009 10:06 AM | Report abuse

I believe the technical term for the sky in that photo is: "confused."

Posted by: Andrew-CapitalWeatherGang | June 24, 2009 10:17 AM | Report abuse

Hope everyone's had a chance to step outside and enjoy the toasty but not overly humid warmth

Posted by: Dan-CapitalWeatherGang | June 24, 2009 1:37 PM | Report abuse

The cirrus clouds moving from the north were probably leftovers from the rain that has been plaguing New York and New England lately. The sky was particularly interesting when I left for my dance yesterday evening.

Phenology briefs: Crape myrtle is beginning to bloom in Arlington. Fireflies are out in large numbers...the first fireflies this year came out on May 31. One effect of the rain is that we have the greenest late spring and early summer in years. Many herbaceous plants are very lush and taller than I've seen in years.

Tom Skilling is on WGN now. He reminds us that the "heat advisory" criterion is a heat index of 105F. That is likely in Chicago today and we could see our first heat advisory in a couple days or so.

Posted by: Bombo47jea | June 24, 2009 1:38 PM | Report abuse

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