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Posted at 9:40 AM ET, 06/23/2010

Forecast: Heat wave reaches day 5 and counting

By Dan Stillman

Heat index to touch triple-digits. Temperature too?

* Tropical trouble? | Arctic sea ice melting fast | 1930s heat waves *
* Outside now? Radar, temps & more: Weather Wall | NatCast *

Today's Daily Digit
 
A somewhat subjective rating of the day's weather, on a scale of 0 to 10.
 

Another scorcher in the 90s! As temps go up, the digit goes down.
 
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EXPRESS FORECAST

Today: Partly sunny, hot & humid. Mid-90s. | Tonight: Partly cloudy & steamy. 70s. | Tomorrow: Partly sunny, humid & really hot. 30% chance of p.m. storms. Mid-90s to near 100. | A Look Ahead | Get Express Forecast by E-mail

FORECAST IN DETAIL

Welcome to day 5 of this June heat wave. Friday was the last time the high at Reagan National failed to top 90, and highs may very well continue at or above 90 straight through the weekend, with Friday presenting the best hope for breaking the streak. In addition to being slightly cooler, Friday may also give us somewhat of a break in the humidity. But it's short-lived relief as heat and humidity build again this weekend. When's the best chance for a thunderstorm? Let's get to the details...

Temperatures: Latest D.C. area temperature map powered by iMapWeather (base map by Google). Click and hold on map to pan. Double-click to zoom. Refresh page to update. See larger map on our Weather Wall.

Today (Wednesday): The window of semi-tolerable heat this morning closes quickly as temperatures climb to near 90 by late morning. Afternoon highs should make it solidly into the mid-90s with the humidity making it feel like 100 or so. Don't hold your breath for a cooling late-afternoon or evening thunderstorm. Chances are less than 20%. Confidence: Medium-High

The forecast continues after the poll...

Tonight: It's a partly cloudy and steamy evening with humidity locked in place as temperatures fall into and through the 80s, with just a slight chance of an evening storm. Lows should stall in the 70s most spots with partly cloudy skies. Confidence: Medium-High

Headed to see Strasburg pitch today? Check in with NatCast. And keep reading for the forecast through the weekend...


Storm clouds as seen yesterday evening from Cleveland Park. By CWG photographer Ian Livingston.

Tomorrow (Thursday): If anything, tomorrow might be hotter than today. Highs in the mid-to-upper 90s are likely with 100 within reach as we continue partly sunny and humid. The afternoon heat index will probably reach the 100-105 range in some locations. Chances for afternoon or evening storms are better than today -- around 30% -- as a cold front approaches. Confidence: Medium

Tomorrow Night: Evening thunderstorm chances continue around 30% under partly cloudy skies. A bit less humid air begins to move in during the evening and overnight after the cold front passes through. Lows are still very mild, in the 70s. Confidence: Medium

A LOOK AHEAD

How much cooler and less humid are we talking for Friday? The strength of summer cold fronts can be difficult to gauge. But at the very least it should be several degrees cooler -- highs probably near 90 under partly to mostly sunny skies -- with humidity down to the moderate range. Confidence: Medium

We head right back into heat wave territory this weekend. Humidity edges upward Saturday with highs likely in the low 90s. The heat and humidity really come roaring back Sunday when highs could return to the mid-to-upper 90s. (Is this fun or what?... um, yeah, or what.) Both days should be partly sunny with morning lows in the upper 60s to mid-70s, and what looks to be a 20-30% chance of afternoon/evening storms. Confidence: Medium

By Dan Stillman  | June 23, 2010; 9:40 AM ET
Categories:  Forecasts  
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Next: Relentless heat threatens D.C.'s June record

Comments

Got to my dance okay...the rain was over by 8:10 PM...but I still don't like these evening downpour threats on dance night...which is when they always seem to occur [courtesy of your friendly "much-needed-rain" crowd]!!!

And there are still rain threats on 3 to 5 of the next seven days...still waiting for the "dry summer" we were "promised".

As for the contention that the June heat wave is in some way "abnormal"--I'd regard any period free of heat waves between Memorial Day and Labor Day around here as abnormal weather.

Already mostly sunny and 80 degrees here.

Posted by: Bombo47jea | June 23, 2010 8:03 AM | Report abuse

so hot already... it's going to be a long summer!

Posted by: madisondc | June 23, 2010 8:10 AM | Report abuse

It has been a very dry and hot spring and most of us west of Arlington got NOTHING yesterday to feed our parched lawns and plants. We have rain threats many days most years around May-July and they are spotty. This year especially so.

I am hoping for lots of rain before we really hit the summer heat. Rain is good! It cleans the air and makes everything green.

Posted by: rocotten | June 23, 2010 8:46 AM | Report abuse

Another summer where the thunderstorms seem to develop EAST of NW Montgomery County. Last night was a classic example. The storm seemed to develop over Boyds and then moved through Gaithersburg and on east. We haven't had a drop of rain in over two weeks.

Already 85.8 at 9:00 am.

Posted by: MKadyman | June 23, 2010 8:59 AM | Report abuse

84 degrees at 8:55am. It's gonna be a long hot day.

Snowiest Winter ever followed by the warmest Spring ever and now we are headed for the hottest Summer ever.

Can we have a normal season?

Posted by: rwalker66 | June 23, 2010 8:59 AM | Report abuse

CWG - when was the last time all three airports hit 100 degrees or higher?

I seem to recall, too, somewhere in the late 80's to early 90's, where we had a streak of 100 degree days in June - and those were the hottest days of that summer.

Posted by: MKoehl | June 23, 2010 9:13 AM | Report abuse

Had a fantastic view of the T-storm cells while they were over Anne Arundel County last night from a friends Deck in Laurel. I wish I had Kevin or Ian's photography skills.

Posted by: Brian-CapitalWeatherGang | June 23, 2010 9:22 AM | Report abuse

The storm last night, which looked like it was headed straight for us at the Potomac River Bridge, veered a little to the northeast and just winged us - had some wind, a little lightning, a little thunder and even less rain - again.

Posted by: waterfrontproperty | June 23, 2010 10:07 AM | Report abuse

Hey waterfrontproperty, yeah my property in center city (Shaw) is craving water too. Ugh. Trees are hurting too, in the direct sunlight, on NY ave NW!

Posted by: Camden-CapitalWeatherGang | June 23, 2010 10:29 AM | Report abuse

@rocotten - Of course rain is good for those of us who care about vegetation, green planet, and those kinds of things. :-)

Posted by: LoudounGeek | June 23, 2010 10:32 AM | Report abuse

@Rwalker, where's the fun in that?!

Posted by: Brian-CapitalWeatherGang | June 23, 2010 10:48 AM | Report abuse

@Bombo47jea -- as a member of your friendly "much needed rain" crowd, I assure you we have no power over the weather or its forecasting.

(BTW, some booms and a dusting of rain in Michigan Park last night).

Posted by: kperl | June 23, 2010 11:02 AM | Report abuse

@ rocotton--Quit whining about it--I got plenty of rain yesterday evening, and we have the threat of rain ongoing at least part of this week and over the weekend. Hardly a dry summer by my standards--"much needed rain" keeps trying to drench me whenever I have a dance to go to.

Still waiting for that "dry" summer...BTW parts of South Arlington DID have a power outage last night, though the Clarendon Ballroom didn't [!]. Is this what we want to put up with all summer?

Posted by: Bombo47jea | June 23, 2010 2:01 PM | Report abuse

@kperl...50% rain threats, including part of the weekend! Probably will keep me home at hike time Sunday afternoon.

Posted by: Bombo47jea | June 23, 2010 2:09 PM | Report abuse

Greetings from San Francisco.

Beyond grateful to be here and not in DC's beastly weather. SFO: daytime temps in the low 60s, with warm sun and azure blue skies. It's been quite cool at night, dropping to the 50s.

I was glued to DC area radar last night, hoping beyond hope for rain (most unfortunately, only a "dusting" in Michigan Park). Since any rain whatsoever always ruins your dance card, Bombo, please let the 'MNR' crowd know when you can be available to water our lawns, gardens, and (my beloved) trees!

Posted by: TominMichiganParkDC | June 23, 2010 2:10 PM | Report abuse

Interesting... The temperature and Strasburg's first pitch were neck and neck in the poll, until the poll was cross-posted on Nationals Journal. Now it's a landslide for Strasburg's first pitch. Can Mother Nature pull out the upset?

Posted by: Dan-CapitalWeatherGang | June 23, 2010 2:29 PM | Report abuse

So what's the verdit on the Strasburg v. weather situation?

Posted by: megamuphen | June 23, 2010 8:36 PM | Report abuse

Via our Twitter feed - @capitalweather: For the record, Temp at first pitch: 95, First pitch speed: 96.

Posted by: Jason-CapitalWeatherGang | June 23, 2010 9:38 PM | Report abuse

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