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Posted at 3:15 PM ET, 07/22/2010

PM Update: Season's longest heat wave grows

By Ian Livingston

Heat Advisory Friday; Excessive Heat Watch Saturday

* Did melting ice cause the earthquake? | Tropical depression #3 forms *
* Outside now? Radar, lightning, temps & more: Weather Wall *
* Consec days of 90+: 9; Total 90+: 39 (Apr: 2; May: 3; Jun: 18; Jul: 16) *

Had enough heat? If so, sorry. This heat wave will become our longest of the year -- passing the 11-day stretch of 90+ that occurred June 19-29. Mostly sunny skies and a downsloping wind off the mountains have combined to create a hotter day than recent as highs reach the mid-90s most spots. It is a little less humid than it's been, but our "break" is only a day long. With higher humidity, we head closer to 100 tomorrow and quite possibly past that mark Saturday. Such heat will be dangerous for some, so the NWS has hoisted heat advisories for tomorrow and an Excessive Heat Watch for Saturday.

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.

Through Tonight: It's going to be a warm evening but probably the best of the next few as temperatures settle into the upper 80s around sunset. Savor the lower humidity levels, as they'll be on their way back up overnight into tomorrow. Under mostly clear skies, lows fall to around 70 in the suburbs to the mid-or-upper 70s downtown.

Tomorrow (Friday): Hot and humid sums it up. An upper-level area of high pressure over the southern U.S. builds north and helps raise temperatures another notch tomorrow. Mostly sunny skies should yield 90+ before lunchtime in many spots, and highs likely range from the mid-90s in a few cooler spots to mostly upper 90s and near 100. Whenever it gets this hot there can be an isolated storm, but given the strength of the high pressure overhead I think we'll stay storm free.

See David Streit's forecast through early next week. And if you haven't already, join us on Facebook and follow us on Twitter.

By Ian Livingston  | July 22, 2010; 3:15 PM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: Did melting ice cause D.C. earthquake?
Next: Just how hot tomorrow?


Any idea how the Excessive Heat Watch issued for Saturday will affect the Crystal City Twilighter 5K at 8 p.m.? Will the organizers still hold the race?

Posted by: Steelers36 | July 22, 2010 3:33 PM | Report abuse

Nothing on the websites of the sponsors indicating it won't be run. I've been racing for 35 years and have not heard of a race cancelled for heat, or for cold when I lived in Alaska. Just need to slow down and run smart within yourself.

Posted by: marathoner | July 22, 2010 5:05 PM | Report abuse

One word for this summer's heat: RAW!!! Hey GWG, can you guys explain the climatology behind this summer's excessive heat? What's going on the these hot air masses that plant themselves over DC? Forgive me if you've addressed this topic already. I've been out of the loop for a while.

Posted by: GD1975 | July 22, 2010 5:12 PM | Report abuse

I guess I was wondering - if it hits close to 100 during the day - what the temperature might be around 8 p.m. on Saturday.

Posted by: Steelers36 | July 22, 2010 5:17 PM | Report abuse

Not to be indelicate, but good lord I'm tired of sweating as I go about my daily business!

Posted by: natsncats | July 22, 2010 5:18 PM | Report abuse

Steelers36, Jason wrote this yesterday which covers much of it. Though I'd also argue a big driver overall is a very strong upper-level subtropical ridge of high pressure. In the earlier heat waves it mostly nudged over us from the west while this time it has built in from the south and southeast.

Posted by: Ian-CapitalWeatherGang | July 22, 2010 6:39 PM | Report abuse

The high heat will make Saturday night's dance @ Glen Echo rather uncomfortable...there's no A/C or winter heating at the Spanish Ballroom.

Tomorrow night@ Dulles Hilton looks fine with A/C...a thunderstorm might pop up like last Friday night.

Posted by: Bombo47jea | July 23, 2010 12:45 AM | Report abuse


The temperature around 8 p.m. Saturday may still be in the low-to-mid 90s with a heat index around 100. Pretty rough, I know - and potentially hazardous for significant exertion.

Posted by: Jason-CapitalWeatherGang | July 23, 2010 8:27 AM | Report abuse

The Gulf oil spill, hurricanes, and the recent heat wave have many searching for answers. The internet is buzzing with articles and excellent blogs. But could it be simply the biblical sequence of God's wrath being poured out upon the earth which is relevant to current events in today's world. What if we are dealing with the wrath of God? Please understand the wrath of God is letting man slip deeper and deeper into the consequences of his own sin. Please visit my website at . Author of the book Final Warning

Posted by: daniel24 | July 24, 2010 3:04 PM | Report abuse

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