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Posted at 3:15 PM ET, 08/26/2009

PM Update: Quite Warm and Still Quiet

By Ian Livingston

A little cooler Thursday, some showers or storms late?

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Lots of sun today was joined with moderate levels of humidity to create a rather hot one for late August. Temperatures have risen to near and above 90 in many spots, and this is possibly our final 90+ day of meteorological summer for National Airport, the 20th such occurrence there since June 1, and significantly below the June-through-August average of 31. Partly cloudy skies and warm conditions last into evening.

Temperatures: Current area temperatures. Powered by Weather Bonk. Map by Google. Hover over and click icons for more info. Click and hold on map to pan. Refresh page to update. See map bigger on our Weather Wall.

Through Tonight: Skies stay partly to mostly clear this evening with temperatures falling through the low-or-mid 80s around sunset. Overnight lows settle around the mid-60s in the suburbs to near 70 downtown.

Tomorrow (Thursday): Most of the day should be partly cloudy and warm as a cold front drifts toward us. Highs should rise to the mid-and-upper 80s. Though much of the day will be dry, isolated storms are possible starting late afternoon and rain chances may increase overnight.

See Dan Stillman's full forecast through the weekend. And if you haven't already, join us on Facebook and follow us on Twitter.

Venezuelan Thunderstorm: A video has been making the rounds this week of a thunderstorm complex that forms very regularly over the Catatumbo River in Venezuela. Termed by some as a "continuous" lightning storm, the area sees storms set up during 140-160 nights a year, and they last for about 10 hours each night. See the video, and check out the Wikipedia page.

By Ian Livingston  | August 26, 2009; 3:15 PM ET
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Last 90 degree day ?!? Wow. . . .

BTW, I assume you're leaving open the possibility of some 90 degree days in September, which is still "summer" by the calendar that everyone other than meteorologists use (at least in the northern hemisphere).

Posted by: ah___ | August 26, 2009 4:02 PM | Report abuse

Definitely still warm out there, but at least dewpoints are down in the 60s--preventing the INSTANT sweat we were all experiencing.. ugh!

Posted by: Camden-CapitalWeatherGang | August 26, 2009 4:42 PM | Report abuse

ah___, I did say in meteorological summer -- someone kindly added a link -- which ends in a few days. Tomorrow may have a chance (NWS is calling for low 90s), after that we're done for August it appears. I would not personally be surprised to see one or more in Sept, perhaps even Oct.

Posted by: Ian-CapitalWeatherGang | August 26, 2009 4:48 PM | Report abuse

The wikipedia article on Catatumbo lightning says it comes without thunder. Is that because it is so far up in the atmosphere, or some other reason?

Posted by: mmurphy70 | August 26, 2009 10:14 PM | Report abuse

That lightning display on the video, in Venezuela, was not that impressive. I've seen more frequent bolts right here in the D.C. area, and perhaps no other storms on earth can compare with what happens in the American South and Midwest during the severe storm season, though some parts of Northern Argentina, Northern India, and Australia get some impressively severe storms.

If you want to see some REAL lightning, check out a Southern storm in AL or MS along an April cold front. Or a big High Plains supercell just east of the Rockies, not only with lightning but with baseball-to-softball-sized hail as well.

Posted by: MMCarhelp | August 26, 2009 11:10 PM | Report abuse

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