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Posted at 3:30 PM ET, 07/21/2010

PM Update: After a week of heat, bigger coming

By Ian Livingston

Temps approach triple digits Friday into the weekend

* Heat & humidity double whammy | Heat weaves, then and now *
* Outside now? Radar, lightning, temps & more: Weather Wall *
* Consec days of 90+: 8; Total 90+: 38 (Apr: 2; May: 3; Jun: 18; Jul: 15) *

We saw pesky midday clouds again today for the third time in a row, but as with the last two days, the additional clouds couldn't keep highs from rising to near 90 or into the low 90s. The clouds have become a bit more scattered late in the day and breaks are likely to continue. One or two spots may see a storm still into the evening, though we're at least temporarily moving away from higher rain chances of recent. Attention can now fully turn to rising heat levels that last into and probably through the weekend.

Radar & lightning: Latest regional radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

Through Tonight: We could see an isolated shower or storm into the evening, but there will probably be less activity around than recent days as the most action stays north and south of the area. Nevertheless, anything that pops could potentially be severe with strong winds and heavy rain. Lows reach near 70 in the suburbs to the mid-70s downtown.

Tomorrow (Thursday): We start to feel the influence of building high pressure across the region tomorrow, and rain chances should be close to nothing throughout the day. Skies should be mostly sunny to occasionally partly sunny. If the main local weather story was not already heat, it becomes heat starting tomorrow as highs rise to the mid-90s most spots. Winds from the northwest could blow around 10 mph during the day.

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

Tropics: The tropical wave over the Caribbean, noted here yesterday, is not doing much too interesting, and computer forecasts are not terribly impressive in terms of development. But there is some chance it will impact the Gulf oil containment process in the coming days. The New York Times explores possible issues that could pop up if bad weather hits the area.

By Ian Livingston  | July 21, 2010; 3:30 PM ET
Categories:  Forecasts  
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38 days of 90 degree heat and counting for 2010! What's the record for most 90 degree days in one year for DC? Will we make a run at the record in 2010?

Posted by: kcp1 | July 21, 2010 3:39 PM | Report abuse

The record is 67, but that's 8 above #2 (5 way tie). We're already above avg for an annual number (37) so every day 90+ from here on is "extra".

Posted by: Ian-CapitalWeatherGang | July 21, 2010 3:44 PM | Report abuse

Has the heat gotten to Brian van de Graaff? Or me? Or has he gone Celsius? I swear I heard him say earlier today on Channel 8 that the high today would reach "39," marking "the seventh straight day of highs in the 30's."

Posted by: Groff | July 21, 2010 3:50 PM | Report abuse

I can only hope that the higher heat means slightly less humidity. Dry heat, FTW.

Posted by: LouLewis | July 21, 2010 4:16 PM | Report abuse

LouLewis - I asked about that this morning. Apparently the humidity is supposed to hold, although in my experience temps in the upper 90s and above translate into lower humidity - usually.

Posted by: fleeciewool | July 21, 2010 4:30 PM | Report abuse

There is really now no chance that Summer 2010 won't close out as the hottest summer ever.

Posted by: ennepe68 | July 21, 2010 5:23 PM | Report abuse

ennepe68, we're getting close to needing a below average August for that to happen, so it could be tough!

Posted by: Ian-CapitalWeatherGang | July 21, 2010 5:27 PM | Report abuse

for that *not* to happen that is.

Posted by: Ian-CapitalWeatherGang | July 21, 2010 5:32 PM | Report abuse

Where are the storms?

Posted by: bgaffney491 | July 21, 2010 5:47 PM | Report abuse

Is there any chance that the Summer of 2010 will record 60 days of 90+ temps? It looks like we are headed to 50 days for sure. If it is a hot August we will get it.

Posted by: ajmupitt | July 21, 2010 6:22 PM | Report abuse

Two words... ENOUGH ALREADY!

Posted by: waterfrontproperty | July 21, 2010 6:23 PM | Report abuse

bgaffney491, today is looking pretty quiet, which is noted by "isolated" and "less activity than recent" (considering yesterday didnt have much, you can draw a conclusion we might not see anything).

Posted by: Ian-CapitalWeatherGang | July 21, 2010 6:47 PM | Report abuse

ajmupitt, for "summer" (june-aug) 60 would probably be fairly tough though you never know I guess. We're virtually gauranteed 37 for June-July by Sunday and it looks to me like we'll get a few more before the end of the month. If you're talking the whole warm season, I think 60+ is a decent possibility right now.

Posted by: Ian-CapitalWeatherGang | July 21, 2010 6:51 PM | Report abuse

I hate walking and sweating within a 2 block distance. ugh :-(

Posted by: Camden-CapitalWeatherGang | July 21, 2010 11:13 PM | Report abuse

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