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Posted at 3:25 PM ET, 09/ 8/2010

PM Update: More 90s, but cool on the doorstep

By Ian Livingston

Pleasant weather for most of near future

* Baltimore sets new 90+ record | Six early American climate myths *
* Outside now? Radar, temperatures & more: Weather Wall *
* Number of 90+ days: 62 (Record: 67, 1980) *

What a difference a few hours makes when it comes to a cold front passage around here. Add in downsloping winds right behind the front and you've got a pretty hot one (despite rapidly falling humidity levels). Temperatures managed to reach the low-to-mid 90s this afternoon including at least 95 at National Airport. But, as noted, dew points have plummeted into the 40s and 30s behind the front, and that helps set up the cool nights and days ahead.

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: Unlike many hot days this summer, today's heat will quickly vanish as we head through evening and into the night thanks to low humidity and cool air moving in. Temperatures near 80 around sunset fall to lows in the upper 50s for the suburbs to lower 60s downtown. Winds continue to blow, around 10 mph from the northwest.

Tomorrow (Thursday): This is a winner of a day. Too bad it's a work day, right? We'll see mostly sunny skies and a nice breeze from the northwest as highs reach the rather glorious upper 70s to near 80.

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

By Ian Livingston  | September 8, 2010; 3:25 PM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: Baltimore breaks 90+ degree day record
Next: Forecast: Much cooler and quite dry next 3 days


Is the heating caused by downsloping air simply a reaction to the compression of the air?

Posted by: pjdunn1 | September 8, 2010 3:51 PM | Report abuse

Setting us up for hot weather next week. Cooldown from now to the weekend then hot weather when Monday rolls around. I don't believe that 84 will be the high next monday. It'll be more like low 90s.

Posted by: jojo2008 | September 8, 2010 3:54 PM | Report abuse

pjdunn, I believe compression is the main driver for the warming of air coming off the mountains. In this case we probably got some extra warming with a little later frontal passage than expected (at least on my end -- see yesterday's blown numbers in PM Update). The air was exceptionally dry this afternoon as well. Not often you see mid 90s with des points in the 30s around here. It was hot but I was surprised when I first saw the temperature at National.

Posted by: Ian-CapitalWeatherGang | September 8, 2010 7:26 PM | Report abuse

Acuweather is predicting 82 and 85 for Monday and Tuesday. Don't see anything close to 90.
A little nostalgia?

Posted by: LoudounGeek | September 8, 2010 7:41 PM | Report abuse

They're setting us up again, LoudonGeek. It's been the same thing for the past 3 weeks. Going into the weekend, these forecasters have told us, "that's it!" no more 90s this year. then here the 90s come again. Just you watch...

Posted by: jojo2008 | September 8, 2010 9:47 PM | Report abuse

I will write-off 90 degree days once our record highs cease being in the 90s -- in October :)

Posted by: Camden-CapitalWeatherGang | September 8, 2010 11:07 PM | Report abuse

There's always the possibility of a record breaking heat wave in mid-to late October, too.

Posted by: Bombo47jea | September 9, 2010 12:14 PM | Report abuse

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