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Posted at 6:20 PM ET, 06/28/2010

PM Update: Severe departs, shower/storm possible

By Ian Livingston

Cool down starts slowly tomorrow... but it will be sweet

* Severe Thunderstorm Watch canceled | NWS Storm Reports *
* Alex in the Gulf - oil interactions uncertain *
* Outside now? Radar, lightning, temps & more: Weather Wall *

Strong to severe thunderstorms that moved through a good portion of the area signal the start of a several day change to kinder summer conditions. Damage reports are not widespread, but the most intense activity targeted the immediate metro area and caused at least several trees to fall in Fairfax County in addition to reports we've received from Twitter. Twitter user @markbober captured a cool image of the clouds as they were moving in. There are also reports of power outages, including around 20k impacted in Montgomery County. Before the rain, D.C. reached 95 or higher (97 officially) for the seventh time in the last 10 days of this heat wave.

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: The severe threat is likely over as storms head off to the east, but isolated showers or thundershowers are possible through around midnight. The cold front is still hanging back a to our west, so tonight continues rather muggy and warm. Lows fall to the low-and-mid 70s across the area.

Tomorrow (Tuesday): We start to transition from this hot and disgusting air mass to a much more pleasant one tomorrow, though probably not quick enough to keep mostly sunny skies from helping temperatures rise near and past 90 again. One thing you'll notice is much lower humidity filtering in on fresh northwest winds. Heading into the night, the cooler-than-normal air mass will get better established, and it should be downright spectacular for a while!

See Jason Samenow's full forecast through the Fourth of July weekend. And if you haven't already, join us on Facebook and follow us on Twitter.

By Ian Livingston  | June 28, 2010; 6:20 PM ET
Categories:  Forecasts  
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Next: Forecast: Gradual improvement - less hot & humid


So after sweating through three and a half hours with no power, I've got a question for the CWG. I understand that, the summer atmospher usually takes all day to destablize and produce air mass tstorms, however, why is it that cold fronts seem to blast through here only at dinner time? What 's wrong with these things, don't they likce lunch or breakfast? Inquiring minds want to know.

Posted by: VikingRider | June 28, 2010 6:41 PM | Report abuse

VikingRider, more often than not our thunderstorms are triggered at the surface by a leeside trough coming off the Appalachians. It usually develops as the day wears on and then drifts east. The cold front well west does aid a bit (or the features associated with it do) as you might not get the storms without a cold front pushing east but it's passage is not necessarily the primary driver.

Posted by: Ian-CapitalWeatherGang | June 28, 2010 7:03 PM | Report abuse

Here in Seven Corners / Lake Barcroft, we got 1.9", big oak downed lines, power still out

Posted by: KPosty | June 28, 2010 7:09 PM | Report abuse

0.8" in North Arlington near Marymount (maybe 3 miles as the crow flies from 7 Corners, 4 miles as the Tercel flies).

No power outages to interrupt my afternoon World Cup recording of the Brazil game.

Posted by: Joel_M_Lane | June 28, 2010 8:01 PM | Report abuse

Moisture actually feel from the sky in Glover Park today, maybe the first since last February's snows?

Re: the World Cup, I don't have cable so Univision flickered a bit during the Chile-Brazil match. Long as I get a good signal for Spain-Portugal tomorrow, I'll take whatever comes from the sky since our trees still need some moisture. But, oy vey, this June has been interminable. And we still have July and August ahead and only Walter's pics (and a couple from CWG last February) to sustain.

Posted by: JerryFloyd1 | June 28, 2010 9:23 PM | Report abuse

Nice 84 temp to 74 dew for a 11p heat index of 91 at DC.

Posted by: Ian-CapitalWeatherGang | June 28, 2010 11:20 PM | Report abuse

Not one stinking drop of rain AGAIN at the 301 Bridge!

Posted by: waterfrontproperty | June 28, 2010 11:31 PM | Report abuse

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