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Posted at 3:15 PM ET, 08/11/2009

PM Update: Heat Wave Official, and Likely Over

By Ian Livingston

A few evening storms? Near-average temps tomorrow

* Outside Now? Radar & More: Weather Wall | Lightning Map *
* Climate Change & National Security: A Tough Sell *
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Our heat wave is officially in the books as National tops 90 degrees again this afternoon -- the first such three-day stretch of 90+ this year. As the high pressure in control the last few days moves away, temperatures were held in check, but most places have risen near 90 and into the low 90s. Heading toward evening, variably cloudy skies continue with just a small chance of a shower or storm and many spots probably staying dry.

Radar: Latest regional radar loop shows movement of precipitation over past two hours. Powered by HAMweather. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

Through Tonight: There's a chance of a few passing showers or storms through evening and into the overnight as a front passes by. Unfortunately for those hoping to catch the Perseid Meteor Shower at its peak, clouds look to be an issue, but there may be enough breaks to catch some glimpses. Sunset temperatures in the mid-80s fall to lows ranging from around 70 to the mid-70s, with some suburbs possibly touching the upper 60s.

Tomorrow (Wednesday): We cool things down just a bit more Wednesday behind the cold front. Highs should rise to near-average levels in the mid-and-upper 80s with humidity coming down a little. Clouds should increase during the daylight hours to partly or mostly cloudy by afternoon and we could see a threat of isolated showers or storms into evening.

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

Tropics: Yesterday I noted that the Atlantic is showing some signs of life. Today Tropical Depression #2 (TD2) was declared to the west of the African coast. TD2 is expected to become Tropical Storm Ana in the next day or so as it treks westward. The current 5-day forecast brings it to a position well northeast of the Leeward/Windward Islands and it is much too early to know if there is any threat to land from this system.

By Ian Livingston  | August 11, 2009; 3:15 PM ET
Categories:  Forecasts  
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Next: Forecast: Heat Wave Dissolves, Humidity Sticks


Why are we sunny and hitting 90 again today? That wasn't supposed to happen. Yesterday, the forecast yesterday clearly called for an approaching cold front to keep cloudiness up and temperatures down today. Looking at the satellite and surface map, it looks like the front slowed down or stalled to our northwest (it was supposed to stall out a little to our south, in southern VA). Is this big tropical high stronger than forecast (its strength is obviously a factor in the front's sluggishness), or can we still expect the frontal passage maybe tonight or tomorrow morning? If not, we'll be in for a fourth day of 90 or 90-plus tomorrow.

Posted by: MMCarhelp | August 11, 2009 4:35 PM | Report abuse

MMCarhelp, the forecast here has been calling for 90s today since it has been in the forecast period. I'm not sure about elsewhere but I believe many were going for 90s today. The second front should pass through tonight though it wont get too far south so we'll stay with fairly normal summer heat -- though more likely below 90 tomorrow.

Posted by: Ian-CapitalWeatherGang | August 11, 2009 4:43 PM | Report abuse

OK, thanks, Ian. Perhaps CWG did not mention cloudiness and a front today, but several of the local forecasts did. They also did not mention two fronts. The first one (if it could be called a front at all) was very weak...its remnants appear to be off to our south. The second one, as you note, is still clearly off to the northwest. NWS progs it coming through and, again, stalling just off to our south.

Bermuda Highs (and their westward displacements), once they get set up, are notoriously tough to crack. They are very strong, and their basic circulation reaches such high levels (often above the 250 mb layer) that they are an effective barrier to cold fronts. In general (I don't know how you feel) I dislike summertime Bermuda Highs more than any other large-scale feature of the D.C. area climate.

Posted by: MMCarhelp | August 11, 2009 5:43 PM | Report abuse

Still Hot??
Think Snow!!

Posted by: SteveT-CapitalWeatherGang | August 11, 2009 6:12 PM | Report abuse

Looks as though we have some risk of rain through the weekend, then high pressure builds in around Monday...

Tropics...rather quiet but some action builds. Depression [TD#2] moving west of Cape Verde could build to Tropical Storm Ana within a day or so. Felicia, downgraded to tropical depression passes by Maui. Rest is mainly waves along ITCZ.

Posted by: Bombo47jea | August 12, 2009 12:02 AM | Report abuse

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