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Posted at 3:15 PM ET, 09/18/2008

PM Update: Cool Air Reinforcements Arrive

By Ian Livingston

Mostly sunny, below-average temperatures on Friday

Webcam: Latest view of D.C. from the Netherlands Carillon at Arlington National Cemetery. Courtesy National Park Service. Refresh page to update. See our Weather Wall for a larger version of this image.

Plenty of late-summer sunshine has led to fairly warm temperatures running a few degrees above average in many locations today, though highs in the upper 70s and low 80s are still about as good as it gets. A reinforcing shot of cool air is moving into the area as a cold front passes by this afternoon. Tonight should be quite cool again, and tomorrow's temperatures will be lower than recent days.

Tonight: Some clouds may move in off the ocean overnight, especially south of D.C., so expect variably cloudy conditions depending on location. Readings should bottom out right around 50 in the coolest suburbs while remaining closer to 60 in the city and where clouds are more numerous. Winds will be light from the north and northeast.

Tomorrow: After some morning cloudiness, the end of the work week will be cool and mostly sunny. High temperatures should top out around 70 in the north and west while hitting the low 70s in D.C. and to the south or east.

See Josh's full forecast through the beginning of next week, NatCast for tonight's game, and SkinsCast for Sunday's game.

By Ian Livingston  | September 18, 2008; 3:15 PM ET
Categories:  Forecasts  
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Meeting Announcement:

"Blogging the Weather"

Featuring: Bob Swanson and Doyle Rice, USA Today’s “The Weather Guys”
Jason Samenow and Dan Stillman, Washington Post’s, Capital Weather Gang
Joe Bartosik, WeatherBug

When: Tuesday, September 23, 2008

Where: American Institute of Architects (AIA)
Board Room, 2nd floor
1735 New York Avenue NW
(at corner of 18th St. and E St. NW), one block west of the Old Executive Office building near the White House.

RSVP: By Friday, September 19, 2008, to the DC-AMS e-mail box, (preferred), or (for questions or if no email access) by calling Steve Tracton at (202) 330-1090 or Andrea Bleistein at (631) 838- 4394

Agenda: 7:00 PM Snacks/drinks and socialize

7:30 PM Open Business Meeting

7:45 PM Blogging the Weather Panel, Q & A

8:30 PM Discussion

9:00 PM Meeting Closes

Cost: No Charge
For more information about chapter activities, see the DC-AMS web site at:

Posted by: Steve Tracton | September 18, 2008 4:58 PM | Report abuse

Its 29 degrees on Mt. Washington right now.

Posted by: Period | September 18, 2008 5:49 PM | Report abuse

While the relatively high (for overnight period) winds of 10-15mph will make it quite difficult, I wouldn't be entirely shocked if a few of the outer NW suburbs drop to 49 or 48. However, conditions tonight are far from ideal -- you'd want clear skies and light winds to really bottom out temperatures -- so I'd say there's a less than 25% of this happening; but it's still possible!

Posted by: Josh, Capital Weather Gang | September 18, 2008 5:52 PM | Report abuse

Fall issue of the Sterling Reporter has a good quick read on the June 4th severe weather outbreak on page 3:

Posted by: weatherdudeVA | September 18, 2008 6:10 PM | Report abuse

D.C. below 60 tonight? Could it be?

Posted by: Sterling | September 18, 2008 11:00 PM | Report abuse

Sterling--I think it's a given. After all, the suburbs are looking to drop past 50.

1025 hPA right now in McLean. That's the highest pressure reading I've seen in quite some time, and we may very well get higher before it recedes.

Posted by: mcleaNed | September 18, 2008 11:27 PM | Report abuse

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