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Posted at 3:15 PM ET, 09/24/2009

PM Update: Cold Front to Help Fall Get Going

By Ian Livingston

Cooler on Friday, some showers possible?

* NatCast | UnitedCast | D.C. Rain Linked to Hurricane Season? *
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Our final day of this stretch of well-above average warmth has come and is about to be gone. Just a bit of sun went a long way to help warm temperatures into the mid-80s many spots, with a few upper 80s thrown in. A cold front now swinging through the area is already helping to bring humidity levels back down and temperatures will follow. Rain chances remain very low headed into evening as readings fall back into and through the 70s.

Radar: Latest D.C. area 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: We stay mostly cloudy overnight, but some clearing could be noted by morning. I don't expect much if any rain for the area, but places south and southwest of D.C. may see a shower or two. Lower dew points should allow temperatures to fall lower than recent nights -- low 60s in the cooler spots to upper 60s in the city.

Tomorrow (Friday): You will notice the cooler air as we close the work week tomorrow. We may see some sun, but if the front gets hung up close we could still see a fair amount of clouds and even a few showers. Highs should shoot for the mid-70s -- not too far from normal this time of year.

See Josh Larson's full forecast through the beginning of next week. And if you haven't already, join us on Facebook and follow us on Twitter.

Australian Dust Storm: If you caught any news yesterday, you likely heard about the major Australian dust storm that hit Sydney and other portions of the country quite hard. The worst dust storm in 70 years, authorities in the region estimate that millions of tons of sediment were moved during the storm. Boston Globe's The Big Picture has an awesome set of imagery showing what it was like the day the sky turned red.

By Ian Livingston  | September 24, 2009; 3:15 PM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: D.C. Rain Linked to Intensity of Hurricane Season?
Next: Natcast: Clearing Skies, Cooling Down


Quite off-topic but for anyone who's interested I have some *unofficial* sea ice minimums for this summer as we've started to freeze up quite a bit.

On the IMS Daily Analysis we reached minimum on Sept. 11th at 4.8749 million square KM.

On the Navy's daily analysis there was a minimum of 5.85 million square KM, falling on Sept. 15th, though I'm not positive on the date.

The AMSR-E sensor's minimum occured on Sept. 13th and bottomed out at 5.249 million sq. KM.

Finally, NSIDC put out a preliminary minimum of 5.10 million sq. KM, reached on Sept. 12.

Posted by: Brian-CapitalWeatherGang | September 24, 2009 4:24 PM | Report abuse

Interesting...but they are saying that ice melt, especially in Greenland and Antarctica has been accelerating radically.

[This seems to conflict with recent readings from Summit Station, Greenland which has been recording temps as low as minus-41 Fahrenheit recently.]

Posted by: Bombo47jea | September 24, 2009 6:59 PM | Report abuse

As always, the images from "The Big Picture" site are friggin' amazing. They look like the surface of Mars!

Posted by: jburksva | September 24, 2009 8:27 PM | Report abuse

I think the cold front has dissipated. Once again, we missed out of any showers today. We DID get a wind shift late this morning, with a couple of degree drop in dew points, but it was very weak. The Bermuda High off the coast is simply too strong....aided by the southerly flow on the east side of the big cut-off low to our west. NWS has underestimated the potential strength of this southerly flow and warm-weather regime for several days now.

Face it, guys, we're not going to get much of a change...or cooler temps....until that big high off the coast weakens and moves off.

Posted by: MMCarhelp | September 24, 2009 9:27 PM | Report abuse

Well, guys, it looks like the high finally DID break down.....Geez, it's about time. It's nice and cool today...with much-needed moisture.

Posted by: MMCarhelp | September 25, 2009 12:18 PM | Report abuse

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