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Posted at 3:15 PM ET, 09/23/2009

PM Update: Mild Through Tomorrow; A Shower?

By Ian Livingston

Warmth to get booted by cold front late Thursday

* NatCast | Lackluster Hurricane Season Continues | D.C. Sunrise *
* New! Get CWG's Express Forecast by E-mail: Sign Me Up *

While it's the first full day of fall, high humidity and warm temperatures combined to produce a late-summer feel to the air. Despite the threat of some showers, most spots have not seen much rain the past few days even though some forecasts (not so much here) have called for such. That same general idea works today, though we could still see an isolated shower or storm into evening. Highs that rose to the low-and-mid 80s will be slow to cool thanks to high humidity and clouds.

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: It looks like a warm and muggy evening with the outside risk of a shower. We should lose the shower chances after midnight but a stray sprinkle is possible. As dew points remain high and skies stay mostly cloudy, overnight lows should only fall to the mid-60s in cooler spots to around 70 in the city.

Tomorrow (Thursday): We see more clouds and probably breaks of sun Thursday with a chance of afternoon showers or storms, mainly south of the area, as a cold front moves through. It should again be quite warm -- almost hot given the time of year -- as highs rise to the mid 80s many places, with maybe an upper 80 or two. More typical late-September air starts filtering in by evening.

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

DCHenge: Maybe you've heard about NYC's Manhattanhenge -- two days each year when the sun sets right down the middle of the street grid. Tonight is "DCHenge." Same general idea, different city. Tonight, the sun will set right down the middle of Washington's lettered streets. Though we lack the tall buildings of NYC that help produce the effect, the Washington City Paper reports that prime spots to see DCHenge are K and L streets.

By Ian Livingston  | September 23, 2009; 3:15 PM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: Lackluster Hurricane Season Could Stay That Way
Next: UnitedCast: Mostly Cloudy & Mild


We have 40-50% chance of rain but where is the rain. Time and time again I'm convinced the so-called 40-50% is only as good as "VERY slight chance of rain. don't count on it at all". I don't know where they get this 40-50% numbers as they just never live up to it!

Posted by: LoudounGeek | September 23, 2009 3:57 PM | Report abuse


Thanks for the comment. A similar comment was posted under this morning's forecast post. Will paste the response here as it seems to apply...

Not sure if you are talking about CWG forecasts specifically, or local media/NWS forecasts in general, but taking a quick glance at our forecasts here over the past few days, in most cases we've been very purposely downplaying the chances of rain with predictions of "a few showers" and percentages of 40% or lower, except for a Monday-for-Tuesday forecast of a 50% chance of showers (when indeed there were showers that passed through mainly the northern and western suburbs). You can review all of our forecasts here.

Posted by: CapitalWeatherGang | September 23, 2009 4:36 PM | Report abuse

Muggy air! Anyone out there enjoying this increased, summery humidity? Could this be our last run at a 70F dewpoint (tropical) airmass, for the season?? :)

Posted by: Camden-CapitalWeatherGang | September 23, 2009 4:50 PM | Report abuse

It would be nice for all of us if weather forecasting were more predictable.

Having said that, let's hear it for the uncertainty. It sure is more fun that way :-)

(And I'm on record for saying the forecasting here is generally good).

Posted by: jaybird926 | September 23, 2009 6:49 PM | Report abuse

Highs actually look more mid-to-upper 80s around a good part of the area. More sun today than I thought there would be yesterday for sure. From start to finish it did feel more like August than September around here.

Posted by: Ian-CapitalWeatherGang | September 23, 2009 7:07 PM | Report abuse

Off topic, but, the latest xkcd might amuse some of you.

Posted by: Murre | September 23, 2009 7:30 PM | Report abuse

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