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Posted at 9:30 AM ET, 08/18/2009

Forecast: Heat Repeat With Some Storms

By Matt Rogers

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Today: Partly cloudy. 90-94. 40% chance of p.m. t'storms. Tonight: Scattered evening storms, then partly cloudy. 72-77. | Tomorrow: Partly cloudy. 40% chance of mainly p.m. showers/t'storms. 89-93. | A Look Ahead


Yesterday's high temperature of 91 downtown did not feel all that sticky. Indeed, relative humidity levels only ranged from 30 to 50% Monday afternoon with lower dew points. Today, we should see an unfortunate increase in those humidity levels. Along with more sun, it should feel like what we think of when we remember those "dog days" of August. And with the extra juice in the atmosphere, afternoon and evening thunderstorms chances are increasing...

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.

Today (Tuesday): A mix of clouds and sun are expected again today, but temperatures and humidity are expected to surpass yesterday. Look for highs in the low-to-mid 90s with heat indices in the mid-to-upper 90s. Some thunderstorms could rattle around the area in the late afternoon or evening (40% chance). A few of them, enhanced by remnant tropical moisture from Claudette, could be heavy rain producers. Confidence: Medium-High

Tonight: Scattered thunderstorms are possible, particularly before midnight. It will be on the muggy side with lows in the low-to-mid 70s. Winds from the southwest at 5-10 mph. Confidence: Medium-High

Keep reading for the forecast through the weekend...

Tomorrow (Wednesday): We'll still be on the hot side today but more widespread clouds and afternoon thunderstorms should limit the amount of hours we see our peak temperatures. Highs should be mainly in the low 90s and look for a 30-40% chance of afternoon to evening rumblers. Confidence: Medium

Tomorrow Night: Partly to mostly cloudy skies will continue with lows holding in the mid-to-upper 70s. We could see some lingering storms (30% chance). Winds will still be from the southwest at 5 to 10 mph. Confidence: Medium


Thursday will continue to watch the very, very slow arrival of a cold front. We should see an uptick in cloud cover and thunderstorm chances compared to Wednesday. Highs should range from the upper 80s to low 90s with a 40% chance of afternoon thunderstorms. Confidence: Low

Friday should be cold front passage day with an even greater chance of thunderstorms (60%) and temperatures a bit cooler (upper 80s to around 90). Look for partly to mostly cloudy skies. Confidence: Low-Medium

The weekend may still find unsettled weather around the area as a large cool upper level low works toward the area. Temperatures will respond to this new influence and we should see highs in the low-to-mid 80s (lows 60s to around 70), but we may not be able to completely clear out these clouds or the rain chances (30% chance of storms each day). Confidence is low on the details, but high on the break from the current heat situation. Confidence: Low

A look at next week shows a much different picture with cooler-than-normal weather around the area and reduced humidity.

By Matt Rogers  | August 18, 2009; 9:30 AM ET
Categories:  Forecasts  
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I am heading down to Williamsburg, VA on Saturday and then heading over to Myrtle Beach, SC on Monday for the week. Can someone take a "stab" at what the weather is going to to look like in Williamsburg on Sat and Sun, and in Myrtle Mon-Sat? Thanks!

Posted by: snowlover | August 18, 2009 7:25 AM | Report abuse

@snowlover - This is a public weather service site not your personal one. First it does only DC Metro, second, go to and get your info there.

Posted by: LoudounGeek | August 18, 2009 7:39 AM | Report abuse

Snowlover, weather in Williamsburg this weekend is looking to be partly cloudy with mid-upper 80s and a 30% chance of storms (per the National Weather Service). I worry that Saturday could surprise you to the hotter side (near 90 or slightly higher). Next week down in Myrtle is looking muggy with mid-upper 80s again and a usual chance of afternoon storms. -Matt

Posted by: MattRogers | August 18, 2009 7:43 AM | Report abuse

LoudounGeek, you're right our focus is on the local area here, but I'll offer another forecast when I can! -Matt

Posted by: MattRogers | August 18, 2009 7:45 AM | Report abuse

@LoudounGeek -- I have been a dedicated follower and active participant with CWG for over 5-6 years, back before they were associated with Washington Post. I have participated in reporting precipitation totals, and been involved in many of discussions. I am not sure if you are new to the site, but the CWG is not opposed to throwing out the occasional custom weather forecast when a dedicated follower needs one. So relax a little bit!

Posted by: snowlover | August 18, 2009 7:59 AM | Report abuse

Hey's our weddingcast looking for late afternoon Saturday? Any change from yesterday? You guys are the best!

Posted by: zim94 | August 18, 2009 8:00 AM | Report abuse

Hi Zim, the latest thinking has the cold front passing through the area around midday. That is good news as any showers/storms would be early (AM to lunch) and you'd have clearing skies potentially along with lowering humidity (highs 80s). Big risk next 2-3 days is to make sure that cold front doesn't slow down. But so far, not so bad! -Matt

Posted by: MattRogers | August 18, 2009 8:44 AM | Report abuse

Many thanks fiancee and I trust you guys implicitly!

Posted by: zim94 | August 18, 2009 9:55 AM | Report abuse

The big problem later this week is the bad timing of all this remnant rain from Claudette etc. with the Arlington County Fair. Honestly, we deserve fair weather for the Fair, and could probably wait a bit for the precipitation. BTW LoudounGeek seems to be another of the guys who's always trying to rain on me all the time.

Just noticed that Metro ridership is down. That's to be expected when we keep getting all those delays for "scheduled track maintenance". Most of this late-night stuff has no relationship whatsoever to the June accident & it's taking me over an hour to get home when I leave a dance at 10:30 PM. By comparison there has been little rain delay with my dance schedule this summer.

Posted by: Bombo47jea | August 18, 2009 12:18 PM | Report abuse

A short but beautiful rainfall tonight in Hyattsville. Bring on the rain!

Posted by: stuckman | August 18, 2009 10:42 PM | Report abuse

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