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Posted at 10:35 AM ET, 08/22/2009

Forecast: Stormy Saturday, More Serene Sunday

By Jason Samenow

* Flash Flood Watch in Effect Through Evening *
* SkinsCast, NatCast and UnitedCast | Weather Wall *
* Bill's Big Waves | Where's Bill? Hurricane Tracking Center *

EXPRESS FORECAST

Today: Showers and t'storms likely. 83-88. | Tonight: Some showers and storms linger. 65-70. | Tomorrow: Partly sunny, slight chance of mainly a.m. showers. 82-86. A Look Ahead | Get Express Forecast by E-mail

FORECAST IN DETAIL

I know. It's a bummer. Saturday is here, outdoor activities have been planned, and yet more rain is on the way. And some spots may see lots of it. On the plus side, it won't rain everywhere all the time and there may be some windows of partial sunshine. But showers and thunderstorms will likely be numerous, especially this afternoon. Improvement arrives for the second half of the weekend with a waning rain threat and lower humidity.


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 (Saturday): A cold front will slowly push through the region, triggering widespread showers and storms. These showers and storms will be most numerous in the afternoon, but a few may be around in the morning and some will linger into the evening -- especially east of town. Rainfall totals should average around 0.75", though some areas could see considerably more. Considerable cloud cover will hold high temperatures mostly in the low-to-mid 80s, but a little sunshine could boost some locations a few degrees higher. It will remain very humid, with dew points in the low 70s. Confidence: Medium

Thundercast:
Probability: 70%
Coverage: Scattered-Widespread

Tonight: Showers and thunderstorms may continue well into the evening -- but should diminish in coverage, especially after midnight. Overnight lows will drop to around 70. Confidence: Low-Medium

Keep reading for the forecast for tomorrow and into early next week...

stormphoto_web.jpg
Storms light up the sky over the Capitol Mall yesterday. By CWG photographer Kevin Ambrose.

Tomorrow (Sunday): Finally, the steamy tropical air should begin move away with pleasantly dry high pressure working its way into the region. However, with the front clearing the region at a snail's pace, a few showers can't be entirely ruled out (20% chance) -- especially in the morning. Under a mix of clouds and sun, highs should reach the mid-80s. Confidence: Medium

Tomorrow Night: Partly cloudy and comfortable. Lows will range from the low 60s in the cooler suburbs to the mid-to-upper 60s downtown. Confidence: Medium-High

A LOOK AHEAD

Both Monday and Tuesday high pressure will take hold over the region, bringing seasonably warm temperatures and low to moderate humidity levels. Highs both days will be in the low-to-mid 80s, with overnight lows from 60-68 (suburbs-city). Confidence: Medium-High

By Jason Samenow  | August 22, 2009; 10:35 AM ET
Categories:  Forecasts  
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Next: Bill Accelerating Northward, East of Carolinas

Comments

CWG: your HAMweather and weather underground radar shows the past two hours of weather moving through. Is there any web site that shows much longer loops- like the past 24 hours? I would like to be able to watch the radar of last nights thunderstorms moving through the area.
Thanks!

Posted by: Etta- | August 22, 2009 9:42 AM | Report abuse


I second Etta's request on seeing radar from last night. We live on Capitol Hill and at 4:20 this morning were awoken by extremely violent and sustained thunder that was virtually simultaneous to the lightning.

My dog jumped up on the bed and sat on me for an hour. That storm is the talk of the dog park today.

Posted by: DagnyT | August 22, 2009 10:03 AM | Report abuse

@ Etta- Try the HAM Weather site's radar:

http://mapcenter.hamweather.com/radar/ptype/latest/er04c02.html?b=topo&s=640x480

Offers up to 24 hr loop.

Posted by: dprats21 | August 22, 2009 10:51 AM | Report abuse

Another 1.2" of rain overnight on south side of Rockville brings total to 4.17" since 1:30 pm Friday.

Posted by: DOG3521 | August 22, 2009 10:58 AM | Report abuse

Hey guys...getting married in seven hours!! Any last hope for 6 pm today in georgetown?!

Posted by: zim94 | August 22, 2009 11:20 AM | Report abuse

@zim94

I'm afraid showers and storms may be numerous around that time, but like yesterday, some areas will get hit harder than others...and it won't be raining everywhere all the time. At this point, it's not possible to pinpoint. So just keep your fingers crossed that there's a break in the action and have a blast. Good luck with everything and congratulations.

Posted by: CapitalWeatherGang | August 22, 2009 11:45 AM | Report abuse

The storm on Capitol HIll overnight was amazing. Absolutely still...no wind, no rain...and the most violent thunder i've ever experienced. The entire house shook from the sustained rumbling, interspersed with claps and cracks that sounded like trees or 2X4s being split and shattered.

Then a slow light rain began to fall. Luckily i fell back asleep.

Posted by: stantonpark | August 22, 2009 11:51 AM | Report abuse

Thanks dprats21! That site is just what I was looking for!

Posted by: Etta- | August 22, 2009 12:14 PM | Report abuse

CWG- what do you make of those storms approaching from the SW? They look to be a) headed right for us, and b) setting up an 'exciting' evening. Is there enough energy to be concerned with their strength later on? We received quite a drenching light show last night in Laytonsville area and were within the tornado warning area. Repeat?

Posted by: dprats21 | August 22, 2009 1:30 PM | Report abuse

Once again this comes at a VERY BAD time...dance night @ Glen Echo with the Tom Cunningham Band!!! I did luck out last night; went to the Arlington County Fair...now the problem is that of having to do with all this flash-flood, downpour & thunderstorm CRUD between 6 and 9 PM...basically the same issue as zim94 is dealing with regarding their wedding ceremony...sure wish the "much-needed-rain" crowd wouldn't keep setting up these precipitation messes to coincide with important dances, weddings, and other must-see events. They kept me out of the Columbia Pike Blues Festival back in June though the rain did let up for the afternoon that Saturday.

In a way you have to blame Hurricane Bill for the mess we're in today. If Bill weren't in the picture this cold front would have cleared out of the area overnight last night, and we would have clearing weather with low eighties and low humidity this afternoon.

Posted by: Bombo47jea | August 22, 2009 1:55 PM | Report abuse

Looks like lots of rain headed in.

Posted by: Ian-CapitalWeatherGang | August 22, 2009 1:58 PM | Report abuse

& I SURE DON'T LIKE that bright orange & red area coming at us currently on radar out of the southwest...Hopefully this "monster" will rain itself out by 6:30 PM!!!

Posted by: Bombo47jea | August 22, 2009 2:02 PM | Report abuse

I'm pretty sure the "much-needed-rain" crowd has no control over what the weather does.

Posted by: ana_b | August 22, 2009 2:31 PM | Report abuse

I'll echo the thoughts on the great storms from overnight! Talk about lightning. It kept me up until well close to 5, but for a while between 3:50 and 4:15, we had just continuous thunder and lightning out here in Arlington.

And yes, down south looks nasty...

Posted by: JJones-CapitalWeatherGang | August 22, 2009 2:32 PM | Report abuse

The comments to this entry are closed.

 
 
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