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Posted at 3:15 PM ET, 05/28/2010

PM Update: Some more rain through tonight?

By Ian Livingston

Brief cool down heads back hot for Sunday/Monday

* Don't Fry Day | A cirrus and contrail display | StrasCast *
* Outside now? Radar, temps & more: Weather Wall | BeachCast *

The high heat and humidity of the last two days has temporarily been replaced by a cooler, yet still muggy marine air mass today. Highs reaching the mid-70s this afternoon look to be the coolest we'll see for a while as warm temperatures are set to return soon. After all the rain last night, most places have stayed relatively dry during the daylight hours today. The risk of showers or storms returns this evening and lasts into the night, though some spots may remain dry.

Radar: Latest D.C. area radar loop shows movement of precipitation over past three 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'll probably just see clouds and maybe an isolated shower through much of the evening, but a more widespread mass of activity may move toward us from the northwest by around 7 or 8 p.m. The risk of showers or storms then continues past midnight before waning in the early hours of Saturday. Any storms that move in shouldn't be as intense as yesterday, though there will be the potential for localized heavy rain. Temperatures drop to the low-and-mid 60s for lows.

Tomorrow (Saturday): We begin a transition back to hot and humid tomorrow, but it looks like clouds stick around late enough in the day to keep us from heading up too far in the temperature department. Highs should rise toward 80 across the area -- we'll stay in the 70s if sunshine holds off, and potentially reach the low 80s if it breaks out during the afternoon. There could also be an isolated shower or two at some point in the day.

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

More on hurricanes: CWG's Matt Rogers was on Bloomberg news this morning discussing NOAA's tropical outlook, released yesterday, for a busy hurricane season. Matt also offered insight into when and where we may expect to see large storms this year and touched on possible impacts of the Gulf oil leak on hurricanes and vice-versa.

By Ian Livingston  | May 28, 2010; 3:15 PM ET
Categories:  Forecasts  
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Next: UnitedCast: Diminishing shower chances, mild


As a technical detail, what is meant by an inch of rain? An inch deep in a container how wide? Obviously an inch of rain in the bottom of a swimming pool is a lot more water than an inch of rain in the bottom of a Mason jar.

What's the standard?

Posted by: mhardy1 | May 28, 2010 3:25 PM | Report abuse

Showers and t-storms dropping from due north to south about ready to enter Montgomery and Loudoun. I thought this was supposed to happen yesterday?

Posted by: MKadyman | May 28, 2010 4:05 PM | Report abuse

Mhardy1, Glad to see you on the board today.
I want to publicly apologize for how testy I was with you during the storms this past winter. I had no idea the situation you were dealing with and was a bit grumpy with cabin fever setting in. Again, sorry for the harshness. Dan

Posted by: dprats21 | May 28, 2010 4:37 PM | Report abuse


That initial surge from the north has fizzled (not totally unexpected, though for a little bit it was looking it might make it in here). Probably just isolated stuff for metro area for at least another hour or two. -Dan, CWG

Posted by: CapitalWeatherGang | May 28, 2010 4:53 PM | Report abuse

Yes I see that. It looked very promising until they fell apart.

Posted by: MKadyman | May 28, 2010 5:08 PM | Report abuse

to measure rain, make sure the measuring vessel has vertical sides. that's all. you're measuring the depth, not the amount of water. i suppose you should also make sure it's not shielded by trees/buildings etc...

a pool and a mason jar should yield the same measurement, right? as long as the sides are vertical?

Posted by: walter-in-fallschurch | May 28, 2010 5:23 PM | Report abuse

Traveling through lynchburg. Waiting out an incredibly heavy thunderstorm in the hotel lobby. Road was washed out, rt 311 I think. Hope you're missing this stuff back there, for the sake of my gutters if nothing else...

Posted by: jimfergusonj | May 28, 2010 6:08 PM | Report abuse

Centreville VA It so looks here like it's going to rain.
But nothing so far.
This is not a complaint. Centreville was super soaked last night. Would like to dry out some before the next thunder boomer.

Posted by: FIREDRAGON47 | May 28, 2010 6:32 PM | Report abuse

So we have season passes to King's Dominion and we were debating whether to go down tomorrow. Looking at the forecast for Ashland it looks iffy but going by what you said I'm not sure now. Do you think it's a safe bet that all rain is going to be gone by late morning and the temps are going to be in the high 70s-low 80s?

Posted by: paul-Sterling | May 28, 2010 6:46 PM | Report abuse


Temperatures should be fine down there, approaching 80 for highs. But chances for daytime showers and storms are actually a little better in the Ashland area tomorrow (around 40%) than here in the D.C. metro area (about 20-30%).

Posted by: Dan-CapitalWeatherGang | May 28, 2010 8:32 PM | Report abuse

Dan: Thanks for saying so, but it's not necessary. I was speaking more from stress than usual myself.

Walter: I'm not sure I understand. If I set out a pail 10 inches in diameter and a trash can 36 inches in diameter in the same rain, it seems like the water in the pail will be deeper than that in the trash can. Granted I have not tried this experimentally, but it seems right.

Posted by: mhardy1 | May 28, 2010 8:42 PM | Report abuse

Looks like we're gonna escape the rain tonite here in Ashburn. And that's great by me. Need some drying in my yard. Hopefully this is a sign that tomorrow the clouds will clear more quickly.

Posted by: ThinkSpring | May 28, 2010 9:09 PM | Report abuse

Who turned on the downpour?

Posted by: VAOrangeFish | May 28, 2010 10:50 PM | Report abuse

Quite the downpour right now in Merrifield! No thunder to go with it tonight, of course...I'm wide awake and just stocked up on Bolivian chocolate.

Posted by: --sg | May 28, 2010 10:52 PM | Report abuse

Localized heavy rain = feels like inside a car wash

Posted by: VAOrangeFish | May 28, 2010 10:55 PM | Report abuse

Very heavy rain showers in Columbia Heights West, 9:30-10:15pm...rate may be as high as 2 inches/hour or more...must have had 0.75 inch or more. Should wipe out any "precipitation deficits" the much-needed rain crowd is whining about. No lightning or thunder recorded though radar signature has been impressive.

Posted by: Bombo47jea | May 28, 2010 11:30 PM | Report abuse

Once again, we get no rain here in southern Prince William. "Nuttin Honey".

Posted by: southbridgemom | May 28, 2010 11:58 PM | Report abuse

Walter: I'm not sure I understand. If I set out a pail 10 inches in diameter and a trash can 36 inches in diameter in the same rain, it seems like the water in the pail will be deeper than that in the trash can. Granted I have not tried this experimentally, but it seems right.

Posted by: mhardy1 | May 28, 2010 8:42 PM

well, i guess that's where your "it seems" departs from reality: a 36" diameter and a 10" diameter will collected the same DEPTH (but not amount) of water. try it.

Posted by: walter-in-fallschurch | May 29, 2010 12:38 AM | Report abuse

I agree with the above post as long as the diameter of each container stays true all the way to the bottom. Obviously if one narrows, (like a funnel) then the water will be deeper.

Posted by: snowlover | May 29, 2010 3:31 AM | Report abuse

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