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Posted at 3:30 PM ET, 06/13/2010

Forecast: Heat & humidity make us sweat

By Brian Jackson

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* Any showers or storms out there? Radar & more: Weather Wall *

Today's Daily Digit
 
A somewhat subjective rating of the day's weather, on a scale of 0 to 10.
 
6The only thing I'd enjoy outside today would be a dip in the pool.
 
Get tomorrow's 'Digit' on Twitter tonight

EXPRESS FORECAST

Today: Partly sunny, chance of p.m. storms. Upper 80s, near 90. | Tonight: Mostly cloudy, t'storms diminish. 72-75. | Tomorrow: Continued heat and humidity, p.m. storms. 87-92. | A Look Ahead | Get Express Forecast by E-mail

FORECAST IN DETAIL

To quote on of my favorite comedians, "It's not so much the heat, it's the humidity that'll kill you." For the next two days, we'll have both. With this juicy air mass, thunderstorms continue to threaten our afternoon/evening periods before a cool front arrives in town late Monday. Alas, while conditions will be cooler and drier behind the front, we can't completely rid ourselves of rain chances Tuesday and Wednesday.


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.

Today (Sunday): Here we go with our second straight sticky day. Temperatures reach into the upper 80s to near 90 degrees with partly sunny skies. But the killer again will be dew points in the low 70s that make it feel about 5 degrees hotter. Once again, afternoon t'storms are possible (30-40% chance). Winds will be from the west at 5-10 mph, stronger near any storms. Confidence: Medium-High

Thundercast:
Probability: 30-40%
Coverage: Scattered, Isolated severe.

Tonight: Storm chances remain for the early portion of the evening and should slowly diminish overnight. Outside of these storms, skies should be mostly cloudy and overnight lows will be balmy, in the low-to-mid 70s. Winds will be out of the west-northwest at 5-10 mph. Confidence: Medium-High

Keep reading to see how long we'll stay sweaty....

Tomorrow (Monday): Partly sunny skies warm us to around 90, with humidity levels high for a third straight day. A cool front finally attempts to make some progress towards the area setting off some scattered afternoon thunderstorms. Winds will be from the west-northwest at 5-10 mph. Confidence: Medium-High

Tomorrow Night: The cool front works its way through overnight keeping chances for showers and thunderstorms in the forecast through around midnight. We should be in the clear by the early morning hours with gradual drying. Overnight lows will be a bit more hospitable, in the mid-to-upper 60s. Confidence: Medium

A LOOK AHEAD

Tuesday and Wednesday show a marked improvement. Behind the front, it won't be as gloriously dry as we saw early last week, but humidity levels drop and cooler temperatures offer a noticeable increase in our comfort levels. Skies should continue partly sunny with highs topping out in the low 80s. A developing wave along the remnants of our current front leads to afternoon shower chances around 20% on Tuesday and 40% on Wednesday. Confidence: Medium

By Brian Jackson  | June 13, 2010; 3:30 PM ET
Categories:  Capital Weather Gang, Forecasts  
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Next: Forecast: Muggy Monday, modest mid-week relief

Comments

An O's cast? Trying to weigh driving my pre-teen nephew up for a game (only one it seems he will be in town for) vs rain out or oppressive heat/humidity. TIA!

Posted by: johnslau | June 13, 2010 8:45 AM | Report abuse

Rather hazy out there. Weather Channel tells me it's 84 degrees.

There's an interesting-looking patch of activity on a tropical wave out in the central Atlantic near 5 to 10 degrees north. NHC may designate this as an "invest" or perhaps a tropical depression within 36 to 48 hours. Normally we should have a couple of months or so before the Cape Verde season kicks in.

Posted by: Bombo47jea | June 13, 2010 10:05 AM | Report abuse

There seems to be disagreement between CWG's forecast for today (30-40% chance of storms) and the NWS's forecast in the At-A-Glance widget (70% chance of storms).

Is that because their forecast appears to be for the DC core (per clicking the "National Weather Service" link in At-A-Glance) while the CWG forecast is for the entire metro area?

Posted by: rigeldc | June 13, 2010 10:07 AM | Report abuse

@rigeldc

While there is a reasonable chance of scattered storms today, we think NWS is overdoing the odds. 70% seems quite high based on the guidance we've reviewed.

@johnslau

Forecast for Baltimore same as here...mostly cloudy, hot, humid, with a 30-40% chance of storms. I wouldn't let the scattered storm chances scare you away.

Posted by: Jason-CapitalWeatherGang | June 13, 2010 11:36 AM | Report abuse

Centreville VA I've done my part to ensure rainfall here later today by watering the garden....heavily.
Perhaps I should wash the car as well.
Whew...it's hot.

Posted by: FIREDRAGON47 | June 13, 2010 12:42 PM | Report abuse

How and why do DC splits happen? I remember one last summer when there were dark thunderclouds north and south of DC and still dry in DC.

Does it show up in the #s, as in DCA consistently gets less rain in summer than BWI and, say, Lorton?

Posted by: kperl | June 13, 2010 12:45 PM | Report abuse

Once again, we're getting a mega-downpour in Stafford while points north and south remain dry. What is the reasoning behind us getting so much rain lately while DC and the immediate suburbs receive little or nothing?

Posted by: david_in_stafford | June 13, 2010 1:26 PM | Report abuse

Is this going to be the pattern for the summer? Three or four days of plus 90 weather followed by low 80s followed by three or four days of plus 90? I am not complaining about the low 80s, but I'd kill for some normal mid-high 80s vs these swings. If June is this bad, I am dreaded July and August.

Posted by: hereandnow1 | June 13, 2010 1:35 PM | Report abuse

Brief downpour in Cleveland Park.. little cell heading se across the city.

Posted by: Ian-CapitalWeatherGang | June 13, 2010 2:03 PM | Report abuse

Don't mind the hot days, at along as we get a nice soaking rain at end of the day to cool things down and keep the lawn and plants happy. Right now it's the worst combination.

Posted by: LoudounGeek | June 13, 2010 2:49 PM | Report abuse

It is beyond me how anyone could like this weather. It's awful. Have you noticed how dead/brown the grass is all over the city? Everything is already wilted, and it's only mid-June. I, too, dread the thought of this continuing for another two months.

While I relished all that snow this past winter, it's obvious that much of the moisture generated by those storms has already evaporated.

Rain, rain, where are you?!?

Posted by: TominMichiganParkDC | June 13, 2010 2:50 PM | Report abuse

Mid-Atlantic tropical wave has been designated "Invest 92L".

There's a 50% chance it could become T.D.#1 or possibly "Alex" this evening.

However, a northward move could break up the system, as wind shear evidently prevails north of latitude 15N. The system could move westward into the Caribbean north of South America where conditions are favorable for development.

Posted by: Bombo47jea | June 13, 2010 2:56 PM | Report abuse

@TominMichiganPark;

It's still green here in Arlington County, though the predicted rain events are underperforming. Yesterday nothing fell.

There still seems to be some groundwater from the snow here.

Posted by: Bombo47jea | June 13, 2010 3:01 PM | Report abuse

Of course this weather is uncomfortable (summers, except for rare exceptions like June and July of last year, almost always are in D.C.). But at least we don't have to worry constantly about having our roofs cave in, long power outages (except small scattered ones from T-Storms), and constantly haveing to remove snow from heat pumps, with no place to put it, like we did last February. It's hard to imagine anything worse than those 1 and 2-ft blizzards hitting every few days, and fear for the intrgrity of your house.

As much as I dislike D.C. summers with 90-degree temps and dew points in the 70s (and they can be awful), I made a pledge, after we got through those terrible blizzards, that I would NEVER complain about the heat again. And, I'm sticking to it.

Posted by: MMCarhelp | June 13, 2010 3:16 PM | Report abuse

MMCarhelp, I agree with you 100%. This past winter did the same to me!

Posted by: david_in_stafford | June 13, 2010 3:26 PM | Report abuse

We're tied #5 all time season-to-date on 90+ days at DC, though many of the top seasons overall didn't show on the list this early so I'm not sure there is anything to it yet.

Posted by: Ian-CapitalWeatherGang | June 13, 2010 3:35 PM | Report abuse

@kperl

The DC split is not a "real" phenomenon... there's no scientific data supporting it nor is there any legitimate scientific reason for it. I think it's purely anecdotal.

Posted by: Jason-CapitalWeatherGang | June 13, 2010 6:12 PM | Report abuse

The old timers in NW Montgomery County swear that the Potomac River (about 100 yards wide in this area) causes thunderstorms to fall apart. You cannot tell them differently.

Posted by: MKadyman | June 13, 2010 6:17 PM | Report abuse

Had a five minute shower at 6:30 then sun, then a 20 second shower, now that steamy feeling outside. This summer is definitely turning out different from last (not just the winter). Last summer I was able to get by with A/C on some evenings and off the rest (probably 15 evenings total). This summer I am mostly just leaving it on except for the few cool breaks. I set it to 80, but it stays dry enough that it doesn't feel too hot.

Posted by: eric654 | June 13, 2010 6:55 PM | Report abuse

90 degree days - we average 30 a summer. We have 11 already. Next week looks good for another couple. How about we get mid way to our season average just 15 days into official summer? LOL

Posted by: LoudounGeek | June 13, 2010 8:31 PM | Report abuse

The comments to this entry are closed.

 
 
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