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Posted at 5:00 AM ET, 07/21/2010

Forecast: Any hope for break in heat?

By Dan Stillman

Temperatures to get worse before they get better

* Heat weaves, then and now | Caribbean not so quiet anymore *
* Outside now? Radar, lightning, temps & more: Weather Wall *
* Consec days of 90+: 7; Total 90+: 37 (Apr: 2; May: 3; Jun: 18; Jul: 14) *

Today's Daily Digit
 
A somewhat subjective rating of the
day's weather, on a scale of 0 to 10.

 

Broken-record heat, humidity & storm chance is not only uncomfortable, but also kind of boring at this point.
 
Get the 'Digit' on Twitter

EXPRESS FORECAST

Today: Partly sunny & humid. 30-40% chance of showers/storms. Low-to-mid 90s. | Tonight: Very humid. 30-40% chance of showers/storms. 70s. | Tomorrow: Partly to mostly sunny. Slight p.m. storm chance. Mid-90s. | A Look Ahead | Get Express Forecast by E-mail

FORECAST IN DETAIL

This same old hot and humid pattern -- and it really is getting old at this point -- continues through the weekend. A comment left yesterday by CJWill1 probably sums up what many are wondering -- "How long can this pattern continue?? I know nothing about meteorology, but it would seem that this would have to break just based on history, odds, whatever." Unfortunately, there's no sign of any extended stretch of below-normal temperatures. The only real hope in the short term is that a cold front, due to arrive late in the weekend, has enough oomph to at least briefly knock the heat and humidity down a notch or two for early next week.


Radar & lightning: Latest D.C. area radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

Today (Wednesday): If I could highlight something noticeably different than yesterday's weather I would. But I can't. The same general pattern leads to mostly the same conditions today -- partly sunny, hot and humid with highs in the low-to-mid 90s. There's a 30-40% chance you'll run into a brief shower this morning and/or a shower or thunderstorm this afteroon or evening. A breeze from the southwest -- up to 10-15 mph at times -- takes the slightest edge off the heat. Confidence: Medium

Thundercast:
Probability: 30-40%
Coverage: Scattered

Tonight: A 30-40% chance of showers and thunderstorms sticks around through evening and possibly overnight. It's an uncomfortably humid evening, as you might expect, with temperatures slowly falling through the 80s on the way to overnight lows in the 70s. Confidence: Medium

Keep reading for the forecast through through the weekend...


Clouds roll by overhead as a weakening batch of showers and storms grazes the District and points south yesterday evening. Picture taken from the National Mall looking toward Virginia. By CWG photographer Ian Livingston.

Tomorrow (Thursday): We do have a couple differences for Thursday. First, higher pressure overhead means a little more sun -- partly to mostly sunny -- and reduced shower/t'storm chances. It's still hot with highs aiming for the mid-90s. But humidity may become more tolerable as the day goes on, and only a slight chance of an afternoon/evening shower or thundershower. Confidence: Medium-High

Tomorrow Night: Partly cloudy, a slight chance of an evening storm, and lows in the 70s. Confidence: Medium-High

A LOOK AHEAD

The heat kicks into a second gear for Friday and Saturday with highs probably in the mid-to-upper 90s, maybe near 100, and humidity on the rise again. That means afternoon heat indices over 100 are possible, along with a 20-30% chance of a mainly afternoon or evening shower or storm. Confidence: Medium-High

Some cloud cover associated with a cold front may keep temperatures down a little Sunday. Looks like highs in the low-to-mid 90s -- still with high humidity -- and a 30-40% of some showers and storms at some point during the day or evening. Confidence: Low-Medium

There's hope for highs only in the upper 80s to near 90 Monday and Tuesday and a step down to moderate humidity. But it depends on the strength of Sunday's cold front, which isn't known for sure as of yet.

By Dan Stillman  | July 21, 2010; 5:00 AM ET
Categories:  Forecasts  
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Next: In focus: The heat & humidity double whammy

Comments

175 people killed in South America cold spell

http://en.trend.az/regions/world/ocountries/1723309.html

Posted by: eric654 | July 21, 2010 5:58 AM | Report abuse

What a lovely day. At 7:25am the humidity is 93% and the dew point 72 degrees. That rates a 3? I'll rate it a negative 3.

Posted by: rwalker66 | July 21, 2010 7:27 AM | Report abuse

So happy to report a good quarter inch in the gauge last night when I got home late. Every storm had missed us since the weekend of the 10th ...

Posted by: weathergrrl | July 21, 2010 7:55 AM | Report abuse

Any hope for a break in the heat? Yeah - it's called September. I notice that later this week the temps are supposed to spike again; any chance of a drop in humidity?

Posted by: fleeciewool | July 21, 2010 8:03 AM | Report abuse

We've had a bit of very light rain here in Gaithersburg over the past 15 minutes or so.

Posted by: hawknt | July 21, 2010 9:23 AM | Report abuse

@fleeciewool

The potential Monday/Tuesday "cool down" (possibly to highs in the upper 80s to near 90) may also come with somewhat lower humidity, though still probably in the moderate range. But indications are we'll soon get right back into the higher heat and humidity as next week goes on.

Posted by: Dan-CapitalWeatherGang | July 21, 2010 9:55 AM | Report abuse

No good can come from this weather pattern. None.

Posted by: hobbes9 | July 21, 2010 10:11 AM | Report abuse

@ hobbes9 - My basil really likes this weather. So do the mosquitoes.

Posted by: FIREDRAGON47 | July 21, 2010 10:20 AM | Report abuse

Ugh... this does not bode well for outdoor activities I have planned coming up :( HEAT SUCKS!

Posted by: sigmagrrl | July 21, 2010 10:31 AM | Report abuse

At least we are no longer in a moderate drought, right? Despite the mosquitoes I hate, Firedragon47, I love more clouds and less blazing direct sun! Hobbes9, you really don't like this pattern?

Posted by: Camden-CapitalWeatherGang | July 21, 2010 10:33 AM | Report abuse

I've been lucky - gone running with my pooch every evening around 5:30 or 6, just as the clouds rollin. Halfway through, it downpours - usually while we're in the forest. Then clears up right when we come out to come home.

I'm cool with this pattern as long as it rains every afternoon!

But was born and raised in Florida...:)

Posted by: whitneyuevans | July 21, 2010 11:17 AM | Report abuse

@eric654

South America is evidently getting an extreme example of the "friagem", an Antarctic outbreak which can bring cool or cold weather as far north as the Amazon Basin in its most extreme cases. This friagem has also moved the ITCZ north of Panama into Nicaragua, giving the Panama Canal an equatorial outbreak and increasing the tropical cyclone development threat over the Caribbean. The last time this happened 20-odd years ago, the coffee crop in Brazil was heavily damaged, and coffee prices rose rather strongly.

The Antarctic produces more cold air than the Arctic in its winter season, but much of this cold air gets moderated by passage over the southern-hemisphere oceans. This is why friagems are rather rare and cold waves don't normally affect ocean-surrounded Australia and New Zealand.

Closer to home, this continual daily threat of severe weather is impacting my afternoon/evening activities--not just dances but other meetings, etc. Hope this daily threat [which is relatively a rare occurrence even in normally-wet Washington summers] abates soon.

Posted by: Bombo47jea | July 21, 2010 1:49 PM | Report abuse

Bombo, thanks for the clarifications. Another reason for the severity of the SH winter is distance from the sun (farther in our summer / their winter and closer in our winter / their summer). But you are right, the SH oceans are a tremendous moderating influence..

Posted by: eric654 | July 21, 2010 2:00 PM | Report abuse

I am still having to do extensive watering of my garden every other day and the plants are barely clinging to life. We have had almost no rain in Alexandria. We had the nice rain that Saturday (10 days ago), but since then, barely ground-wetting. We get the thunder, wind, clouds....and it blows over with no H2O. Awful.

Posted by: egengle | July 21, 2010 4:19 PM | Report abuse

The comments to this entry are closed.

 
 
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