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Posted at 10:10 PM ET, 07/16/2010

PM Update: Dog days heat and humidity

By Ian Livingston

Fourth heat wave official, looks potentially lengthy

* Blizzards, heat waves... earthquake? | Storm that saved D.C. *
* Outside now? Radar, lightning, temps & more: Weather Wall *

Today starts our climatologically warmest time of the year as the average high hits 89. The true "peak" comes from the 19th to the 27th when our low averages 71 (compared to 70 right now). Right on cue, hot weather is here again. Highs today reached the mid-or-upper 90s most spots -- it's the fourth time highs this summer have reached 90+ for at least three straight days. Add in high humidity, and heat indices past 100 were not terribly uncommon. Unfortunately for those ready to ditch the heat, there is no major relief ahead.

Through Tonight: It's going to be a hot evening for any end-of-work-week activities scheduled, but it is Friday! Temperatures fall through the 90s this evening and toward the upper 80s after sunset. Overnight minimums reach the still-sultry mid-and-upper 70s. There could be a shower or storm roaming somewhere this evening or overnight, just don't count on much.

Tomorrow (Saturday): A weak cold front will begin to fall apart across the area and it's not going to bring much if any real relief to the heat. Mostly sunny skies through much of the day should boost temperatures back toward the mid-90s across the area. There will be a risk of showers or storms, mainly in the afternoon, but they should be isolated with many places probably staying dry.

See Camden Walker's forecast through the weekend. And if you haven't already, join us on Facebook and follow us on Twitter.

Earthquake weather: It's been hot and sultry, so I guess we should have expected what happened this morning. Folklore aside, NOAA announced that it's been hot not just here, but everywhere. June, April to June, and year-to-date global temperatures in 2010 ran the warmest ever since records began.

By Ian Livingston  | July 16, 2010; 10:10 PM ET
Categories:  Forecasts  
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Next: Forecast: Relentless heat & no sign of relief


Re: NOAA warmest June, etc. The announcement does note that "Sea surface temperature continued to decrease across the equatorial Pacific Ocean during June 2010, consistent with the end of El NiƱo." If they can say that, they should also have mentioned that El Nino made this the warmest year ever (or using UAH measurements, second warmest behind 1998)

Posted by: eric654 | July 16, 2010 3:37 PM | Report abuse

So if the peak of the heat is the 19th to the 27th, I can reasonably tell myself that it's going to start cooling off in a couple weeks, right? Right? Lie if you need to! I need hope, people!

Posted by: MadRabbitScientist | July 16, 2010 4:09 PM | Report abuse

MadRabbitScientist, hopefully. Though the long-rangers say years with a developing La Nina tend to have warmth last longer than normal. And AUG is usually pretty hot around here anyway.

Posted by: Ian-CapitalWeatherGang | July 16, 2010 4:31 PM | Report abuse

I was stuck indoors with snowdrifts during the winter, now the extreme heat keeps me indoors for summer. I am melting!! gr. i hate heat.

Posted by: Camden-CapitalWeatherGang | July 16, 2010 5:10 PM | Report abuse

LOL So even though Washington is the hotbed of partisanship, judging by these comments and the comments from last winter's snowstorms, DC residents are staunch moderates when it comes to the kinds of weather they prefer. Our weather presidential candidate would be a flip-flopping, middle-of-the-road, doesn't-take-a-stand-on-anything people pleaser. Yeesh.

Posted by: kolya02 | July 16, 2010 6:08 PM | Report abuse

JerryFloyd, I believe it was you (sorry if not), wanted to give an update on the top 10 heat days. We're at 98.5 right for an average high.

Posted by: Ian-CapitalWeatherGang | July 16, 2010 6:12 PM | Report abuse

I'm curious about the factors that are causing the fairly extreme nature of this heat. Obviously, DC is hot in the summer. The weather pattern we are in now of Heat, Haze, and Humidity is the standard summer weather pattern.

But in most summers this same weather pattern produces highs in the upper 80s to low 90s, with a few warmer days, not consistent mid 90s to 100 as we have been seeing. So what causes a pattern that would normally produce 88-90 to produce 98-100?

Posted by: jahutch | July 16, 2010 6:23 PM | Report abuse

Posted by: SteveT-CapitalWeatherGang | July 16, 2010 7:01 PM | Report abuse

It sure been a hard, hard winter
My feet been draggin' 'cross the ground
And I hope it's gonna be a long, hot summer
And the light of love will be burnin' bright

Posted by: blasmaic | July 16, 2010 8:04 PM | Report abuse

Centreville VA Thunder & lightning over the past hour.
No rain ....yet.

Posted by: FIREDRAGON47 | July 16, 2010 11:25 PM | Report abuse

Prepare for a nice little downpour to come thru parts of Fairfax county.

Posted by: FIREDRAGON47 | July 16, 2010 11:31 PM | Report abuse

High today at 1900 ft in the Blue Ridge Mtns was 89.1F... but it felt hot.

Currently 74F

Posted by: spgass1 | July 16, 2010 11:46 PM | Report abuse

Thunder and lightning (but no rain) in Mt Pleasant, DC. Came out of nowhere.

Posted by: rlintott | July 16, 2010 11:49 PM | Report abuse

How nice. Mother Nature has woken me up at midnight yet again with a shedload of thunder and rain. And I was having a nice dream related to the World Cup.

Posted by: Murre | July 17, 2010 12:09 AM | Report abuse

strong rain, loud thunder, and bright lightning in college park, dog is scared out of her mind; hopped in bed first, but now she has no idea what to do!

Posted by: kolya02 | July 17, 2010 12:23 AM | Report abuse

Finally got to the swing dance @ the Dulles Hilton this evening. The crowd was huge. Unfortunately, "much-needed rain" seems to have shown up as an uninvited guest...we drove through two heavy thunderstorms on the way back!

Posted by: Bombo47jea | July 17, 2010 12:34 AM | Report abuse

What do you mean, "Right on cue, hot weather is here again."? It's been hot on and off all summer. It didn't just show up yesterday, right on cue!

Posted by: msgerstein | July 17, 2010 1:09 PM | Report abuse

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