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The great July heat wave of 2013


Ian

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the east answer is dewpoints -- most of the great lakes has been quite wet and the vegetation is completely unstressed, the mid level ridge didn't originate over the dry SW, the low-level source region has been either GoM or Atl., the strength of the mid-level ridge has trapped this moisture which is being supplemented by high evapotranspiration rates over high soil moisture regions. 

 

also another point about the non-stressed vegetation is that vegetation will continue to transpire after solar radiation has ceased, it has an inertial component that continues to pump water vapor into a developing noctural BL raising dewpoints in the period after sunset which also might be helping to keep mins high -- i think the general takeaway is that an anomalous heat ridge over wet soil leads to over-performing mins and under-performing afternoon maxes

 

The other point about the midwest is that the corn really pumps moisture into the air, that's why you can see an 80 dewpoint in Iowa a lot more frequently than here. 

 

Here's a really nice piece on evapotranspiration and the corn belt.

 

http://www.weather.com/outlook/weather-news/news/articles/evapotranspiration-corn-belt-humidity_2011-07-13

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If anyone says it doesn't feel that bad outside I will come and light you on fire.  I'm beginning to hate drinking water.

I walked 6 miles this am, but finished at noon....it was getting pretty toasty.

Two closest wxbug sites have 91/70 and 91/69...I have 88.9 and 69.7.

At least its not raining, yet.

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If anyone says it doesn't feel that bad outside I will come and light you on fire.  I'm beginning to hate drinking water.

 

Normally I would agree with you, but just spent the most wonderful morning up at Cunningham Falls swimming at the lake. Pleasant 86 deg with a decent breeze. Did not want to leave but had to be back down in Frederick by 12:30. Just 8 miles back temp went to 96 on my car reading, almost pulled a u-turn to head back. :)

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If anyone says it doesn't feel that bad outside I will come and light you on fire.  I'm beginning to hate drinking water.

 

its muggy out, no question about it, but i still prefer this over 30 degrees and spending a week tracking a clipper.  i'm pretty sure i have some kind of seasonal affective disorder.  the only thing i enjoy about winter now is a snowstorm, but i enjoy most of what summer offers.

 

my secret to this weather is starbucks black iced tea or berry hibiscus refresher.  they come in handy.  having access to a pool is also a clutch maneuver.

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The "cool-down" this weekend is starting to look a little bit lame, and pretty much dependent on clouds/precip. A 4th consecutive Top-10 warmest July is in play.

I love warmth, but I'm getting tired of having top-whatever heat year after year.

I'm watching the little one this week and I'm not really up for getting her out and about with 100* heat indices. It pretty much sucks.

At least I can watch the British Open.

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ignoring a discussion on the merits of heat index (or lack thereof), anyone know what is the highest HI observed at KDCA?

July 16, 1980 - 103/78 (122); July 22, 2011 - 102/78 (121)

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You have a super-secret source that gets the temps first?

 

94.3 at home - high on the year

wunderground seems fastest from what I've tried. They usually get by 54 or 55 after.

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