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Late June/Early July Extreme Heat Episode


Hoosier

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Interesting to see the stark contrast in conditions over a short area in northern IL. Freeport and Rochelle are both only at 92, but have dews at 75 and 77 respectively. Just north and east of those locations mixing is clearly better, with temps near 100 and dews in the 60s. Part of it may be the mixing may be the same at both locations, but due to the extreme amount of moisture being released in the areas to the south that the mixing is still inadequate enough to take care of the dews at the surface.

Close but I'd put it differently, it's cooler there due to more moisture being released for sure, but I think it's more along the lines of moist air has a higher heat capacity, so equal amounts of heating across a moisture gradient results in varying rates of temperature increase.

Taking a look at this: http://www.crh.noaa....RWR&issuedby=IL, I notice that the hottest locations (at 100-102) are the ones with the stronger winds and lower dewpoints. This suggests that mixing (or lack thereof) is critical today.

I think it's more exact to say that the hottest locations have stronger and deeper thermals and therefore stronger mixing, rather than stronger mixing leading to hotter temperatures.

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103 In Middleton, 102 in Janesville/Kenosha, 101 Rockford, 100 Watertown, Madison, Boscobel & Waukegan

Lately Kenosha has been beating most locations in the region. The Kenosha airport is as far west as the city limits go out by I-94 - about 7 miles from downtown.

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The DVN tropopause temperature from 00z yesterday evening was -70 °C at ~15.5 km, extremely cold and comparable to the tropics (though I often saw -80 °C in Miami). Let's see how cold it'll get today with these blazing temps, the hotter it is at the ground the more the troposphere inflates, and therefore the air at the tropopause is colder since it undergoes more expansional cooling before reaching it.

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Close but I'd put it differently, it's cooler there due to more moisture being released for sure, but I think it's more along the lines of moist air has a higher heat capacity, so equal amounts of heating across a moisture gradient results in varying rates of temperature increase.

I think it's more exact to say that the hottest locations have stronger and deeper thermals and therefore stronger mixing, rather than stronger mixing leading to hotter temperatures.

Agreed. Your explanation gets closer to the root of the matter.

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Lately Kenosha has been beating most locations in the region. The Kenosha airport is as far west as the city limits go out by I-94 - about 7 miles from downtown.

Makes sense, further inland rural area defined by continentality not as influenced from the Lake. On Another Note, Middleton just hit 104....

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I'd be curious to see what's causing certain areas to mix better than others. MLI didn't mix very well yesterday either, but on Monday they mixed out quite well. None of the models (that I've noticed) have handled this well at all. Many of the models (except GFS) show the whole area with deep mixing today.

EDIT: Jesus I can't type.

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I'm on vacation is Seattle now. Only in the low 70s here. lol

I see it's currently 98/72 back in GRR. My mother called and said she is attending a parade outside and it's absolutely miserable.

Jealous! Enjoy that nice air!

Good thing it doesn't get that hot there, most don't have AC.

:maphot:

101° here now, dewpoints steady. Cumulus starting to flare off now.

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103 at Kenosha Airport--getting closer to the all-time record. Still think it funny that at 1:03 they wrote

THE HOTTEST DAY LOOKS TO BE THURSDAY...WITH HEAT INDEX VALUES

MAINLY 100 TO 110.

Can't imagine Thursday being hotter than today...maybe I don't want to.....

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Why ORD will have a chance to make history:

12z NAM Skew-T's for ORD Thu/Fri afternoon:

post-14-0-77045700-1341431799_thumb.gif

post-14-0-77965000-1341431830_thumb.gif

Notice the dry adiabatic lapse rates from the surface to roughly 700 mb, which is even better than what was progged for today. Should this regime pan out then there is certainly a chance.

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