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Late June/Early July Extreme Heat Episode


Hoosier

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Lol you always shave a few degrees off and torchatie adds 2-5°

I had a large cloud overhead when I typed that observation! lol, yeah it's 97° here now. Been just a slight difference, < 1° between here and UGN, which is almost 2 miles away. More shady areas in my neighborhood. More buildings and concrete at the airport could make slight difference.

Skilling saying the lake breeze could bust the cap this afternoon.

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This is odd. Cedar Rapids' temp has not risen in the last hour... still at 91. I guess that rules out 100.

Noticed that. MLI only went up a degree to 94 as well. Must be pockets of poor mixing from the Mississippi points west. Most temps west of the river are still in the low 90s.

For whatever reason it seems that MLI only overachieves on days when there's a cool front approaching. No explanation on why that would be, but I've noticed that to be the case over the years.

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I hear 101 at RFD so far.

Skilling is going 101 for ORD; looks like that's probably going to bust low.

ORD is running warmer than almost all guidance right now (even the NAM/ECMWF 2m temps) and the airmass only gets warmer in the next couple days.

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100 reached at ORD and Northerly Island. Just sent out a PNS. And the record for the date of 101 at RFD was already tied.

First year with at least 2 100+ days for Chicago since 1995.

Unless we level off soon, the record of 102 (1911) looks to be tied or broken given it's only 12:40PM.

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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.

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First year with at least 2 100+ days for Chicago since 1995.

Unless we level off soon, the record of 102 (1911) looks to be tied or broken given it's only 12:40PM.

Thanks for pointing that out, I'll resend the PNS with that info. And yup, at least tying the record seems like a good bet.

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If today is any indication then it's not inconceivable that ORD could manage 106 or 107 especially on Friday assuming the trend of the slower front is real.  Mixing gets even deeper in addition to having a slightly warmer airmass aloft. I wonder if we will see the rare mid 100's forecast from LOT in the next 1 or 2 forecast cycles.

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If today is any indication then it's not inconceivable that ORD could manage 106 or 107 especially on Friday assuming the trend of the slower front is real. Mixing gets even deeper in addition to having a slightly warmer airmass aloft. I wonder if we will see the rare mid 100's forecast from LOT in the next 1 or 2 forecast cycles.

Yeah this is gonna be one to remember for Chicago.

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