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Late June/Early July Extreme Heat Episode


Hoosier

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Caplan set the lines for tomorrow. I went over for all.

UGN 98

ORD 101

PIA 103.

I'll say 97° for UGN. Sometimes those fronts move faster down the lake then they're forecast. Hit 92° today here .

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I'd say 95*F for Detroit and 105*F for Chicago.

I still have concerns about high cloudiness limiting the heating potential, at least somewhat.

We had high clouds all day today and made it to 90 with 850mb temps of 16-17c and 925mb temps of 24-26c. I think 95 is considerably low balling it with respect to both of those levels being forecast to be much warmer tomorrow. 850mb temps are forecast to be around 25c and 925mb temps around 32c with very good mixing.

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Winter of 1936...very nice!

NO! lol Winter of 1935-36 was nice, very cold and with a near-winter long snowpack...but 1936-37 was probably the most region-wide snowless winter ever to hit the midwest/northeast. Several big cities (Detroit, Boston to name a few) have their all-time futility mark set in 1936-37. Boston missed it this past winter by just 0.2", though Detroit more than doubled their 1936-37 total, as bad as this past winter was.

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From the IND AFD about next week...

WITH NO MAJOR PATTERN CHANGES...TEMPERATURES ARE EXPECTED TO REMAIN

WELL ABOVE AVERAGE WITH READINGS REMAINING IN THE 90S WITH POSSIBLY

A FEW MORE TRIPLE DIGIT DAYS.

Here a question, what's the record number of triple digit days for IND?

I'm sure I know who could find that answer.. :lol:

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Going with 101 for DTW , 103 YIP and 98 PTK.

I will go 99F tomorrow at DTW. Take the ridiculously low max 2m temp from the GFS (84), the probably-too-high 2m temp max from the NAM (106), difference is 22F, divide by 3, and give 2/3 lean towards the NAM. I will say 104F for YIP and 98 for PTK as well.

Detroits all time high is 105F set July 24, 1934, and they have hit 104F five times. Record high tomorrow is 104F set in 1934, so we very well may not even set/tie a record even though it will likely be our hottest day in 24 years.

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We had high clouds all day today and made it to 90 with 850mb temps of 16-17c and 925mb temps of 24-26c. I think 95 is considerably low balling it with respect to both of those levels being forecast to be much warmer tomorrow. 850mb temps are forecast to be around 25c and 925mb temps around 32c with very good mixing.

I thought DTWs max today was 88?

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I will go 99F tomorrow at DTW. Take the ridiculously low max 2m temp from the GFS (84), the probably-too-high 2m temp max from the NAM (106), difference is 22F, divide by 3, and give 2/3 lean towards the NAM. I will say 104F for YIP and 98 for PTK as well.

Detroits all time high is 105F set July 24, 1934, and they have hit 104F five times. Record high tomorrow is 104F set in 1934, so we very well may not even set/tie a record even though it will likely be our hottest day in 24 years.

Good points.

BUT. I wouldnt completely write off breaking that record given the intensity of this air mass. Looking at those highs to our SW today gives me hope of century cracking day. Have to factor in the downslope effect too.

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We had high clouds all day today and made it to 90 with 850mb temps of 16-17c and 925mb temps of 24-26c. I think 95 is considerably low balling it with respect to both of those levels being forecast to be much warmer tomorrow. 850mb temps are forecast to be around 25c and 925mb temps around 32c with very good mixing.

Technically, the bulk of the high clouds (which were never opaque) held off until after peak heating took place.

Th sun didn't begin to filter out here until 4PM, with completely clear skies through 2 PM.

That said, I would love more than anyone for temps to eclipse 100*F+, but I'm being pragmatic considring our climo in these typs of setups.

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Good points.

BUT. I wouldnt completely write off breaking that record given the intensity of this air mass. Looking at those highs to our SW today gives me hope of century cracking day. Have to factor in the downslope effect too.

Its really all for the record books. Will it be just the 7th time on record Detroit hits 104F+? Will we touch exceed the all-time high of 105F? Will it not even touch the rare century mark? Because honestly, to joe public it will feel the same whether its 98 or 103...hot as f***!

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If there's an area to watch for potential slight underperformance tomorrow I would say to watch for that area near the front where there will be better moisture pooling. Farther south is screwed though given their distance from the front and enhanced drought.

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A few 00z RAOBs vs NAM/GFS output (850 mb temps):

OAX:

Actual: 31.6C

18z NAM: 32C

18z GFS: 31.4C

TOP:

Actual: 27.0C

18z NAM: 31.6C

18z GFS: 32C

SGF:

Actual: 25.6C

18z NAM: 24.5C

18z GFS: 25.2C

Both models significantly underestimated 850 mb dewpoints at TOP which is why the temp errors are large there.

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The ESRL RR is much more realistic.

tbh I didn't even realize there was a difference between the two...let alone that it'd be this much of a discrepency

usatmpf2m018s.gif

vs

temp_2m_f18.png?_=1340845894168

Are they just initialized differently? Or are there some other slight differences between the two?

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