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July Heat Wave Obs/Discussion


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The 12z GFS looks like the hottest run yet in the long-range. H85 temps reach 22-23C across all of Ohio by Friday afternoon and continue that high through at least the following Wednesday. In fact, Wednesday, July 27 has an area of H85 temps in excess of 24C over Pittsburgh.

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The 12z GFS looks like the hottest run yet in the long-range. H85 temps reach 22-23C across all of Ohio by Friday afternoon and continue that high through at least the following Wednesday. In fact, Wednesday, July 27 has an area of H85 temps in excess of 24C over Pittsburgh.

It could also be quite active up this way much of this week with us being on the east side of the ridge and the front hanging by.

My ideal type of summer weather personally, hot/humid and stormy.

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1983 is so underrated. Here's the 90+ streaks (min of 5) at LAF (airport) that summer.

7/11-24/1983: 95, 91, 93, 96, 93, 93, 96, 98, 99, 102, 102, 104, 100, 90

7/25/1983 had a 89, but was followed by this: 7/26-31/1983: 90, 91, 99, 99, 91, 93

So within one degree on one day of a 21 day heat wave. Regardless, 20 out of 21 days at or above 90. Impressive.

8/5-10/1983: 93, 91, 93, 96, 90, 93

8/18-22/1983: 93, 98, 100, 97, 90

Did you get those numbers from Wunderground?

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It could also be quite active up this way much of this week with us being on the east side of the ridge and the front hanging by.

My ideal type of summer weather personally, hot/humid and stormy.

Yeah, same here, I'm starting to get excited!

Also, we might have an earlier start to the heat wave than anticipated... Willow Run already 89 degrees as of the 12:53 update.

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I'm doubting whether we will get much above 95 during the next week. GFS thermal fields continue to run a little cooler and even if the warmer Euro ends up being closer, there's the evapotranspiration question. Locally, I expect peak heat index values of 107-115 every day next week.

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Today was never going to be that hot. The ridge is still building in the plains and has only started to push north and go into the northern plains.

Yeah, I agree. Today's just like a bonus for those places that reach 90. And a lot of places aren't too far from 90. Chicago and Detroit are at 87, Toledo is 88, Cleveland at 85 -- heck, even Buffalo, NY with a little more sunshine is at 89 today. Looking at the dewpoints though, I really got to wonder if all that humidity out west will reach us. I tend to doubt it and suspect dewpoints will generally be in the low to mid 60s, maybe rising to upper 60s/70 overnight for the eastern Midwest. So I don't think we'll get the oppressive heat/humidity that Iowa, Minnesota, Nebraska, etc. are experiencing. But still a week of 90s is pretty hot.

And I'm generally talking about Ohio, Michigan, northern Indiana, and Chicago. Central and southern Indiana and the rest of Illinois seem more prone to high humidity, so they'll probably see some days with dewpoints in the low to mid 70s. It just seems like the humidity usually mixes out further east when you get these big upper level ridges, because we don't have quite the density of corn as places further west.

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Looking like a historically hot July for some areas. The numbers for 2011 are month-to-date plus NWS point-click forecasts for each of their airports through the 23rd. So these are obviously subject to change, but it should give a good idea as to where we'll stand next weekend.

Toledo

1921 79.0

1916 78.6

2011 78.5**

Cleveland

1955 79.1

2011 77.7**

Mansfield

1934 77.0

1921 76.8

1955 76.7

2011 76.5**

And for Chicago and Rockford.

Chicago

1955 81.3

1921 81.2

2011 79.3**

Rockford

1921 80.3

1936 80.0

1955 79.4

2011 79.0**

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Lack of coordination...

Different opionions get you different places though.

post-147-0-43265800-1310847109.jpg

I don't think it's necessarily lack of coordination. I think LOT and other offices are expecting a bit of lake-enhanced front to cool things down just a bit Tuesday, preventing the need for a long-duration warning just yet anyways.

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Also the race will be on for hottest July nationally. The current record is held by July 1936. July 2006 was a close second (one-tenth of a degree cooler than 1936). Below is a comparison of this month to July 2006. Right now, it's safe to say we're below 2006. But I expect to tack on about 2 degrees to the departures in much of the Central & northern plains, upper midwest, and great lakes over the next week plus, so we should be pretty close by next weekend. Even the east coast should see an increase, albeit slighter than further east, perhaps averaging a degree.

July 2011

post-2666-0-86316300-1310847851.png

July 2006 (2nd hottest on record, 0.1F below 1936)

post-2666-0-26624600-1310847887.png

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http://forecast.weather.gov/showsigwx.php?warnzone=OHZ016&warncounty=OHC137&firewxzone=OHZ016&local_place1=3+Miles+ENE+Kalida+OH&product1=Heat+Advisory

NWS Northern Indiana have already issued excessive heat advisory for tomorrow. Excessive heat watch issued for mid-week.

NWS Cleveland has yet to issue any heat advisories/watches. Those will be coming eventually though one would think.

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http://forecast.weat...1=Heat+Advisory

NWS Northern Indiana have already issued excessive heat advisory for tomorrow. Excessive heat watch issued for mid-week.

NWS Cleveland has yet to issue any heat advisories/watches. Those will be coming eventually though one would think.

It's really difficult to reach the criteria from Cleveland east. 1 -- because it doesn't get as hot as northwest Ohio, and 2 -- when it does get really hot, the dewpoints tend to mix down significantly. With that said, I suspect at least NW Ohio will have heat headlines in the coming days and perhaps much of the rest of the CWA later in the week.

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Late day sun is giving us a spike. High will be at least 88 here.

I was looking back at some old obs and noticed a dewpoint of 84 in Moline on 7/30/99. That is one of the highest readings I can recall at an official site in the Midwest.

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Man, I really hope this doesn't last until September!

http://www.ctv.ca/CT...at-wave-110716/

"Above-average temperatures this weekend have many Canadians sweltering in the sweaty grip of a heat wave that is expected to last until September.

Environment Canada's forecast for the next month predicts there will be high temperatures for most of the country and even a reprieve from soggy conditions in the West."

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Late day sun is giving us a spike. High will be at least 88 here.

I was looking back at some old obs and noticed a dewpoint of 84 in Moline on 7/30/99. That is one of the highest readings I can recall at an official site in the Midwest.

Yeah I remember that heat wave. IIRC dews held near 80 most of the day, and we had that spike in the early evening. It felt like you were in a small bathroom after taking a long hot shower. VERY steamy.

Only made it to 88 here today. Peak heat index hit 93. Dews generally stayed around 70 all day. The oppressive humidity levels start just west of the QC. I'm sure tomorrow will be a different story.

EDIT: Just looked up the old ob for that date above. It was actually July 29. At 7pm it was 94/84 with a heat index of 122.:lmao:

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