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Late June/Early July Extreme Heat Episode


Hoosier

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Looks like the whole week should be in the mid-upper 90's for Chicago. Wouldn't be surprised to see a day or two near 100.

Convection/clouds could be an issue for a day or two though.

18z NAM has ORD topping 100 tomorrow but obviously that could go out the window with clouds/storms.

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18z NAM has ORD topping 100 tomorrow but obviously that could go out the window with clouds/storms.

Indeed...Right around 102, with 100 for Tues.

Obviously clouds/storms could be an issue as you mention, but if not it will be interesting to see where we end up compared to it.

Today it had mid 90's, and if not for the MCS it seemed likely we would make it into that territory.

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We had a streak of 5 days of 95+ last year from July 19-23. If we beat that then it could end up being the longest streak since at least 1988 but can't say definitively as there is some missing data.

Some close ones at LAF, per your criteria.

June 16-20, 1994: 94, 94, 95, 97, 95

July 11-16, 1995: 93, 94, 98, 101, 99, 96

July 29-August 2, 1995: 95, 97, 97, 92, 95

August 12-19, 1995: 96, 97, 96, 94, 95, 93, 96, 95

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Some close ones at LAF, per your criteria.

<u>June 16-20, 1994</u>: 94, 94, 95, 97, 95

<u>July 11-16, 1995</u>: 93, 94, 98, 101, 99, 96

<u>July 29-August 2, 1995</u>: 95, 97, 97, 92, 95

<u>August 12-19, 1995</u>: 96, 97, 96, 94, 95, 93, 96, 95

Indeed. If we get through the next couple days then it seems likely to happen.

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15 days of 90º+ maximum temperatures for Indianapolis this year through June 30.

How it compares to past years at the same time, with the total number of 90º+ days from July 1 onward for each year in ( ). Period of record for this list is from 1897 to present.

19 in 1934 (27)

18 in 1954 (32)

17 in 1933 (25)

17 in 1988 (32)

16 in 1914 (25)

16 in 1952 (23)

15 in 1941 (30)

15 in 1953 (28)

15 in 2012

13 in 1913 (29)

12 in 1911 (20)

12 in 1994 (10)

And yes 1936 didn't make the list, just 8 days of 90º+ through June 30. And then 47 after, with 12 of those days being 100º+.

1983, the record holder (since 1897) with 58 total days, had just 4 days of 90º+ through June 30. July that year had 22, August had 23, and September had 9.

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Updated: All time hottest temperatures in recorded history for Evansville (since 1897).

Evansville

111º on 7/28/1930

108º on 7/13/1936, 7/26/1930

107º on 6/28/2012, 6/29/2012, 7/12/1936, 7/22/1901, 7/27/1930

106º on 6/30/2012, 7/7/1936, 7/12/1930, 7/14/1936, 7/15/1936

105º on 7/1/2012, 7/14/1954, 7/27/1952, 8/8/1930, 8/9/1930

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What's been noticeable about this heat wave here has been the relatively normal overnight lows. The past 5 days have had an average high of 92, or 10 degrees above normal. By comparison, the average lows have been 64.2, or just 1.2 degrees above normal.

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But low temps, thats a league of its own. The low temps at DTW from the time the official site changed in 1966 and on through the much of the 1980s was a radiating magnet, almost White-Lake-esque at times. When it came to high temps, some days DTW would be warmer, some days DET...but the difference in low temps was ASTRONOMICAL in those days, and it most certainly affected climate numbers in a HUGE way. Using the NCDC yearly clim summaries, I comparied the two sites for a few years picked at random just to show the difference. Unfortunately no DET numbers were published after 1982 on the site to compare the differences now, but just what I see on a daily basis, I would estimate that a full year would see DTW average between 0 and 1F WARMER than DET, not some 4F+ COLDER as it often did in the 1960s.

That's probably due also to how the area immediately around City Airport has deurbanizd (note how the neighborhoods immediately SW of the airport which had population densities of 15,000-20,000 people per sq. mile in the 1950s-1960s have reverted back to farmland/urban prairies), which allows for more efficient cooling, while the area around Metro Airport wasn't developed at all and now has urbanized as the population shifted from the city to the suburbs. It probably also has to due with the fact that Metro Airport has expanded quite a bit since the 1950s-1960s as it gradually took over the all of the air traffic from Willow Run and City Airport.

BTW, if we can see 90*F+ through Thursday, we would tie the official all-time record number of consecutive 90*F+ days (9 days), though we'd need 90*F+ through Sunday to actually break it (11 days in 1953, 12 days in 2012).

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What's been noticeable about this heat wave here has been the relatively normal overnight lows. The past 5 days have had an average high of 92, or 10 degrees above normal. By comparison, the average lows have been 64.2, or just 1.2 degrees above normal.

What I find unique about this heat wave is the fact that we have been reaching 90 here in Toronto with a staedy northerly and northwesterly breeze. Very unusual, although it's keeping the humidity and smog levels down and helping us to cool off at night. Best type of heat wave you can get in these parts!

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12z NAM has low to mid 100s here on Wed/Thu. Wouldn't go quite that high yet but not entirely out of the question given that we should basically be removed from clouds/precip and the mixing regime looks deeper than last time at least around here. Interested to see how temps perform in the next 1-2 days given the rain we've had in the area.

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12z NAM has low to mid 100s here on Wed/Thu. Wouldn't go quite that high yet but not entirely out of the question given that we should basically be removed from clouds/precip and the mixing regime looks deeper than last time at least around here. Interested to see how temps perform in the next 1-2 days given the rain we've had in the area.

If you don't get any rain between now and Wed, i have to image the evaportation rates will make any impact on Wed/Thur high temps minimal

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12z NAM has low to mid 100s here on Wed/Thu. Wouldn't go quite that high yet but not entirely out of the question given that we should basically be removed from clouds/precip and the mixing regime looks deeper than last time at least around here. Interested to see how temps perform in the next 1-2 days given the rain we've had in the area.

You sparked my curiosity, one Indy TV station is calling for 101, on Sunday. Another is calling for 90 on the same day......

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If you don't get any rain between now and Wed, i have to image the evaportation rates will make any impact on Wed/Thur high temps minimal

Probably, but for whatever reason LAF has been running cooler than surrounding areas even before the big heat set in. I got burned going super high here last time...not this time. :P

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Probably, but for whatever reason LAF has been running cooler than surrounding areas even before the big heat set in. I got burned going super high here last time...not this time. :P

LAF's cool biased, ORD's warm biased. It's all too weird.

So what's your first call for Wed/Thu...105/105? :popcorn:

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