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August 2023 General Discussion


Chambana
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Here are some numbers to beat for the maximum observed heat index for each hour. Top is Omaha, and bottom is Des Moines. As you can see, the heat index of 116F at Omaha at 6 pm yesterday set a new record for that hour, and was just 4F below the all-time record of 120F, set on July 14, 1988 at 5 pm. The record heat index at Des Moines is 122F, on July 25, 1936, at 5 pm. No all-time hourly maxima have been set during the current heat wave so far.

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Here are the August numbers for DSM and OMA:

Des Moines - the 112F reading was the highest for the 3 o'clock hour. All-time record for the month is 114F, set on August 15, 1988, at 2pm and 4pm. A number of hourly maximum apparent temperatures were set just last year on the 3rd and 7th of the month.

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Omaha - easily the most impressive August heat on record, dating back to at least 1948. The 116F reading at 6 pm yesterday was one shy of the monthly record set on August 1, 2011, at 7 pm.

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Interesting to see 1936 with so few heat index records at Des Moines, despite the extreme temperatures. Looking at the data, looks like it had the fewest hours of dewpoints at or above 65F of any year. Some of the years in the late 1960s to mid 1970s might be lower, but they are shaded in blue indicating more than 20% of the data is missing. The only other comparable year is 2009.

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Also, one of the most hours below 60F, behind only 1944, 2009 & 2014.

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Second most hours below 50F, behind only 1940. And heck there were more of those in July 1936 than there have been in the entire past decade.

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Also the only year to accrue any hours with a dewpoint below 40F - 8 of those to be exact.

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39 minutes ago, cyclone77 said:

91/77/104 here right now.  Dews took a little longer to come back up after dipping to 57 early this morning, but 80+ tomorrow looks like a slam dunk.

Its hard to get 80 degree dews here with the cooler lake and lack of corn directly to the southwest, but 75+ dewpoints may creep in here tomorrow evening for the first time all summer.  I remember some upper 70s dews in early June last year and the year before which was unusual.  I don’t think the corn wasn’t anywhere near full grown then.  This year its barely gotten above 70 and most days its been in the upper 50s or low 60s.  Its been very comfortable compared to some years.

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3 hours ago, TheClimateChanger said:

Here are the August numbers for DSM and OMA:

Des Moines - the 112F reading was the highest for the 3 o'clock hour. All-time record for the month is 114F, set on August 15, 1988, at 2pm and 4pm. A number of hourly maximum apparent temperatures were set just last year on the 3rd and 7th of the month.

image.thumb.png.c5cbb59ced23a940b40b73941b0d1377.png

Omaha - easily the most impressive August heat on record, dating back to at least 1948. The 116F reading at 6 pm yesterday was one shy of the monthly record set on August 1, 2011, at 7 pm.

image.thumb.png.30705e2376358b41b71d31fc5b93dea4.png

Heat index reached 117F at Omaha’s Eppley Field at 7 pm, tying the monthly record also set at 7 pm on August 1, 2011.

Point-click for OMA has 103 and 101 next two days. If dewpoints stay as elevated as they have been the past couple days, could see 120F.

Des Moines peaked at 113F, one shy of the monthly record from August 15, 1988. And that goes all the way back to 1936. Point-click has temps of 101 & 98 at DSM next two days. Today’s high was 96F.

Just multiple days of a record-breaking combination of heat and humidity for the month of August. The duration has to be a concern, especially for any unhoused persons.

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18 minutes ago, OrdIowPitMsp said:

Maybe someone with experience working with ASOS data can help me out. The airport recorded numerous 5min obs of 98.6F, but the official high for the day is 98. Is there data smoothing/correction that occurs or something else?

The readings are converted from Celsius, but the 5 minute obs convert from rounded Celsius values. So the 98.6 is 37C, but the actual observed high was less than 36.9C.

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50 minutes ago, OrdIowPitMsp said:

Getting ready for work. We’ve reached our morning low of…..82. 

Good lord that’s a good start to hit the century mark. Hoping cloud debris clears for our shot here in Columbus area tomorrow. As Harry noted above going to be interesting feeling the dews creep up 10-15 degrees here in a few hours

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Wednesday is now looking like it'll likely be the hottest day of this period around here, and the hottest day of the year.
Back-door front timing for Thursday has been speeding up on most guidance, otherwise there would have had a higher temperature ceiling for then.

And the trend since reversed. Tomorrow has the best shot at 100+ we’ve seen in years.


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1 hour ago, hardypalmguy said:

Thinking MKE has a shot at 102 today.

What's the wet bulb temperature looking like? I'm beginning to think large portions of the country will be uninhabitable during summer by later this century due to increasing heat and humidity. I've heard wet bulbs around 91-95F (33-35C) are around the limit of human survivability. I mean sure you can escape inside to the air conditioning (as long as it is working), but who is going to live in a place where an extended power outage in the summertime is potentially fatal?

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