Late June 2025 Heat Wave

[hawkeye_wx]

Cedar Rapids only made it to 93º both days this weekend, with a dew in the mid 70s, pretty standard for a moderate heat wave.

[Chicago Storm]

Topped out at 94° at ORD and 95° at MDW on Sunday.

ORD had a low temp of 80° on Sunday, which broke the record high min temp for the date of 76°(1923/1908).

[sbnwx85]

RECORD EVENT REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
205 AM EDT MON JUN 23 2025

...RECORD WARM MINIMUM TEMPERATURE SET AT SOUTH BEND FOR JUNE 22ND...

A RECORD WARM MINIMUM TEMPERATURE OF 77 WAS SET AT SOUTH BEND 
YESTERDAY. THIS BREAKS THE OLD RECORD OF 74 SET IN 2024 AND 1988.

[TheClimateChanger]

Saginaw is now on day two of exceeding its previous all-time record high minimum. Crazy stuff.

[Torchageddon]

Yesterday I got to 33C/90F, Heat Index of 50C/122F, Humidex of 44C/111F. Air temp was standard for a heat wave but the humidity is extreme. I don't ken last year getting these values maybe not even for several years.

Overnight low under-performed at 23C, clear blue skies already 29C humidex of 37 . Point today also 33C.

[sbnwx85]

IWX kind of on an island issuing an Extreme Heat Warning but with the overnight lows being so incredibly warm, I think it’s the right call.

[Powerball]

43 minutes ago, sbnwx85 said:

IWX kind of on an island issuing an Extreme Heat Warning but with the overnight lows being so incredibly warm, I think it’s the right call.

To be fair, the bigger metros with UHI effect (Chicago, Detroit, St. Louis, Milwaukee, Pittsburgh, etc.) are also under Excessive Heat Warnings.

[roardog]

The impressive part of this heat wave is just the atmosphere staying well mixed during the night causing such high minimums. The fact that we're so close to the most daylight of the year probably helps too. The high temps haven't been anything special at all around here.

[OrdIowPitMsp]

79/66 currently with summertime cumulus. Big difference from this time yesterday when we were 91/74. 

[Chicago Storm]

To be fair, the bigger metros with UHI effect (Chicago, Detroit, St. Louis, Milwaukee, Pittsburgh, etc.) are also under Excessive Heat Warnings.

IWX is the only one out that way that issued CWA-wide. I think that was his point.