Late June 2025 Heat Wave

[Geoboy645]

The forecast has really zeroed in on a potentially quite significant heat wave for most of the subforum starting tomorrow and going through at least the weekend. At least 3-4 days of mid 90s over mid 70s dew points is going to cause heat index values to rise over 100 degrees over the weekend, especially in the Chicago and Detroit UHI's. While at this juncture it doesn't look like record highs are in jeopardy, the heat index and warm nights could cause some issues in the metro areas. This will probably be the most significant heatwave since the 2 day heatwave back in August 23. Figured that this is significant enough to warrant a thread of it's own.

Edit: As I was typing this out, ARX just put out an Extreme Heat Watch. With heat indexes up to 105 mentioned over the weekend.

[TheClimateChanger]

Good post. Although I do disagree with this part: "While at this juncture it doesn't look like record highs are in jeopardy..."

Below, is the current point-click forecast centered on DTW Airport. Record highs for Saturday through Tuesday are: 96, 98, 95, and 97. Record high minima are: 75, 73, 74, and 74. So this forecast would imply a new record high on Monday, June 23, and record high minima on Sunday, Monday, and Tuesday (tie). So I don't agree with that conclusion. Clearly, records are in jeopardy or else the NWS forecast is out to lunch. And this is just one location. I'm sure other locations will be at or near record high temperatures as well.

[Torchageddon]

DTX looks to be at 100F, just about on Mon, I'll be 92F. Top tier lows during the weekend/Mon - so far showing 22C-24C. I'm looking forward to it!

[OrdIowPitMsp]

2-3 days of 90s and dews in the 70s here then moderation and hopefully a ring of fire pattern. Of course it’s centered right on the weekend so the beaches will be absolutely packed.

[Harry Perry]

Generally speaking from heat-waves in the past with dews that high, the temps seem to under-perform a bit around here. Be interesting to see if that will happen this time around, especially after this deluge. 

[Baum]

4 hours ago, TheClimateChanger said:

Good post. Although I do disagree with this part: "While at this juncture it doesn't look like record highs are in jeopardy..."

Below, is the current point-click forecast centered on DTW Airport. Record highs for Saturday through Tuesday are: 96, 98, 95, and 97. Record high minima are: 75, 73, 74, and 74. So this forecast would imply a new record high on Monday, June 23, and record high minima on Sunday, Monday, and Tuesday (tie). So I don't agree with that conclusion. Clearly, records are in jeopardy or else the NWS forecast is out to lunch. And this is just one location. I'm sure other locations will be at or near record high temperatures as well.

unexpected convection and blow off cirrus will keep it in check....almost always does. It'll feel like summer,and the lighting bugs will prosper. Good stuff.

[roardog]

20 minutes ago, Harry Perry said:

Generally speaking from heat-waves in the past with dews that high, the temps seem to under-perform a bit around here. Be interesting to see if that will happen this time around, especially after this deluge. 

Yeah. If dewpoints really are in the mid 70s, I wouldn’t be surprised if we see a lot of low 90s for highs. Nights on the other hand are going to be awful.