A high-pressure dome of hot, humid air is parked over the middle of the U.S. right now, driving temperatures up and heat indices up higher. But here in downtown Chicago, something weird happened this afternoon.
Around 1pm, a line of thunderstorms came down Lake Michigan from the north. Just before then, it was 33°C at O'Hare with a heat index close to 38°C. Then, within fifteen minutes, this happened:
Note the green lin snaking from Gary, Ind., in the southeast around to Crystal Lake, Ill., in the northwest. That's an interface between cool air coming off the lake and the hot, muggy air surrounding it. And it's still raining there; here's the radar image from 3:50:
So right now, it's 25°C in Gary, 24°C in Lansing, Ill. (near Gary), and 33°C in Joliet (near the + sign on the radar images).
Weird. And welcome, at least in the Loop. But the temperature is climbing again as the thunderstorms make their way deeper into Indiana. And tomorrow's forecast predicts more humid heat. Bleah.
Much of the central U.S. is bracing for the worst heat wave since 2013:
Temperatures [in Chicago] Thursday are expected to reach 34°C and 37°C on Friday, with humidity levels creating a heat index that feels more like 38-42°C, according to Kevin Donofrio, meteorologist with the National Weather Service.
The heat wave will continue through the weekend, with temperatures only a few digits lower during the day Saturday and Sunday and remaining around 25°C and even 28-29°C overnight, Donofrio said. Temperatures are expected to drop early next week.
It's already starting. I'm heading to Wrigley Field in a couple of hours, and the temperature has already hit 30°C at O'Hare with a heat index of 31.6°C.
WGN has an informative graphic explaining why this is happening.
We had perfect weather this weekend, including for last night's performance of Mahler's 2nd, and it's still pretty epic, which is why I haven't posted a lot. Except for a brief interval to do a stupid task in my office, and after catching up on Game of Thrones, it's time to take a walk. Not sure when I'll be back.
I haven't hit 25,000 steps since March 8th, and I've only hit 30,000 steps once. I don't think I'll hit either today, but if I do, I'll blog about it.