NWS Twin Cities/Chanhassen has Bloomington under an Extreme Heat Warning that runs until 9 PM Thursday, July 17. It's the latest extension of a warning the office has kept renewing since Tuesday night, first issuing an Extreme Heat Warning at 10:32 PM Tuesday, then again Wednesday morning at 1:04 AM and afternoon at 3:42 AM, before the current alert went out early Thursday at 1:04 AM.
The warning covers Hennepin County and puts heat index values around 100 degrees, per NWS. That combination of air temperature and humidity is what makes it a warning rather than a lesser advisory — and it's stuck around long enough that the office has been re-upping it roughly every 12 to 24 hours since Tuesday.
Overnight lows aren't offering much of a break either, according to the alert, which is part of why NWS kept the warning running straight through the nighttime hours instead of letting it lapse after sunset.
The warning is set to expire at 9 PM Thursday. Given how many times NWS has already extended it this week, it's worth checking weather.gov/mpx again Thursday evening before assuming the heat has broken.
For the next 12 hours and today's records, see Bloomington weather; for the days ahead, the 10-day forecast.
