On Thursday at 2:04 p.m. EDT an updated heat advisory was issued by the National Weather Service in effect until 8 p.m. EDT for Iosco, Gladwin and Arenac counties.

Michigan is heating up this week. Two southwest counties are already under a heat advisory because of dangerous heat index values.

As of July 23, heat advisories were issued for lower Michigan. Here's how hot it will get on Thursday, July 24.