A Heat Advisory is in effect for the entire Chicago area as high temps and humidity combine to make a heat index well into the triple digits.

The National Weather Service issued a heat advisory at 3:03 a.m. EDT on Wednesday valid for Thursday between 11 a.m. EDT and 8 p.m. EDT for Isabella, Montcalm, Gratiot, Ottawa, Kent, Ionia, Clinton, Allegan,

The Pensacola area is under a heat advisory for the second day in a row. A cluster of showers and thunderstorms will offer relief on Wednesday.

The National Weather Service has issued a heat advisory starting Thursday, July 23, and continuing into Friday, July 24.

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

A heat advisory for Florida's Treasure Coast is in effect from noon through 6 p.m., with heat index values from 109 to 112 possible.

Extreme heat is settling in over Ohio, making it feel over 100 degrees. Here's the latest forecast and how you can stay cool.

The Southwest Ohio Air Quality Agency has issued an Air Quality Advisory for Butler, Clermont, Hamilton and Warren counties in Ohio; Boone, Campbell and Kenton counties in Kentucky; and Dearborn County in Indiana, until midnight. Levels of ozone within the region may approach or exceed unhealthy standards.