Heat index values could reach as high as 106. Temperatures are expected to cool down later this week. Here's what to know about the forecast.

The National Weather Service has issued a heat advisory for South-Central Pennsylvania on Tuesday and Wednesday. The heat advisory will be in effect from 11 a.m. to 8 p.m. on both days for the entire Susquehanna Valley.

Dangerous conditions continue across Florida Tuesday, July 29, with most of the state under either extreme heat warnings or heat advisories.

The National Weather Service has issued a heat advisory for Ross County starting June 28 and continuing through July 30.

In state issued an air quality health advisory for Tuesday, with ozone, a mixture of air pollutants, being the pollutant of concern.

We’re expecting heat indices this afternoon in the upper 90s, low 100s at times,” explains 3News’ Senior Meteorologist Matt Wintz.

The National Weather Service has issued a heat advisory from 11 a.m. Tuesday through 8 p.m. Wednesday for much of central Pennsylvania, with heat index values potentially reaching 104 degrees. Temperatures will remain in the 85 to 95 degree range, approximately 10 to 15 degrees above historical averages and approaching daily record levels.

The National Weather Service has issued a heat advisory for Rhode Island and other parts of Southern New England.

On Monday at 5:57 p.m. EDT an updated heat advisory was released by the National Weather Service in effect until 10 p.m. EDT for Midland, Bay, Huron, Saginaw, Tuscola, Sanilac, Shiawassee, Genesee and Lapeer counties.