A heat advisory goes into effect Thursday for parts of Connecticut where heat index values will soar past 100 degrees on Friday.

Temperatures will soar to the upper 80s and low 90s Thursday as dew points climb in many areas, making the air feel thick and heavy. A heat advisory is in effect through Friday.

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.

Escambia, Santa Rosa and Okaloosa counties are under another heat advisory as a massive heat dome impacts over 100 million Americans.

How is the heat index calculated, and why is it more important than the air temperature during some heat waves?

Record-high minimum temperatures, in which temperatures don't drop in the nighttime hours, are likely across much of the U.S.

With heat index values expected to top 110 degrees, Knox County residents are urged to take precautions. Here's where to find cooling centers nearby.

Northeast Ohio is about to crank up the heat, with dangerous conditions expected Thursday as both temperatures and humidity soar.