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

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

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.

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

We've been dry for a couple of days now and really will remain that way for another day or two, but now we have another heat wave on the horizon.

Palmetto State faces sweltering heat with indexes up to 111°F. Stay safe with precautions and stay updated with News19 WLTX.

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.