Scorching temperatures combined with the high humidity are expected Thursday, July 24, the National Weather Service stated in the advisory. The advisory will be in effect from 11 a.m. through 8 p.m., with the head index reaching a high of 105.

Dangerous heat will be followed by storms with damaging winds that could hit 65 miles per hour as a frontal system nears the Northeast. Heat-index values (combination of the temperature and humidity) on Friday,

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

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

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.

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

The heat index, or how it feels with humidity factored in, will rise into the triple digits for millions as the hot dome of high pressure engulfs the central and eastern states.

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. a moderate heat dome has developed over the Northeast.