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,

Feel the sweltering heat in South Carolina as a 'heat dome' brings 110-114°F indexes. Stay safe with tips and updates from News19 WLTX.

Temperatures in Milwaukee could reach as high as 94 degrees July 23 with a heat index of 105 degrees, and the heat is likely to stick around tomorrow. The National Weather Service forecasts a high in the low 90s and a heat index of around 100 for July 24.

Aside from the heat, scattered showers and severe storms arrive after 3 p.m. to 8 p.m. The main severe threat will bring damaging winds, alongside heavy downpours. Saturday will be another hot and humid day, with heat indices near 90. TONIGHT: Mostly clear, warm and sticky. Lows near 73.

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.

“Thursday remains on track to be the hottest day of the week; a heat advisory will likely be needed as the heat index reaches 100+ degrees,” NWS meteorologists in Detroit said today. “Scattered-numerous showers and storms then move in Thursday evening/night.”

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.