Millions of Americans are under weather advisories this week. See which major cities have heat, flood or storm advisories.

Wednesday is a WVLT First Alert Weather Day. Our afternoon high temperatures will be hovering around 98 degrees, but it could feel closer to 107 stepping out the door. If you are working outside, make sure to take plenty of breaks in the shade and stay hydrated.

Heat index values will surge toward a dangerous 115 degrees in the central United States this week due to the combined effect of corn sweat and a heat dome. July has already been more humid than average, and now another, less obvious factor will enhance humidity this week: corn sweat.

Heading into Wednesday night, the comfortable nights are over, the humidity is still rising, and with lows in the low 70s, overnights will start feeling similar to how last week was. Skies will remain mostly clear throughout the night.

Dangerous heat & humidity build into next week. Bradford shows us when feels-like temperatures soar up to 110°.

TONIGHT: Expect a warm and clear night as the very spotty showery activity seen this afternoon fades through sunset. Temperatures gradually fall through the 80s after dinner and into the late evening. Overnight lows dip down into the mid 70s inland to upper 70s on the coast.