Columbia faces oppressive humidity Sunday with heat index values up to 112 degrees and an Extreme Heat Watch already issued for a hotter Monday.

The National Weather Service has placed Evansville and huge swaths of the Tri-State under an "extreme heat watch" for Monday and Tuesday.

Heat advisory issued for Northeast Florida & Southeast Georgia with heat indices up to 112 degrees; extreme heat watch follows for Monday.

SUNDAY: Heat Advisory continues with highs 90-95, and feels like temps as high as 105. A few PM t-storms are possible. SUNDAY NIGHT: Partly cloudy, warm and very humid. Lows in the mid to upper

RALEIGH, N.C. (WTVD) -- Dangerous heat is returning to Central NC this weekend, marking the fourth heat wave of the year. It's expected to last through at least the middle of next week. With high temperatures in the 90s and near 100, combined with high humidity, the heat index could reach a dangerous 105 to 115 degrees.

Raleigh faces a Heat Advisory with heat index values up to 108, and an Extreme Heat Watch warning of values up to 112.

On Wednesday at 1:41 p.m. the National Weather Service issued an extreme heat watch valid for Friday between 10 a.m. and 8 p.m. for Eastern Montgomery and Lower Bucks as well as Delaware and Philadelphia counties.

The National Weather Service has issued an extreme heat watch, warning that as temperatures rise into the 90s, heat indices could eclipse 105 degrees.