The heat index could get as high as 111 in South Florida, with the strongest heat expected along the southern Gulf Coast.

Friday's heat index values will hover around 105 for Broward and Miami-Dade counties, but "feels like" temperatures could climb to as high as 111 degrees in parts of Southwest Florida. The heat advisory is in effect from 11 a.m. to 6 p.m.

The advisory is in effect from 11 a.m. to 6 p.m. While actual air temperatures will stay in the 90s, the mix of humidity and temperature, known as the heat index, will make it seem hotter - and more dangerous.