The National Weather Service has issued a Heat Advisory for South Florida, promising sizzling days ahead, and emergency departments are already reporting an uptick in heat-related visits. When it

Those looking forward to a cool down during the season may have to take the brunt of the heat for a little while longer. A sprawling area of storms infused with tropical moisture is dropping heavy rain along the Gulf Coast and could produce significant flash flooding into the weekend.

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.