The National Weather Service heat advisory began at 11 a.m. Saturday for much of North Carolina, including the all of the Piedmont, Sandhills and Coastal Plain. Temperatures in the Triangle are in the 90s today, with a heat index higher than 100 degrees.

Heat is the deadliest weather threat, according to the National Weather Service’s report on weather-related fatalities. Here's how to stay safe.

Forecasters have issued a heat advisory for Friday in Miami-Dade, Broward and Palm Beach counties, with temperatures expected to feel like 105 to 111 degrees. The advisory is in effect from 11 a.m. to 6 p.m.