Central Florida: It's hot, we know. But why isn't there an official warning?

Stock picture.
The OSH Act dictates that employers must protect workers from hazards at worksite, including heat-related hazards. 

What is the heat index? It's a single value that considers temperature and relative humidity. Since sweat does not readily evaporate and cool the skin, the higher the heat index, the hotter it feels. This is a much better measurement for outdoor workers or for people who will be exposed to heat because it estimates better the heat-risk one may experience.

HOW DOES IT WORK FOR CENTRAL FLORIDA?