|Photo by Mario Gomez.|
The heat index is a calculated value based on humidity and temperature. You have all heard people say that they love the southwest because it is a "dry heat." They say that because the heat truly doesn't feel as harmful to the body if an area is humid.
A wet heat in places like Florida can be much harder on the body. That is why Florida and other humid hot areas will face some of the tougher health impacts than in other areas of the country due to rising temperatures in the coming century due to climate change.
When there is a heat index over 105 degrees people can experience heat cramps, heat exhaustion, and heat stroke.
The Union of Concerned Scientists developed an interesting tool that allows you to type in your location to find out the likely number of days above a certain heat index in your community at mid century or end of this century. Check it out here.