Ever notice how sometimes, it feels hotter outside than the thermometer says it is? It’s probably the heat index.

Ever notice how sometimes, it feels hotter outside than the thermometer says it is? It’s probably the heat index.

The heat index, or apparent temperature, combines air temperature and humidity to indicate how hot it feels to the body. High ...

Residents can use the NWS Heat Index Calculator to calculate what the heat index is locally. In addition, there is the Heat Index Chart with a wider range of temperatures and humidity percentages.

Residents can use the NWS Heat Index Calculator to calculate what the heat index is locally. In addition, there is the Heat Index Chart with a wider range of temperatures and humidity percentages.

Extreme danger: When the heat index is 125 degrees or higher, heat stroke is likely. Heat Index calculator Here's a chart to help you find out what the heat index is.

How is the heat index calculated? If you want to get out a calculator and figure out the heat index yourself, here is the formula, as published by Lans P. Rothfusz in 1990: ...

What is an extreme heat warning? An extreme heat warning is issued when dangerous heat is happening or about to happen. Residents are advised to take action.

Residents can use the NWS Heat Index Calculator to calculate what the heat index is locally. In addition, there is the Heat Index Chart with a wider range of temperatures and humidity percentages.