National Weather Service United States Department of Commerce

Severe Thunderstorms Across the Central Plains into the Central Great Lakes; Heat Continues Across the Central and Southern U.S.

Severe thunderstorms are possible across the Central Plains into the central Great Lakes Tuesday afternoon and evening. Damaging winds, large hail, and a tornado or two may occur. A Slight Risk (level 2 of 5) of severe thunderstorms is in effect. A heat wave will continue into Tuesday from the Great Plains into the lower Mississippi River Valley and in northern Florida. Read More >

Wet Bulb Globe Temperature

(Prototype -- not official -- availability not guaranteed)


New! Click here for regional and national WBGT forecasts

The Wet Bulb Globe Temperature (WBGT) is a measure of heat stress in direct sunlight, which is based on temperature, humidity, wind speed, sun angle, and cloud cover (solar radiation). This differs from the heat index, also called the apparent temperature, which is based only on temperature and humidity and is calculated for shady areas. If you work or exercise in direct sunlight, the WBGT is a good element to monitor. Scroll down for latest observations and forecasts.

(WBGT guidelines courtesy of the North Carolina High School Athletic Association)





WBGT Guidelines for the General Population:


WBGT Regions