Severe Thunderstorms and Excessive Rainfall in the Central U.S.; Heat Building in the Western U.S.

A cold front pressing east across the central U.S. will be the focus for areas of strong to severe thunderstorms and excessive rainfall through this weekend. Strong to severe thunderstorms my bring damaging winds, hail, and a few tornadoes while excessive rainfall may lead to areas of flooding. Heat will build across the western U.S. with heat-related watches, warnings, and advisories issued. 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.