![]() ![]() This experimental tool is most useful for active, acclimatized people such as outdoor workers, athletes, and anyone else performing strenuous outdoor activities - and has been used for decades by military agencies, OSHA, and marathon organizers. With WBGT forecasts available by region up to 7 days in advance, it is a useful tool for planning ahead. It is the temperature you would see on your thermometer outside. A Dry bulb calculates the air temperature measured in the shade.Solar radiation heats the globe and wind blowing across it cools the globe. A black globe is used to measure solar radiation.This mirrors how the human body cools itself with sweat. As water evaporates from the cloth, evaporation cools the thermometer. A Wet bulb measures the temperature read by a thermometer covered in a wet cloth.It estimates the effect of temperature, relative humidity, wind speed, and solar radiation on humans using a combination of temperatures from three thermometers: WBGT is an experimental forecast tool indicating expected heat stress on the human body when in direct sunlight. Although outdoor physical activity may be unavoidable, heat-related illnesses and fatalities are preventable by using NWS forecast tools like Heat Index (which tells you how temperature feels to the human body in a shady area) or alternatively, Wet Bulb Globe Temperature (WBGT), before heading outside. Even a short period of exposure can be so taxing on the body that it results in a heat-related illness. ![]() Extreme heat is a major weather-related hazard. ![]()
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