Tropical Storm Man-Yi in the Western Pacific is starting to move away from Guam. Tropical Storm Warnings remain in effect for Guam and Rota due to lingering impacts from gusty winds and heavy rain. Red Flag Warnings have been reissued Wednesday for parts of southern New England due to critical fire weather from gusty winds and dry fuels. Read More >
The Heat Index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature. To find the Heat Index, look at the Heat Index Chart above or check our Heat Index Calculator. As an example, if the air temperature is 96°F and the relative humidity is 65%, the heat index--how hot it feels--is 121°F. The red area without numbers indicates extreme danger. The National Weather Service will initiate alert procedures when the Heat Index is expected to exceed 105°-110°F (depending on local climate) for at least 2 consecutive days.
* (Experimental) National WBGT Display *
* National Heat Risk Display *