Heat Indicies

Storm Impacting the Northwest U.S.; Fire Weather Conditions in Southern California; Severe Weather in the South

A Pacific storm is bringing areas of low elevation rain, moderate to heavy mountain snow, and high winds to the Northwest. Strong Santa Ana winds and very dry conditions are producing elevated to critical fire weather conditions in southern California. Isolated strong to severe thunderstorms are possible through early Wednesday morning across parts of northeast Texas into western Tennessee. Read More >

Heat Index / Heat Disorders
Heat Index	Possible disorders for people in higher risk groups
130+	Heat stroke / sun stroke highly likely with continued exposure.
105 - 130	Sun stroke, heat cramps, or heat exhaustion likely, and heat stroke possible with prolonged exposure and/or physical activity.
90 - 105	Sun stroke, heat cramps and heat exhaustion possible with prolonged exposure and/or physical activity.
80 - 90	Fatigue possible with prolonged exposure and/or physical activity.

Heat Index / Heat Disorders

Heat Index

Possible disorders for people in higher risk groups

130+

Heat stroke / sun stroke highly likely with continued exposure.

105 - 130

Sun stroke, heat cramps, or heat exhaustion likely, and heat stroke possible with prolonged exposure and/or physical activity.

90 - 105

Sun stroke, heat cramps and heat exhaustion possible with prolonged exposure and/or physical activity.

80 - 90

Fatigue possible with prolonged exposure and/or physical activity.