The National Weather Service developed the
heat index to help people identify days when the risk
for a heat illness is higher than normal. During a heat wave, the heat index is
excessive for many days in a row. Everyone has an increased risk for a
heat-related illness during a heat wave.
A heat-related illness can be more serious for:
Older adults, who may not notice excessive heat,
do not sweat as effectively, or do not feel thirsty.
This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the
How this information was developed to help you make better health decisions.