According to the American Red Cross, extreme heat has caused more deaths than all other weather events.
The following resources from U.S. Government agencies and nonprofit organizations can help you deal with this type of emergency.
Tips including checking air quality and limiting outside exposure
(Environmental Protection Agency)
Self-help measures and tips for dealing with periods of extreme heat
(Centers for Disease Control)
Advice on what you should do if the weather is extremely hot
Information about the heat index and ways to protect yourself from extreme heat
(National Weather Service)
Information fact sheet on what to do before, during and after a heat wave
(American Red Cross)