Central Washington University

Extreme Heat

Extreme Heat often results in the highest number of annual deaths among all weather-related hazards. In most of the United States, extreme heat is defined as a long period (2 to 3 days) of high heat and humidity with temperatures above 90 degrees. In extreme heat, evaporation is slowed and the body must work extra hard to maintain a normal temperature. This can lead to death by overworking the human body.

Remember that...

Extreme heat can occur quickly and without warning.
Older adults, children, and sick or overweight individuals are at greater risk from extreme heat.
Humidity increases the feeling of heat as measured by a heat index.

If you are under an extreme heat warning

What you can do

Find air conditioning
Avoid strenuous activities
Watch for heat illness
Wear light clothing
Check on family members and neighbors
Drink plenty of fluids
Watch for heat cramps, heat exhaustion, and heat stroke
Never leave people or pets in a closed car
Salt tablets should only be taken if specified by your doctor

How to stay safe when extreme heat threatens:

Prepare now

Find places in your community where you can go to get cool
Cover windows with drapes or shades
Weather-strip doors and windows
Use window reflectors, such as aluminum foil-covered cardboard, to reflect heat back outside
Add insulation to keep the heat out
Use attic fans to clear hot air
Install window air conditioners and insulate around them
Learn to recognize the signs of heat-related illness

Be safe during

Never leave a child, adult, or animal alone inside a vehicle on a warm day
Find places with air conditioning. Libraries, shopping malls, and community centers can provide a cool place to take a break from the heat
If you’re outside, find shade. Wear a hat wide enough to protect your face
Wear loose, lightweight, light-colored clothing

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