Heat kills by pushing the human body beyond its limits. In extreme heat and high humidity, evaporation is slowed and the body must work extra hard to maintain a normal temperature.

Most heat disorders occur because the victim has been overexposed to heat or has over-exercised for his or her age and physical condition. Older adults, young children and those who are sick or overweight are more likely to succumb to extreme heat.

Conditions that can induce heat-related illnesses include stagnant atmospheric conditions and poor air quality. Consequently, people living in urban areas may be at greater risk from the effects of a prolonged heat wave than those living in rural areas. Also, asphalt and concrete store heat longer and gradually release heat at night, which can produce higher nighttime temperatures known as the "urban heat island effect."

A heat wave is an extended period of extreme heat, and is often accompanied by high humidity. These conditions can be dangerous and even life-threatening for humans who don't take the proper precautions.

Before Extreme Heat

To prepare for extreme heat, you should:

• To begin preparing, you should build an emergency kit and make a family communications plan. 
• Install window air conditioners snugly; insulate if necessary.
• Check air-conditioning ducts for proper insulation.
• Install temporary window reflectors (for use between windows and drapes), such as aluminum foil-covered cardboard, to reflect heat back outside.
• Weather-strip doors and sills to keep cool air in.
• Cover windows that receive morning or afternoon sun with drapes, shades, awnings, or louvers. (Outdoor awnings or louvers can reduce the heat that enters a home by up to 80 percent.)
• Keep storm windows up all year.
• Listen to local weather forecasts and stay aware of upcoming temperature changes.
• Know those in your neighborhood who are elderly, young, sick or overweight. They are more likely to become victims of excessive heat and may need help.
• Be aware that people living in urban areas may be at greater risk from the effects of a prolonged heat wave than are people living in rural areas.
• Get trained in first aid to learn how to treat heat-related emergencies.

Know the Terms:

Familiarize yourself with these terms to help identify an extreme heat hazard:

Heat Wave - Prolonged period of excessive heat, often combined with excessive humidity.

Heat Index - A number in degrees Fahrenheit (F) that tells how hot it feels when relative humidity is added to the air temperature. Exposure to full sunshine can increase the heat index by 15 degrees.

Heat Cramps - Muscular pains and spasms due to heavy exertion. Although heat cramps are the least severe, they are often the first signal that the body is having trouble with the heat.

• Actions: Go to a cooler location. Remove excess clothing. Take sips of cool sports drinks with salt and sugar. Get medical help if cramps last more than an hour.

Heat Exhaustion:

• Signs: Heavy sweating, paleness, muscle cramps, tiredness, weakness, dizziness, headache, nausea or vomiting, or fainting
• Actions: Go to an air-conditioned place and lie down. Loosen or remove clothing. Take a cool bath. Take sips of cool sports drinks with salt and sugar. Get medical help if symptoms get worse or last more than an hour.

Heat Stroke

• Signs: Extremely high body temperature (above 103 degrees) taken orally; red, hot, and dry skin with no sweat; rapid, strong pulse; dizziness; confusion; or unconsciousness
• Actions: Call 911 or get the person to a hospital immediately. Cool down with whatever methods are available until medical help arrives.

Sun Stroke - Another term for heat stroke.

Excessive Heat Watch - Conditions are favorable for an excessive heat event to meet or exceed local Excessive Heat Warning criteria in the next 24 to 72 hours.

Excessive Heat Warning - Heat Index values are forecast to meet or exceed locally defined warning criteria for at least 2 days (daytime highs=105-110° Fahrenheit).

Heat Advisory - Heat Index values are forecast to meet locally defined advisory criteria for 1 to 2 days (daytime highs=100-105° Fahrenheit).

What you should do if the weather is extremely hot.

• Never leave children or pets alone in closed vehicles.
• Stay indoors as much as possible and limit exposure to the sun.
• Stay on the lowest floor out of the sunshine if air conditioning is not available.
• Postpone outdoor games and activities.
• Consider spending the warmest part of the day in public buildings such as libraries, schools, movie theaters, shopping malls, and other community facilities. Circulating air can cool the body by increasing the perspiration rate of evaporation.
• Eat well-balanced, light, and regular meals. Avoid using salt tablets unless directed to do so by a physician.
• Drink plenty of water; even if you do not feel thirsty. Avoid drinks with caffeine. Persons who have epilepsy or heart, kidney, or liver disease; are on fluid-restricted diets; or have a problem with fluid retention should consult a doctor before increasing liquid intake.
• Limit intake of alcoholic beverages.
• Dress in loose-fitting, lightweight, and light-colored clothes that cover as much skin as possible. Avoid dark colors because they absorb the sun’s rays.
• Protect face and head by wearing a wide-brimmed hat.
• Avoid strenuous work during the warmest part of the day. Use a buddy system when working in extreme heat, and take frequent breaks.
• Check on family, friends, and neighbors who do not have air conditioning and who spend much of their time alone.
• Avoid extreme temperature changes.
• Check on your animals frequently to ensure that they are not suffering from the heat.
• Go to a designated public shelter if your home loses power during periods of extreme heat. Text SHELTER + your ZIP code to 43362 (4FEMA) to find the nearest shelter in your area (example: shelter 12345).

Additional Extreme Heat Topics

• Prepare for Extreme Heat
• More Extreme Heat Safety Info
• Frequenlty Asked Questions about Extreme Heat

Understanding Air Quality Advisories and Staying Safe

• Air Quality: Click here to download an EPA guide to Air Quality and Your Health
  
• Ozone: Click here to down an EPA guide to Ozone and Your Health
  

National Weather Service

If you require more information about any of these topics, the following resources may be helpful.

An outline brochure describing the heat index, heat disorders and heat wave safety tips.

Related Websites

Find additional information on how to plan and prepare for extreme heat and learn about available resources by visiting the following websites:

• National Weather Service Heat Safety Tips
• American Red Cross Heat Wave Safety
• Center For Disease Control and Prevention
• ASPCA Heat Safety Tips for Pets
• Ready.Gov Heat Extreme Heat Safety
• AirNow Air Quality Conditions

Learn about the emergency plans that have been established in your area by your state and local government. In any emergency, always listen to the instructions given by local emergency management officials.

Learn How to Stay Informed Before During and After an Emergency.

• Prepare for Extreme Heat
• Staying Safe During Extreme Heat