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Posted on: June 13, 2018

Extreme Heat... Are You Prepared?

Be prepared for hot and humid conditions. These hot and humid conditions may lead to an increased risk of heat-related stress and illness, particularly for the very young, the elderly, and those participating in strenuous outdoor activities. 

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.”

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.
  • Heat Exhaustion - Typically occurs when people exercise heavily or work in a hot, humid place where body fluids are lost through heavy sweating. Blood flow to the skin increases, causing blood flow to decrease to the vital organs. This results in a form of mild shock. If not treated, the victim’s condition will worsen. Body temperature will keep rising and the victim may suffer heat stroke.
  • Heat Stroke - A life-threatening condition. The victim’s temperature control
    system, which produces sweating to cool the body, stops working. The body
    temperature can rise so high that brain damage and death may result if the body
    is not cooled quickly.
  • Sun Stroke - Another term for heat stroke.

Take Protective Measures

Before Extreme Heat
To prepare for extreme heat, you should:

  • 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.

During a Heat Emergency

The following are guidelines for what you should do if the weather is extremely hot:

  • 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.
  • 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. 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.
  • Protect face and head by wearing a wide-brimmed hat.
  • Check on family, friends, and neighbors who do not have air conditioning and who spend much of their time alone.
  • Never leave children or pets alone in closed vehicles. Car interiors can reach lethal temperatures in a matter of minutes. Beat the heat, check the back seat!
  • Avoid strenuous work during the warmest part of the day. Use a buddy system when working in extreme heat and take frequent breaks.

Cooling Centers
The below buildings are available as cooling centers during their normal operational hours:


DeKalb Senior Center

330 Grove Street

DeKalb, IL 60115

9:30 a.m. through 4:30 p.m. Monday through Friday


DeKalb Public Library

309 Oak Street

DeKalb, IL 60115

9:00 a.m. through 9:00 p.m. Monday through Thursday

9:00 a.m. through 6:00 p.m. Friday

9:00 a.m. through 5:00 p.m. Saturday

1:00 p.m. through 5:00 p.m. Sunday


If the above Cooling Centers are closed, Hope Haven is a no turn away shelter. Hope Haven is located at 1145 Rushmore Drive in DeKalb.

Call 911 to Request a well-being check for someone who may be suffering from extreme weather.

To locate a Cooling Center:
• Monday through Friday between the hours of 8:00 a.m. and 5:00 p.m., call 815-748-8460
• After hours or on weekends and holidays, call 815-748-8460 and press 9.