Information Bulletin Number 0708093

Heat Waves Know What the Terms Mean
What To Do When a Heat Wave Is Predicted or Happening

Know What These Terms Mean
Heat wave: Prolonged period of excessive heat and humidity. The National Weather Service steps up its
procedures to alert the public during these periods of excessive heat and humidity.

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

Heat cramps: Heat cramps are muscular pains and spasms due to heavy exertion. Although heat cramps
are the least severe, they are an early signal that the body is having trouble with the heat.

Heat exhaustion: 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 may
suffer heat stroke.

Heat stroke: Heat stroke is life-threatening. 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.

Sunstroke: Another term for heat stroke.

If a Heat Wave Is Predicted or Happening...
Slow down. Avoid strenuous activity. If you must do strenuous activity, do it during the coolest part of the
day, which is usually in the morning between 4:00 a.m. and 7:00 a.m.
Stay indoors as much as possible. If air conditioning is not available, stay on the lowest floor, out of the
sunshine. Try to go to a public building with air conditioning each day for several hours. Remember,
electric fans do not cool the air, but they do help sweat evaporate, which cools your body.
Wear lightweight, light-colored clothing. Light colors will reflect away some of the sun's energy.
Drink plenty of water regularly and often. Your body needs water to keep cool.
Drink plenty of fluids even if you do not feel thirsty.

Water is the safest liquid to drink during heat emergencies. Avoid drinks with alcohol or caffeine in them.
They can make you feel good briefly, but make the heat's effects on your body worse. This is especially
true about beer, which dehydrates the body.
Eat small meals and eat more often. Avoid foods that are high in protein, which increase metabolic heat.
Avoid using salt tablets unless directed to do so by a physician.
Signals of Heat Emergencies...
Heat exhaustion: Cool, moist, pale, or flushed skin; heavy sweating; headache; nausea or vomiting;
dizziness; and exhaustion. Body temperature will be near normal.

Heat stroke: Hot, red skin; changes in consciousness; rapid, weak pulse; and rapid, shallow breathing.
Body temperature can be very high – as high as 105 degrees F. If the person was sweating from heavy
work or exercise, skin may be wet; otherwise, it will feel dry.

Treatment of Heat Emergencies
Heat cramps: Get the person to a cooler place and have him or her rest in a comfortable position. Lightly
stretch the affected muscle and replenish fluids. Give a half glass of cool water every 15 minutes. Do not
give liquids with alcohol or caffeine in them, as they can make conditions worse.

Heat exhaustion: Get the person out of the heat and into a cooler place. Remove or loosen tight clothing
and apply cool, wet cloths, such as towels or sheets. If the person is conscious, give cool water to drink.
Make sure the person drinks slowly. Give a half glass of cool water every 15 minutes. Do not give liquids
that contain alcohol or caffeine. Let the victim rest in a comfortable position, and watch carefully for
changes in his or her condition.

Heat stroke: Heat stroke is a life-threatening situation. Help is needed fast. Call 9-1-1 or your local
emergency number. Move the person to a cooler place. Quickly cool the body. Immerse victim in a
cool bath, or wrap wet sheets around the body and fan it. Watch for signals of breathing problems. Keep
the person lying down and continue to cool the body any way you can. If the victim refuses water or is
vomiting or there are changes in the level of consciousness, do not give anything to eat or drink.

Source: The American Red Cross