105-degree heat index, daily storm chances return to Illinois

“Heat indexes could approach or exceed 100 degrees Sunday through Tuesday,” the weather service said.

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ILLINOIS — Potentially dangerous heat is approaching the Chicago area, as heat index highs above 105 degrees are expected Sunday and Monday, according to the National Weather Service.

With the warm temperatures, daily thunderstorms are also likely to return.


Before the heat, however, Friday will have a high of 86 and should remain dry, before storms are expected daily on Saturday, Sunday and Monday, according to the current forecast.

Saturday will have a high of 89, and scattered afternoon storms are expected. There is a limited chance of thunderstorms on Saturday, with a level 1 out of 5 severe storm risk.

There is also a limited storm risk Sunday through Tuesday, in addition to a limited excessive heat risk.

“Heat indexes could approach or exceed 100 degrees Sunday through Tuesday,” the weather service said.

Sunday will have a high of 93, with a high heat index of 106 expected. Monday will have a high of 94, with a heat index high of 107, according to the weather service.

Storms are possible both Sunday night and Monday night.

Being safe in the heat

The Illinois Emergency Management Agency offers one list of refrigeration plants for those without air conditioning.

From IEMA:

  • Know terms used by the National Weather Service during extreme heat: heat wave, excessive heat watch, heat advisory, excessive heat warning, and heat index.
  • Stay out of the sun. If you must be in the sun, use sunscreen (at least SPF 15) and a wide-brimmed hat.
  • Stay in the shade or under awnings as much as possible.
  • Avoid overexertion and strenuous outdoor activities.
  • Wear light, light-colored, loose-fitting clothing that covers as much skin as possible to prevent sunburn.
  • Drink plenty of non-alcoholic, caffeine-free fluids, even if you don’t feel thirsty. Water, diluted juice and electrolyte solutions are best. Stay away from carbonated drinks.
  • Avoid alcohol.
  • If you are on a fluid-restricted diet or take diuretics, consult your doctor before exposing yourself to heat.
  • Keep the lights in your home low or off, keep screens drawn and avoid using the oven.
  • Keep rooms well ventilated with air conditioning and fans. Keep your windows open if you don’t have air conditioning or a fan. Note: Fans do not prevent heat-related illness when temperatures are in the high 90s.
  • Cool down with cool, wet towels and periodic cool baths or showers.
  • Take advantage of cooling centers, public pools, and air-conditioned shops and malls during periods of extreme heat.
  • Exposure to air conditioning for even a few hours a day reduces the risk of heat-related illness.
  • Closely supervise children, the elderly or those who need special care during periods of intense summer heat.
  • Do not leave children or pets in a closed vehicle, even for a few minutes. On a hot day, the temperature in a closed vehicle can reach 140ºF-190ºF within 30 minutes.
  • Make a special effort to check on your neighbors during a heat wave, especially if they are seniors, families with young children, people with special needs, or live alone.
  • Seniors and others who may be sensitive to extreme heat should contact friends, neighbors or relatives at regular intervals throughout the day.
  • Seek help if you feel symptoms of heat-related illnesses.
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