Weather

105-Degree Heat Index, Daily Storm Chances Return To Illinois

"Heat indices may 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 peak heat index values above 105 degrees are expected on Sunday and Monday, according to the National Weather Service.

With the hot temperatures, daily thunderstorm chances are also set 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.

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

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

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"Heat indices may approach or exceed 100 degrees Sunday through Tuesday," the weather service said.

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

Storms are possible both Sunday night and Monday night.

Staying safe in the heat

The Illinois Emergency Management Agency offers a list of cooling centers for those who do not have air conditioning.

From IEMA:

  • Know the 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, wear 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 lightweight, light-colored, loose-fitting clothes that cover as much skin as possible to prevent sunburn.
  • Consume plenty of non-alcoholic, non-caffeinated fluids, even if you don't feel thirsty. Water, diluted juices, and electrolyte solutions are best. Stay away from carbonated drinks.
  • Avoid alcohol.
  • If you are on a fluid-restricted diet or taking diuretics, consult your doctor before exposing yourself to heat.
  • Keep lights in your home low or off, keep shades drawn, and avoid using the oven.
  • Keep rooms well ventilated with air conditioners and fans. Keep your windows open if you don't have air conditioning or a fan.Note: Fans will not prevent heat-related illness when the temperature is 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 stores and malls during periods of extreme heat.
  • Exposure to air conditioning for even a few hours a day will reduce the risk for heat-related illness.
  • Closely monitor children, the elderly, or those who require 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, temperatures inside 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 living alone.
  • Seniors and others who may be sensitive to extreme heat should contact friends, neighbors, or relatives periodically throughout the day.
  • Seek help if you feel symptoms of heat-related illnesses.

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