Hot, humid weather prompts heat advisory - FOX 10 News |

Hot, humid weather prompts heat advisory

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CHICAGO (Sun-Times Media Wire) -

The warm, humid air blanketing the Chicago area is expected to get hotter over the next two days, prompting authorities to issue a heat warning.

The National Weather Service has issued a heat advisory for northern Illinois and northwest Indiana that will be in effect from 11 a.m. Thursday until 7 p.m. Friday.

The advisory comes after the temperature reached 94 Wednesday after a 91 Tuesday at O'Hare Airport.

The temperature could reach the mid-90s on Thursday and upper 90s Friday, according to the weather service. The heat index is expected to be from 100 to 108 degrees.

"At least a couple times a summer we get this sort of thing," weather service meteorologist Mark Ratzer said.

The temperatures should remain in the 70s at night, but latent heat absorbed by concrete, glass and steel means city-dwellers will not get the same reprieve as those in outlying areas as temperatures could be 5 to 10 degrees hotter in the city at night, Ratzer said.

The heat and humidity could cause heat-related illness, especially in small children, the elderly and people with medical conditions, according to the weather service.

People outside should take extra precautions and reschedule strenuous activities to early morning or late evening, according to the weather service, which also suggests wearing light-weight, loose clothing when possible and drinking plenty of water.

A thunderstorm is likely Friday night as a cool wave passes through, with cooler temperatures expected for the weekend, according to the weather service. The high is only expected to reach 85 on Saturday and 78 on Sunday.

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