Temperatures are climbing into the 90s in many areas, and heat indices will make it feel as if it’s over 100 degrees.
As of 11:15 a.m., the temperature had already hit 93 degrees in Kankakee. Heat indices were up to 104 degrees in Kankakee in Joliet.
Heat indices are expected to top out at 100 to 105 degrees, according to CBS 2’s Mary Kay Kleist.
The heat advisory is in effect until 7 p.m. for Cook, DuPage and Will counties, as well as areas farther south and southwest of the city, and all of Northwest Indiana.
There have been 12 90-degree days in Chicago so far in 2010 – the highest since 2005, according to the weather service. The record was set in 1988, when there were more than 25 90-degree days through up to this point.
The high heat index poses risk of heat exhaustion or heat stroke for people working outdoors or engaging in strenuous activities. The weather service advises drinking plenty of fluids, staying out of the sun and in air conditioned rooms and check on relatives and neighbors.
Meanwhile, the northern suburbs have an added problem – persistent showers on top of torrential rain that flooded some areas overnight.
A flash flood watch is in effect through Saturday morning for Lake and McHenry counties, and flood warnings are in effect for the Fox River and several other rivers in far northern Illinois and southern Wisconsin.
All this is coming on top of damage from a storm system that blew through parts of the area overnight. The northern suburbs were slammed with winds of more than 50 mph. Power lines and trees were ripped down in Zion, and several roads had to be shut down.
Wisconsin had it even worse. Tornadoes touched down in some areas, and flooding Thursday night closed General Mitchell Airport. In Milwaukee, a sinkhole swallowed a Cadillac Escalade, a driver fell into a creek, and two women got struck by lightning.
A new round of severe weather will likely hit Chicago later Friday. The first round of storms will come between 4 and 8 p.m., as the wind draws tropical moisture toward the area ahead of a low-pressure system. The second round will come overnight, as the low pressure center approaches, Kleist said.
The forecast highs won’t be as severe over the weekend as on Friday. The high for Saturday is 88 degrees, the high for Sunday 83.
Read the original report from CBS Chicago.