Stay cool on Thursday! High heat and humidity will make it feel like the upper 90s to the low 100s. This is hot enough to develop heat-related illnesses.

"There is high confidence that heat will reach levels that would affect anyone without sufficient cooling." Over 50 million ...

Extreme heat is blanketing the Chicago area starting Wednesday, with heat index readings expected to be over 100.The National Weather Service has issued a Heat Advisory, which went into effect for the ...