Chicago is on pace to break the record for the most 90-degree days. What is causing the prolonged heat wave, and is this a sign for what's to come in future summers? A meteorologist from the National Weather Service joins us on Chicago Tonight at 7:00 pm.

View a graphic of the U.S. Drought Monitor's Midwest region below. Click image for larger version.

Related Links:

National Weather Service

Record Pace of 90 Degree Days in Chicago This Summer

National Weather Service: Heat: A Major Killer

Chicago Forecast at National Weather Service

U.S. Drought Monitor: Midwest

City of Chicago: Emergency Management & Communications

City Cooling Centers

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