An extreme heat warning will be in effect Monday afternoon through 7 p.m. Thursday for St. Louis County and surrounding areas.

The National Weather Service of St. Louis said that heat index values up to 114 degrees are anticipated.

The counties affected by the warning in Missouri are St. Louis County, St. Louis City, Jefferson and St. Charles. The counties affected by the warning in Illinois are Madison, St. Clair and Monroe, which includes the cities of Edwardsville, Cahokia, Alton and Belleville.

People in the St. Louis metropolitan area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a landline phone dial 211. You can also call Cool Down St. Louis at 314-241-7668.

Heatstroke is an emergency that requires a 911 call.