St. Louis will see another heat advisory today and Thursday as heat indexes reach dangerous levels. 

The National Weather Service issued a heat advisory earlier this week as temperatures began rising Tuesday, and are expected to reach between 100 and 108 degrees Wednesday and Thursday. The advisory lasts through 9 p.m. Thursday, July 29.

The affected areas include Jefferson County, St. Charles County, St. Louis County and St. Louis city, as well Madison, Monroe and St. Clair Counties in Illinois.

High temperatures combined with high humidity can cause heat-related illnesses. The NWS suggests citizens wear light clothing, drink plenty of fluids, avoid strenuous activities, stay out of the sun, check up on neighbors and relatives and never leave children or pets in bars.

People in the St. Louis region can get information about cooling centers or other assistance related to the excessive heat by calling United Way of Great St. Louis at 800-827-4626 or calling Cool Down Saint Louis at 314-241-7668.