(KMOV.com) -- The St. Louis area is under an excessive heat warning and the high temperatures are expected to linger throughout next week with no relief in sight.
Saturday was the first day of the heat wave, but it is expected to get much worse. Temperatures and humidity levels will increase over the next few days. Four days this week are forecast to be 100 degrees or hotter. Peak heat index values will be between 105 and 115 degrees.
Because of the extreme heat, the National Weather Service issued an excessive heat warning areawide. It started on Saturday and is in effect through Saturday at 7 p.m.
The length of this heat wave will pose a serious threat to at risk groups like the very young, elderly and those with chronic health conditions. Reschedule strenuous activities to the early morning or evening hours. Drink plenty of water and be sure to wear light-colored, loose fitting clothing. Never, under any circumstances, leave children or pets in a vehicle, even if the vehicle is running.
If you have to be outside, take frequent breaks in the shade or air conditioning. If you do not have air conditioning, you are encouraged to take advantage of a local cooling center.