Excessive Heat Watch until 10:00PM Saturday 
...EXCESSIVE HEAT WATCH NOW IN EFFECT FROM THURSDAY MORNING THROUGH SATURDAY EVENING...
* TIMING...An extended period of heat will begin to develop on Wednesday and likely peak on Thursday, Friday, and Saturday. The most intense and dangerous heat is expected from the late morning into the early evening on Thursday, Friday, and Saturday. Although Sunday may be a little cooler, heat index values in excess of 100 degrees will likely continue.
* HEAT INDEX VALUES...Up to 110 due to temperatures in the upper 90s, and dewpoints in the mid 70s.
* IMPACTS...The likely combination of hot temperatures and high humidity will lead to an increased risk of heat-related stress and illness. The very young, the elderly, those without air conditioning, and those participating in strenuous outdoor activities will be the most susceptible. Also, car interiors can reach lethal temperatures in a matter of minutes.
* AFFECTED AREAS: JEFFERSON ... LINCOLN ... ST. CHARLES ... ST. LOUIS ... ST. LOUIS CITY ... STE. GENEVIEVE
Instructions:
An Excessive Heat Watch is advanced notice that there is the potential for a prolonged period of hot temperatures and high humidity. This will create a dangerous situation in which heat- related illnesses are possible. Begin making preparations now, by making sure your air conditioning is in good working order or know where to go to stay cool.
Address/Location
St Louis County MO Office of Emergency Management
1150 Hanna Rd
Ballwin, MO 63021
Contact
Emergency: 9-1-1