Wentzville Warnings, Watches and Advisories

When a severe thunderstorm warning is issued, the storm may produce damaging winds, large hail, dangerous lightning, and heavy rain. In some cases, heavy rainfall produced by a severe storm can also lead to flash flooding. Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Wentzville.

Use the Radar Maps link provided to understand the trajectory of a storm.

Heat Advisory issued September 2 at 1:18PM CDT until September 5 at 8:00PM CDT by NWS Kansas City/Pleasant Hill MO

* WHAT...Heat index values up to 104. * WHERE...Portions of east central and northeast Kansas and central, north central, northeast, northwest, and west central Missouri. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Extreme Heat Warning issued September 2 at 1:12PM CDT until September 5 at 8:00PM CDT by NWS Paducah KY

* WHAT...Dangerously hot conditions with heat index values 105 to 110. * WHERE...All of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...Until 8 PM CDT /9 PM EDT/ Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Heat Advisory issued September 2 at 12:43PM CDT until September 5 at 8:00PM CDT by NWS Springfield MO

* WHAT...Heat index values of 100 to 105. Minimal overnight relief with temperatures in the middle to upper 70s. * WHERE...Portions of southeast Kansas and central, east central, south central, southwest, and west central Missouri. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Extreme Heat Warning issued September 2 at 10:08AM CDT until September 4 at 7:00PM CDT by NWS Quad Cities IA IL

* WHAT...Dangerously hot conditions with heat index values up to 105. * WHERE...Portions of north central, northwest, and west central Illinois, east central and southeast Iowa, and northeast Missouri. * WHEN...Until 7 PM CDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Heat Advisory issued September 2 at 8:30AM CDT until September 5 at 8:00PM CDT by NWS Memphis TN

* WHAT...Heat index values up to 109 degrees is expected. * WHERE...Portions of East Arkansas, North Mississippi, Southeast Missouri, and West Tennessee. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued September 2 at 2:34AM CDT until September 5 at 8:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 106. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued September 2 at 2:34AM CDT until September 5 at 8:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 109. * WHERE...In Illinois, Madison IL, Monroe IL, and Saint Clair IL Counties. In Missouri, Jefferson MO, Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Air Quality Alert issued September 1 at 2:56PM CDT by NWS St Louis MO

The St. Louis Clean Air Partnership has issued an air quality alert for the St. Louis metropolitan area from 9 AM to 8 PM CDT Wednesday. An Orange air quality forecast means that maximum ozone concentrations are expected to reach levels that pose a health risk. Adverse health effects increase as air quality deteriorates. Ground- level ozone is an air contaminant which can cause breathing difficulties for children, older adults, as well as persons with respiratory problems. Reducing outdoor physical activity is recommended. If it is a regularly scheduled work day you are urged to consider telecommuting, carpooling, or utilizing public transit. Avoid excessive idling and do not top off when refueling motor vehicles. The use of gasoline-powered lawn equipment should be reduced or postponed until late in the day. For more information visit the St. Louis Clean Air Partnership at http://cleanair-stlouis.com/ For current Air Quality Index (AQI) values visit https://www.airnow.gov/

Air Quality Alert issued September 1 at 2:37PM CDT by NWS Kansas City/Pleasant Hill MO

The Mid-America Regional Council has issued a code Orange Air Quality Alert for the Kansas City metropolitan area, with ground level ozone being the primary pollutant until 7 PM CDT this evening. Additionally, a code Orange Air Quality Alert for the Kansas City metropolitan area is in effect Wednesday from 9 AM CDT to 7 PM CDT. Members of sensitive groups may experience health effects. People and businesses are urged to avoid activities which lead to ozone formation. These activities include refueling vehicles or topping off when refueling idling vehicles unnecessarily and using gasoline powered lawn equipment. Positive activities include car pooling, biking to work, delaying or combining errands, and using water-based paints and cleaners. When pollution levels are elevated, the Mid-America Regional Council recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For further information, please see the Mid-America Regional Council air quality program website at http://www.airqkc.org.