Saint Peters, MO Warnings, Watches and Advisories

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 Saint Peters.

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

Heat Advisory issued June 20 at 2:03AM CDT until June 24 at 9:00PM CDT by NWS St Louis MO

* WHAT...Prolonged heat index values exceeding 100 degrees are expected. * WHERE...Portions of south central, southwest, and west central Illinois and east central, northeast, and southeast Missouri. * WHEN...From noon Saturday to 9 PM CDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Extreme Heat Watch issued June 20 at 2:03AM CDT until June 24 at 9:00PM CDT by NWS St Louis MO

* WHAT...Dangerously hot conditions with heat index values up to 109 possible. * WHERE...In Illinois, Jersey IL, 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...From Saturday afternoon through Tuesday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Heat Advisory issued June 20 at 2:03AM CDT until June 24 at 9:00PM CDT by NWS St Louis MO

* WHAT...Heat index values exceeding 100 degrees are expected. * WHERE...Audrain MO, Boone MO, Callaway MO, Cole MO, Moniteau MO, Osage MO, Knox MO, Monroe MO, and Shelby MO Counties. * WHEN...From noon today to 9 PM CDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued June 20 at 1:51AM CDT until June 24 at 7:00PM CDT by NWS Paducah KY

* WHAT...Heat index values between 100 to 108 expected. * WHERE...Portions of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...From noon CDT /1 PM EDT/ Saturday to 7 PM CDT /8 PM EDT/ Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...The first prolonged stretch of heat and humidity of the season will cause heat impacts to be greater than normal.

Flood Warning issued June 19 at 8:28PM CDT until June 21 at 5:54PM CDT by NWS Springfield MO

...The Flood Warning continues for the following rivers in Missouri... Marmaton River near Nevada affecting Vernon County. For the Marmaton River...including Nevada...Minor flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Marmaton River near Nevada. * WHEN...Until Saturday afternoon. * IMPACTS...At 22.0 feet, flood waters impact the county road west of Nevada at the gage site. * ADDITIONAL DETAILS... - At 7:45 PM CDT Thursday the stage was 22.2 feet. - Bankfull stage is 20.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 7:45 PM CDT Thursday was 22.2 feet. - Forecast...The river is expected to fall below flood stage tomorrow afternoon and continue falling to 6.6 feet Tuesday evening. - Flood stage is 20.0 feet. - Flood History...This crest compares to a previous crest of 22.2 feet on 04/28/2013. - http://www.weather.gov/safety/flood

Extreme Heat Watch issued June 19 at 8:16PM CDT until June 22 at 9:00PM CDT by NWS Quad Cities IA IL

* WHAT...Dangerously hot conditions with peak afternoon heat indices near 105 degrees possible, potentially lasting into early next week. * WHERE...Portions of northwest Illinois, east central, northeast, and southeast Iowa, and northeast Missouri. * WHEN...From Saturday afternoon through Sunday evening. * IMPACTS...Heat related illnesses increase significantly during periods of extreme heat and high humidity. * ADDITIONAL DETAILS...There is forecast to be little reprieve overnight with low temperatures in the mid to upper 70s.

Heat Advisory issued June 19 at 1:41PM CDT until June 21 at 7:00PM CDT by NWS Kansas City/Pleasant Hill MO

* WHAT...Heat index values of 100 to 106 expected on Friday and Saturday. * WHERE...Portions of east central and northeast Kansas and central, north central, northeast, northwest, and west central Missouri. * WHEN...From 1 PM Friday to 7 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Low temperatures overnight on Friday into Saturday will have little relief with expected minimum temperatures of mid to upper 70s.