Alton, IL 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 Alton.

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

Flood Advisory issued November 4 at 11:44AM CST until November 4 at 2:45PM CST by NWS St Louis MO

* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...A portion of southwest Illinois, including the following counties, Monroe and Randolph. * WHEN...Until 245 PM CST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Ponding of water in urban or other areas is occurring or is imminent. * ADDITIONAL DETAILS... - At 1144 AM CST, the public reported heavy rain in the advisory area due to thunderstorms. This is causing urban and small stream flooding, particularly in Baldwin where water has covered roadways near Highway 154. Between 3 and 5 inches of rain have fallen. - Additional rainfall amounts of 1 to 2 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Waterloo, Chester, Ste. Genevieve, Sparta, Red Bud, Bremen, Coulterville, Tilden, Evansville, Baldwin, St. Mary, New Design, Eden, Preston, Blair, Prairie Du Rocher, Prairie, Hecker, Ellis Grove and Ruma.

Flood Advisory issued November 4 at 10:30AM CST until November 4 at 4:30PM CST by NWS St Louis MO

* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...A portion of south central Illinois, including the following county, southeastern Washington. * WHEN...Until 430 PM CST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 1030 AM CST, Doppler radar indicated heavy rain due to thunderstorms. This will cause urban and small stream flooding. Between 1 and 3 inches of rain have fallen. - Additional rainfall amounts of 1 to 2 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Nashville, Ashley, Posen, Beaucoup, Richview, Addieville, Oakdale, Radom, Du Bois and Cordes.

Hydrologic Outlook issued November 4 at 4:15AM CST by NWS Chicago IL

ESFLOT An approaching storm system will interact with a record moist and unseasonably warm air mass to bring the threat of locally very heavy rainfall tonight. While there are uncertainties exactly where, there are indications that a swath of 2 to potentially over 4 inches of rain could occur somewhere over northern Illinois tonight. Despite the ongoing drought and resultant low stream flow and below average soil moisture; if rainfall on the higher end of the forecast range were to occur, it would likely result in flash flooding, particularly of low lying and flood prone areas. If rainfall totals on the lower end of the forecast range were to occur, some minor flooding could still occur. Very heavy rainfall and flash flooding are possible, but not yet certain. Persons should closely monitor forecasts including the possibility of flood watches, warnings, and advisories. Clear storm drains and gutters of leaf debris to allow storm waters to drain.