Decatur, IA 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 Decatur.

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

Heat Advisory issued September 4 at 3:05AM CDT until September 5 at 7:00PM CDT by NWS Des Moines IA

* WHAT...Heat index values up to 105 expected. * WHERE...Boone, Marshall, Story, Tama, Carroll, Crawford, and Greene Counties. * WHEN...From 1 PM this afternoon to 7 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...While heat index values may not reach 105 degrees each day, the combination of the longevity of the heat and little or limited relief during the overnight periods with warm lows have prompted the multi-day Heat Advisory.

Heat Advisory issued September 4 at 3:05AM CDT until September 5 at 7:00PM CDT by NWS Des Moines IA

* WHAT...Heat index values up to 105 expected. * WHERE...Grundy, Hamilton, Hardin, Webster, Black Hawk, Calhoun, and Sac Counties. * WHEN...From 1 PM this afternoon to 7 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...While heat index values may not reach 105 degrees each day, the combination of the longevity of the heat and little or limited relief during the overnight periods with warm lows have prompted the multi-day Heat Advisory.

Heat Advisory issued September 4 at 3:05AM CDT until September 5 at 7:00PM CDT by NWS Des Moines IA

* WHAT...Heat index values up to 105. * WHERE...Portions of central and southern Iowa. * WHEN...Until 7 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...While heat index values may not reach 105 degrees each day, the combination of the longevity of the heat and little or limited relief during the overnight periods with warm lows have prompted the multi-day Heat Advisory.

Heat Advisory issued September 4 at 2:49AM CDT until September 4 at 7:00PM CDT by NWS La Crosse WI

* WHAT...Heat index values up to 102 expected. * WHERE...In Iowa, Clayton and Fayette Counties. In Wisconsin, Grant County. * WHEN...From 1 PM this afternoon to 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued September 4 at 2:37AM CDT until September 4 at 7:00PM CDT by NWS Quad Cities IA IL

* WHAT...Heat index values of 100 to 105. * WHERE...Portions of northwest Illinois and east central and northeast Iowa. * WHEN...Until 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Extreme Heat Warning issued September 4 at 2:37AM CDT until September 5 at 7:00PM CDT by NWS Quad Cities IA IL

* WHAT...Dangerously hot conditions with heat index values of 100 to 110. * WHERE...Portions of northwest and west central Illinois, east central and southeast Iowa, and northeast Missouri. * WHEN...Until 7 PM CDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Heat Advisory issued September 3 at 12:02PM CDT until September 5 at 7:00PM CDT by NWS Omaha/Valley NE

* WHAT...Afternoon heat index values up to 105 expected. Overnight low temperatures between 72 and 78. * WHERE...In Iowa, Harrison and Shelby Counties. In Nebraska, Dodge and Washington Counties. * WHEN...Until 7 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Several days of excessive heat will add to cumulative heat stress. * ADDITIONAL DETAILS...The heat advisory may be extended or expanded as the prolonged heatwave continues.

Heat Advisory issued September 3 at 12:02PM CDT until September 5 at 7:00PM CDT by NWS Omaha/Valley NE

* WHAT...Afternoon heat index values up to 105 expected. Overnight low temperatures between 72 and 78. * WHERE...Portions of southwest Iowa and east central and southeast Nebraska. * WHEN...Until 7 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Several days of excessive heat will add to cumulative heat stress. * ADDITIONAL DETAILS...The heat advisory may be extended or expanded as the prolonged heatwave continues.