A cold front moved through the region triggering showers and storms. A few of the storms produced damaging winds.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LSX wrote it up.
A cold front moved through the region triggering showers and storms. A few of the storms produced damaging winds. One person was killed and another injured when a dead tree was blown over onto a moving car three miles west of Glover in Iron County Missouri.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS St. Louis, MO wrote its last area forecast discussion before the first event at Sep 14, 1:51 PM CST, 2 hours 16 minutes earlier.
Area Forecast Discussion National Weather Service Saint Louis MO 251 PM CDT Tue Sep 14 2021 .SHORT TERM... (Through Late Wednesday Night) Issued at 210 PM CDT Tue Sep 14 2021 A cold front extending from MI southwest through west central IL, near UIN to west central MO, just south of MCI will move southeastward through our forecast area late this afternoon and tonight. Isolated showers have already begun to develop ahead of this front, mainly across southeast MO and southwest IL as the atmosphere has become quite unstable with daytime heating. Coverage of showers and storms will increase late this afternoon into the evening as upper level divergence strengthens ahead of shortwaves moving through the broad upper level trough centered over the Northern Plains. The latest CAMs depict the greatest coverage of convection late this afternoon and evening across east central and southeast MO and southwest IL. Little if any showers/storms are expected across northeast MO and west central IL. Although the better low-mid level wind shear should exist further north behind the cold front, there may still be just enough shear along with instability along and ahead of the front for a few strong to severe storms capable of producing damaging wind gusts and at least small hail late this afternoon and this evening. The cold front should make it down to southern portions of MO and IL by 12Z Wednesday with just a few lingering showers/storms across southeast MO into southwest IL mainly during the morning hours. Most of the CAMs shift the convection south of our forecast area by late morning. Cold air advection behind the cold front will result in cooler and less humid conditions Wednesday and Wednesday night with temperatures close to seasonal normals for mid September. GKS .LONG TERM... (Thursday through Next Tuesday) Issued at 210 PM CDT Tue Sep 14 2021 Dry conditions are expected for Thursday and Thursday night, then there will be a slight chance of showers and storms, mainly during the afternoon and early evening on Friday and Saturday across southeast MO and southwest IL as better low level moisture and instability return to this area ahead of a slow moving upper level low cutoff from the westerlies well north of this area. Above normal temperatures will be returning to our area, particularly by the weekend with southerly surface winds, and as an upper level ridge tries to build northward into MO and IL. This upper level ridge should eventually shift east of our area by Monday and Tuesday with a return to at least widely scattered diurnal showers/storms mainly in southeast MO and southwest IL. GKS && .AVIATION... (For the 18z TAFs through 18z Wednesday Afternoon) Issued at 1136 AM CDT Tue Sep 14 2021 A cold front extending from the Great Lakes region southwest into northern MO, near UIN will move southeastward through the taf sites this afternoon and evening. Diurnal cumulus clouds have developed along and just ahead of this front, around 3000-3500 feet in height. The cumulus clouds will continue to develop this afternoon with daytime heating and instability, and gradually rise in height. Scattered showers and storms will develop along this front late this afternoon into the evening and may impact all the taf sites, except for UIN. Most of the convection should shift south of the taf sites by late evening. It will be VFR outside of the showers/storms with a gradual clearing sky from north to south tonight as surface high pressure builds southward into the area behind the cold front. The southwest wind will become north-northwesterly this afternoon and early this evening after fropa. SPECIFICS FOR KSTL: A cold front extending from the Great Lakes region southwest into northern MO, near UIN will move southeastward through the STL area around 21Z late this afternoon. Diurnal cumulus clouds have developed along and just ahead of this front, around 3000-3500 feet in height. The cumulus clouds will continue to develop this afternoon with daytime heating and instability, and gradually rise in height. Scattered showers and storms will develop along this front late this afternoon into the evening and may impact STL between 22-04Z. Most of the convection should shift south of the STL area late this evening. It will be VFR outside of the showers/storms with a gradual clearing sky from north to south late tonight as surface high pressure builds southward into the area behind the cold front. The southwest wind will become north-northwesterly early this evening after fropa. GKS && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && WFO LSX
Hazardous Weather Outlook National Weather Service Saint Louis MO 321 PM CDT Tue Sep 14 2021 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-152030- Adams IL-Audrain MO-Bond IL-Boone MO-Brown IL-Calhoun IL-Callaway MO- Clinton IL-Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO- Greene IL-Iron MO-Jefferson MO-Jersey IL-Knox MO-Lewis MO-Lincoln MO- Macoupin IL-Madison IL-Madison MO-Marion IL-Marion MO-Moniteau MO- Monroe IL-Monroe MO-Montgomery IL-Montgomery MO-Osage MO-Pike IL- Pike MO-Ralls MO-Randolph IL-Reynolds MO-Saint Charles MO- Saint Clair-Saint Francois MO-Saint Louis City MO-Saint Louis MO- Sainte Genevieve MO-Shelby MO-Warren MO-Washington IL-Washington MO- 321 PM CDT Tue Sep 14 2021 This Hazardous Weather Outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Tonight. Scattered thunderstorms are expected. Isolated severe storms are possible late this afternoon and this evening with damaging winds the primary threat. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. There is a slight chance of thunderstorms on Wednesday across southeast Missouri and southwest Illinois. There is also a slight chance of thunderstorms Friday through Monday across southeast Missouri and southwest Illinois, mainly during the afternoon hours. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed late this afternoon and this evening. Spotters are encouraged to report any severe weather, if observed, to the National Weather Service. GKS
The St Louis radar (KLSX), 30 km away, was scanning. The volume nearest the first event began at 22:07 UTC.
3 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew down numerous large tree limbs.
Thunderstorm winds blew down several large tree limbs.
A dead tree fell onto a vehicle that was traveling southbound on Highway 21, injuring the driver and killing the passenger. A witness trailing the vehicle reported there was only light wind and rain, as did a Missouri State Trooper. The vehicle was destroyed.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Thunderstorm Wind, Iron | 2021-09-14 | 64 | Male | Vehicle/Towed Trailer | Direct |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2021Every state in 2021This day in weather historyWarnings in Missouri, September 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 984526, 984527, 984528.