A stalled surface boundary extending from near Kansas City through central Illinois provided a focus for organized convection during the afternoon. Thunderstorms were mainly hail producers, with up to 1.75 inch diameter hailstones reported in the St. Louis metropolitan area.

Hail in MONTGOMERY, MISSOURI
From 26-SEP-23 17:50:00 to 26-SEP-23 18:30:00 (CST-6)
Location: ORTIZ
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

First responders in Rhineland reported quarter sized hail covering the ground as a thunderstorm split and intensified over the area.

Hail in FRANKLIN, MISSOURI
From 26-SEP-23 19:55:00 to 26-SEP-23 20:15:00 (CST-6)
Location: WASHINGTON MEM ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A discrete thunderstorm produced sub-severe hail in Warren County before crossing the border into Franklin County and dropping quarter sized hail between Washington and Pacific.

Hail in JEFFERSON, MISSOURI
From 26-SEP-23 15:05:00 to 26-SEP-23 15:50:00 (CST-6)
Location: DITTMER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A discrete supercell produced pea to quarter sized hail as it weakened over Jefferson County.

Hail in ST. LOUIS, MISSOURI
From 26-SEP-23 16:22:00 to 26-SEP-23 17:10:00 (CST-6)
Location: FERN GLEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A discrete thunderstorm produced mainly half inch to nickel sized hailstones in southern St. Louis County according to emergency managers, trained spotters, and the public. There was one public report of one inch hail supported by a photo of the hailstone.

Hail in WARREN, MISSOURI
From 26-SEP-23 19:15:00 to 26-SEP-23 19:40:00 (CST-6)
Location: WARRENTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An intensifying discrete thunderstorm produced quarter sized hail along I-70 in Warren County. This storm went on to produce up to golf ball sized hail just after crossing the border into St. Charles County.

Thunderstorm Wind in JEFFERSON, MISSOURI
From 26-SEP-23 20:25:00 to 26-SEP-23 21:05:00 (CST-6)
Location: CEDAR HILL
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The discrete thunderstorm that produced severe hail in Franklin County produced wind damage in Jefferson County. A trained spotter reported a snapped power pole in Cedar Hill.

Hail in ST. CHARLES, MISSOURI
From 26-SEP-23 19:30:00 to 26-SEP-23 20:00:00 (CST-6)
Location: FORISTELL
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The thunderstorm that produced quarter sized hail in Warren County intensified quickly as it entered St. Charles County. There were numerous reports of severe hail in and around Wentzville, ranging from quarters to golf balls. Hailstones damaged windows and siding in multiple neighborhoods in Wentzville before weakening after passing the city.

Heavy Rain in ST. LOUIS, MISSOURI
From 26-SEP-23 15:45:00 to 27-SEP-23 04:30:00 (CST-6)
Location: KINLOCH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported storm total rainfall of 2.07 inches just southwest of Ferguson, with 1.78 of that total falling between midnight and 0530CDT.