Numerous severe thunderstorms formed ahead of an approaching cold front across southeast Missouri during the evening hours of Sunday, October 24th, 2021. As the storms moved northeastward, they moved into a moist, energy-rich environment with substantial wind shear in the low and mid-levels. They quickly intensified, remaining somewhat isolated as they moved through southeast Missouri and into southwest Illinois. The environment was very favorable for tornadic development, and these storms produced several tornadoes and wind damage as they moved through the area. Two storms produced tornadoes that remained on the ground for significant distances. The  tornado that moved through Fredericktown, MO, passing through Madison County into Perry County, was on the ground for 18.9 miles. Another tornado moved from St. Francois County through St. Genevieve County in Missouri into Randolph County in Illinois, staying on the ground for over 40 miles.

Tornado in WASHINGTON, ILLINOIS
From 24-OCT-21 20:54:00 to 24-OCT-21 20:55:00 (CST-6)
Location: RICHVIEW
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado touched down just north of I-64 causing primarily tree damage, but one home was damaged on Chestnut Road. The tornado traveled northeast, again primarily causing tree damage and crossed Tower Road. Damage occurred to two machine sheds just west of U.S. Highway 51 and south of Holly Road with the tornado lifting shortly thereafter. Overall, the tornado was rated EF0 with a path length of 2.05 miles and a max path width of 180 yards. No deaths or injuries were reported.

Thunderstorm Wind in PIKE, ILLINOIS
From 24-OCT-21 16:23:00 to 24-OCT-21 16:39:00 (CST-6)
Location: PIKE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down numerous tree limbs near Pike along U.S. Highway 54. In Griggsville, several power lines were blown down.

Thunderstorm Wind in MARION, ILLINOIS
From 24-OCT-21 20:59:00 to 24-OCT-21 20:59:00 (CST-6)
Location: CENTRALIA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down several large tree limbs on the south side of town.

Flash Flood in ADAMS, ILLINOIS
From 24-OCT-21 16:45:00 to 24-OCT-21 18:45:00 (CST-6)
Location: KELLERVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to four inches of rain fell in a short amount of time causing flash flooding. Several roads were washed out in the Clayton and Concord townships, including N 1353rd Lane near Walnut Fork Creek.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 24-OCT-21 20:37:00 to 24-OCT-21 20:50:00 (CST-6)
Location: SWANSEA
Magnitude: 54.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A swath of damaging winds occurred over St. Clair County from Swansea through O'Fallon, Scott AFB, and Mascoutah. Several large trees were blown down. The roof of a storage building was blown off at Air Force Base Storage. The debris landed on a house east of the storage building near the intersection of Illinois Route 161 and Hannah Chase Court. In Mascoutah, a pole barn was lifted and flipped, landing on a nearby business about 30 feet to the east.

Thunderstorm Wind in WASHINGTON, ILLINOIS
From 24-OCT-21 20:25:00 to 24-OCT-21 20:25:00 (CST-6)
Location: NEW MINDEN
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Downburst winds blew a vehicle off of the roadway in New Minden. No injuries were reported. Also, several large tree limbs were blown down in the area.

Thunderstorm Wind in CLINTON, ILLINOIS
From 24-OCT-21 21:05:00 to 24-OCT-21 21:05:00 (CST-6)
Location: AVISTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated a wind gust of 65 mph in Aviston.

Tornado in RANDOLPH, ILLINOIS
From 24-OCT-21 20:06:00 to 24-OCT-21 20:28:00 (CST-6)
Location: PUJOL
Tornado F-scale: EF2
Property damage: 3.04M
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado moved out of Missouri (Ste. Genevieve County) into Illinois (Randolph County) moving though flood plains and crossing the Mississippi River just north of the Menard Correctional Center.  The tornado crossed Route 3 south of Lochhead Drive destroying a small barn, snapping or uprooting trees, and caused minor damage to several homes and a hardware store. Snapped or uprooted trees and downed power poles were found along the remainder of the tornado track through Chester with roof damage to several homes on Brenda Street. The worst damage in Chester occurred just northeast of the Palestine Road and Three Spring Roads intersection, where two farm outbuildings were completely destroyed. The larger of the two buildings was well-built with anchor bolts every 18-24 inches in the concrete foundation. This damage was rated EF-2. Further northeast, minor roof damage and the loss of the roof-mounted HVAC unit was found at the nursing home near Old Lodge Lane and Three Springs Road. The tornado continued to the northeast into Bremen paralleling and crossing Route 150, producing tree damage and minor roof damage to several homes. Minor roof damage to several homes, damage to several farm outbuildings, and snapped and uprooted trees were found along parts of Chester Road and Paradise Road. The worst of this damage was rated EF-1. The tornado dissipated around 1.6 miles northeast of Bremen, just west of Route 150. Overall the tornado was rated EF2 with a path length of 16.47 miles and a max path width of 400 yards.