Low pressure lifting northward through the Illinois River Valley triggered a line of strong to severe thunderstorms during the afternoon and early evening of October 11th.  With the low in close proximity, ample environmental wind shear led to numerous circulations developing within the line of convection.  Four weak tornadoes touched down as the storms passed, causing minor damage across portions of Morgan and Woodford counties.  In addition, isolated cells ahead of the main line produced wind damage.  In particular, widespread damage was reported across Olney in Richland County, likely due to downburst winds in excess of 70mph.

Thunderstorm Wind in MASON, ILLINOIS
From 11-OCT-21 14:47:00 to 11-OCT-21 14:52:00 (CST-6)
Location: HAVANA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large tree limb was blown down.

Thunderstorm Wind in RICHLAND, ILLINOIS
From 11-OCT-21 14:30:00 to 11-OCT-21 14:35:00 (CST-6)
Location: OLNEY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees and large tree branches were blown down across Olney, including some that fell onto houses and cars.  One falling tree clipped part of the roof and brick facade of an apartment complex on Main Street.

Thunderstorm Wind in MCLEAN, ILLINOIS
From 11-OCT-21 16:52:00 to 11-OCT-21 16:57:00 (CST-6)
Location: ARROWSMITH
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An outbuilding was damaged, with wood and sheet metal strewn downstream.  Corn crops next to the shed and up a nearby road were flattened as well.

Thunderstorm Wind in EDGAR, ILLINOIS
From 11-OCT-21 14:35:00 to 11-OCT-21 14:40:00 (CST-6)
Location: PARIS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Several trees were blown over, causing roof damage.

Hail in MORGAN, ILLINOIS
From 11-OCT-21 14:15:00 to 11-OCT-21 14:20:00 (CST-6)
Location: ARNOLD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WOODFORD, ILLINOIS
From 11-OCT-21 15:45:00 to 11-OCT-21 15:50:00 (CST-6)
Location: LOW PT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 10-inch diameter tree branch was blown down and an old barn was damaged.

Tornado in MORGAN, ILLINOIS
From 11-OCT-21 14:26:00 to 11-OCT-21 14:28:00 (CST-6)
Location: ALEXANDER
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down in an open field 0.5 miles northwest of Alexander at 3:26 PM CDT.  The tornado tracked northeastward damaging several large trees before crossing I-72 near mile marker 76, where it blew over a semi truck.  It continued northeastward damaging additional large trees before dissipating about 2 miles northwest of Alexander near Highway 123 at 3:28 PM CDT.

Tornado in WOODFORD, ILLINOIS
From 11-OCT-21 15:28:00 to 11-OCT-21 15:30:00 (CST-6)
Location: ROANOKE
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down in an open field about 3 miles north of Roanoke at 4:28 PM CDT.  It tracked northeastward for about 0.3 miles before quickly dissipating at 4:30 PM CDT.  No damage was observed.

Tornado in WOODFORD, ILLINOIS
From 11-OCT-21 15:45:00 to 11-OCT-21 15:51:00 (CST-6)
Location: WASHBURN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down about 3.4 miles east-southeast of Washburn along County Highway 2100 North at 4:45 PM CDT.  The tornado damaged the roof and walls of a barn and a couple large trees, throwing the debris into a corn field to the northeast.  It continued tracking through fields before damaging an outbuilding along County Highway 2300 North.  The tornado dissipated 3.5 miles east of Washburn at 4:51 PM CDT.

Tornado in WOODFORD, ILLINOIS
From 11-OCT-21 16:39:00 to 11-OCT-21 16:44:00 (CST-6)
Location: EL PASO
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down in an open field about 2 miles southwest of El Paso at 5:39 PM CDT.  The tornado tracked northward across Highway 24 just west of El Paso before dissipating in a field 1.5 miles west-northwest of El Paso at 5:44 PM CDT.  No damage was observed.