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Public Information Statement
National Weather Service Saint Louis MO
532 PM CST Sat Dec 11 2021

...NWS Damage Survey for 12/10/2021 Tornado Event...

A team of meteorologists surveyed two tornadoes across east central 
Missouri from thunderstorms that occurred during the evening of 
December 10th.

.Wellsville Tornado...

Rating:                 EF-0
Estimated Peak Wind:    80 mph
Path Length /statute/:  1 mile
Path Width /maximum/:   50 yards
Fatalities:             0
Injuries:               0

Start Date:             12/10/2021
Start Time:             6:59 PM CST
Start Location:         2NE Wellsville, MO
Start Lat/Lon:          39.0930/-91.5390

End Date:               12/10/2021
End Time:               7:00 PM CST
End Location:           3NE Wellsville, MO
End Lat/Lon:            39.1041/-91.5195

A weak tornado touched down between Wellsville and Middletown near
the intersection of Morgan School Road and Route A, and traveled 
northeast to Orchard Road. Minor tree damage and flattened corn was 
observed. The width of the tornado was around 50 yards, and the damage
was rated at an EF-0. Interestingly, the WSR-88D identified debris 
(lowering correlation coefficient), likely from the lofted corn stalks.


.Defiance Tornado...

Rating:                 EF-3
Estimated Peak Wind:    165 mph
Path Length /statute/:  21 miles
Path Width /maximum/:   100 yards
Fatalities:             1
Injuries:               2

Start Date:             12/10/2021
Start Time:             7:35 PM CST
Start Location:         2NW Augusta, MO
Start Lat/Lon:          38.5982/-90.9085

End Date:               12/10/2021
End Time:               7:57 PM CST
End Location:           2SE Harvester, MO
End Lat/Lon:            38.7196/-90.5556

The tornado developed one mile north of the intersection of 
Highway T and Highway 94 in southwestern St. Charles County around 
7:35 PM CDT. Two houses had minor damage and one outbuilding was
destroyed. The tornado continued northeast and strengthened as it 
approached Highway F, northwest of Defiance. Multiple homesteads 
and farms suffered varying degrees of property damage along 
Highway F to Highway 94.

Two homes were completely destroyed. The first home was 110 years
old and did not appear to have any anchoring to the concrete foundation. 
The second home just 100 yards east of the first was swept clean 
to the subfloor, which was still anchored to the concrete foundation. 
One fatality and two injuries occurred at this location. The damage
was rated EF3 with winds to 165 mph.

The tornado continued northeast, crossing the Missouri River and 
Howell Island before entering St. Louis County in Chesterfield Valley. 
The tornado caused extensive tree damage along the river, a mere half 
mile from a large outlet mall. It crossed Highway 40/61/Interstate 64 
east of the Boone Bridge causing minor damage to vehicles that were 
on the highway. The tornado continued northeast, crossing the Missouri 
River again, back into St. Charles County near Greens Bottom Road. Here
additional tree damage, broken power poles, and structural damage was noted. 
The tornado lifted before reaching the Missouri River a second time, just south of 
Harvester at 7:57 PM.

&&

EF Scale: The Enhanced Fujita Scale classifies tornadoes into the
following categories:

EF0...Weak......65 to 85 mph
EF1...Weak......86 to 110 mph
EF2...Strong....111 to 135 mph
EF3...Strong....136 to 165 mph
EF4...Violent...166 to 200 mph
EF5...Violent...>200 mph

NOTE:
The information in this statement is preliminary and subject to
change pending final review of the events and publication in NWS
Storm Data.

$$

MRM/CVKING