A very strong cold front moved south through the region. A line of strong to severe storms developed ahead of the cold front. Some of the storms produced widespread wind damage.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 10-AUG-20 16:36:00 to 10-AUG-20 16:45:00 (CST-6)
Location: GILMORE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Widespread wind damage occurred across St. Charles County. In O'Fallon, St. Charles, St. Peters and Havester, numerous large tree limbs were blown down.  A tree was blown over onto Highway DD near Sommers Road.  In St. Charles, one of the large tree limbs fell onto a garage causing minor roof damage. In St. Peters, a tree was blown onto a house causing moderate damage.

Thunderstorm Wind in ST. LOUIS (C), MISSOURI
From 10-AUG-20 16:55:00 to 10-AUG-20 17:10:00 (CST-6)
Location: TOWER GROVE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds blew down up to 40 large trees, numerous tree limbs and power lines across portions of the city.  A power pole was blown down in the 3800 block of Shaw Boulevard. Several unoccupied vehicles sustained damage from fallen trees and tree limbs.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 10-AUG-20 16:45:00 to 10-AUG-20 17:10:00 (CST-6)
Location: BRIDGETON TERRACE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Widespread wind damage occurred across St. Louis County, especially across the central portions between Maryland Heights and Oakville.  Numerous trees, tree limbs and power lines were blown down. In Maryland Heights, a large tree was blown down onto power lines near the intersection of Ameling Road and Bennington Place. Several unoccupied vehicles sustained damage from fallen trees and tree limbs. On vehicle was destroyed by a fallen tree in Rock Hill.

Flash Flood in BOONE, MISSOURI
From 10-AUG-20 14:45:00 to 10-AUG-20 20:00:00 (CST-6)
Location: ROCHEPORT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to three inches of rain fell in a short amount of time causing flash flooding. Numerous roads were flooded. About a foot and a half of water was over Paris Road near Brown Station Road.

Thunderstorm Wind in BOONE, MISSOURI
From 10-AUG-20 15:33:00 to 10-AUG-20 15:40:00 (CST-6)
Location: HINTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds uprooted several trees that were in very wet soil.

Thunderstorm Wind in MONTGOMERY, MISSOURI
From 10-AUG-20 15:45:00 to 10-AUG-20 15:45:00 (CST-6)
Location: BELLFLOWER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down several tree limbs around town.

Thunderstorm Wind in CALLAWAY, MISSOURI
From 10-AUG-20 15:36:00 to 10-AUG-20 15:36:00 (CST-6)
Location: (JEF)JFFRSN CITY MEM
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in LINCOLN, MISSOURI
From 10-AUG-20 16:00:00 to 10-AUG-20 16:12:00 (CST-6)
Location: TROY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew down two large highway signs along U.S. Highway 61 near interchange with Highway 47. Also, about 3 miles east northeast of Troy, large tree limbs were blown down and part of a tin roof of a east-west facing gable barn was torn off. In Foley, several large trees were uprooted.

Thunderstorm Wind in FRANKLIN, MISSOURI
From 10-AUG-20 16:15:00 to 10-AUG-20 16:15:00 (CST-6)
Location: NEIER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorm winds blew down a large tree onto Highway WW about 3 miles west of St. Clair.

Thunderstorm Wind in FRANKLIN, MISSOURI
From 10-AUG-20 16:20:00 to 10-AUG-20 16:20:00 (CST-6)
Location: SULLIVAN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down numerous large tree limbs.

Thunderstorm Wind in FRANKLIN, MISSOURI
From 10-AUG-20 16:50:00 to 10-AUG-20 16:50:00 (CST-6)
Location: SULLIVAN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down several power poles along the service road.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 10-AUG-20 16:37:00 to 10-AUG-20 16:37:00 (CST-6)
Location: (SUS)SPIRIT/ST LOUIS
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in MONITEAU, MISSOURI
From 10-AUG-20 15:40:00 to 10-AUG-20 15:40:00 (CST-6)
Location: CALIFORNIA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds blew down several large tree limbs and a short light pole.

Thunderstorm Wind in ST. FRANCOIS, MISSOURI
From 10-AUG-20 18:00:00 to 10-AUG-20 18:00:00 (CST-6)
Location: ST FRANCOIS
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lightning in ST. LOUIS, MISSOURI
From 10-AUG-20 17:10:00 to 10-AUG-20 17:10:00 (CST-6)
Location: CLIFF CAVE
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning struck a house near the intersection of Christopher Drive and Schnell Drive, causing a house fire.  The fire began in the garage and a car parked in the garage was destroyed as well. Two people were in the home, but escaped unharmed.

Thunderstorm Wind in JEFFERSON, MISSOURI
From 10-AUG-20 17:04:00 to 10-AUG-20 17:14:00 (CST-6)
Location: ARNOLD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A line of severe storms moved across Jefferson County. Numerous trees, tree limbs and power lines were blown down.  In Pevely, a 51 year old woman was killed when a tree was uprooted by the thunderstorm winds and it fell on her. She had been helping her boyfriend move a hard top from a Jeep to prevent damage to it from the approaching severe storms.  The boyfriend was not injured by the fallen tree.  In Arnold, a large maple tree was blown over onto a house. The house suffered damage to the awning and gutters before rolling off the slanted roof.  Just southwest of Festus a tree was blown down onto Route CC. Several unoccupied vehicles sustained damage from fallen trees and tree limbs.