A strong weather system moving through the region triggered showers and thunderstorms.  A few of the storms caused wind damage, isolated flash flooding and some lightning strikes to buildings and other structures.

Thunderstorm Wind in COLE, MISSOURI
From 20-AUG-10 18:05:00 to 20-AUG-10 18:05:00 (CST-6)
Location: JEFFERSON CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several power lines were blown down on the west side of town.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 20-AUG-10 11:13:00 to 20-AUG-10 11:13:00 (CST-6)
Location: GUMBO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds blew down several large tree limbs near the intersection of Long Road and Chesterfield Airport Road.

Hail in SHELBY, MISSOURI
From 20-AUG-10 14:35:00 to 20-AUG-10 14:35:00 (CST-6)
Location: CLARENCE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning in CALLAWAY, MISSOURI
From 20-AUG-10 17:38:00 to 20-AUG-10 17:38:00 (CST-6)
Location: FULTON
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A church was struck by lightning damaging the steeple and causing electrical damage.

Lightning in ST. CHARLES, MISSOURI
From 20-AUG-10 11:10:00 to 20-AUG-10 11:10:00 (CST-6)
Location: WELDON
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

A lightning strike knocked the National Weather Service radar out for about 24 hours until it could be repaired.

Thunderstorm Wind in CALLAWAY, MISSOURI
From 20-AUG-10 14:20:00 to 20-AUG-10 14:25:00 (CST-6)
Location: HAMS PRAIRIE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down several trees at the intersection of State Road AD and County Road 419.  Also, several trees were blown down on the William Woods University campus.

Thunderstorm Wind in AUDRAIN, MISSOURI
From 20-AUG-10 14:50:00 to 20-AUG-10 14:50:00 (CST-6)
Location: MEXICO MEM ARPT
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in BOONE, MISSOURI
From 20-AUG-10 16:32:00 to 20-AUG-10 16:35:00 (CST-6)
Location: CENTRALIA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew over numerous tree limbs in Centralia and several trees along Route Z in eastern Boone county.  Some of these trees knocked down power lines as well.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 20-AUG-10 11:10:00 to 20-AUG-10 11:10:00 (CST-6)
Location: HARVESTER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A small maple tree was blown down in the Park Charles subdivision.

Thunderstorm Wind in AUDRAIN, MISSOURI
From 20-AUG-10 14:50:00 to 20-AUG-10 14:58:00 (CST-6)
Location: MEXICO
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds caused a lot of tree limb and power line damage in Mexico.  Also, a barn was destroyed on County Road 408 near the intersection with County Road 433.  Several trees were blown down along U.S. Highway 54 on the east side of Mexico. Another barn in the area lost part of its roof.

Thunderstorm Wind in WARREN, MISSOURI
From 20-AUG-10 18:50:00 to 20-AUG-10 18:50:00 (CST-6)
Location: PENDLETON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large tree limbs were blown down onto Highway EE.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 20-AUG-10 19:40:00 to 20-AUG-10 19:40:00 (CST-6)
Location: GILMORE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds blew out a few windows in the Camden Cedar Lakes Apartments complex in Lake St. Louis.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 20-AUG-10 19:50:00 to 20-AUG-10 19:50:00 (CST-6)
Location: O FALLON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew down several power lines in O'Fallon.

Flash Flood in BOONE, MISSOURI
From 20-AUG-10 19:30:00 to 21-AUG-10 01:00:00 (CST-6)
Location: HINTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Between 2 and 4 inches of rain fell in a short amount of time causing flash flooding.  Several roads around Columbia were closed due to flooding.  A water rescue had to be performed on Vandiver Drive on the north side of town due to a vehicle being driven into the flooded roadway and becoming stranded.  No injuries were reported.

Thunderstorm Wind in CALLAWAY, MISSOURI
From 20-AUG-10 17:38:00 to 20-AUG-10 17:38:00 (CST-6)
Location: FULTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down several trees throughout town.