Isolated pulse thunderstorms developed across the region.  Some of the storms produced damaging winds and isolated large hail.

Thunderstorm Wind in ST. LOUIS (C), MISSOURI
From 12-AUG-10 11:57:00 to 12-AUG-10 11:57:00 (CST-6)
Location: ST LOUIS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds blew down a large tree on the north side of St. Louis.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 12-AUG-10 12:02:00 to 12-AUG-10 12:02:00 (CST-6)
Location: (SUS)SPIRIT/ST LOUIS
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 12-AUG-10 12:12:00 to 12-AUG-10 12:12:00 (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 ST. LOUIS, MISSOURI
From 12-AUG-10 12:18:00 to 12-AUG-10 12:18:00 (CST-6)
Location: CHESTERFIELD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew over a large tree.

Thunderstorm Wind in ST. LOUIS (C), MISSOURI
From 12-AUG-10 12:45:00 to 12-AUG-10 12:45:00 (CST-6)
Location: ST LOUIS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds blew down numerous trees, tree limbs and power lines on the northside of St. Louis.  Also, a house on Bircher Blvd. sustained major roof damage with a portion of the roof being blown off.

Thunderstorm Wind in ST. FRANCOIS, MISSOURI
From 12-AUG-10 12:35:00 to 12-AUG-10 12:35:00 (CST-6)
Location: HAZEL RUN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down several power lines east of Bonne Terre.

Thunderstorm Wind in LINCOLN, MISSOURI
From 12-AUG-10 14:00:00 to 12-AUG-10 14:00:00 (CST-6)
Location: TROY
Magnitude: 52.00 EG
Reported by: Amateur Radio

Six to eight inch tree limbs were broken by thunderstorm winds.

Thunderstorm Wind in LINCOLN, MISSOURI
From 12-AUG-10 14:15:00 to 12-AUG-10 14:15:00 (CST-6)
Location: MOSCOW MILLS
Magnitude: 56.00 EG
Reported by: Amateur Radio

Five utility poles were pushed over and were leaning at a 30 degree angle on the northeast side of town.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 12-AUG-10 13:35:00 to 12-AUG-10 13:35:00 (CST-6)
Location: DARDENNE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off-duty National Weather Service employee reported 60 mph wind gusts and pea sized hail at the intersection of Interstate 64 and Winghaven Blvd.

Thunderstorm Wind in COLE, MISSOURI
From 12-AUG-10 14:20:00 to 12-AUG-10 14:20:00 (CST-6)
Location: JEFFERSON CITY
Magnitude: 52.00 EG
Reported by: Trained Spotter

A street sign was blown over and large tree limbs were blown down.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 12-AUG-10 12:08:00 to 12-AUG-10 12:10:00 (CST-6)
Location: HARVESTER
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds caused considerable damage in the Harvester area.  Numerous trees, tree limbs and power lines were blown down. Also, several buildings sustained minor to moderate roof damage.  At an auto repair business, an employee sustained a cut to his hand due to flying debris.  A nearby stripmall had major roof damage and an air conditioning unit on the roof was blown off.  A little further to the east, an 80 foot by 40 foot tent was blown over and the produce that was being sold there was scattered on the ground.

Flash Flood in LINCOLN, MISSOURI
From 12-AUG-10 14:50:00 to 12-AUG-10 17:30:00 (CST-6)
Location: SOUTH TROY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Several streets in downtown Troy were flooded and became impassable. Numerous intersections across town were underwater.