A strong cold front moved across the region, triggering showers and thunderstorms.  There were numerous reports of large hail and flash flooding. Also, there were some reports of damaging winds with these storms.

Flash Flood in ST. CHARLES, MISSOURI
From 18-SEP-10 20:45:00 to 19-SEP-10 02:17:00 (CST-6)
Location: ST CHARLES ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Up to two inches of rain fell in a short amount of time causing flash flooding.  Several roads were flooded including the intersection of Winghaven Blvd. and Hawk Run Drive.  A motorist drove through the water and became stranded.  So a water rescue had to be performed.  No injuries were reported.

Thunderstorm Wind in PIKE, MISSOURI
From 18-SEP-10 18:35:00 to 18-SEP-10 18:35:00 (CST-6)
Location: FARMER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew down a large tree onto County Road 452, south of Curryville.  It fell onto some power lines and knocked them down.

Flash Flood in GASCONADE, MISSOURI
From 18-SEP-10 22:45:00 to 19-SEP-10 02:17:00 (CST-6)
Location: HERMANN
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Newspaper

Between 3 and 5 inches of rain fell onto already saturated soils causing flash flooding.  Frene Creek in Hermann rose quickly and came out of its banks next to the city park where dozens of people were camping for the third annual Hermann Cyclocross race.  The police and fire department were able to get everyone out of the campground, though two vehicles were flooded as well as numerous tents, bikes and one popup camper that could not be moved quick enough.  No injuries were reported.

Flash Flood in WARREN, MISSOURI
From 18-SEP-10 22:15:00 to 19-SEP-10 02:00:00 (CST-6)
Location: WARRENTON O SLLVN AR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to two inches of rain fell in a short amount of time causing flash flooding.  Several roads were flooded including Highway U near Tall Oaks Road, portions of Highway 47, and the North Outer Road near Arlington Way in Warrenton.

Flash Flood in LEWIS, MISSOURI
From 18-SEP-10 19:50:00 to 19-SEP-10 02:00:00 (CST-6)
Location: FENWAY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Up to five inches of rain fell in a short amount of time causing flash flooding.  Numerous roads were flooded including the intersection of Highways 16 and Z, Highway P southwest of Canton, Highway C west of LaGrange and Highway J south of Lewistown.

Flash Flood in MARION, MISSOURI
From 18-SEP-10 20:49:00 to 19-SEP-10 02:00:00 (CST-6)
Location: WEST QUINCY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to four inches of rain fell in a short amount of time causing flash flooding.  Numerous roads were flooded including outer roads along U.S. Highway 61 near Taylor.

Hail in SHELBY, MISSOURI
From 18-SEP-10 16:23:00 to 18-SEP-10 16:23:00 (CST-6)
Location: LEONARD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SHELBY, MISSOURI
From 18-SEP-10 16:41:00 to 18-SEP-10 16:41:00 (CST-6)
Location: KELLERVILLE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SHELBY, MISSOURI
From 18-SEP-10 16:44:00 to 18-SEP-10 16:44:00 (CST-6)
Location: SHELBYVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SHELBY, MISSOURI
From 18-SEP-10 17:15:00 to 18-SEP-10 17:15:00 (CST-6)
Location: HUNNEWELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in MONROE, MISSOURI
From 18-SEP-10 17:21:00 to 18-SEP-10 17:21:00 (CST-6)
Location: STOUTSVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CHARLES, MISSOURI
From 18-SEP-10 20:42:00 to 18-SEP-10 20:42:00 (CST-6)
Location: HARVESTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in ST. CHARLES, MISSOURI
From 18-SEP-10 20:50:00 to 18-SEP-10 20:52:00 (CST-6)
Location: WELDON SPG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in JEFFERSON, MISSOURI
From 18-SEP-10 22:20:00 to 18-SEP-10 22:25:00 (CST-6)
Location: ARNOLD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down numerous trees across the northeastern portions of the county.

Hail in ST. CHARLES, MISSOURI
From 18-SEP-10 20:37:00 to 18-SEP-10 20:40:00 (CST-6)
Location: DARDENNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement