A strong cold front moved south across the region, triggering strong to severe thunderstorms. Several tornadoes were reported, as well as large hail and damaging winds.

Tornado in KNOX, MISSOURI
From 13-MAY-09 17:49:00 to 13-MAY-09 17:55:00 (CST-6)
Location: KNOX CITY
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A tornado touched down about 3.5 miles northwest of Knox City and traveled to the east.  Two outbuildings sustained major damage with a displaced roof to one of the buildings and the other sustained major damage to one of its walls.  Numerous tree tops were twisted, torn and/or snapped off.  The most severe damage was along County Road 164, about half a mile south of Route AA.  The tornado lifted and dissipated about 2.5 miles north northeast of Knox City.

Tornado in ST. FRANCOIS, MISSOURI
From 14-MAY-09 00:11:00 to 14-MAY-09 00:12:00 (CST-6)
Location: BISMARCK
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Most of the damage in Bismarck was caused by one small tornado.  The survey of damage indicated a brief tornado touched down near Highway BB and Cherry Street, then moved eastward to the northeast edge of town along School Drive.  Most of the damage was to trees, with minor roof damage also common.  More substantial damage was done to a preschool building along Campus Drive, with the gabled roof torn completely from the well constructed masonry building and thrown into the adjacent parking lot.  Damage patterns showed reliable indications of rotation.  The path length was approximately six tenths of a mile long and 200 yards wide.  The severity of roof damage to the preschool building warrents an intensity ranking of EF1 on the Enhanced Fujita Scale.

Hail in MADISON, MISSOURI
From 13-MAY-09 14:28:00 to 13-MAY-09 14:28:00 (CST-6)
Location: FREDERICKTOWN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in SHELBY, MISSOURI
From 13-MAY-09 18:47:00 to 13-MAY-09 18:47:00 (CST-6)
Location: CLARENCE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in STE. GENEVIEVE, MISSOURI
From 14-MAY-09 01:30:00 to 14-MAY-09 05:30:00 (CST-6)
Location: STE GENEVIEVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to three inches of rain fell in a short amount of time causing flash flooding.  In Ste. Genevieve, several roads were flooded and some homes had to be evacuated due to rapidly rising creeks.  A few other roads in the county were flooded.

Tornado in KNOX, MISSOURI
From 13-MAY-09 17:33:00 to 13-MAY-09 17:48:00 (CST-6)
Location: KENWOOD
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A tornado touched down about a mile northeast of Kenwood and traveled to the east.  Numerous trees were sheared, twisted and snapped.  Also, several outbuildings were damaged with displaced roofs, impacted sides and sheet metal thrown up to half a mile away.  The greatest damage was along a stretch of Highway 15 about 2.4 miles north of Edina and along County Roads 155 and 159.  Also, numerous power poles were snapped.  The tornado lifted and dissipated about 4.5 miles east northeast of Edina.

Thunderstorm Wind in SHELBY, MISSOURI
From 13-MAY-09 18:39:00 to 13-MAY-09 18:39:00 (CST-6)
Location: SHELBYVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter