An upper level low over western Kansas combined with a cold front moved into the region and produced severe thunderstorms.  Numerous severe storms and a few supercells produced very large hail and high wind gusts as the front moved through the region.

Hail in WRIGHT, MISSOURI
From 12-MAY-11 20:30:00 to 12-MAY-11 20:30:00 (CST-6)
Location: MANSFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in PULASKI, MISSOURI
From 12-MAY-11 20:40:00 to 12-MAY-11 20:40:00 (CST-6)
Location: WAYNESVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PHELPS, MISSOURI
From 12-MAY-11 21:17:00 to 12-MAY-11 21:17:00 (CST-6)
Location: ROLLA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in OREGON, MISSOURI
From 12-MAY-11 22:15:00 to 12-MAY-11 22:15:00 (CST-6)
Location: ALTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in SHANNON, MISSOURI
From 12-MAY-11 23:00:00 to 12-MAY-11 23:00:00 (CST-6)
Location: MUNSETT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Several trees were uprooted by thunderstorm winds along Highway 19 four miles south of Eminence. Additional trees were blown down on Highway 106.

Hail in ST. CLAIR, MISSOURI
From 12-MAY-11 17:02:00 to 12-MAY-11 17:02:00 (CST-6)
Location: TIFFIN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in POLK, MISSOURI
From 12-MAY-11 17:10:00 to 12-MAY-11 17:10:00 (CST-6)
Location: HURON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in POLK, MISSOURI
From 12-MAY-11 17:14:00 to 12-MAY-11 17:14:00 (CST-6)
Location: DUNNEGAN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in JASPER, MISSOURI
From 12-MAY-11 17:15:00 to 12-MAY-11 17:15:00 (CST-6)
Location: CARL JCT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WRIGHT, MISSOURI
From 12-MAY-11 16:10:00 to 12-MAY-11 16:10:00 (CST-6)
Location: CEDAR GAP
Magnitude: 2.75 
Property damage: 50.00K
Reported by: Trained Spotter

Hail fell in town producing roof and car damage.

Hail in DADE, MISSOURI
From 12-MAY-11 16:20:00 to 12-MAY-11 16:20:00 (CST-6)
Location: ERNEST
Magnitude: 2.00 
Property damage: 10.00K
Reported by: Public

Hail in ST. CLAIR, MISSOURI
From 12-MAY-11 16:30:00 to 12-MAY-11 16:30:00 (CST-6)
Location: OSCEOLA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DADE, MISSOURI
From 12-MAY-11 16:36:00 to 12-MAY-11 16:36:00 (CST-6)
Location: CIRCOLA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in CAMDEN, MISSOURI
From 12-MAY-11 16:50:00 to 12-MAY-11 16:50:00 (CST-6)
Location: MACKS CREEK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail fell just south of town in a mainly rural location.

Hail in POLK, MISSOURI
From 12-MAY-11 17:00:00 to 12-MAY-11 17:00:00 (CST-6)
Location: FAIR PLAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LACLEDE, MISSOURI
From 12-MAY-11 17:15:00 to 12-MAY-11 17:15:00 (CST-6)
Location: ABO
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail to the size of tennis balls was reported in a mainly rural area and relayed by the media.

Hail in CAMDEN, MISSOURI
From 12-MAY-11 17:16:00 to 12-MAY-11 17:16:00 (CST-6)
Location: SUNRISE BEACH
Magnitude: 1.75 
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail fell in a sparsely populated area. However, a few homes and businesses received some roof damage.

Hail in CAMDEN, MISSOURI
From 12-MAY-11 17:20:00 to 12-MAY-11 17:20:00 (CST-6)
Location: SUNRISE BEACH
Magnitude: 4.25 
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail to the size of softballs fell damaging roofs of homes and businesses. The hail also broke windows out of cars and damaged other structures.

Hail in HICKORY, MISSOURI
From 12-MAY-11 17:39:00 to 12-MAY-11 17:39:00 (CST-6)
Location: PITTSBURG
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HICKORY, MISSOURI
From 12-MAY-11 18:13:00 to 12-MAY-11 18:13:00 (CST-6)
Location: JORDAN
Magnitude: 2.00 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail fell in the town of Almon damaging roofs and cars.

Hail in CAMDEN, MISSOURI
From 12-MAY-11 18:25:00 to 12-MAY-11 18:25:00 (CST-6)
Location: MACKS CREEK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in DALLAS, MISSOURI
From 12-MAY-11 19:20:00 to 12-MAY-11 19:20:00 (CST-6)
Location: URBANA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash Flood in MARIES, MISSOURI
From 12-MAY-11 21:55:00 to 12-MAY-11 21:55:00 (CST-6)
Location: SHANTYTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Two to two and a half feet of water was flowing over County Road 624 in the vicinity of Maries Creek.

Hail in DOUGLAS, MISSOURI
From 12-MAY-11 15:46:00 to 12-MAY-11 15:46:00 (CST-6)
Location: HEST
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in VERNON, MISSOURI
From 12-MAY-11 16:19:00 to 12-MAY-11 16:19:00 (CST-6)
Location: BRONAUGH
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in DADE, MISSOURI
From 12-MAY-11 16:21:00 to 12-MAY-11 16:21:00 (CST-6)
Location: CIRCOLA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in JASPER, MISSOURI
From 12-MAY-11 17:10:00 to 12-MAY-11 17:10:00 (CST-6)
Location: CARL JCT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Funnel Cloud in JASPER, MISSOURI
From 12-MAY-11 17:20:00 to 12-MAY-11 18:20:00 (CST-6)
Location: BROOKLYN HGTS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in JASPER, MISSOURI
From 12-MAY-11 17:20:00 to 12-MAY-11 17:20:00 (CST-6)
Location: ORONOGO
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

There was minor siding damage to a couple homes and a couple trees were blown down.

Thunderstorm Wind in BARTON, MISSOURI
From 12-MAY-11 17:45:00 to 12-MAY-11 17:45:00 (CST-6)
Location: NEWPORT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A few trees were blown down near Newport.

Thunderstorm Wind in GREENE, MISSOURI
From 12-MAY-11 19:31:00 to 12-MAY-11 19:31:00 (CST-6)
Location: SEQUIOTA
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A power line was blown down near Rogers and Fremont streets.

Thunderstorm Wind in GREENE, MISSOURI
From 12-MAY-11 19:25:00 to 12-MAY-11 19:25:00 (CST-6)
Location: BATTLEFIELD
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LACLEDE, MISSOURI
From 12-MAY-11 17:20:00 to 12-MAY-11 17:20:00 (CST-6)
Location: FALCON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in HICKORY, MISSOURI
From 12-MAY-11 17:25:00 to 12-MAY-11 17:25:00 (CST-6)
Location: PITTSBURG
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in JASPER, MISSOURI
From 12-MAY-11 17:40:00 to 12-MAY-11 17:40:00 (CST-6)
Location: JASPER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in DOUGLAS, MISSOURI
From 12-MAY-11 20:14:00 to 12-MAY-11 20:14:00 (CST-6)
Location: AVA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

An amateur radio operator estimated wind gusts up to 60 mph.

Thunderstorm Wind in DOUGLAS, MISSOURI
From 12-MAY-11 20:12:00 to 12-MAY-11 20:12:00 (CST-6)
Location: ROME
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down along Highway A.

Hail in LACLEDE, MISSOURI
From 12-MAY-11 17:43:00 to 12-MAY-11 17:43:00 (CST-6)
Location: HAZELGREEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in NEWTON, MISSOURI
From 12-MAY-11 17:46:00 to 12-MAY-11 17:46:00 (CST-6)
Location: SENECA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in DALLAS, MISSOURI
From 12-MAY-11 17:47:00 to 12-MAY-11 17:47:00 (CST-6)
Location: LOUISBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Hail in NEWTON, MISSOURI
From 12-MAY-11 17:55:00 to 12-MAY-11 17:55:00 (CST-6)
Location: FREDVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DADE, MISSOURI
From 12-MAY-11 18:00:00 to 12-MAY-11 18:00:00 (CST-6)
Location: GREENFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DOUGLAS, MISSOURI
From 12-MAY-11 19:56:00 to 12-MAY-11 19:56:00 (CST-6)
Location: ROY
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

One hundred feet of roofing was blown off of a home.

Thunderstorm Wind in PHELPS, MISSOURI
From 12-MAY-11 21:17:00 to 12-MAY-11 21:17:00 (CST-6)
Location: ROLLA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public estimated wind gusts up to 60 mph.

Thunderstorm Wind in POLK, MISSOURI
From 12-MAY-11 18:45:00 to 12-MAY-11 18:45:00 (CST-6)
Location: BOLIVAR
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A large sign was damaged.

Thunderstorm Wind in OZARK, MISSOURI
From 12-MAY-11 20:35:00 to 12-MAY-11 20:35:00 (CST-6)
Location: TECUMSEH
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A couple trees were blown down.

Thunderstorm Wind in GREENE, MISSOURI
From 12-MAY-11 18:55:00 to 12-MAY-11 18:55:00 (CST-6)
Location: REPUBLIC
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A barn was damaged.

Thunderstorm Wind in DOUGLAS, MISSOURI
From 12-MAY-11 20:00:00 to 12-MAY-11 20:00:00 (CST-6)
Location: AVA
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Flash Flood in MARIES, MISSOURI
From 12-MAY-11 23:08:00 to 12-MAY-11 23:08:00 (CST-6)
Location: SHANTYTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flooding was reported of low water crossings.

Hail in MORGAN, MISSOURI
From 12-MAY-11 18:05:00 to 12-MAY-11 18:05:00 (CST-6)
Location: MARVIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CEDAR, MISSOURI
From 12-MAY-11 18:05:00 to 12-MAY-11 18:05:00 (CST-6)
Location: JERICO SPGS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CAMDEN, MISSOURI
From 12-MAY-11 18:16:00 to 12-MAY-11 18:16:00 (CST-6)
Location: MACKS CREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in JASPER, MISSOURI
From 12-MAY-11 18:25:00 to 12-MAY-11 18:25:00 (CST-6)
Location: SARCOXIE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in CAMDEN, MISSOURI
From 12-MAY-11 18:45:00 to 12-MAY-11 18:45:00 (CST-6)
Location: SUNRISE BEACH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in DALLAS, MISSOURI
From 12-MAY-11 18:55:00 to 12-MAY-11 18:55:00 (CST-6)
Location: URBANA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in LACLEDE, MISSOURI
From 12-MAY-11 20:04:00 to 12-MAY-11 20:04:00 (CST-6)
Location: ELDRIDGE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in LACLEDE, MISSOURI
From 12-MAY-11 20:12:00 to 12-MAY-11 20:12:00 (CST-6)
Location: HAZELGREEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy Rain in MILLER, MISSOURI
From 13-MAY-11 00:06:00 to 13-MAY-11 00:06:00 (CST-6)
Location: IBERIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A total rainfall of 3.20 inches was measured from multiple rounds of thunderstorms.

Heavy Rain in PULASKI, MISSOURI
From 13-MAY-11 00:22:00 to 13-MAY-11 00:22:00 (CST-6)
Location: DIXON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A total rainfall of 2.74 inches was measured from multiple rounds of thunderstorms.

Thunderstorm Wind in HOWELL, MISSOURI
From 12-MAY-11 22:00:00 to 12-MAY-11 22:00:00 (CST-6)
Location: WEST PLAINS ARPT
Magnitude: 62.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Straight line winds of at least 70 mph intermittently downed trees starting at Highway 63 on the northwest side of West Plains. The path continued for three miles to the east northeast of town.

Tornado in ST. CLAIR, MISSOURI
From 11-MAY-11 19:35:00 to 11-MAY-11 19:38:00 (CST-6)
Location: APPLETON CITY
Tornado F-scale: EF0
Property damage: 8.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A National Weather Service storm survey determined that an EF-0 tornado touched down near the western edge of Appleton City and continued intermittently to near 2.5 miles northeast of town. The tornado downed several trees and caused minor shingle and roof damage to a few homes.

Hail in CEDAR, MISSOURI
From 12-MAY-11 16:00:00 to 12-MAY-11 16:00:00 (CST-6)
Location: BEARCREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in NEWTON, MISSOURI
From 12-MAY-11 18:05:00 to 12-MAY-11 18:05:00 (CST-6)
Location: DIAMOND SHEPERD ARPT
Magnitude: 2.75 
Reported by: Amateur Radio

Thunderstorm Wind in LACLEDE, MISSOURI
From 12-MAY-11 20:11:00 to 12-MAY-11 20:11:00 (CST-6)
Location: LEBANON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager estimated wind gusts up to 60 mph.

Thunderstorm Wind in DOUGLAS, MISSOURI
From 12-MAY-11 15:45:00 to 12-MAY-11 15:45:00 (CST-6)
Location: AVA
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several large limbs were blown down around town along with isolated power outages.