A weak surface front across the Ozarks interacted with several upper level disturbances moving across the region. Several rounds of strong to severe storms occurred as a couple of mesoscale convective system were produced. As a result, widespread wind damage and very large hail occurred.

Hail in LAWRENCE, MISSOURI
From 20-AUG-11 16:40:00 to 20-AUG-11 16:40:00 (CST-6)
Location: STOTTS CITY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported half dollar size hail at the Super Stop gas station.

Hail in LAWRENCE, MISSOURI
From 20-AUG-11 16:46:00 to 20-AUG-11 16:46:00 (CST-6)
Location: FRIESTATT
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

TV media relayed a public report of golf ball size hail in Freistatt. There was another public report of golf ball size hail on I-44 in the same area.

Hail in LAWRENCE, MISSOURI
From 20-AUG-11 17:06:00 to 20-AUG-11 17:06:00 (CST-6)
Location: AURORA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LAWRENCE, MISSOURI
From 20-AUG-11 17:15:00 to 20-AUG-11 17:15:00 (CST-6)
Location: AURORA
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

TV media relayed a report of golf ball size hail in Aurora.

Hail in LAWRENCE, MISSOURI
From 20-AUG-11 17:22:00 to 20-AUG-11 17:22:00 (CST-6)
Location: AURORA
Magnitude: 2.75 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Baseball size hail broke sky lights at the Walmart.

Hail in STONE, MISSOURI
From 20-AUG-11 17:23:00 to 20-AUG-11 17:23:00 (CST-6)
Location: CRANE
Magnitude: 2.50 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The Fire Chief reported tennis ball size hail.

Thunderstorm Wind in BARRY, MISSOURI
From 18-AUG-11 04:05:00 to 18-AUG-11 04:05:00 (CST-6)
Location: BUTTERFIELD
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A downed tree blocked both lanes of Highway U about three miles east of Butterfield.

Thunderstorm Wind in HOWELL, MISSOURI
From 18-AUG-11 07:45:00 to 18-AUG-11 07:45:00 (CST-6)
Location: MOODY
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was blown down across Highway E.

Thunderstorm Wind in BENTON, MISSOURI
From 19-AUG-11 00:10:00 to 19-AUG-11 00:10:00 (CST-6)
Location: LAKE CREEK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A wind gust was estimated by ambulance crew and relayed to county law enforcement.

Thunderstorm Wind in MORGAN, MISSOURI
From 19-AUG-11 00:55:00 to 19-AUG-11 00:55:00 (CST-6)
Location: GRAVOIS MILLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A volunteer weather observer reported 58 mph winds.

Thunderstorm Wind in MILLER, MISSOURI
From 19-AUG-11 01:10:00 to 19-AUG-11 01:10:00 (CST-6)
Location: TUSCUMBIA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The wind gust was reported by the Miller County 911 center.

Thunderstorm Wind in MILLER, MISSOURI
From 19-AUG-11 01:00:00 to 19-AUG-11 01:00:00 (CST-6)
Location: BAGNELL
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: County Official

A downed tree blocked the road on Highway W.

Thunderstorm Wind in MILLER, MISSOURI
From 20-AUG-11 04:35:00 to 20-AUG-11 04:35:00 (CST-6)
Location: BAGNELL
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: County Official

Power lines were reported down in the western portion of Miller County.

Thunderstorm Wind in CAMDEN, MISSOURI
From 20-AUG-11 04:25:00 to 20-AUG-11 04:25:00 (CST-6)
Location: OSAGE BEACH
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: County Official

A tree was downed on the Miller and Camden county line.

Thunderstorm Wind in MARIES, MISSOURI
From 20-AUG-11 05:00:00 to 20-AUG-11 05:00:00 (CST-6)
Location: BRINKTOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed on Highway 42.

Thunderstorm Wind in PHELPS, MISSOURI
From 20-AUG-11 05:20:00 to 20-AUG-11 05:20:00 (CST-6)
Location: DOOLITTLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement estimated 60 to 70 mph wind gusts.

Thunderstorm Wind in MILLER, MISSOURI
From 20-AUG-11 05:00:00 to 20-AUG-11 05:00:00 (CST-6)
Location: IBERIA
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: COOP Observer

A weather observer reported a couple trees blown down.

Thunderstorm Wind in PHELPS, MISSOURI
From 20-AUG-11 06:00:00 to 20-AUG-11 06:00:00 (CST-6)
Location: ROLLA
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were blown down onto power lines.

Thunderstorm Wind in TANEY, MISSOURI
From 20-AUG-11 18:25:00 to 20-AUG-11 18:25:00 (CST-6)
Location: KISSEE MILLS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The fire department estimated 70 mph wind gusts.

Thunderstorm Wind in TANEY, MISSOURI
From 20-AUG-11 18:25:00 to 20-AUG-11 18:25:00 (CST-6)
Location: HOLLISTER
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A power pole was blown down.

Thunderstorm Wind in TANEY, MISSOURI
From 20-AUG-11 18:10:00 to 20-AUG-11 18:10:00 (CST-6)
Location: FORSYTH
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were blown down just east of Forsyth.