A strong cold front and upper level storm system, caused pre-frontal severe thunderstorms with large hail, in the early evening hours of May 12, 2010. A line of severe thunderstorms was generated along the cold front, in the late evening hours of May 12, 2010, with numerous reports of damaging winds.

Thunderstorm Wind in JOHNSON, KANSAS
From 12-MAY-10 22:23:00 to 12-MAY-10 22:23:00 (CST-6)
Location: CEDAR
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in LEAVENWORTH, KANSAS
From 12-MAY-10 22:23:00 to 12-MAY-10 22:23:00 (CST-6)
Location: LENAPE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds were estimated to 60 mph.

Thunderstorm Wind in JOHNSON, KANSAS
From 12-MAY-10 22:26:00 to 12-MAY-10 22:26:00 (CST-6)
Location: HOLLIDAY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm wind gusts were estimated up to 70 mph.

Thunderstorm Wind in WYANDOTTE, KANSAS
From 12-MAY-10 22:28:00 to 12-MAY-10 22:28:00 (CST-6)
Location: PIPER
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Large trees and power lines were reported down.

Thunderstorm Wind in WYANDOTTE, KANSAS
From 12-MAY-10 22:30:00 to 12-MAY-10 22:30:00 (CST-6)
Location: PIPER
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JOHNSON, KANSAS
From 12-MAY-10 16:45:00 to 12-MAY-10 16:45:00 (CST-6)
Location: WESTWOOD HILLS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in JOHNSON, KANSAS
From 12-MAY-10 18:20:00 to 12-MAY-10 18:20:00 (CST-6)
Location: CEDAR
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WYANDOTTE, KANSAS
From 12-MAY-10 18:25:00 to 12-MAY-10 18:25:00 (CST-6)
Location: BONNER SPGS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WYANDOTTE, KANSAS
From 12-MAY-10 18:30:00 to 12-MAY-10 18:30:00 (CST-6)
Location: PIPER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JOHNSON, KANSAS
From 12-MAY-10 18:43:00 to 12-MAY-10 18:43:00 (CST-6)
Location: CEDAR
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in MIAMI, KANSAS
From 13-MAY-10 00:45:00 to 13-MAY-10 00:45:00 (CST-6)
Location: PAOLA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in JOHNSON, KANSAS
From 12-MAY-10 22:18:00 to 12-MAY-10 22:18:00 (CST-6)
Location: GARDNER
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A two to three foot in diameter tree was blown into a house. Windows were also blown out and cars were moved. Winds were estimated to 70 mph.

Thunderstorm Wind in JOHNSON, KANSAS
From 12-MAY-10 22:23:00 to 12-MAY-10 22:23:00 (CST-6)
Location: CEDAR
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A barn was reported to have blown over, near K10 Highway and Kill Creek Road.

Thunderstorm Wind in JOHNSON, KANSAS
From 12-MAY-10 22:25:00 to 12-MAY-10 22:25:00 (CST-6)
Location: OLATHE
Magnitude: 61.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds up to 70 mph, caused damage from 151st and Lone Elm Road, to the 1100 block of South Clairborne Road. Ten to twenty trees were reported down, along with 3 light poles. The wall of a building collapsed, and an overhead door was blown in. A home also had several windows blown out.

Thunderstorm Wind in JOHNSON, KANSAS
From 12-MAY-10 22:25:00 to 12-MAY-10 22:25:00 (CST-6)
Location: HOLLIDAY
Magnitude: 61.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds up to 70 mph, caused extensive tree and power line damage.

Thunderstorm Wind in LEAVENWORTH, KANSAS
From 12-MAY-10 22:30:00 to 12-MAY-10 22:30:00 (CST-6)
Location: LOWEMONT
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated to 70 mph, caused an eight inch diamater tree to fall on a house. Numerous large tree limbs down, from 19100 block to the 18700 block of Santa Fe Drive.

Hail in LEAVENWORTH, KANSAS
From 12-MAY-10 22:25:00 to 12-MAY-10 22:25:00 (CST-6)
Location: BASEHOR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee