A sharp edge of marginal instability helped cause an area of thunderstorms to develop along the Minnesota-Iowa border near Jackson, and move eastward during the late afternoon. Wind shear values were around 40 kts, which aided in the development of several long lived mesocyclones that caused hail stones to grow above severe levels. A few of the hail stones grew to golf ball size.

Hail in MARTIN, MINNESOTA
From 12-APR-10 14:59:00 to 12-APR-10 14:59:00 (CST-6)
Location: SHERBURN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MARTIN, MINNESOTA
From 12-APR-10 15:25:00 to 12-APR-10 15:25:00 (CST-6)
Location: MANYASKA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported quarter size hail covering the ground.

Hail in MARTIN, MINNESOTA
From 12-APR-10 15:26:00 to 12-APR-10 15:26:00 (CST-6)
Location: MANYASKA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MARTIN, MINNESOTA
From 12-APR-10 16:27:00 to 12-APR-10 16:27:00 (CST-6)
Location: EAST CHAIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MARTIN, MINNESOTA
From 12-APR-10 16:50:00 to 12-APR-10 16:50:00 (CST-6)
Location: IMOGENE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BLUE EARTH, MINNESOTA
From 12-APR-10 18:30:00 to 12-APR-10 18:30:00 (CST-6)
Location: GOOD THUNDER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in BLUE EARTH, MINNESOTA
From 12-APR-10 19:08:00 to 12-APR-10 19:08:00 (CST-6)
Location: BEAUFORD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WASECA, MINNESOTA
From 12-APR-10 19:38:00 to 12-APR-10 19:38:00 (CST-6)
Location: ALMA CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in RENVILLE, MINNESOTA
From 12-APR-10 20:03:00 to 12-APR-10 20:05:00 (CST-6)
Location: SACRED HEART
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MARTIN, MINNESOTA
From 12-APR-10 16:00:00 to 12-APR-10 16:10:00 (CST-6)
Location: EAST CHAIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MARTIN, MINNESOTA
From 12-APR-10 16:00:00 to 12-APR-10 16:12:00 (CST-6)
Location: WILBERT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in FARIBAULT, MINNESOTA
From 12-APR-10 17:15:00 to 12-APR-10 17:25:00 (CST-6)
Location: BLUE EARTH
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BLUE EARTH, MINNESOTA
From 12-APR-10 18:10:00 to 12-APR-10 18:20:00 (CST-6)
Location: GARDEN CITY ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported that the hail covered the ground south of Garden City.

Hail in MARTIN, MINNESOTA
From 12-APR-10 16:05:00 to 12-APR-10 16:05:00 (CST-6)
Location: EAST CHAIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BLUE EARTH, MINNESOTA
From 12-APR-10 19:20:00 to 12-APR-10 19:20:00 (CST-6)
Location: ST CLAIR
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter