Severe thunderstorms developed across southern Meade County and then moved slowly eastward across northeast Pennington, northern Jackson, and Haakon Counties during the late afternoon and early evening. The storms produced very large hail with many reports of golf ball sized hail. When the storms first developed, hail to the size of baseballs fell near Black Hawk.

Hail in MEADE, SOUTH DAKOTA
From 21-MAY-04 13:36:00 to 21-MAY-04 13:36:00 (MST)
Location: PIEDMONT
Magnitude: 2.50 
Property damage: 0
Crop damage: 0
Reported by: TRAINED SPOTTER

Hail in MEADE, SOUTH DAKOTA
From 21-MAY-04 14:20:00 to 21-MAY-04 14:20:00 (MST)
Location: ELLSWORTH AFB
Magnitude: 1.75 
Property damage: 0
Crop damage: 0
Reported by: GENERAL PUBLIC

Hail in MEADE, SOUTH DAKOTA
From 21-MAY-04 14:38:00 to 21-MAY-04 14:38:00 (MST)
Location: HEREFORD
Magnitude: 1.50 
Property damage: 0
Crop damage: 0
Reported by: STORM CHASER

Hail in MEADE, SOUTH DAKOTA
From 21-MAY-04 15:20:00 to 21-MAY-04 15:20:00 (MST)
Location: ELM SPGS
Magnitude: 0.75 
Property damage: 0
Crop damage: 0
Reported by: GENERAL PUBLIC

Hail in PENNINGTON, SOUTH DAKOTA
From 21-MAY-04 17:15:00 to 21-MAY-04 17:25:00 (MST)
Location: CREIGHTON
Magnitude: 1.50 
Property damage: 0
Crop damage: 0
Reported by: GENERAL PUBLIC

Hail in PENNINGTON, SOUTH DAKOTA
From 21-MAY-04 17:30:00 to 21-MAY-04 17:30:00 (MST)
Location: CREIGHTON
Magnitude: 1.00 
Property damage: 0
Crop damage: 0
Reported by: TRAINED SPOTTER

Hail in MEADE, SOUTH DAKOTA
From 21-MAY-04 13:22:00 to 21-MAY-04 13:30:00 (MST)
Location: BLACK HAWK
Magnitude: 2.75 
Property damage: 100K
Crop damage: 0
Reported by: GENERAL PUBLIC

Quarter to Baseball sized hail fell for several minutes causing automobile accidents and hail damage to automobiles.

Hail in MEADE, SOUTH DAKOTA
From 21-MAY-04 13:25:00 to 21-MAY-04 13:30:00 (MST)
Location: BLACK HAWK
Magnitude: 1.00 
Property damage: 0
Crop damage: 0
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in HAAKON, SOUTH DAKOTA
From 21-MAY-04 17:40:00 to 21-MAY-04 17:40:00 (MST)
Location: PHILIP
Magnitude: 0.88 
Property damage: 0
Crop damage: 0
Reported by: TRAINED SPOTTER

Hail in HAAKON, SOUTH DAKOTA
From 21-MAY-04 17:45:00 to 21-MAY-04 17:45:00 (MST)
Location: MILESVILLE
Magnitude: 1.00 
Property damage: 0
Crop damage: 0
Reported by: TRAINED SPOTTER

Hail in HAAKON, SOUTH DAKOTA
From 21-MAY-04 17:50:00 to 21-MAY-04 17:50:00 (MST)
Location: KIRLEY
Magnitude: 1.25 
Property damage: 0
Crop damage: 0
Reported by: TRAINED SPOTTER

Hail in MEADE, SOUTH DAKOTA
From 21-MAY-04 16:50:00 to 21-MAY-04 16:50:00 (MST)
Location: ELM SPGS
Magnitude: 0.75 
Property damage: 0
Crop damage: 0
Reported by: GENERAL PUBLIC

Hail in HAAKON, SOUTH DAKOTA
From 21-MAY-04 17:15:00 to 21-MAY-04 17:15:00 (MST)
Location: PHILIP
Magnitude: 1.00 
Property damage: 0
Crop damage: 0
Reported by: GENERAL PUBLIC

Hail in HAAKON, SOUTH DAKOTA
From 21-MAY-04 18:15:00 to 21-MAY-04 18:15:00 (MST)
Location: BILLSBURG
Magnitude: 1.75 
Property damage: 0
Crop damage: 0
Reported by: GENERAL PUBLIC

Hail in HAAKON, SOUTH DAKOTA
From 21-MAY-04 18:20:00 to 21-MAY-04 18:20:00 (MST)
Location: OTTUMWA
Magnitude: 0.75 
Property damage: 0
Crop damage: 0
Reported by: GENERAL PUBLIC

Hail in HAAKON, SOUTH DAKOTA
From 21-MAY-04 16:55:00 to 21-MAY-04 16:55:00 (MST)
Location: PHILIP
Magnitude: 1.75 
Property damage: 0
Crop damage: 0
Reported by: LAW ENFORCEMENT

Hail in JACKSON, SOUTH DAKOTA
From 21-MAY-04 16:45:00 to 21-MAY-04 16:45:00 (MST)
Location: COTTONWOOD
Magnitude: 1.75 
Property damage: 0
Crop damage: 0
Reported by: GENERAL PUBLIC

Hail in HAAKON, SOUTH DAKOTA
From 21-MAY-04 17:12:00 to 21-MAY-04 17:12:00 (MST)
Location: PHILIP
Magnitude: 1.75 
Property damage: 0
Crop damage: 0
Reported by: LAW ENFORCEMENT