Isolated thunderstorms developed over eastern Colorado and produced generally quarter to half dollar size hail though a few reports of golf ball size hail were received.

Hail in KIT CARSON, COLORADO
From 21-MAY-08 18:45:00 to 21-MAY-08 18:45:00 (MST-7)
Location: SEIBERT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in KIT CARSON, COLORADO
From 21-MAY-08 18:48:00 to 21-MAY-08 18:48:00 (MST-7)
Location: SEIBERT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YUMA, COLORADO
From 21-MAY-08 15:56:00 to 21-MAY-08 15:57:00 (MST-7)
Location: ABARR
Magnitude: 1.75 
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Public

NSSL SHAVE project relayed public report of golf ball size lasting one minute. This hail resulted in damage to a vehicle.

Hail in KIT CARSON, COLORADO
From 21-MAY-08 18:37:00 to 21-MAY-08 18:37:00 (MST-7)
Location: SEIBERT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

NSSL SHAVE project relayed a report of golf ball size hail.

Hail in YUMA, COLORADO
From 21-MAY-08 14:06:00 to 21-MAY-08 14:06:00 (MST-7)
Location: JOES
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YUMA, COLORADO
From 21-MAY-08 14:25:00 to 21-MAY-08 14:25:00 (MST-7)
Location: JOES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YUMA, COLORADO
From 21-MAY-08 14:44:00 to 21-MAY-08 14:44:00 (MST-7)
Location: JOES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported to have covered the ground.

Hail in YUMA, COLORADO
From 21-MAY-08 14:57:00 to 21-MAY-08 14:57:00 (MST-7)
Location: JOES
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YUMA, COLORADO
From 21-MAY-08 15:18:00 to 21-MAY-08 15:18:00 (MST-7)
Location: ABARR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YUMA, COLORADO
From 21-MAY-08 15:30:00 to 21-MAY-08 15:30:00 (MST-7)
Location: YUMA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YUMA, COLORADO
From 21-MAY-08 15:47:00 to 21-MAY-08 15:47:00 (MST-7)
Location: YUMA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YUMA, COLORADO
From 21-MAY-08 15:50:00 to 21-MAY-08 15:50:00 (MST-7)
Location: YUMA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser relayed a report of quarter size hail via Spotter Network.

Hail in YUMA, COLORADO
From 21-MAY-08 16:01:00 to 21-MAY-08 16:01:00 (MST-7)
Location: YUMA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser relayed a report of penny size hail via Spotter Network.

Hail in YUMA, COLORADO
From 21-MAY-08 16:01:00 to 21-MAY-08 16:01:00 (MST-7)
Location: YUMA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YUMA, COLORADO
From 21-MAY-08 16:05:00 to 21-MAY-08 16:05:00 (MST-7)
Location: ECKLEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YUMA, COLORADO
From 21-MAY-08 16:35:00 to 21-MAY-08 16:35:00 (MST-7)
Location: ECKLEY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in KIT CARSON, COLORADO
From 21-MAY-08 17:42:00 to 21-MAY-08 17:42:00 (MST-7)
Location: FLAGLER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in KIT CARSON, COLORADO
From 21-MAY-08 17:48:00 to 21-MAY-08 17:48:00 (MST-7)
Location: SEIBERT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail was reported to be flat and soft.

Hail in KIT CARSON, COLORADO
From 21-MAY-08 18:27:00 to 21-MAY-08 18:27:00 (MST-7)
Location: SEIBERT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in YUMA, COLORADO
From 21-MAY-08 15:14:00 to 21-MAY-08 15:16:00 (MST-7)
Location: JOES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple reports of penny to quarter size hail relayed by the NSSL SHAVE project.