A large complex of thunderstorms swept across Northeast Colorado producing very large damaging hail, intense thunderstorm winds as well as a couple of weak tornadoes.  Large hail, from 1 to 3 inches in diameter, caused extensive damage to cropland, homes and vehicles.  In southeast Weld County, 50,000 acres of cropland was pummelled.  The combination of heavy rain and hail produced flash flooding over parts of Phillips and Weld Counties.  Electrical outages were also reported in Weld County.  Straight-line winds snapped 6 utility poles near Amherst in Phillips County.  Two small tornado also touched down but no damage was reported.

Hail in DOUGLAS, COLORADO
From 11-JUN-10 17:12:00 to 11-JUN-10 17:12:00 (MST-7)
Location: CASTLE ROCK
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 11-JUN-10 17:01:00 to 11-JUN-10 17:01:00 (MST-7)
Location: BENNETT
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 11-JUN-10 16:47:00 to 11-JUN-10 16:47:00 (MST-7)
Location: WIGGINS
Magnitude: 2.75 
Reported by: County Official

Hail in ELBERT, COLORADO
From 11-JUN-10 16:55:00 to 11-JUN-10 16:55:00 (MST-7)
Location: RIVER BEND
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 11-JUN-10 17:20:00 to 11-JUN-10 17:20:00 (MST-7)
Location: STRASBURG
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 11-JUN-10 16:59:00 to 11-JUN-10 16:59:00 (MST-7)
Location: BYERS
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 11-JUN-10 17:00:00 to 11-JUN-10 17:00:00 (MST-7)
Location: RESOLIS
Magnitude: 2.75 
Reported by: Public

Thunderstorm Wind in MORGAN, COLORADO
From 11-JUN-10 18:15:00 to 11-JUN-10 18:15:00 (MST-7)
Location: WIGGINS
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Thunderstorm Wind in LOGAN, COLORADO
From 11-JUN-10 18:59:00 to 11-JUN-10 18:59:00 (MST-7)
Location: WILLARD
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-JUN-10 17:17:00 to 11-JUN-10 17:17:00 (MST-7)
Location: NEW RAYMER ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in WELD, COLORADO
From 11-JUN-10 16:06:00 to 11-JUN-10 16:06:00 (MST-7)
Location: HEREFORD
Magnitude: 59.00 MG
Reported by: Trained Spotter

Flash Flood in WELD, COLORADO
From 11-JUN-10 17:00:00 to 11-JUN-10 22:00:00 (MST-7)
Location: TONVILLE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 250.00K
Reported by: Storm Chaser

Heavy rain and torrential hail produced flash flooding over southeast Weld County.  Fifty thousand acres of cropland was heavily damaged.  Ham radio spotters reported water running across State Highway 52, east of Prospect Valley, forcing its closure.  In addition, State Highways 14 and 392 near Briggdale were also inundated with water.  Several county roads were either flooded or completely washed out.

Hail in JEFFERSON, COLORADO
From 11-JUN-10 14:10:00 to 11-JUN-10 14:10:00 (MST-7)
Location: GOLDEN
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 11-JUN-10 15:15:00 to 11-JUN-10 15:15:00 (MST-7)
Location: BRIGHTON
Magnitude: 2.50 
Reported by: Trained Spotter

Hail in LINCOLN, COLORADO
From 11-JUN-10 18:33:00 to 11-JUN-10 18:33:00 (MST-7)
Location: ARRIBA
Magnitude: 3.00 
Reported by: Storm Chaser

Hail in JEFFERSON, COLORADO
From 11-JUN-10 14:02:00 to 11-JUN-10 14:02:00 (MST-7)
Location: EVERGREEN
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in JEFFERSON, COLORADO
From 11-JUN-10 14:05:00 to 11-JUN-10 14:05:00 (MST-7)
Location: WAH KEENEY PARK
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in CLEAR CREEK, COLORADO
From 11-JUN-10 14:10:00 to 11-JUN-10 14:10:00 (MST-7)
Location: IDAHO SPGS
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in PHILLIPS, COLORADO
From 11-JUN-10 20:45:00 to 11-JUN-10 20:45:00 (MST-7)
Location: AMHERST
Magnitude: 61.00 EG
Reported by: Trained Spotter

Damaging thunderstorm winds snapped 6 telephone poles off at the base.  The poles were approximately 12 to 14 inches in diameter.  In addition, the storm produced a measured 2.5 inches of rainfall.

Hail in DOUGLAS, COLORADO
From 11-JUN-10 17:03:00 to 11-JUN-10 17:03:00 (MST-7)
Location: GREENLAND
Magnitude: 2.00 
Reported by: Trained Spotter

Flash Flood in ELBERT, COLORADO
From 11-JUN-10 18:00:00 to 11-JUN-10 20:00:00 (MST-7)
Location: RIVER BEND
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Heavy rain caused flash flooding along Interstate 70 at the River Bend Exit.  Several cars were reportedly stuck in the floodwaters.

Hail in LOGAN, COLORADO
From 11-JUN-10 18:26:00 to 11-JUN-10 18:26:00 (MST-7)
Location: PEETZ
Magnitude: 1.75 
Reported by: Trained Spotter

Flash Flood in MORGAN, COLORADO
From 11-JUN-10 18:55:00 to 11-JUN-10 22:30:00 (MST-7)
Location: FT MORGAN
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 50.00K
Reported by: Emergency Manager

Heavy rain triggered flash flooding in the Fort Morgan and Brush areas.  Numerous streets were closed due to the high floodwaters.  Flooding was also reported on County Road T, near State Highway 52.  A trained spotter in Fort Morgan measured 3 inches of rainfall.

Flash Flood in LINCOLN, COLORADO
From 11-JUN-10 18:00:00 to 11-JUN-10 20:00:00 (MST-7)
Location: (LIC)LIMON ARPT
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain caused flash flooding over parts of County Road 3J, forcing its closure.

Hail in JEFFERSON, COLORADO
From 11-JUN-10 14:31:00 to 11-JUN-10 14:31:00 (MST-7)
Location: MOUNTAIN VIEW
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in LINCOLN, COLORADO
From 11-JUN-10 18:25:00 to 11-JUN-10 18:25:00 (MST-7)
Location: ARRIBA
Magnitude: 1.75 
Reported by: Storm Chaser

Hail in LOGAN, COLORADO
From 11-JUN-10 18:26:00 to 11-JUN-10 18:26:00 (MST-7)
Location: PEETZ
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 11-JUN-10 15:00:00 to 11-JUN-10 15:00:00 (MST-7)
Location: HENDERSON
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 11-JUN-10 14:43:00 to 11-JUN-10 14:43:00 (MST-7)
Location: LAFAYETTE
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 11-JUN-10 14:53:00 to 11-JUN-10 14:53:00 (MST-7)
Location: ORSA
Magnitude: 1.50 
Reported by: Trained Spotter

Flash Flood in PHILLIPS, COLORADO
From 11-JUN-10 20:45:00 to 11-JUN-10 23:00:00 (MST-7)
Location: AMHERST
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 50.00K
Reported by: County Official

Heavy rain washed out sections of 20 country roads in Phillips County.

Hail in MORGAN, COLORADO
From 11-JUN-10 18:15:00 to 11-JUN-10 18:15:00 (MST-7)
Location: WIGGINS
Magnitude: 2.75 
Reported by: County Official

Hail in JEFFERSON, COLORADO
From 11-JUN-10 14:40:00 to 11-JUN-10 14:40:00 (MST-7)
Location: MOUNTAIN VIEW
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 11-JUN-10 15:11:00 to 11-JUN-10 15:11:00 (MST-7)
Location: THORNTON
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 11-JUN-10 23:23:00 to 11-JUN-10 23:23:00 (MST-7)
Location: WESTCREEK
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in JEFFERSON, COLORADO
From 11-JUN-10 12:48:00 to 11-JUN-10 12:48:00 (MST-7)
Location: ARVADA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in PARK, COLORADO
From 11-JUN-10 21:45:00 to 11-JUN-10 21:45:00 (MST-7)
Location: HARTSEL
Magnitude: 1.00 
Reported by: Law Enforcement

Hail in PHILLIPS, COLORADO
From 11-JUN-10 20:18:00 to 11-JUN-10 20:18:00 (MST-7)
Location: AMHERST
Magnitude: 1.75 
Reported by: Trained Spotter

The severe thunderstorm also produced a wind gusts to 60 mph.  Heavy rain was also observed, estimated between 3 and 4 inches.

Hail in ADAMS, COLORADO
From 11-JUN-10 15:25:00 to 11-JUN-10 15:25:00 (MST-7)
Location: BARR LAKE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 11-JUN-10 16:30:00 to 11-JUN-10 16:30:00 (MST-7)
Location: HOYT
Magnitude: 3.00 
Reported by: Trained Spotter

Hail in JEFFERSON, COLORADO
From 11-JUN-10 14:14:00 to 11-JUN-10 14:14:00 (MST-7)
Location: IDLEDALE
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 11-JUN-10 15:56:00 to 11-JUN-10 15:56:00 (MST-7)
Location: MANILA
Magnitude: 1.75 
Reported by: Trained Spotter

Tornado in ELBERT, COLORADO
From 11-JUN-10 16:27:00 to 11-JUN-10 16:27:00 (MST-7)
Location: MATHESON
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tornado touched down but no damage.

Thunderstorm Wind in WELD, COLORADO
From 11-JUN-10 03:17:00 to 11-JUN-10 03:17:00 (MST-7)
Location: TONVILLE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LOGAN, COLORADO
From 11-JUN-10 06:59:00 to 11-JUN-10 06:59:00 (MST-7)
Location: CROOK
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WELD, COLORADO
From 11-JUN-10 17:17:00 to 11-JUN-10 17:17:00 (MST-7)
Location: NEW RAYMER ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in LINCOLN, COLORADO
From 11-JUN-10 18:10:00 to 11-JUN-10 18:10:00 (MST-7)
Location: GENOA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A small tornado touched down briefly but did no damage.

Flash Flood in WELD, COLORADO
From 11-JUN-10 17:45:00 to 11-JUN-10 22:30:00 (MST-7)
Location: HEREFORD
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 50.00K
Reported by: Law Enforcement

Heavy rain either flooded or washed out several county roads including 51 and 82.