Very heavy rain occurred across some areas of northeast Colorado from June 11th until the early hours of June 12th with flash flooding in some areas.  The worst areas were south and southeast of Fort Collins towards Timnath and Windsor and in the Milliken area.  Locations in these areas received from 3.0 to  5.5 inches of rain.  Another area was located in and near Limon where significant flash flooding occurred along with a few water rescues.  Several roads were closed due to flash flooding north of CO-86 and west of I-70. Rainfall amounts in the these areas ranged from 2.4 to 3.7 inches. Severe thunderstorms produced large hail, from quarter to ping pong ball size.  The hail piled anywhere from 4 to 8 inches deep along roads and highways in Elbert and Lincoln counties.

Hail in ELBERT, COLORADO
From 11-JUN-23 20:10:00 to 11-JUN-23 20:10:00 (MST-7)
Location: MATHESON
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-JUN-23 18:56:00 to 11-JUN-23 18:56:00 (MST-7)
Location: JOHNSTOWN
Magnitude: 1.00 
Reported by: Public

Hail in ELBERT, COLORADO
From 11-JUN-23 20:30:00 to 11-JUN-23 20:30:00 (MST-7)
Location: MATHESON
Magnitude: 1.00 
Reported by: Trained Spotter

Flash Flood in LARIMER, COLORADO
From 11-JUN-23 17:32:00 to 11-JUN-23 19:13:00 (MST-7)
Location: DRAKES
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Heavy rainfall caused flooding and flash flooding in and around Fort Collins.  The worst areas were south and southeast of Fort Collins towards Timnath.  Locations in these areas received from 3 to 5 inches of rain.   Widespread street flooding with road closures were reported.  Numerous vehicles were stranded in standing water in excess of 6 inches in depth.

Flash Flood in LARIMER, COLORADO
From 11-JUN-23 14:30:00 to 11-JUN-23 15:30:00 (MST-7)
Location: RUSTIC
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: County Official

Heavy rain produced flooding along Sheep Creek which briefly blocked the roadway. Damage to the road was minor.

Flash Flood in LARIMER, COLORADO
From 11-JUN-23 15:30:00 to 11-JUN-23 16:30:00 (MST-7)
Location: RUSTIC
Flood cause: Heavy Rain / Burn Area
Property damage: 5.00K
Crop damage: 0.00K
Reported by: County Official

Localized flooding was observed along Rustic Road, which blocked the access to one residence.

Flash Flood in ELBERT, COLORADO
From 11-JUN-23 22:00:00 to 12-JUN-23 01:00:00 (MST-7)
Location: MATHESON
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash flooding washed out or damaged several county roads north of CO-86 and west of Interstate 70.

Flash Flood in WELD, COLORADO
From 11-JUN-23 18:49:00 to 11-JUN-23 21:30:00 (MST-7)
Location: WINDSOR
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Heavy produced flash flooding in and around Milliken to west of Windsor.  Storm totals in these areas ranged from 2.5 to 5.0 inches.  Several road closures were in place due to standing water.

Flash Flood in LINCOLN, COLORADO
From 11-JUN-23 22:00:00 to 12-JUN-23 02:00:00 (MST-7)
Location: GENOA
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported thunderstorms with torrential rain and hail. Storm totals around Limon and Hugo ranged from 2.4 to 3.7 inches.  The hail piled up several inches deep along highways 24 and 71, stranding vehicles.  Floodwaters up to 2 feet deep were observe running across a roadway 3 miles south of Limon.

Hail in ELBERT, COLORADO
From 11-JUN-23 20:14:00 to 11-JUN-23 20:14:00 (MST-7)
Location: MATHESON
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 11-JUN-23 16:28:00 to 11-JUN-23 16:28:00 (MST-7)
Location: KIOWA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 11-JUN-23 14:02:00 to 11-JUN-23 14:02:00 (MST-7)
Location: HIGHLANDS RANCH
Magnitude: 1.50 
Reported by: Public

Hail in LINCOLN, COLORADO
From 11-JUN-23 21:30:00 to 11-JUN-23 21:30:00 (MST-7)
Location: LIMON
Magnitude: 1.00 
Reported by: Trained Spotter