Severe thunderstorms produced heavy rain, large hail and damaging wind across parts of Boulder, Denver, Elbert, Larimer and Weld counties.  One tornado touched down briefly near Carr, but no damage was observed.  Hail up to half dollar size was observed, along with peak wind gusts around 60 mph.  Heavy rainfall, up to 3.64 inches,  produced flooding and flash flooding around Fort Collins and Livermore in Larimer County.  Vehicles were stuck in up to 3 feet of standing water.  Water from heavy rainfall filled the lagoon and surrounding retaining walls near the Lory Student Center on Colorado State University's main campus in Fort Collins.  At least four buildings on campus were damaged by floodwater, university officials said.  In the Cameron Peak burn area localized flash flooding was observed.  Buckhorn Road was impassable from 1 mile east of Moose Ridge Road to Forest Road 129.  In addition, multiple mudslides forced the closure of Highway 126 in Jefferson County.

Flash Flood in LARIMER, COLORADO
From 31-JUL-23 19:15:00 to 31-JUL-23 21:45:00 (MST-7)
Location: GLEN HAVEN
Flood cause: Heavy Rain / Burn Area
Property damage: 10.00K
Crop damage: 5.00K
Reported by: Emergency Manager

Buckhorn Road was impassable from 1 mile east of Moose Ridge Road to Forest Road 129.

Flash Flood in JEFFERSON, COLORADO
From 31-JUL-23 16:45:00 to 31-JUL-23 19:00:00 (MST-7)
Location: BUFFALO CREEK
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 10.00K
Reported by: State Official

Heavy rain produced multiple mudslides on and near Highway 126.  The roadway was closed until the debris could be cleared.

Hail in WELD, COLORADO
From 31-JUL-23 17:46:00 to 31-JUL-23 17:46:00 (MST-7)
Location: NUNN
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 31-JUL-23 17:55:00 to 31-JUL-23 17:55:00 (MST-7)
Location: FRANKTOWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BOULDER, COLORADO
From 31-JUL-23 17:57:00 to 31-JUL-23 17:57:00 (MST-7)
Location: SUPERIOR
Magnitude: 53.00 MG
Reported by: Mesonet

Thunderstorm Wind in ELBERT, COLORADO
From 31-JUL-23 17:57:00 to 31-JUL-23 17:57:00 (MST-7)
Location: ELIZABETH
Magnitude: 52.00 MG
Reported by: Mesonet

Hail in ELBERT, COLORADO
From 31-JUL-23 18:55:00 to 31-JUL-23 18:55:00 (MST-7)
Location: KIOWA
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in LARIMER, COLORADO
From 31-JUL-23 19:00:00 to 31-JUL-23 19:00:00 (MST-7)
Location: FT COLLINS
Magnitude: 1.25 
Reported by: Public

Tornado in WELD, COLORADO
From 31-JUL-23 16:46:00 to 31-JUL-23 16:47:00 (MST-7)
Location: ROCKPORT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A tornado touched down briefly in open country near Carr.  No damage was reported.

Flash Flood in LARIMER, COLORADO
From 31-JUL-23 18:45:00 to 31-JUL-23 20:30:00 (MST-7)
Location: FT COLLINS
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 25.00K
Reported by: Trained Spotter

Heavy rain produced localized flooding in downtown Fort Collins and Livermore, with standing water 1 to 3 feet deep.  Vehicles were reportedly floating at the intersection of College and Mulberry in Fort Collins.  Considerable street flooding was observed at several other locations.  Extensive flooding occurred on the CSU campus.  Trained spotter reported storm totals from 2.00 to 3.64 inches of rainfall.