Severe thunderstorms with large hail developed across Adams, Boulder, Denver, Larimer, Morgan and Weld counties.  The hail ranged from 1.0 to 2.5 inches in diameter.  Extensive damage to homes and vehicles was reported in Longmont, Erie, Johnstown and Firestone.   The largest hail occurred in Morgan County, where tennis ball size hail was reported.

Hail in ADAMS, COLORADO
From 09-MAY-23 17:12:00 to 09-MAY-23 17:12:00 (MST-7)
Location: THORNTON
Magnitude: 1.00 
Reported by: Social Media

Hail in ADAMS, COLORADO
From 09-MAY-23 17:23:00 to 09-MAY-23 17:23:00 (MST-7)
Location: HENDERSON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DENVER, COLORADO
From 09-MAY-23 17:56:00 to 09-MAY-23 17:56:00 (MST-7)
Location: (DEN)DENVER INTL ARP
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 09-MAY-23 18:10:00 to 09-MAY-23 18:10:00 (MST-7)
Location: BRIGHTON
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 09-MAY-23 18:23:00 to 09-MAY-23 18:23:00 (MST-7)
Location: BRIGHTON
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 09-MAY-23 18:35:00 to 09-MAY-23 18:35:00 (MST-7)
Location: BARR LAKE
Magnitude: 1.75 
Reported by: Social Media

Hail in LARIMER, COLORADO
From 09-MAY-23 18:55:00 to 09-MAY-23 18:55:00 (MST-7)
Location: TIMNATH
Magnitude: 1.00 
Reported by: Social Media

Hail in MORGAN, COLORADO
From 09-MAY-23 20:50:00 to 09-MAY-23 20:50:00 (MST-7)
Location: HOYT
Magnitude: 2.50 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 09-MAY-23 21:38:00 to 09-MAY-23 21:38:00 (MST-7)
Location: NIWOT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 09-MAY-23 21:45:00 to 09-MAY-23 21:45:00 (MST-7)
Location: LONGMONT
Magnitude: 1.00 
Reported by: CoCoRaHS

Hail in BOULDER, COLORADO
From 09-MAY-23 21:51:00 to 09-MAY-23 21:51:00 (MST-7)
Location: LONGMONT
Magnitude: 1.75 
Reported by: Public

Hail in WELD, COLORADO
From 09-MAY-23 22:10:00 to 09-MAY-23 22:10:00 (MST-7)
Location: ERIE
Magnitude: 1.50 
Reported by: Trained Spotter

Large hail smashed the windshield and the rear window of a vehicle.  The roof of a home was damaged and leaves were stripped off trees.

Hail in WELD, COLORADO
From 09-MAY-23 23:02:00 to 09-MAY-23 23:02:00 (MST-7)
Location: FIRESTONE
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 09-MAY-23 21:35:00 to 09-MAY-23 21:35:00 (MST-7)
Location: LONGMONT MUNI ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 09-MAY-23 22:10:00 to 09-MAY-23 22:10:00 (MST-7)
Location: ERIE
Magnitude: 1.50 
Reported by: Social Media

Hail in WELD, COLORADO
From 09-MAY-23 22:10:00 to 09-MAY-23 22:10:00 (MST-7)
Location: ERIE
Magnitude: 1.75 
Reported by: NWS Employee

Hail in WELD, COLORADO
From 09-MAY-23 22:18:00 to 09-MAY-23 22:18:00 (MST-7)
Location: FREDERICK
Magnitude: 2.00 
Reported by: Public

Hail in WELD, COLORADO
From 09-MAY-23 22:20:00 to 09-MAY-23 22:20:00 (MST-7)
Location: ERIE
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 09-MAY-23 22:20:00 to 09-MAY-23 22:20:00 (MST-7)
Location: FIRESTONE
Magnitude: 1.25 
Reported by: NWS Employee

Hail in WELD, COLORADO
From 09-MAY-23 22:33:00 to 09-MAY-23 22:33:00 (MST-7)
Location: FIRESTONE
Magnitude: 2.00 
Reported by: NWS Employee

Hail in WELD, COLORADO
From 09-MAY-23 22:50:00 to 09-MAY-23 22:50:00 (MST-7)
Location: ERIE
Magnitude: 1.75 
Reported by: Social Media

Large hail broke car windows.