Severe thunderstorms produced two tornadoes, along with damaging hail and straight-line winds.  Both tornadoes were assigned an EF2 rating.  One tornado snapped several power poles, while the other demolished a well constructed pole shed.  Very large hail, up to 3.25 inches in diameter in Logan County, damaged vehicles, homes, trees and crops.  The storms impacted parts of eastern Boulder, Logan, Phillips, Sedgwick and Weld counties.

Hail in WELD, COLORADO
From 11-SEP-19 16:10:00 to 11-SEP-19 16:10:00 (MST-7)
Location: GREELEY
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 16:12:00 to 11-SEP-19 16:12:00 (MST-7)
Location: GREELEY
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 16:17:00 to 11-SEP-19 16:17:00 (MST-7)
Location: GREELEY
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 16:20:00 to 11-SEP-19 16:20:00 (MST-7)
Location: GREELEY
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 16:06:00 to 11-SEP-19 16:06:00 (MST-7)
Location: GREELEY
Magnitude: 1.25 
Reported by: Public

Hail in BOULDER, COLORADO
From 11-SEP-19 15:30:00 to 11-SEP-19 15:30:00 (MST-7)
Location: LONGMONT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 11-SEP-19 15:34:00 to 11-SEP-19 15:34:00 (MST-7)
Location: LONGMONT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 11-SEP-19 15:37:00 to 11-SEP-19 15:37:00 (MST-7)
Location: LONGMONT
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 16:03:00 to 11-SEP-19 16:03:00 (MST-7)
Location: JOHNSTOWN
Magnitude: 1.00 
Reported by: Public

Hail in WELD, COLORADO
From 11-SEP-19 16:05:00 to 11-SEP-19 16:05:00 (MST-7)
Location: JOHNSTOWN
Magnitude: 1.25 
Reported by: Public

The hail shredded leaves, dented a car and damaged shingles.

Hail in LOGAN, COLORADO
From 11-SEP-19 17:58:00 to 11-SEP-19 17:58:00 (MST-7)
Location: STERLING
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 11-SEP-19 17:58:00 to 11-SEP-19 17:58:00 (MST-7)
Location: PADRONI
Magnitude: 2.50 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 11-SEP-19 18:00:00 to 11-SEP-19 18:00:00 (MST-7)
Location: STERLING
Magnitude: 2.75 
Reported by: Trained Spotter

In addition to large hail, wind gusts in excess of 60 mph were observed.

Hail in LOGAN, COLORADO
From 11-SEP-19 18:04:00 to 11-SEP-19 18:04:00 (MST-7)
Location: STERLING
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 11-SEP-19 18:12:00 to 11-SEP-19 18:12:00 (MST-7)
Location: LAFAYETTE
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 17:18:00 to 11-SEP-19 17:18:00 (MST-7)
Location: FIRESTONE
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 17:30:00 to 11-SEP-19 17:30:00 (MST-7)
Location: BUCKINGHAM
Magnitude: 2.75 
Reported by: Storm Chaser

Hail in WELD, COLORADO
From 11-SEP-19 17:30:00 to 11-SEP-19 17:30:00 (MST-7)
Location: NEW RAYMER
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 11-SEP-19 17:49:00 to 11-SEP-19 17:49:00 (MST-7)
Location: WILLARD
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 11-SEP-19 17:57:00 to 11-SEP-19 17:57:00 (MST-7)
Location: STERLING
Magnitude: 2.75 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 16:22:00 to 11-SEP-19 16:22:00 (MST-7)
Location: GREELEY
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 16:26:00 to 11-SEP-19 16:26:00 (MST-7)
Location: GREELEY
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 16:56:00 to 11-SEP-19 16:56:00 (MST-7)
Location: FIRESTONE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 16:57:00 to 11-SEP-19 16:57:00 (MST-7)
Location: FIRESTONE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 17:00:00 to 11-SEP-19 17:00:00 (MST-7)
Location: FIRESTONE
Magnitude: 1.00 
Reported by: NWS Employee

Hail in BOULDER, COLORADO
From 11-SEP-19 17:05:00 to 11-SEP-19 17:05:00 (MST-7)
Location: LOUISVILLE
Magnitude: 1.00 
Reported by: Amateur Radio

Hail in LOGAN, COLORADO
From 11-SEP-19 18:16:00 to 11-SEP-19 18:16:00 (MST-7)
Location: ILIFF
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in PHILLIPS, COLORADO
From 11-SEP-19 18:35:00 to 11-SEP-19 18:35:00 (MST-7)
Location: PAOLI
Magnitude: 2.50 
Reported by: Trained Spotter

The hail damaged broke several windows to a house and damaged vehicles.

Hail in PHILLIPS, COLORADO
From 11-SEP-19 18:56:00 to 11-SEP-19 18:56:00 (MST-7)
Location: AMHERST
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in PHILLIPS, COLORADO
From 11-SEP-19 19:00:00 to 11-SEP-19 19:00:00 (MST-7)
Location: AMHERST
Magnitude: 1.75 
Reported by: Trained Spotter

Hail broke a windshield.

Hail in SEDGWICK, COLORADO
From 11-SEP-19 19:08:00 to 11-SEP-19 19:08:00 (MST-7)
Location: JULESBURG
Magnitude: 1.75 
Reported by: Trained Spotter

Several windows at a home were broken.

Hail in BOULDER, COLORADO
From 11-SEP-19 17:10:00 to 11-SEP-19 17:10:00 (MST-7)
Location: LAFAYETTE
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 17:11:00 to 11-SEP-19 17:11:00 (MST-7)
Location: FIRESTONE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 17:13:00 to 11-SEP-19 17:13:00 (MST-7)
Location: ERIE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 11-SEP-19 17:14:00 to 11-SEP-19 17:14:00 (MST-7)
Location: ERIE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 11-SEP-19 17:17:00 to 11-SEP-19 17:17:00 (MST-7)
Location: WELDONA
Magnitude: 2.75 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 11-SEP-19 15:27:00 to 11-SEP-19 15:27:00 (MST-7)
Location: LONGMONT MUNI ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 11-SEP-19 15:27:00 to 11-SEP-19 15:27:00 (MST-7)
Location: LONGMONT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 11-SEP-19 15:28:00 to 11-SEP-19 15:28:00 (MST-7)
Location: LONGMONT
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in LOGAN, COLORADO
From 11-SEP-19 18:40:00 to 11-SEP-19 18:40:00 (MST-7)
Location: CROOK
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LOGAN, COLORADO
From 11-SEP-19 18:00:00 to 11-SEP-19 18:00:00 (MST-7)
Location: STERLING
Magnitude: 3.00 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 11-SEP-19 18:01:00 to 11-SEP-19 18:01:00 (MST-7)
Location: STERLING ARPT
Magnitude: 3.25 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 11-SEP-19 18:45:00 to 11-SEP-19 18:45:00 (MST-7)
Location: DAILEY
Magnitude: 3.00 
Reported by: Trained Spotter

Tornado in LOGAN, COLORADO
From 11-SEP-19 18:00:00 to 11-SEP-19 18:05:00 (MST-7)
Location: POWELL
Tornado F-scale: EF2
Reported by: NWS Storm Survey

A tornado touched down and demolished a pole barn.

Tornado in LOGAN, COLORADO
From 11-SEP-19 17:58:00 to 11-SEP-19 18:03:00 (MST-7)
Location: POWELL
Tornado F-scale: EF2
Reported by: NWS Storm Survey

A tornado touched down and snapped six power poles.