Severe thunderstorms produced extensive property and crop damage over portions of Logan County in and near Sterling; Sedgwick County, in and around Julesburg; and northern Washington Counties.  The severe thunderstorm near Sterling, produced a wind gust to 92 mph, golf ball sized hail and very heavy rain. The brunt of the storm passed just west of Sterling. Initial damage assessments estimated over 100 homes sustained moderate to heavy damage from the hail, mainly to roofs, windows and siding. Substantial damage from golf ball sized hail was reported to residences just west of Sterling as well as Sterling High School.  There was extensive tree damage, with large broken branches on the ground.  Trees in Pioneer Park were downed, including one with a 14-inch diameter trunk that was snapped by the straight-line winds.  Tree branches downed a few power lines around Sterling, causing localized power outages.  At the Sage Point Subdivision, approximately 150 residential windows were broken. There was also widespread vehicle damage.  An RV sales lot had trailers blown over into other trailers causing moderate damage.  Heavy rain also caused minor street and lowland flooding.

Hail in LOGAN, COLORADO
From 10-AUG-11 18:40:00 to 10-AUG-11 18:40:00 (MST-7)
Location: ACKERMAN
Magnitude: 1.75 
Reported by: Amateur Radio

Hail in LOGAN, COLORADO
From 10-AUG-11 16:33:00 to 10-AUG-11 16:33:00 (MST-7)
Location: STERLING ARPT
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in SEDGWICK, COLORADO
From 10-AUG-11 17:15:00 to 10-AUG-11 17:15:00 (MST-7)
Location: SEDGWICK
Magnitude: 1.75 
Reported by: Trained Spotter

Thunderstorm Wind in LOGAN, COLORADO
From 10-AUG-11 17:10:00 to 10-AUG-11 17:10:00 (MST-7)
Location: STERLING ARPT
Magnitude: 80.00 MG
Reported by: ASOS

Thunderstorm Wind in LOGAN, COLORADO
From 10-AUG-11 17:08:00 to 10-AUG-11 17:08:00 (MST-7)
Location: STERLING
Magnitude: 52.00 EG
Reported by: Trained Spotter

Damaging winds were reported at the Logan County Fairgrounds.

Thunderstorm Wind in LOGAN, COLORADO
From 10-AUG-11 17:22:00 to 10-AUG-11 17:22:00 (MST-7)
Location: STERLING
Magnitude: 52.00 EG
Reported by: Trained Spotter

Thunderstorm winds blew over a row of trailers and recreational vehicles at the Logan County Fairgrounds.

Hail in LOGAN, COLORADO
From 10-AUG-11 16:37:00 to 10-AUG-11 16:37:00 (MST-7)
Location: PADRONI
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 10-AUG-11 16:44:00 to 10-AUG-11 16:44:00 (MST-7)
Location: STERLING ARPT
Magnitude: 3.00 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 10-AUG-11 17:09:00 to 10-AUG-11 17:09:00 (MST-7)
Location: STERLING
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 10-AUG-11 17:10:00 to 10-AUG-11 17:10:00 (MST-7)
Location: STERLING
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 10-AUG-11 17:12:00 to 10-AUG-11 17:12:00 (MST-7)
Location: STERLING
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in SEDGWICK, COLORADO
From 10-AUG-11 17:14:00 to 10-AUG-11 17:14:00 (MST-7)
Location: JULESBURG
Magnitude: 1.50 
Reported by: State Official

Hail in LOGAN, COLORADO
From 10-AUG-11 17:14:00 to 10-AUG-11 17:14:00 (MST-7)
Location: ACKERMAN
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in WASHINGTON, COLORADO
From 10-AUG-11 17:51:00 to 10-AUG-11 17:51:00 (MST-7)
Location: AKRON GEBAUER ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in SEDGWICK, COLORADO
From 10-AUG-11 17:48:00 to 10-AUG-11 17:48:00 (MST-7)
Location: JULESBURG
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 10-AUG-11 17:42:00 to 10-AUG-11 17:42:00 (MST-7)
Location: FLEMING
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in SEDGWICK, COLORADO
From 10-AUG-11 17:15:00 to 10-AUG-11 17:15:00 (MST-7)
Location: JULESBURG
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in WASHINGTON, COLORADO
From 10-AUG-11 18:09:00 to 10-AUG-11 18:09:00 (MST-7)
Location: AKRON GEBAUER ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in SEDGWICK, COLORADO
From 10-AUG-11 17:20:00 to 10-AUG-11 17:20:00 (MST-7)
Location: JULESBURG
Magnitude: 1.50 
Reported by: Emergency Manager