A stalled out frontal boundary, combined with an approaching upper level trough of low pressure, led to the development of thunderstorms during the late afternoon hours of August 12th. Thunderstorm activity became better organized as it moved southeast into the central Nebraska Sandhills and portions of central Nebraska. Wind gusts estimated up to 100 MPH, along with very heavy rain and golf ball sized hail was reported.

Hail in CUSTER, NEBRASKA
From 12-AUG-17 17:53:00 to 12-AUG-17 17:53:00 (CST-6)
Location: ANSELMO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in CHERRY, NEBRASKA
From 12-AUG-17 17:40:00 to 12-AUG-17 17:40:00 (CST-6)
Location: BROWNLEE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BROWN, NEBRASKA
From 12-AUG-17 18:18:00 to 12-AUG-17 18:18:00 (CST-6)
Location: JOHNSTOWN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Flash Flood in CUSTER, NEBRASKA
From 12-AUG-17 20:00:00 to 12-AUG-17 20:00:00 (CST-6)
Location: BROKEN BOW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reports several roads in Broken Bow covered with 6+ inches of water.

Hail in CUSTER, NEBRASKA
From 12-AUG-17 19:21:00 to 12-AUG-17 19:21:00 (CST-6)
Location: BROKEN BOW
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CUSTER, NEBRASKA
From 12-AUG-17 19:21:00 to 12-AUG-17 19:21:00 (CST-6)
Location: BROKEN BOW
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated 80 MPH wind gusts at this location.

Hail in BROWN, NEBRASKA
From 12-AUG-17 18:56:00 to 12-AUG-17 18:56:00 (CST-6)
Location: AINSWORTH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in CUSTER, NEBRASKA
From 12-AUG-17 19:21:00 to 12-AUG-17 19:21:00 (CST-6)
Location: BROKEN BOW
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reports numerous damaged trees in Broken Bow.

Thunderstorm Wind in CUSTER, NEBRASKA
From 12-AUG-17 20:05:00 to 12-AUG-17 20:05:00 (CST-6)
Location: MASON CITY
Magnitude: 87.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A full center pivot irrigation system was flipped over south of Ansley. Time estimated from radar.

Flash Flood in LINCOLN, NEBRASKA
From 12-AUG-17 20:14:00 to 12-AUG-17 20:14:00 (CST-6)
Location: NORTH PLATTE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reports 3 to 4 inches of water running over State Farm Road, one mile east of highway 83.

Flash Flood in CUSTER, NEBRASKA
From 12-AUG-17 20:25:00 to 12-AUG-17 20:25:00 (CST-6)
Location: ANSELMO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported numerous roads and yards covered with water in Anselmo.

Hail in THOMAS, NEBRASKA
From 12-AUG-17 14:56:00 to 12-AUG-17 14:56:00 (CST-6)
Location: HALSEY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BLAINE, NEBRASKA
From 12-AUG-17 16:35:00 to 12-AUG-17 16:35:00 (CST-6)
Location: DUNNING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BLAINE, NEBRASKA
From 12-AUG-17 17:00:00 to 12-AUG-17 17:00:00 (CST-6)
Location: DUNNING
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public