As an upper level storm system moved into the northern Plains, a warm front retreated through eastern Nebraska and western Iowa during the afternoon. Unseasonably warm and humid air lifted into the region creating marginal instability by mid afternoon, but with the warm front in the area environmental shear was strong. Thunderstorms developed across northeast and east-central Nebraska by mid afternoon. Initially isolated supercells were the dominate mode with large hail the main threat. A small short-lived tornado did develop from one of the supercells in Washington County. Thunderstorms then moved into western Iowa as they continued to produce large hail. By mid evening the thunderstorms developed a common outflow in a west to east orientation and allowed for training, especially over northeast Nebraska. This continued regeneration of thunderstorms over the same area led to significant river and flash flooding over parts of the through the night.

Tornado in WASHINGTON, NEBRASKA
From 15-SEP-16 16:00:00 to 15-SEP-16 16:01:00 (CST-6)
Location: FT CALHOUN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser captured video of a brief tornado touchdown. Some small branches and some debris were noted in the area, but no significant damage occurred.

Hail in WASHINGTON, NEBRASKA
From 15-SEP-16 15:50:00 to 15-SEP-16 15:50:00 (CST-6)
Location: DE SOTO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in WASHINGTON, NEBRASKA
From 15-SEP-16 16:02:00 to 15-SEP-16 16:02:00 (CST-6)
Location: FT CALHOUN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in DODGE, NEBRASKA
From 15-SEP-16 17:25:00 to 15-SEP-16 17:25:00 (CST-6)
Location: UEHLING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DOUGLAS, NEBRASKA
From 15-SEP-16 15:14:00 to 15-SEP-16 15:14:00 (CST-6)
Location: BENNINGTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in WASHINGTON, NEBRASKA
From 15-SEP-16 15:24:00 to 15-SEP-16 15:24:00 (CST-6)
Location: WASHINGTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STANTON, NEBRASKA
From 15-SEP-16 16:05:00 to 15-SEP-16 16:05:00 (CST-6)
Location: PILGER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BURT, NEBRASKA
From 15-SEP-16 17:47:00 to 15-SEP-16 17:47:00 (CST-6)
Location: ARIZONA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STANTON, NEBRASKA
From 15-SEP-16 19:47:00 to 15-SEP-16 19:47:00 (CST-6)
Location: STANTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COLFAX, NEBRASKA
From 15-SEP-16 19:45:00 to 15-SEP-16 19:45:00 (CST-6)
Location: CLARKSON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in STANTON, NEBRASKA
From 15-SEP-16 18:59:00 to 15-SEP-16 21:00:00 (CST-6)
Location: STANTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported that water was flooding the eastbound lanes of Highway 32 and the roadway was closed.

Flash Flood in BURT, NEBRASKA
From 15-SEP-16 19:36:00 to 15-SEP-16 22:00:00 (CST-6)
Location: TEKAMAH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The local COOP observer indicated that water over roadways in town were reaching up to 2 feet deep.

Thunderstorm Wind in DOUGLAS, NEBRASKA
From 15-SEP-16 15:14:00 to 15-SEP-16 15:14:00 (CST-6)
Location: BENNINGTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The observer noted wind gusts to near 60 mph. Some small tree branches were noted down in the area.

Thunderstorm Wind in OTOE, NEBRASKA
From 16-SEP-16 00:25:00 to 16-SEP-16 00:25:00 (CST-6)
Location: NEBRASKA CITY ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A large tree was reported uprooted within the city of Nebraska City.

Flash Flood in COLFAX, NEBRASKA
From 16-SEP-16 08:27:00 to 16-SEP-16 10:30:00 (CST-6)
Location: LEIGH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager indicated that in excess of 6 inches of rainfall had fallen over the northern half of the county. This had inundated many county roadways, damaged several bridges and culverts.

Flash Flood in CUMING, NEBRASKA
From 16-SEP-16 08:27:00 to 16-SEP-16 10:27:00 (CST-6)
Location: BEEMER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager indicated that 4 to 6 inches of rainfall had led to inundation of several county roads.

Thunderstorm Wind in NEMAHA, NEBRASKA
From 16-SEP-16 00:00:00 to 16-SEP-16 00:00:00 (CST-6)
Location: BROCK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Farm outbuilding and corn cribs were reported damaged.

Flood in DODGE, NEBRASKA
From 16-SEP-16 22:46:00 to 17-SEP-16 12:04:00 (CST-6)
Location: NICKERSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rainfall caused the Maple Creek to go into moderate flooding. This created significant low-land flooding of agricultural areas along both bands of the creek, also county roads north of Nickerson, and flooded the US Highway 275 bridge closing the highway. The creek crested at 14.38 before quickly falling on the 17th.

Flood in DODGE, NEBRASKA
From 16-SEP-16 01:40:00 to 16-SEP-16 18:10:00 (CST-6)
Location: SCRIBNER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rainfall caused the Pebble Creek to rise into major flood near the town of Scribner. The flooding necessitated the closing of the flood gates that protect the town of Scribner, which also closes US Highway 275 through town. Outside of town significant low-land flooding was observed which closed numerous county roadways. The river crested at 22.35 ft before quickly falling on the 16t.

Flash Flood in PLATTE, NEBRASKA
From 16-SEP-16 08:27:00 to 16-SEP-16 10:30:00 (CST-6)
Location: PLATTE CENTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported that heavy rainfall in excess of 4 inches led to flooding of Central Highway.

Flash Flood in STANTON, NEBRASKA
From 16-SEP-16 08:27:00 to 16-SEP-16 09:30:00 (CST-6)
Location: PILGER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported that between 7 and 9 inches of rainfall fell around and south of the town of Pilger. This led to significant flash flooding inundating numerous county roadways, damaging or washing many of them out.

Flash Flood in BURT, NEBRASKA
From 15-SEP-16 18:32:00 to 15-SEP-16 20:32:00 (CST-6)
Location: OAKLAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported flooding of roadways in the area with at least 1 car stalled in the flood waters.

Flash Flood in CUMING, NEBRASKA
From 15-SEP-16 18:34:00 to 15-SEP-16 20:34:00 (CST-6)
Location: BEEMER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported flash flooding in Beemer with at least 8 inches of water over some roadways in town at the time.