A surface warm front extending west to east across northern Kansas the afternoon of September 9th slowly moved north into southeastern Nebraska and southwest Iowa. Surface based storms developed along and just north of this front, and quickly became supercellular. One HP supercell developed over Otoe county produced an EF1 tornado. Elevated storms formed during the afternoon well north of the surface boundary on the leading edge of an 850 mb front. This was ahead of a strong shortwave moving into the central plains. A moisture rich environment led to very heavy rain with several reports of flash flooding.

Hail in OTOE, NEBRASKA
From 09-SEP-14 15:26:00 to 09-SEP-14 15:26:00 (CST-6)
Location: NEBRASKA CITY ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in OTOE, NEBRASKA
From 09-SEP-14 15:37:00 to 09-SEP-14 15:37:00 (CST-6)
Location: NEBRASKA CITY ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in SEWARD, NEBRASKA
From 09-SEP-14 18:14:00 to 09-SEP-14 18:19:00 (CST-6)
Location: UTICA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail was also reported.

Thunderstorm Wind in DODGE, NEBRASKA
From 09-SEP-14 13:45:00 to 09-SEP-14 13:45:00 (CST-6)
Location: FREMONT ARPT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heavy Rain in DOUGLAS, NEBRASKA
From 09-SEP-14 14:15:00 to 09-SEP-14 15:15:00 (CST-6)
Location: (OMA)EPPLEY FLD OMAH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Heavy rain within the thunderstorm complex contributed to a new daily record 24 hour rainfall of 3.43 inches.

Tornado in OTOE, NEBRASKA
From 09-SEP-14 15:29:00 to 09-SEP-14 15:51:00 (CST-6)
Location: ELBERON
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 100.00K
Reported by: NWS Storm Survey

The tornado developed from a slow moving supercell across rural Otoe County. The tornado initially developed near County Road 50, and between County Road M and L. Initial damage was mainly to crops and snapped tree limbs. The slow-moving tornado traveled generally east southeast exhibiting a slightly erratic path through rural Otoe County. The tornado impacted a couple of farmsteads along  County Road 56, and also along County Road M. At these locations outbuildings were damaged or destroyed, as well as considerable tree damage. The tornado cross U.S. Highway 75 at the intersection of Nebraska Highway 128 where tree and power line damage occurred. The tornado continued east along Highway 128 continuing to do tree  and crop damage for 1 mile before dissipating.

Thunderstorm Wind in OTOE, NEBRASKA
From 09-SEP-14 15:25:00 to 09-SEP-14 15:42:00 (CST-6)
Location: ELBERON
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A storm survey of the track of the slow-moving Otoe County supercell revealed a swath of damage winds associated with the forward flank to the north of the tornado. This damage started just south of Nebraska Highway 2 about 3 miles east of Dunbar and continued east southeast across the south side of Nebraska and to the Missouri River. The damage consisted of flattened corn and broken or snapped tree limbs.

Flash Flood in DOUGLAS, NEBRASKA
From 09-SEP-14 14:15:00 to 09-SEP-14 15:15:00 (CST-6)
Location: MOORHEAD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Most of the Omaha metro area received anywhere from 3.00 to 3.50 inches with 1.50 to 2.00 inches in the southern parts of the metro area. Some reports of near 5.00 inches in the northern part of the county were reported. High water trapped vehicles in some Omaha areas, including under the bridge near Westroads Mall at West Dodge Road and Regency Parkway. When Omaha firefighters arrived, they spotted a minivan in nearly 3 feet of water. Firefighters helped a mother and three children from their vehicle. Other vehicles had to deal with flooding at 96th and Q Streets, 84th and Cass Streets and 90th and Burt Streets. Saddle Creek Road was flooded under the Dodge Street bridge. Runoff that overwhelmed the city's storm sewers caused manhole covers to pop off in several locations around the city.

Thunderstorm Wind in DOUGLAS, NEBRASKA
From 09-SEP-14 14:15:00 to 09-SEP-14 14:15:00 (CST-6)
Location: LANE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Sporadic tree damage was observed near the area of 180th and Center streets in Omaha.

Thunderstorm Wind in OTOE, NEBRASKA
From 09-SEP-14 15:30:00 to 09-SEP-14 15:48:00 (CST-6)
Location: LORTON
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A storm survey revealed a swath of damage winds to the south of the tornado track, likely associated with the rear-flank downdraft of the slow-moving Otoe County supercell. The damage was confined to flattened corn and broken or snapped tree limbs.