A weak upper-level disturbance tracked from the central High Plains through the mid Missouri Valley, encouraging the development of a surface low from southeast South Dakota into eastern Nebraska.  Meanwhile, an associated cold front progressed east into eastern Nebraska by afternoon with a stationary boundary extending from the surface low through southwest Iowa into northern Missouri. Severe thunderstorms developed during the late afternoon over eastern Nebraska and southwest Iowa along these surface features with activity merging into a bow-echo complex that subsequently tracked into northwest Missouri by late evening. Brief tornadoes occurred  with a supercell over Cass County, NE with intense, straight-line winds affecting the I-29 corridor in Fremont County, IA.

Hail in SARPY, NEBRASKA
From 11-JUN-18 16:00:00 to 11-JUN-18 16:00:00 (CST-6)
Location: GRETNA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Tornado in CASS, NEBRASKA
From 11-JUN-18 17:32:00 to 11-JUN-18 17:35:00 (CST-6)
Location: PLATTSMOUTH MUNI ARP
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado was a short, narrow area of damage between Louisville and Murray. Small and large tree limbs were down along the path.  This tornado was embedded within the widespread wind damage that occurred that day in Cass County.

Hail in PAWNEE, NEBRASKA
From 11-JUN-18 19:19:00 to 11-JUN-18 19:19:00 (CST-6)
Location: TABLE ROCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in CASS, NEBRASKA
From 11-JUN-18 16:40:00 to 11-JUN-18 16:41:00 (CST-6)
Location: LOUISVILLE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chasers spotted a cone shaped tornado that touched down briefly.

Thunderstorm Wind in OTOE, NEBRASKA
From 11-JUN-18 18:18:00 to 11-JUN-18 18:18:00 (CST-6)
Location: TALMAGE
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in SARPY, NEBRASKA
From 11-JUN-18 16:00:00 to 11-JUN-18 16:00:00 (CST-6)
Location: GRETNA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SARPY, NEBRASKA
From 11-JUN-18 16:00:00 to 11-JUN-18 16:00:00 (CST-6)
Location: GRETNA
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BURT, NEBRASKA
From 11-JUN-18 16:10:00 to 11-JUN-18 16:10:00 (CST-6)
Location: LYONS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in CASS, NEBRASKA
From 11-JUN-18 17:30:00 to 11-JUN-18 17:33:00 (CST-6)
Location: COLE ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado was reportedly touching down intermittently by a storm chaser.
It is embedded within the damaging thunderstorm wind area. A shed had metal panels taken off and a farm home had shingles removed.  Large limbs and trees were blown down in the path.

Hail in JOHNSON, NEBRASKA
From 11-JUN-18 18:16:00 to 11-JUN-18 18:16:00 (CST-6)
Location: STERLING
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JOHNSON, NEBRASKA
From 11-JUN-18 18:21:00 to 11-JUN-18 18:21:00 (CST-6)
Location: STERLING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JOHNSON, NEBRASKA
From 11-JUN-18 18:33:00 to 11-JUN-18 18:33:00 (CST-6)
Location: VESTA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CASS, NEBRASKA
From 11-JUN-18 16:30:00 to 11-JUN-18 18:30:00 (CST-6)
Location: LOUISVILLE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An extensive area of damaging thunderstorm winds extended from Louisville to north of Murray. The path of extensive downed trees, power lines and large limbs occurred in a swath in Cass County that was  16 miles long and 4-5 miles wide.  Winds up to 80 mph occurred from these storms. The damage started near Louisville, where there were many large trees blown down.  The damage was accentuated by hail up to 1 1/2 inches in diameter that broke numerous windows in homes in the city. Extensive damage occurred at Lake Wa Con-da where numerous power poles were blown down, trees down, and roof damage to homes occurred. Multiple trees were down in Cedar Creek with boats being torn away from their docks.

Hail in RICHARDSON, NEBRASKA
From 11-JUN-18 19:40:00 to 11-JUN-18 19:40:00 (CST-6)
Location: HUMBOLDT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CASS, NEBRASKA
From 11-JUN-18 18:05:00 to 11-JUN-18 18:05:00 (CST-6)
Location: UNION
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station measured an 80 mph gust 3 miles east of Union.

Hail in SARPY, NEBRASKA
From 11-JUN-18 16:04:00 to 11-JUN-18 16:04:00 (CST-6)
Location: CHALCO
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SARPY, NEBRASKA
From 11-JUN-18 16:10:00 to 11-JUN-18 16:10:00 (CST-6)
Location: CHALCO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CASS, NEBRASKA
From 11-JUN-18 16:25:00 to 11-JUN-18 16:25:00 (CST-6)
Location: MANLEY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in PAWNEE, NEBRASKA
From 11-JUN-18 19:05:00 to 11-JUN-18 19:06:00 (CST-6)
Location: STEINAUER
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A storm spotter reported and the NWS damage survey confirmed a brief tornado touchdown about 2.8 miles east of Steinhauer.  This was a brief touchdown in pastureland with some branches down from hardwood trees.

Hail in DODGE, NEBRASKA
From 11-JUN-18 16:30:00 to 11-JUN-18 16:30:00 (CST-6)
Location: FREMONT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in JOHNSON, NEBRASKA
From 11-JUN-18 18:35:00 to 11-JUN-18 18:35:00 (CST-6)
Location: COOK
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JOHNSON, NEBRASKA
From 11-JUN-18 18:45:00 to 11-JUN-18 18:45:00 (CST-6)
Location: TECUMSEH
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JOHNSON, NEBRASKA
From 11-JUN-18 19:13:00 to 11-JUN-18 19:13:00 (CST-6)
Location: ELK CREEK
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in PAWNEE, NEBRASKA
From 11-JUN-18 19:19:00 to 11-JUN-18 19:19:00 (CST-6)
Location: TABLE ROCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Funnel Cloud in NEMAHA, NEBRASKA
From 11-JUN-18 19:01:00 to 11-JUN-18 19:01:00 (CST-6)
Location: JOHNSON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in DODGE, NEBRASKA
From 11-JUN-18 16:36:00 to 11-JUN-18 16:36:00 (CST-6)
Location: FREMONT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in CASS, NEBRASKA
From 11-JUN-18 17:00:00 to 11-JUN-18 19:00:00 (CST-6)
Location: CEDAR CREEK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

There was flooding northeast of Cedar Creek .  Five feet of water was reported in a garage as well as flooding at the local baseball fields.

Hail in DOUGLAS, NEBRASKA
From 11-JUN-18 16:38:00 to 11-JUN-18 16:38:00 (CST-6)
Location: ELKHORN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CASS, NEBRASKA
From 11-JUN-18 17:34:00 to 11-JUN-18 17:34:00 (CST-6)
Location: SOUTH BEND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Hail in DODGE, NEBRASKA
From 11-JUN-18 16:29:00 to 11-JUN-18 16:29:00 (CST-6)
Location: FREMONT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Tornado in JOHNSON, NEBRASKA
From 11-JUN-18 19:00:00 to 11-JUN-18 19:02:00 (CST-6)
Location: ELK CREEK
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A short lived tornado that produced minor tree branch damage and was over a field for part of its path.  It traveled for less than a tenth of a mile moving west to east and was located 3 3/4 north northeast of Elk Creek.

Hail in JOHNSON, NEBRASKA
From 11-JUN-18 18:40:00 to 11-JUN-18 18:40:00 (CST-6)
Location: COOK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SARPY, NEBRASKA
From 11-JUN-18 17:10:00 to 11-JUN-18 17:10:00 (CST-6)
Location: RICHFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CASS, NEBRASKA
From 11-JUN-18 17:35:00 to 11-JUN-18 17:35:00 (CST-6)
Location: EAGLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CASS, NEBRASKA
From 11-JUN-18 17:41:00 to 11-JUN-18 17:41:00 (CST-6)
Location: ELMWOOD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JOHNSON, NEBRASKA
From 11-JUN-18 18:21:00 to 11-JUN-18 18:21:00 (CST-6)
Location: TECUMSEH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer