Supercell Thunderstorms developed in a short line from southeast Nebraska into southwest Iowa during the late evening of June 19th.  The storms formed near a weak warm front that separated dew point temperatures in the lower 70s south of the boundary with slightly drier conditions to the north.  The storms produced mainly large hail and at least one tornado on the Iowa and Missouri Border north of Tarkio Missouri.   A little later that night another line formed along and a little south of Highway 30 from around Columbus into western Iowa.  These storms produced strong winds, a few large hail reports and a band of heavy rain of 2 to 3 inches.

Thunderstorm Wind in BURT, NEBRASKA
From 20-JUN-11 01:00:00 to 20-JUN-11 01:00:00 (CST-6)
Location: LYONS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm wind gusts estimated at around 60 mph blew down 2 large trees in the Lyons city park.

Thunderstorm Wind in BUTLER, NEBRASKA
From 20-JUN-11 01:30:00 to 20-JUN-11 01:30:00 (CST-6)
Location: BELLWOOD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm wind gusts were estimated at around 60 mph in the Bellwood area.

Heavy Rain in DODGE, NEBRASKA
From 20-JUN-11 03:52:00 to 20-JUN-11 03:52:00 (CST-6)
Location: SCRIBNER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall of a little over 3 inches was reported in the Scribner area.  The rain fell in a several hour period and produced flooding along sections of Maple Creek later that day.

Thunderstorm Wind in LANCASTER, NEBRASKA
From 20-JUN-11 04:01:00 to 20-JUN-11 04:01:00 (CST-6)
Location: (LNK)LINCOLN ARPT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A decaying thunderstorm produced a 63 mph wind gust at the Lincoln airport.

Flood in DODGE, NEBRASKA
From 20-JUN-11 09:00:00 to 21-JUN-11 01:00:00 (CST-6)
Location: RIDGELEY
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

A line of heavy rain producing thunderstorms dropped 2 to 3 inches of rain across the Maple Creek basing during the early morning hours of 6/20.  The heavy rain caused Maple Creek to flood farm fields and a few county roads later that day, especially near and west of Nickerson where the creek climbed about a foot above its 10 foot flood stage.

Hail in OTOE, NEBRASKA
From 19-JUN-11 20:38:00 to 19-JUN-11 20:38:00 (CST-6)
Location: NEBRASKA CITY ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

From the first of at least 2 supercell thunderstorms that tracked across the town this night.

Hail in CASS, NEBRASKA
From 19-JUN-11 21:15:00 to 19-JUN-11 21:15:00 (CST-6)
Location: EAGLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OTOE, NEBRASKA
From 19-JUN-11 21:00:00 to 19-JUN-11 21:15:00 (CST-6)
Location: NEBRASKA CITY ARPT
Magnitude: 2.50 
Reported by: Public

Hail up to 2.5 inches in diameter fell for about 15 minutes from the second supercell thunderstorm that moved across the Nebraska City area this night.

Hail in OTOE, NEBRASKA
From 19-JUN-11 21:30:00 to 19-JUN-11 21:30:00 (CST-6)
Location: NEBRASKA CITY ARPT
Magnitude: 2.00 
Reported by: Trained Spotter

From the second or possibly third supercell thunderstorm that moved across the Nebraska City area this night.

Thunderstorm Wind in SEWARD, NEBRASKA
From 20-JUN-11 03:35:00 to 20-JUN-11 03:35:00 (CST-6)
Location: SEWARD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A decaying thunderstorm or outflow from a storm northwest of the region caused some tree damage in the Seward area including knocking down 4 large trees on the Concordia University campus.

Hail in CASS, NEBRASKA
From 19-JUN-11 22:32:00 to 19-JUN-11 22:32:00 (CST-6)
Location: UNION
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in SAUNDERS, NEBRASKA
From 19-JUN-11 23:14:00 to 19-JUN-11 23:14:00 (CST-6)
Location: ITHACA
Magnitude: 2.00 
Reported by: Law Enforcement

Hail up to 2 inches fell in the Ithaca area with some reports of sky lights broken because of the hail.

Thunderstorm Wind in DODGE, NEBRASKA
From 20-JUN-11 00:08:00 to 20-JUN-11 00:08:00 (CST-6)
Location: SCRIBNER ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm wind gusts estimated at 60 mph downed at least one tree onto power lines.  Six center pivots were flipped over in the region as well.

Hail in DOUGLAS, NEBRASKA
From 20-JUN-11 00:48:00 to 20-JUN-11 00:48:00 (CST-6)
Location: BOYS TOWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Around a mile northwest of Boystown.

Thunderstorm Wind in SAUNDERS, NEBRASKA
From 20-JUN-11 00:10:00 to 20-JUN-11 00:10:00 (CST-6)
Location: CEDAR BLUFFS
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated at over 60 mph downed tree limbs several inches in diameter south of Cedar Bluffs and destroyed a large metal building west of town.  Two center pivots in the area were also flipped.

Hail in BUTLER, NEBRASKA
From 20-JUN-11 01:35:00 to 20-JUN-11 01:35:00 (CST-6)
Location: BELLWOOD
Magnitude: 1.75 
Reported by: Fire Department/Rescue

Hail up to golf ball-size was accompanied by thunderstorm winds estimated at 60 mph.