Multiple rounds of severe thunderstorms, mainly producing damaging winds and torrential rainfall, made for a very active Friday evening and early Saturday morning across much of South Central Nebraska. The initial wave of severe storms developed during the mid to late evening hours, mainly west of Highway 183 in the vicinity of a quasi-stationary surface front draped from Northwest Kansas to East Central Nebraska. With surface dewpoints pushing the low 70s in many areas, the airmass was quite unstable as storms organized, with MLCAPE values into the 3000-4000 J/kg range. A few of these initial storms were supercells, with one producing a brief EF0 tornado shortly after nightfall in central Gosper County with no damage reported.
As the initial cluster of storms pushed east toward the Highway 281 corridor toward midnight, wind damage became increasingly common. Southern Adams County was one of the hardest hit areas, with grain bins blown onto railroad tracks in Ayr, and signficant tree damage and some structural damage just north of Ayr at Crystal Lake. As this intial wave of storms weakened somewhat, another severe squall line surged into western sections of South Central Nebraska after midnight, aided by strong convergence along the nose of a 40-50 knot low level jet. With this line of late-night storms, damaging winds were not only reported along the leading edge of the outflow, but also in association with a wake low pressure system that developed behind the main squall line. These winds associated with the wake low pounded western Dawson County for several minutes, with reports of uprooted trees and damage to signs and a gazebo in Cozad. As the leading edge of the bowing squall line reached the Highway 281 corridor after 2 am, Adams County was again struck with damaging winds clocked as high as 73 MPH at the Hastings airport. Winds gusts in excess of 60 MPH also pressed east through the Aurora and York areas.
In addition to fairly widespread wind damage, portions of South Central Nebraska received heavy rainfall of 2 to 4 inches during the night. With the ground already saturated in areas mainly north of Interstate 80, flooding resulted. One of the most noteworthy flash flooding events affected the community of North Loup in Valley County along the Mira Creek. A dam break on the Bredthauer Dam, located approximately five miles northwest of town, allowed 1 to 2 feet of water to inundate much of North Loup on Saturday afternoon, with evacuations necessary.

Tornado in GOSPER, NEBRASKA
From 11-JUN-10 21:03:00 to 11-JUN-10 21:03:00 (CST-6)
Location: ELWOOD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported a brief tornado touchdown south of Elwood.

Thunderstorm Wind in PHELPS, NEBRASKA
From 11-JUN-10 21:38:00 to 11-JUN-10 21:38:00 (CST-6)
Location: ATLANTA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gust estimated at 60 mph.

Thunderstorm Wind in KEARNEY, NEBRASKA
From 11-JUN-10 22:20:00 to 11-JUN-10 22:20:00 (CST-6)
Location: MINDEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gust estimated at 60 mph.

Thunderstorm Wind in KEARNEY, NEBRASKA
From 11-JUN-10 22:28:00 to 11-JUN-10 22:28:00 (CST-6)
Location: HEARTWELL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gust estimated at 60 mph.

Thunderstorm Wind in ADAMS, NEBRASKA
From 11-JUN-10 22:40:00 to 11-JUN-10 22:40:00 (CST-6)
Location: ROSELAND
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A barn was destroyed east of town.

Thunderstorm Wind in ADAMS, NEBRASKA
From 11-JUN-10 22:30:00 to 11-JUN-10 22:30:00 (CST-6)
Location: HOLSTEIN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated at 70 mph caused power outages in town.

Thunderstorm Wind in ADAMS, NEBRASKA
From 11-JUN-10 22:40:00 to 11-JUN-10 22:48:00 (CST-6)
Location: AYR
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damage included grain bins being blown onto a railroad track at the elevator, as well as tree and garage damage near Crystal Lake.

Thunderstorm Wind in ADAMS, NEBRASKA
From 11-JUN-10 22:55:00 to 11-JUN-10 22:57:00 (CST-6)
Location: (HSI)HASTINGS ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in WEBSTER, NEBRASKA
From 11-JUN-10 23:11:00 to 11-JUN-10 23:11:00 (CST-6)
Location: INAVALE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated at 60 mph.

Thunderstorm Wind in HAMILTON, NEBRASKA
From 11-JUN-10 23:35:00 to 11-JUN-10 23:35:00 (CST-6)
Location: AURORA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Wind gusts estimated at 60 mph.

Thunderstorm Wind in DAWSON, NEBRASKA
From 12-JUN-10 00:38:00 to 12-JUN-10 00:38:00 (CST-6)
Location: COZAD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Damage was reported to signs and a gazebo, and tree limbs 4 to 8 inches in diameter were knocked down.

Thunderstorm Wind in PHELPS, NEBRASKA
From 12-JUN-10 00:39:00 to 12-JUN-10 00:39:00 (CST-6)
Location: FUNK
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DAWSON, NEBRASKA
From 12-JUN-10 00:46:00 to 12-JUN-10 00:47:00 (CST-6)
Location: COZAD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Grown trees uprooted in town and 14 to 16 inch tree limb knocked down.

Thunderstorm Wind in DAWSON, NEBRASKA
From 12-JUN-10 01:00:00 to 12-JUN-10 01:05:00 (CST-6)
Location: LEXINGTON ARPT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in ADAMS, NEBRASKA
From 12-JUN-10 01:21:00 to 12-JUN-10 01:21:00 (CST-6)
Location: (HSI)HASTINGS ARPT
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Two pivots were overturned near the airport.

Thunderstorm Wind in HAMILTON, NEBRASKA
From 12-JUN-10 01:49:00 to 12-JUN-10 01:49:00 (CST-6)
Location: AURORA MUNI ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in YORK, NEBRASKA
From 12-JUN-10 02:05:00 to 12-JUN-10 02:05:00 (CST-6)
Location: YORK
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in GREELEY, NEBRASKA
From 12-JUN-10 11:30:00 to 12-JUN-10 18:30:00 (CST-6)
Location: SCOTIA MUNI ARPT
Flood cause: Dam / Levee Break
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash Flood in VALLEY, NEBRASKA
From 12-JUN-10 11:30:00 to 12-JUN-10 18:30:00 (CST-6)
Location: NORTH LOUP
Flood cause: Dam / Levee Break
Property damage: 1.00M
Crop damage: 0.00K
Reported by: Emergency Manager