Although the vast majority of South Central Nebraska avoided a fairly concentrated swath of large hail and damaging winds centered from northwest Nebraska into northern Missouri, the southern periphery of this activity clipped far northern parts of the area, primarily impacting Valley, Greeley and Nance Counties. Actually, this was a two-part severe weather event, with the first round of storms sliding across the northern counties on Sunday evening mainly between 5 and 7 PM CDT, and the second round tracking through almost the exact same area several hours later between 1130 PM and 1 AM early Monday morning.
The first round of storms was essentially the far southern extension of a maturing quasi-linear mesoscale convective system (MCS) that had been tracking across northern Nebraska for several hours before entering the local area. This line of storms resulted in quarter size hail in Greeley. After a multi-hour lull, the second round of severe storms entered Valley County around midnight as a small, but intense bowing multicell cluster. As with the first round, these storms had been approaching from northwest Nebraska for several hours. These storms also produced quarter size hail, with the combination of hail and gusty winds breaking a convenience store window in Ord. The dominant cell weakened considerably by the time it reached far northern Polk County, and although additional storms affected other parts of South Central Nebraska through the night, none of them became severe.
The synoptic scale environment was supportive of multiple clusters of storms tracking through the same region, as a strong mid-level shortwave trough tracked from the northern Rockies into the Dakotas. The enhanced mid-level flow along the southern reaches of this trough promoted strong deep-layer vertical wind shear around 50 knots. Instability-wise, most-unstable CAPE values through the evening hours averaged 2000-4000 J/kg. At the surface, South Central Nebraska was centered between a quasi-stationary front across northern Kansas, and an advancing cold front tracking southward into the area out of South Dakota. Warm mid-level air surging northward ahead of the surface cold front effectively capped off most of South Central Nebraska from a severe weather threat, limiting the areal impact.

Hail in VALLEY, NEBRASKA
From 26-JUN-11 22:50:00 to 26-JUN-11 22:50:00 (CST-6)
Location: ORD
Magnitude: 0.88 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: County Official

Hail was accompanied by 40 to 50 MPH wind gusts.  A window at a local convenience store was broken.

Hail in GREELEY, NEBRASKA
From 26-JUN-11 16:45:00 to 26-JUN-11 16:45:00 (CST-6)
Location: SPALDING
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GREELEY, NEBRASKA
From 26-JUN-11 16:45:00 to 26-JUN-11 16:45:00 (CST-6)
Location: GREELEY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GREELEY, NEBRASKA
From 26-JUN-11 17:05:00 to 26-JUN-11 17:05:00 (CST-6)
Location: GREELEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in VALLEY, NEBRASKA
From 26-JUN-11 22:54:00 to 26-JUN-11 22:54:00 (CST-6)
Location: ORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Hail in VALLEY, NEBRASKA
From 26-JUN-11 22:59:00 to 26-JUN-11 22:59:00 (CST-6)
Location: ORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Hail in NANCE, NEBRASKA
From 26-JUN-11 23:45:00 to 26-JUN-11 23:45:00 (CST-6)
Location: FULLERTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public