Isolated to scattered thunderstorm activity rumbled across mainly southwestern and far northern portions of South Central Nebraska on this Wednesday evening, resulting in a few instances of marginally severe hail and winds. The majority of ground-truth reports were from the Edison area of Furnas County, including nickel to ping pong ball size hail and estimated 60 MPH winds. Meanwhile, a completely separate, isolated storm to the north in Valley County dropped quarter size hail near Fort Hartsuff State Park.
Timing-wise, the first storms of the day to affect South Central Nebraska developed between 5-7 p.m. CDT, consisting of a smattering of non-severe multicells roaming mainly the far western counties of Dawson, Gosper and Furnas. During the next few hours this activity strengthened somewhat, yielding the aforementioned reports near Edison as it also gradually morphed into a rather compact, east-southeast propagating linear complex. Between 10 p.m. and midnight CDT, this storm complex drifted through mainly Harlan, Franklin and Webster counties before departing into far northern Kansas, likely producing gusty winds and small hail along the way but resulting in no additional severe-criteria reports. Farther north, the Valley County storm was severe only briefly, moving in out of Custer County around 9 p.m. CDT and weakening/dissipating within an hour.
Despite the occurrence of a few severe storms, this setup held the potential to be a bit more active than it turned out to be. However, factors working against more widespread severe weather ultimately outweighed the more favorable ones. More specifically, the coverage and intensity of severe storms was likely mitigated in part by: 1) rather warm air aloft and resultant capping, as evidenced by 700 millibar temperatures in the 13-16 C range...2) Fairly weak deep layer wind shear only around 30 knots. On the flip side, there was considerable instability to work with, as hot afternoon temperatures in the mid-upper 90s F combined with dewpoints well into the 60s to create mixed layer CAPE of 2000-4000 J/kg. At the surface, storms initiated along a north-south oriented trough axis stretched from central Nebraska into northwest Kansas.

Hail in FURNAS, NEBRASKA
From 21-JUN-17 19:30:00 to 21-JUN-17 19:38:00 (CST-6)
Location: EDISON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in FURNAS, NEBRASKA
From 21-JUN-17 19:35:00 to 21-JUN-17 19:35:00 (CST-6)
Location: EDISON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in VALLEY, NEBRASKA
From 21-JUN-17 20:40:00 to 21-JUN-17 20:40:00 (CST-6)
Location: ELYRIA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

NeRAIN observer reported quarter size hail.

Hail in FURNAS, NEBRASKA
From 21-JUN-17 20:42:00 to 21-JUN-17 20:44:00 (CST-6)
Location: EDISON
Magnitude: 1.50 
Property damage: 15.00K
Crop damage: 150.00K
Reported by: Fire Department/Rescue

Thunderstorm Wind in FURNAS, NEBRASKA
From 21-JUN-17 19:38:00 to 21-JUN-17 19:38:00 (CST-6)
Location: EDISON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated to be near 60 MPH.