In what had already been a very active start to June across parts of South Central Nebraska, what transpired on the afternoon of Wednesday the 10th into the early morning of Thursday the 11th was the final, truly widespread severe weather/flooding event of the month before a noticeably quieter weather pattern settled in over the next few weeks. Focusing first on the severe weather aspect, the afternoon and evening featured several reports of large hail and damaging winds within various counties. Storm mode was primarily multicell, some of which started out as semi-discrete before eventually merging into larger clusters and lines. Most hail reports were in the nickel to half dollar size range, with 1.25 diameter stones reported near Elwood and Lexington. However, one storm that tracked north of Lexington around 6 p.m. CDT was a prolific hail-producer, as a storm chaser reported a short stretch of Highway 21 completely hail-covered with most stones averaging golf ball size but one as large as 3 in diameter. As for damaging winds, there were primarily three noteworthy storms. First off, a cluster of severe storms shifted eastward into the Valley/Sherman counties area between 5:30-6:30 p.m. CDT. In Arcadia, the NWS cooperative observer estimated 70 MPH gusts, with 10-12 diameter tree limbs down. A bit later, a storm became severe near the Franklin/Kearney County line around 7 p.m. CDT and rapidly tracked northeast during the next few hours. Along the way, estimated 70 MPH winds overturned seven empty freight cars of a 72-car train near Kenesaw in extreme western Adams County. This storm weakened before reaching Grand Island, with only 50-60 MPH gusts reported on the south side of town around 8:30 p.m. CDT. While the train-toppling storm was in progress, a separate severe storm to its northeast passed through Merrick and northern Hamilton counties, causing tree and power line damage in Central City and Hordville around 8 p.m. CDT. By 9 p.m. CDT, storms had largely settled below severe-limits, with just one additional 60 MPH wind report along the Franklin/Webster County line. Through the remainder of the night, scattered to numerous showers and non-severe storms persisted over much of South Central Nebraska, with most counties finally rain-free by sunrise. As for rainfall amounts, the majority of the 24-county area totaled 1-2. However, there were a few smaller pockets of at least 2-3, most notably within York, northern Hamilton and southwestern Polk counties, where NeRAIN observers reported 3.46 near Hordville and 3.24 near Benedict.  Although a few dry days leading up to this event had allowed the York County area to start drying out in the wake of flooding rains that fell primarily on the 4th-5th, this event resulted in renewed short-term flooding issues. Most notably this involved the West Fork Big Blue River near McCool Junction, which again came out of its banks during the day on the 11th, only a few days after historic flooding occurred. Fortunately, flooding was not as severe this time around, and the river largely fell back into its banks by the end of the day on Friday the 12th (please refer to the June 4th p.m.-June 5th a.m. episode narrative for much more detail regarding multiple days of flooding along the West Fork Big Blue River).
Most of the timing details of this severe weather event were already covered in the preceding paragraph, as all hail/strong wind reports occurred between 4:00-9:30 p.m. CDT. However, the first strong storms of the afternoon actually developed eastward into the Dawson/Gosper counties area as early as 2:30-4:00 p.m. CDT. Turning to the synoptic and mesoscale setup: the primary trigger aloft was a series of fairly subtle disturbances gradually overspreading the Central Plains, out ahead of a modest shortwave trough drifting southeast toward the region from the Northern Rockies. At the surface, a few different boundaries helped to focus convection, including a generally west-to-east oriented quasi-stationary front draped through central Nebraska and also a trough axis extending southwest from the local area to weak low pressure centered near the KS/CO border. With afternoon temperatures rising between 90-95 degrees, storms erupted in an environment featuring around 2000 J/kg mixed-layer CAPE and 30-40 knots of 0-6 kilometer deep layer wind shear. During the night, widespread weak convection persisted within the exit region of a 30-40 knot low level jet.

Hail in DAWSON, NEBRASKA
From 10-JUN-15 16:37:00 to 10-JUN-15 16:37:00 (CST-6)
Location: LEXINGTON ARPT
Magnitude: 1.25 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in VALLEY, NEBRASKA
From 10-JUN-15 16:45:00 to 10-JUN-15 16:45:00 (CST-6)
Location: ARCADIA
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gusts estimated to be near 70 MPH resulted in large tree limbs being downed in Arcadia, some as large as 10-12 in diameter.

Hail in GOSPER, NEBRASKA
From 10-JUN-15 17:11:00 to 10-JUN-15 17:11:00 (CST-6)
Location: ELWOOD
Magnitude: 1.25 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ADAMS, NEBRASKA
From 10-JUN-15 18:42:00 to 10-JUN-15 18:42:00 (CST-6)
Location: KENESAW
Magnitude: 61.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Wind gusts estimated to be near 70 MPH resulted in the derailment of seven BNSF freight train cars in extreme western Adams County (the train had a total of 72 cars). Hail up to the size of nickels was also reported in the area.

Thunderstorm Wind in MERRICK, NEBRASKA
From 10-JUN-15 18:50:00 to 10-JUN-15 18:50:00 (CST-6)
Location: CENTRAL CITY
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated to be near 65 MPH resulted in some tree damage in Central City, with power line and pole damage also reported.

Thunderstorm Wind in HAMILTON, NEBRASKA
From 10-JUN-15 19:00:00 to 10-JUN-15 19:00:00 (CST-6)
Location: HORDVILLE
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be near 60 MPH resulted in tree limbs being downed.

Hail in DAWSON, NEBRASKA
From 10-JUN-15 15:15:00 to 10-JUN-15 15:15:00 (CST-6)
Location: FARNAM
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GOSPER, NEBRASKA
From 10-JUN-15 16:00:00 to 10-JUN-15 16:00:00 (CST-6)
Location: JOHNSON RES
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GOSPER, NEBRASKA
From 10-JUN-15 17:10:00 to 10-JUN-15 17:10:00 (CST-6)
Location: ELWOOD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GOSPER, NEBRASKA
From 10-JUN-15 17:06:00 to 10-JUN-15 17:06:00 (CST-6)
Location: ELWOOD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DAWSON, NEBRASKA
From 10-JUN-15 17:30:00 to 10-JUN-15 17:30:00 (CST-6)
Location: LEXINGTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GOSPER, NEBRASKA
From 10-JUN-15 17:31:00 to 10-JUN-15 17:31:00 (CST-6)
Location: JOHNSON RES
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in FRANKLIN, NEBRASKA
From 10-JUN-15 18:15:00 to 10-JUN-15 18:15:00 (CST-6)
Location: UPLAND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated to be near 60 MPH.

Thunderstorm Wind in KEARNEY, NEBRASKA
From 10-JUN-15 18:24:00 to 10-JUN-15 18:24:00 (CST-6)
Location: MINDEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Wind gusts were estimated to be near 60 MPH.

Thunderstorm Wind in HALL, NEBRASKA
From 10-JUN-15 19:37:00 to 10-JUN-15 19:37:00 (CST-6)
Location: GRAND IS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated to be near 60 MPH.

Thunderstorm Wind in WEBSTER, NEBRASKA
From 10-JUN-15 20:13:00 to 10-JUN-15 20:13:00 (CST-6)
Location: INAVALE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Wind gusts were estimated to be near 60 MPH near the Franklin and Webster County line along Highway 136.

Heavy Rain in HAMILTON, NEBRASKA
From 10-JUN-15 06:00:00 to 11-JUN-15 06:00:00 (CST-6)
Location: HORDVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A 24-hour rainfall total of 3.46...most of which fell on the evening of the 10th.

Heavy Rain in YORK, NEBRASKA
From 10-JUN-15 06:00:00 to 11-JUN-15 06:00:00 (CST-6)
Location: BENEDICT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A 24-hour rainfall total of 3.24...most of which fell on the evening of the 10th. Also within York County, 3.12 was reported six miles northeast of Waco.

Thunderstorm Wind in HALL, NEBRASKA
From 10-JUN-15 19:04:00 to 10-JUN-15 19:04:00 (CST-6)
Location: WOOD RIVER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated to be near 60 MPH.

Hail in DAWSON, NEBRASKA
From 10-JUN-15 17:00:00 to 10-JUN-15 17:08:00 (CST-6)
Location: LEXINGTON
Magnitude: 3.00 
Property damage: 100.00K
Crop damage: 500.00K
Reported by: Storm Chaser

A small stretch of Highway 21 was completely covered in hail. Most hail stones were near the size of golf balls, with some as large as 3 in diameter.