Especially for counties south of Interstate 80 in South Central Nebraska, June finished with an active Saturday afternoon and evening of severe storms. Things started off with two discrete supercells featuring intense, crop-damaging hail and a few brief tornadoes, followed a few hours later by a larger-scale squall line/linear mesoscale convective system (MCS) that yielded sporadic damaging winds and torrential rainfall. The two confirmed EF-0 tornadoes were spawned by the eastern supercell in southeastern Phelps County around 4 p.m. CDT and inflicted no evident damage. As for large hail, both supercells produced at least golf ball size stones, including reports from the Arapahoe, Loomis and Axtell and Minden areas. However, the western storm also featured a report of baseball size hail three miles southeast of Loomis (see below for more details regarding resultant crop damage). Turning to damaging winds, the aforementioned pair of supercells yielded a handful of measured and estimated reports, including 80 MPH near Axtell (measured by a storm spotter). A bit later and farther east, an evolving cluster of multicell storms with estimated 80 MPH winds brought isolated wind damage to a few rural residences in far eastern Clay County, including: destroyed carports and hog sheds, and a partially-removed garage roof. Later in the evening, the more expansive MCS that swept across all of South Central Nebraska from west-to-east yielded mostly sub-severe gusts of 45-55 MPH. However, a handful of severe-criteria gusts of at least 60-65 MPH occurred in both far western areas (near Cambridge) and also far eastern areas (Fillmore/Thayer counties). In the eastern area, a camper blew over near Hebron and a large tree fell on a home in Milligan.
When all was said and done, the overall-biggest severe weather impact from the day was likely the localized-but-extensive crop damage caused by the initial pair of supercells in the southwestern quadrant of South Central Nebraska. The western supercell, which tracked from north central Furnas County to central Phelps County mainly between 2:30-4:30 p.m. CDT was particularly impactful, as satellite imagery in the following days revealed a roughly 2-3 mile wide by 15+ mile long swath of near-complete crop destruction. While not the main story, locally heavy rainfall and mainly minor/short-term flooding also occurred, with large portions of several counties receiving at least 1.50, much of which fell in a short time. The overall-heaviest rain into the 3-4range concentrated in two main zones: 1) parts of northern Furnas/southeastern Gosper and western Phelps counties, including 3.21 at Loomis...2) much of York, eastern Hamilton and southern Polk counties, including 4.09 near York and 3.26 near Stromsburg. In all three Tri Cities, the evening squall line produced brief-but-intense rainfall that prompted short-term street flooding, with reports of stalled vehicles in Kearney and the closure of the Burlington Avenue underpass in downtown Hastings.
Taking a closer look at the timing and evolution of convection, things got underway between 2-3 p.m. CDT as severe storms rapidly fired up over northern Furnas and Harlan counties. During the following few hours, these storms organized into the aforementioned pair of noteworthy classic supercells, with the western one eventually dissipating over Phelps County, while the eastern one marched across Kearney County and into western Adams County before weakening and merging into newly-developing multicell storms to its south and east. Between 5:30-7:30 p.m. CDT the main focus turned to a cluster of strong-to-severe multicells that expanded across eastern portions of the area, yielding mainly heavy rain and small hail, but also the eastern Clay County wind damage. As these storms exited stage right into eastern Nebraska, nearly all of South Central Nebraska had roughly an hour of storm-free conditions before attention turned back to the west as the leading edge of the north-south oriented squall line entered Dawson/Gosper/Furnas counties between 8:30-9:30 p.m. CDT. Over the next 2-3 hours, this mostly (but not entirely) sub-severe MCS swept through the remainder of the area, with the leading edge of strongest winds/heaviest rain exiting into eastern Nebraska shortly after midnight CDT.
Finishing with a look at the meteorological background and starting with the mid-upper levels, this was a fairly evident severe weather setup as a semi-potent shortwave trough (by early-summer standards) tracked from Wyoming into western Nebraska during the afternoon-evening. At the surface, a well-defined, west-southwest to east-northeast oriented frontal boundary stretched from northwest Kansas to southeast Nebraska throughout the day, with most of the local area residing just to its north in an environment characterized by easterly breezes, high temperatures in the 80s F and plentiful low-level moisture with dewpoints between the mid-60s and low-70s F. Deep-layer wind shear averaged around 40 knots throughout the event, with mixed-layer CAPE peaking 2000-3000 J/kg during the afternoon. While the late-afternoon and evening storms were well-anticipated, if anything was a bit of a forecast surprise it was the early formation of the pair of intense supercells, which could have posed a more dire tornado threat had they tracked directly along the surface front instead of generally 10-20 miles north of it.

Tornado in PHELPS, NEBRASKA
From 30-JUN-18 15:02:00 to 30-JUN-18 15:03:00 (CST-6)
Location: SACRAMENTO
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF0 with a maximum wind speed of 65 mph occurred.

Tornado in PHELPS, NEBRASKA
From 30-JUN-18 14:40:00 to 30-JUN-18 14:40:00 (CST-6)
Location: SACRAMENTO
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief touch down of a tornado occurred with maximum wind speeds of 65 mph.

Hail in CLAY, NEBRASKA
From 30-JUN-18 16:55:00 to 30-JUN-18 16:55:00 (CST-6)
Location: DEWEESE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YORK, NEBRASKA
From 30-JUN-18 17:44:00 to 30-JUN-18 17:44:00 (CST-6)
Location: HENDERSON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Report was via Facebook.

Hail in CLAY, NEBRASKA
From 30-JUN-18 17:15:00 to 30-JUN-18 17:23:00 (CST-6)
Location: DEWEESE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Nickel size hail fell along a swath from Deweese to Highway 14.

Thunderstorm Wind in FURNAS, NEBRASKA
From 30-JUN-18 14:06:00 to 30-JUN-18 14:06:00 (CST-6)
Location: ARAPAHOE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Three to four inch diameter tree branches were down, along with several street signs in downtown Arapahoe. Some street flooding occurred at the intersection of Highway 6 and 34.

Thunderstorm Wind in NUCKOLLS, NEBRASKA
From 30-JUN-18 17:45:00 to 30-JUN-18 17:45:00 (CST-6)
Location: OAK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Three inch diameter healthy tree limbs were down on Highway 4.

Thunderstorm Wind in FURNAS, NEBRASKA
From 30-JUN-18 13:56:00 to 30-JUN-18 13:56:00 (CST-6)
Location: ARAPAHOE
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in PHELPS, NEBRASKA
From 30-JUN-18 15:17:00 to 30-JUN-18 15:17:00 (CST-6)
Location: LOOMIS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Severe wind was estimated by a trained spotter.

Thunderstorm Wind in KEARNEY, NEBRASKA
From 30-JUN-18 15:27:00 to 30-JUN-18 15:27:00 (CST-6)
Location: AXTELL
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gust was measured on a portable anemometer.

Thunderstorm Wind in KEARNEY, NEBRASKA
From 30-JUN-18 16:24:00 to 30-JUN-18 16:24:00 (CST-6)
Location: NORMAN
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in FURNAS, NEBRASKA
From 30-JUN-18 20:20:00 to 30-JUN-18 20:20:00 (CST-6)
Location: CAMBRIDGE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PHELPS, NEBRASKA
From 30-JUN-18 14:44:00 to 30-JUN-18 14:44:00 (CST-6)
Location: SACRAMENTO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in FURNAS, NEBRASKA
From 30-JUN-18 13:56:00 to 30-JUN-18 13:56:00 (CST-6)
Location: ARAPAHOE
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An anemometer recorded a wind gust of 66 mph.

Thunderstorm Wind in FILLMORE, NEBRASKA
From 30-JUN-18 23:00:00 to 30-JUN-18 23:00:00 (CST-6)
Location: GENEVA
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A 60 mph wind gust was recorded three miles south of Geneva.

Thunderstorm Wind in THAYER, NEBRASKA
From 30-JUN-18 23:05:00 to 30-JUN-18 23:05:00 (CST-6)
Location: HEBRON ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

A 59 mph wind gust was measured at the Hebron Airport.

Thunderstorm Wind in FILLMORE, NEBRASKA
From 30-JUN-18 23:03:00 to 30-JUN-18 23:03:00 (CST-6)
Location: FAIRMONT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A 58 mph thunderstorm wind gust was recorded three miles northwest of Fairmont.

Thunderstorm Wind in FILLMORE, NEBRASKA
From 30-JUN-18 23:07:00 to 30-JUN-18 23:07:00 (CST-6)
Location: FAIRMONT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A 62 mph thunderstorm wind gust was recorded one mile east southeast of Fairmont.

Thunderstorm Wind in THAYER, NEBRASKA
From 30-JUN-18 23:06:00 to 30-JUN-18 23:06:00 (CST-6)
Location: HEBRON ARPT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A camper was blown over at the junction of Highways 136 and 81, southeast of Hebron.

Hail in FURNAS, NEBRASKA
From 30-JUN-18 13:40:00 to 30-JUN-18 13:46:00 (CST-6)
Location: ARAPAHOE
Magnitude: 1.75 
Property damage: 25.00K
Crop damage: 1.00M
Reported by: Public

Hail began with one inch diameter and grew to golf ball size.

Hail in FURNAS, NEBRASKA
From 30-JUN-18 13:53:00 to 30-JUN-18 14:13:00 (CST-6)
Location: ARAPAHOE
Magnitude: 1.75 
Property damage: 750.00K
Crop damage: 3.00M
Reported by: Fire Department/Rescue

Quarter to golf ball size hail fell for approximately 20 minutes. Heavy damage occurred from large hail. Several vehicles were damaged that included busted out windows. There was also damage to homes with substantial holes to siding. The crops south of town sustained a large amount of damage as well.

Hail in GOSPER, NEBRASKA
From 30-JUN-18 14:45:00 to 30-JUN-18 15:05:00 (CST-6)
Location: SMITHFIELD
Magnitude: 2.75 
Property damage: 250.00K
Crop damage: 4.00M
Reported by: NWS Storm Survey

Satellite imagery reveals a swath of what was presumably at least golf ball size hail and likely up to baseball size hail that stretched from extreme southeastern Gosper County to central Phelps County on the afternoon of June 30th. The path was about 2 to 3 miles wide.

Hail in PHELPS, NEBRASKA
From 30-JUN-18 15:00:00 to 30-JUN-18 15:45:00 (CST-6)
Location: LOOMIS
Magnitude: 2.75 
Property damage: 1.00M
Crop damage: 20.00M
Reported by: NWS Storm Survey

Satellite imagery reveals a swath of golf ball size to isolated baseball size hail that stretched from extreme southeastern Gosper County to central Phelps County on the afternoon of June 30th. The path was about 2 to 3 miles wide. Within this swath, law enforcement reported baseball size hail 3 miles southeast of Loomis at 3:12 p.m. CST.

Hail in KEARNEY, NEBRASKA
From 30-JUN-18 15:19:00 to 30-JUN-18 15:19:00 (CST-6)
Location: AXTELL
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 350.00K
Reported by: Trained Spotter

Hail in KEARNEY, NEBRASKA
From 30-JUN-18 15:53:00 to 30-JUN-18 15:53:00 (CST-6)
Location: AXTELL
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 350.00K
Reported by: Public

Hail in KEARNEY, NEBRASKA
From 30-JUN-18 16:06:00 to 30-JUN-18 16:06:00 (CST-6)
Location: MINDEN
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 350.00K
Reported by: Trained Spotter

Thunderstorm Wind in CLAY, NEBRASKA
From 30-JUN-18 17:30:00 to 30-JUN-18 17:30:00 (CST-6)
Location: ONG
Magnitude: 70.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damage occurred to a few homesteads about eight to nine miles south and about one mile west of Sutton. Two carports were destroyed, with one being blown out into a neighbor's field. Two hog sheds were badly damaged at another location. One home sustained roof damage. The roof of the garage was severely damaged and at least partially removed. Part of the roof was damaged where it met the garage and allowed heavy rain into the home. The observer noted that things were all blown in the same direction, indicating straight-line wind.

Thunderstorm Wind in FILLMORE, NEBRASKA
From 30-JUN-18 23:10:00 to 30-JUN-18 23:10:00 (CST-6)
Location: MILLIGAN
Magnitude: 56.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Social Media

A social media photo featured a large tree that fell on a home, causing roof damage.