If not for several weak landspout tornadoes that touched down near Fairmont in Fillmore County on this Sunday evening, this would have been a relatively low-key weather day for South Central Nebraska, featuring mainly just locally heavy rainfall across various parts of the area. However, this cluster of four landspouts (all rated EF-0) generated plenty of attention between 7-8 p.m. CDT as they descended intermittently and mostly-harmlessly into farm fields a few miles southeast through southwest of Fairmont. They were highly-visible, with some sightings occurring from 20+ miles away, and were also well-documented on video by a storm chaser. The parent storm remained nearly stationary over parts of northern Fillmore County for almost three hours, promoting an unofficial report of 3.77 of rain in Exeter, along with short-term street flooding and a brief round of quarter size hail. While other storms developed along and near the same frontal boundary during the evening, the only other severe weather report consisted of estimated 60 MPH winds west of Gresham.
For the majority of South Central Nebraska, localized heavy rain was the primary issue during the 24-hour period between the afternoon of the 24th and the afternoon of the 25th, with many locations tallying 1-3, and a few spots higher. A few of the highest official totals from NWS and CoCoRaHS observers featured: 4.50 near Rockville, 4.32 near Genoa and 3.80 near Gresham. However, totals over 3 were certainly the exception within the area as a whole, and there were few known flooding impacts.
Taking a closer look at the meteorological background behind the Fillmore County landspouts, the mesoscale environment appeared at least modestly-supportive of such activity. In the big picture of the mid-upper levels, forcing/lift was increasing as a well-defined shortwave trough approached from the Central High Plains. In the lower-levels, the key feature/focus was a weak, northeast-southwest oriented cold front aligned from central Kansas to eastern Nebraska, which the Fillmore County storm developed directly on. While deep-layer shear was fairly weak (around 20 knots), mixed-layer CAPE averaged 1000-2000 J/kg, promoting vigorous updrafts. More importantly for landspout formation, mesoscale analysis revealed a modest overlap of 0-3 kilometer (low level) CAPE and surface vorticity provided by the weak boundary.

Hail in FILLMORE, NEBRASKA
From 24-JUN-18 18:22:00 to 24-JUN-18 18:22:00 (CST-6)
Location: EXETER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Rain in FILLMORE, NEBRASKA
From 24-JUN-18 18:00:00 to 24-JUN-18 20:35:00 (CST-6)
Location: EXETER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A rainfall total of 3.77 inches occurred in Exeter. Street flooding was reported.

Heavy Rain in SHERMAN, NEBRASKA
From 24-JUN-18 07:00:00 to 25-JUN-18 07:00:00 (CST-6)
Location: ROCKVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A two-day rain total of 4.50 inches was reported two miles northwest of Rockville, with nearly all of this falling in a 24-hour period between the afternoon of the 24th and afternoon of the 25th.

Heavy Rain in NANCE, NEBRASKA
From 24-JUN-18 11:00:00 to 25-JUN-18 11:00:00 (CST-6)
Location: FULLERTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

A 24-hour rain total of 4.03 inches occurred three miles northwest of Fullerton. This report is from an automated gauge along the Cedar River.

Heavy Rain in NANCE, NEBRASKA
From 24-JUN-18 11:00:00 to 25-JUN-18 11:00:00 (CST-6)
Location: GENOA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A 24-hour rainfall total of 4.32 inches occurred two miles west of Genoa.

Heavy Rain in VALLEY, NEBRASKA
From 24-JUN-18 11:00:00 to 25-JUN-18 11:00:00 (CST-6)
Location: (ODX)SHARP FLD ORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A 24-hour rain total of 3.02 occurred at the Ord Airport. Most of the rain fell between 5 am and 8 am CDT.

Heavy Rain in YORK, NEBRASKA
From 24-JUN-18 12:55:00 to 25-JUN-18 12:55:00 (CST-6)
Location: GRESHAM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A 24-hour rainfall total of 3.80 inches occurred 4 miles west of Gresham, with a total of 3.04 inches of this occurring after 7 am CDT on June 25th.

Tornado in FILLMORE, NEBRASKA
From 24-JUN-18 18:43:00 to 24-JUN-18 18:50:00 (CST-6)
Location: FAIRMONT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak tornado occurred with a maximum wind speed of 65 mph. The tornado was a landspout in nature, and was one of four to occur within a few miles of Fairmont.

Tornado in FILLMORE, NEBRASKA
From 24-JUN-18 18:14:00 to 24-JUN-18 18:28:00 (CST-6)
Location: FAIRMONT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak tornado with a maximum wind speed of 65 mph occurred. The tornado was a landspout in nature, and was one of four to occur within a few miles of Fairmont.

Tornado in FILLMORE, NEBRASKA
From 24-JUN-18 18:12:00 to 24-JUN-18 18:13:00 (CST-6)
Location: FAIRMONT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak tornado with a maximum wind speed of 60 mph occurred. The tornado was a landspout in nature, and was one of four to occur within a few miles of Fairmont.

Tornado in FILLMORE, NEBRASKA
From 24-JUN-18 18:17:00 to 24-JUN-18 18:20:00 (CST-6)
Location: FAIRMONT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak tornado with a maximum wind speed of 60 mph occurred. The tornado was a landspout in nature, and was one of four to occur within a few miles of Fairmont.

Thunderstorm Wind in YORK, NEBRASKA
From 24-JUN-18 19:50:00 to 24-JUN-18 19:50:00 (CST-6)
Location: GRESHAM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated wind gust of 60 mph occurred along with pea size hail.