This Thursday afternoon and evening featured by far the most widespread severe weather and heavy rain event of the month within South Central Nebraska, although several northwestern counties hardly even saw a drop of rain as the majority of storms concentrated south of a line from Cambridge-Hastings-York along a slowly advancing cold front. Primarily between 4-9 PM CDT, several initially multicell and brief supercell storm structures gradually morphed into a quasi-linear forward-propagating mesoscale convective system (MCS) that eventually exited southeastward into Kansas. There were several reports of large hail from golf ball to tennis ball size, damaging wind gusts of 60-70 MPH and also localized flooding due to fairly widespread rainfall of 2-4 inches over a short time. A few of the most notable hail and wind reports included tennis ball size hail at Glenvil, golf ball size hail along with estimated 70 MPH winds in far southern Furnas County, estimated 70 MPH winds in Lawrence, and downed trees in the Alma and Orleans area. Rainfall and flooding-wise, the heaviest amounts of at least 3-4 inches targeted much of Clay, Fillmore, Nuckolls and Thayer Counties, along with southeastern Adams and far northeastern Webster Counties. Within this zone of heavy rain, the very highest amounts of 4 to over 4.50 inches focused along a narrow corridor from near Lawrence and Deweese to Clay Center, with numerous county roads reported under water in southern Clay County. During the ensuing 24 hours, flooding was reported along the Little Sandy Creek southeast of Clay Center, and the Little Blue River near Deweese crested at 9.7 feet, just short of the 10.0 ft. flood stage.
Breaking down event timing, the first few hours between 4-6 PM CDT featured severe storm development in two separate areas, with a western cluster focused over Furnas and Harlan Counties, while other severe storms erupted primarily over Clay and Adams Counties. During the next few hours through roughly 8 PM CDT, these two separate areas of severe storms congealed into a nearly solid line and started propagating southeast, with severe activity finally departing the local area out of Nuckolls and Thayer Counties by 9 PM CDT. Although additional storms lingered across much of South Central Nebraska through at least midnight CDT, none were severe. The primary low-level focus for this event was a slow-moving cold front stretched from northwest Kansas to northeast Nebraska at mid-afternoon. In the mid and upper levels, synoptic scale forcing was relatively weak, with the area positioned well south of a stronger shortwave swinging across southern Canada and the Dakotas. However, with surface dewpoints averaging 65-70F, convective instability was quite high with late afternoon mixed-layer CAPE climbing to at least 3000-4000 J/kg. On the other hand, 0-6 kilometer vertical wind shear was fairly weak at only around 30 knots, which combined with steering flow roughly parallel to the surface front to yield initially slow-moving, outflow dominant storms. Locally heavy rainfall was enhanced by precipitable water values averaging 1.3 to 1.8 inches.

Hail in FURNAS, NEBRASKA
From 14-JUN-12 15:47:00 to 14-JUN-12 15:47:00 (CST-6)
Location: WILSONVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in FURNAS, NEBRASKA
From 14-JUN-12 15:48:00 to 14-JUN-12 15:48:00 (CST-6)
Location: WILSONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CLAY, NEBRASKA
From 14-JUN-12 16:10:00 to 14-JUN-12 16:10:00 (CST-6)
Location: CLAY CENTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in FURNAS, NEBRASKA
From 14-JUN-12 16:10:00 to 14-JUN-12 16:25:00 (CST-6)
Location: WILSONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in FURNAS, NEBRASKA
From 14-JUN-12 16:14:00 to 14-JUN-12 16:14:00 (CST-6)
Location: WILSONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HARLAN, NEBRASKA
From 14-JUN-12 16:25:00 to 14-JUN-12 16:25:00 (CST-6)
Location: ORLEANS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ADAMS, NEBRASKA
From 14-JUN-12 16:43:00 to 14-JUN-12 16:53:00 (CST-6)
Location: HASTINGS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in FURNAS, NEBRASKA
From 14-JUN-12 17:03:00 to 14-JUN-12 17:03:00 (CST-6)
Location: BEAVER CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in CLAY, NEBRASKA
From 14-JUN-12 17:07:00 to 14-JUN-12 17:07:00 (CST-6)
Location: GLENVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts of 45 mph occurred along with the hail.

Hail in ADAMS, NEBRASKA
From 14-JUN-12 17:10:00 to 14-JUN-12 17:10:00 (CST-6)
Location: HASTINGS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts up to 60 mph occurred along with the ping pong ball size hail on Showboat Road.

Heavy Rain in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: LAWRENCE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 4.66 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in CLAY, NEBRASKA
From 14-JUN-12 16:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: CLAY CENTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.45 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Hail in CLAY, NEBRASKA
From 14-JUN-12 15:51:00 to 14-JUN-12 15:51:00 (CST-6)
Location: HARVARD
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 1.00M
Reported by: Trained Spotter

Hail in FURNAS, NEBRASKA
From 14-JUN-12 15:57:00 to 14-JUN-12 15:57:00 (CST-6)
Location: WILSONVILLE
Magnitude: 1.50 
Property damage: 50.00K
Crop damage: 1.00M
Reported by: COOP Observer

Flash Flood in CLAY, NEBRASKA
From 14-JUN-12 16:53:00 to 15-JUN-12 00:45:00 (CST-6)
Location: GLENVILLE
Flood cause: Heavy Rain
Property damage: 8.00K
Crop damage: 250.00K
Reported by: Law Enforcement

Numerous county roads were under water across southern Clay County, mainly south of Highway 74. Flash flooding resulted in the closure of Johnson Road, with flash flooding also occurring near the intersection of Highway 6 and Road X.

Hail in THAYER, NEBRASKA
From 14-JUN-12 18:22:00 to 14-JUN-12 18:22:00 (CST-6)
Location: BRUNING
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 1.00M
Reported by: Trained Spotter

Hail in FRANKLIN, NEBRASKA
From 14-JUN-12 18:05:00 to 14-JUN-12 18:05:00 (CST-6)
Location: HILDRETH
Magnitude: 1.50 
Property damage: 25.00K
Crop damage: 750.00K
Reported by: Fire Department/Rescue

Thunderstorm Wind in WEBSTER, NEBRASKA
From 14-JUN-12 17:48:00 to 14-JUN-12 17:48:00 (CST-6)
Location: GUIDE ROCK
Magnitude: 52.00 EG
Property damage: 75.00K
Crop damage: 1.00M
Reported by: Trained Spotter

Thunderstorm wind gusts estmated at 60 mph occurred along with golf ball size hail. Very heavy rain was also occurring.

Hail in CLAY, NEBRASKA
From 14-JUN-12 17:14:00 to 14-JUN-12 17:14:00 (CST-6)
Location: GLENVILLE
Magnitude: 2.50 
Property damage: 100.00K
Crop damage: 1.00M
Reported by: Trained Spotter

Hail in FURNAS, NEBRASKA
From 14-JUN-12 16:57:00 to 14-JUN-12 16:57:00 (CST-6)
Location: BEAVER CITY
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 750.00K
Reported by: Storm Chaser

Hail in WEBSTER, NEBRASKA
From 14-JUN-12 17:48:00 to 14-JUN-12 17:48:00 (CST-6)
Location: GUIDE ROCK
Magnitude: 1.75 
Property damage: 25.00K
Crop damage: 500.00K
Reported by: Trained Spotter

Estimated wind gusts of 60 mph occurred along with the golf ball size hail. The golf ball size hail was ongoing at the time of this report. Very heavy rainfall was also occurring.

Thunderstorm Wind in HARLAN, NEBRASKA
From 14-JUN-12 17:55:00 to 14-JUN-12 17:55:00 (CST-6)
Location: ALMA
Magnitude: 52.00 EG
Property damage: 15.00K
Reported by: Law Enforcement

Wind gusts estimated at 60 mph knocked down several trees.

Hail in CLAY, NEBRASKA
From 14-JUN-12 17:35:00 to 14-JUN-12 17:43:00 (CST-6)
Location: CLAY CENTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Estimated wind gusts of 50 mph were occurring with the hail.

Thunderstorm Wind in HARLAN, NEBRASKA
From 14-JUN-12 17:27:00 to 14-JUN-12 17:27:00 (CST-6)
Location: OXFORD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A thunderstorm wind gust of 60 mph was reported by the local fire department.

Thunderstorm Wind in CLAY, NEBRASKA
From 14-JUN-12 17:30:00 to 14-JUN-12 17:30:00 (CST-6)
Location: EDGAR
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Thunderstorm Wind in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:32:00 to 14-JUN-12 17:32:00 (CST-6)
Location: LAWRENCE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A 70 mph wind gust was reported by the Lawrence Fire Department.

Thunderstorm Wind in THAYER, NEBRASKA
From 14-JUN-12 18:40:00 to 14-JUN-12 18:40:00 (CST-6)
Location: CHESTER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 60 mph wind gust was reported from the general public.

Heavy Rain in CLAY, NEBRASKA
From 14-JUN-12 15:40:00 to 14-JUN-12 18:50:00 (CST-6)
Location: DEWEESE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rain began at about 440 pm CDT. A rain total of 3.00 inches occurred with heavy rain ongoing at the time of this report at 750 CDT.

Heavy Rain in CLAY, NEBRASKA
From 14-JUN-12 16:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: CLAY CENTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain total of 3.18 inches for the past 24 hours. The rain began approximately at 5 pm CDT on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in CLAY, NEBRASKA
From 14-JUN-12 16:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: CLAY CENTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain total of 4.33 inches for the past 24 hours. The rain began approximately at 5 pm CDT on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in THAYER, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: BRUNING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain total of 3.40 inches for the past 24 hours. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in CLAY, NEBRASKA
From 14-JUN-12 16:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: DEWEESE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 4.50 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in THAYER, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: DESHLER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.23 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: LAWRENCE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.16 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in ADAMS, NEBRASKA
From 14-JUN-12 16:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: AYR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.16 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network.  The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in THAYER, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: BYRON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.25 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: NELSON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.08 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: ANGUS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.08 inches over the past 24 hours. Report from the Nebraska Rainfall Assessment and Information Network.  The rain began during the early evening on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: LAWRENCE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 4.40 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: BOSTWICK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.33 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: NELSON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain total of 3.28 of inches for the past 24 hours. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Thunderstorm Wind in FURNAS, NEBRASKA
From 14-JUN-12 16:57:00 to 14-JUN-12 16:57:00 (CST-6)
Location: BEAVER CITY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Wind gusts were estimated at 70 mph.

Thunderstorm Wind in FURNAS, NEBRASKA
From 14-JUN-12 17:03:00 to 14-JUN-12 17:03:00 (CST-6)
Location: BEAVER CITY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail the size of golf balls fell along with estimated wind gusts of 70 mph.

Heavy Rain in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: SUPERIOR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.07 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Heavy Rain in NUCKOLLS, NEBRASKA
From 14-JUN-12 17:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: ANGUS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 4.37 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Thunderstorm Wind in HARLAN, NEBRASKA
From 14-JUN-12 17:48:00 to 14-JUN-12 17:48:00 (CST-6)
Location: ORLEANS
Magnitude: 52.00 EG
Property damage: 15.00K
Reported by: Law Enforcement

Wind gusts estimated at 60 mph resulted in downed trees along with power outages.

Heavy Rain in CLAY, NEBRASKA
From 14-JUN-12 16:00:00 to 15-JUN-12 07:00:00 (CST-6)
Location: FAIRFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rain total of 3.20 inches for the past 24 hours. Report comes from the Nebraska Rainfall Assessment and Information Network. The rain began during the late afternoon on June 14th, with the last round of rain ending during the early morning hours of June 15th.

Hail in CLAY, NEBRASKA
From 14-JUN-12 17:32:00 to 14-JUN-12 17:32:00 (CST-6)
Location: DEWEESE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement