Waves of rain and embedded thunderstorms progressed through South Central Nebraska during this Tuesday, followed by additional thunderstorms in the late afternoon and early evening. The waves of rain and embedded storms began moving in during the predawn hours and lasted through the day. By late afternoon, the rain had largely ended. However, scattered thunderstorms then erupted east of Highway 281. The storms were most concentrated along Highway 30 from Grand Island northeast to Columbus. Some limited severe weather occurred, with several reports of one inch hail over Thayer county. There was a single reported occurrence of one inch hail associated with the storms along Highway 30, near the town of Benedict. The main issue was excessive rainfall in this corridor. From 5:30 to 7:30 p.m. CDT storms repeatedly formed and trained. Thereafter, the line of storms sagged southeastward across Hamilton, Polk and York counties. Many observers measured three to nearly four inches of rain over Polk and York counties, much of which fell within a two to three hour period.
The flow aloft was zonal but exhibited a broad trough across the northern United States. An embedded shortwave trough was advancing through the Pacific Northwest. A suppressed subtropical high was over Texas. A strong surface cold front extended from eastern Canada across the Northern Plains and into the Northern Rockies. This front very slowly sagged southward into south central Nebraska during the day and exited to the south and east during the evening. Low-level winds of 30-40 knots south of the front (850 mb) advected very rich dewpoints, as high as +17C, northward into the front during the day. Precipitable water levels were around 2 inches and this was above the 99th percentile for the date for all the PW observations in the Omaha area since 1948. Because of the extensive rain and clouds, temperatures were suppressed and afternoon instability was modest, ranging from 500 J/kg of MLCAPE near Highway 30 to 1250 J/kg near the Kansas-Nebraska border. Deep layer shear ranged from 40-50 knots.

Hail in THAYER, NEBRASKA
From 09-SEP-14 16:06:00 to 09-SEP-14 16:06:00 (CST-6)
Location: CHESTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in THAYER, NEBRASKA
From 09-SEP-14 16:10:00 to 09-SEP-14 16:10:00 (CST-6)
Location: HUBBELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was accompanied by wind gusts near 60 MPH.

Hail in THAYER, NEBRASKA
From 09-SEP-14 16:33:00 to 09-SEP-14 16:33:00 (CST-6)
Location: GILEAD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YORK, NEBRASKA
From 09-SEP-14 17:52:00 to 09-SEP-14 17:52:00 (CST-6)
Location: BENEDICT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy Rain in POLK, NEBRASKA
From 09-SEP-14 12:00:00 to 10-SEP-14 06:00:00 (CST-6)
Location: SHELBY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Storm total rainfall of 3.18 inches was reported, most falling between 6-9 p.m.

Hail in YORK, NEBRASKA
From 09-SEP-14 18:02:00 to 09-SEP-14 18:02:00 (CST-6)
Location: GRESHAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy Rain in POLK, NEBRASKA
From 09-SEP-14 12:00:00 to 10-SEP-14 06:00:00 (CST-6)
Location: SHELBY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Storm total rainfall of 3.10 inches was reported, most falling between 6-9 p.m.

Heavy Rain in POLK, NEBRASKA
From 09-SEP-14 12:00:00 to 10-SEP-14 06:00:00 (CST-6)
Location: STROMSBURG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Storm total rainfall of 3.39 inches was reported, most falling between 6-9 p.m.

Heavy Rain in YORK, NEBRASKA
From 09-SEP-14 12:00:00 to 10-SEP-14 06:00:00 (CST-6)
Location: GRESHAM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Storm total rainfall of 3.26 inches was reported, most falling between 6-9 p.m.

Heavy Rain in POLK, NEBRASKA
From 09-SEP-14 12:00:00 to 10-SEP-14 06:00:00 (CST-6)
Location: OSCEOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Storm total rainfall of 3.87 inches was reported, most falling between 6-9 p.m.

Heavy Rain in YORK, NEBRASKA
From 09-SEP-14 12:00:00 to 10-SEP-14 06:00:00 (CST-6)
Location: GRESHAM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Storm total rainfall of 3.57 inches was reported, most falling between 6-9 p.m.

Heavy Rain in POLK, NEBRASKA
From 09-SEP-14 12:00:00 to 10-SEP-14 06:00:00 (CST-6)
Location: SHELBY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Storm total rainfall of 3.30 inches was reported, most falling between 6-9 p.m.

Thunderstorm Wind in THAYER, NEBRASKA
From 09-SEP-14 16:10:00 to 09-SEP-14 16:10:00 (CST-6)
Location: HUBBELL
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 500.00K
Reported by: Trained Spotter

Wind gusts were estimated to be near 60 MPH and were accompanied by quarter size hail.

Flood in POLK, NEBRASKA
From 09-SEP-14 19:00:00 to 09-SEP-14 23:00:00 (CST-6)
Location: OSCEOLA
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain in a small area upstream of Osceola resulted in the flooding of Davis Creek. A portion of Highway 81-92 approximately 1 mile west of town were covered in a few inches of water. Traffic was hindered, only one vehicle was allowed to pass at a time through this section. On the east side of town, where the highway crosses Davis Creek, water was covering part of the westbound lane.