For the second consecutive night, thunderstorms were widespread across South Central Nebraska, pushing southeastward across the area mainly between 8 PM CDT Wednesday evening the 6th and 6 AM CDT early Thursday morning the 7th. Severe weather in the form of large hail or damaging winds was not an issue during this event, with only a few reports of sub-severe wind gusts. For most of the 24-county area, overnight rainfall totaled no more than 1-2 inches. However, considerably heavier rain and localized flooding materialized across a fairly concentrated zone north of Interstate 80, generally centered near the borders of Polk, York, Hamilton and Merrick Counties. Within this area, gauge readings of 3-5 inches were common, with an unofficial report of nearly 6 inches near the community of Polk. The majority of this heavy rain fell between midnight and 2 AM CDT, and resulted in flash flooding with water running over a small segment of Highway 66, and also covering several county roads. Although the initial flash flooding quickly receded, the net result of 3-6 inches of rain from separate events during the past 36 hours likely resulted in stream and river flooding for the next few days, especially along the Big Blue River basin in southern Polk County. A gauge along the Big Blue near Surprise, just east of the Polk-Butler County line, eventually exceeded flood stage by Saturday evening the 9th.
The expansive and rather slow-moving complex of storms that brought flooding rains during the night originated near the Nebraska-South Dakota border during the afternoon, gradually sinking southward within modest west-northwest flow aloft. The atmosphere was primed for heavy rain, with precipitable water values during the night averaging around 2 inches.

Heavy Rain in HAMILTON, NEBRASKA
From 06-JUL-11 07:00:00 to 07-JUL-11 07:00:00 (CST-6)
Location: HORDVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Total rainfall over the past 24 hours of 4.65 inches was reported by a Nebraska Rainfall Assessment and Information Network observer.

Heavy Rain in YORK, NEBRASKA
From 06-JUL-11 07:00:00 to 07-JUL-11 07:00:00 (CST-6)
Location: BRADSHAW
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Total rainfall over the past 24 hours of 3.72 inches was reported by a Nebraska Rainfall Assessment and Information Network observer.

Heavy Rain in MERRICK, NEBRASKA
From 06-JUL-11 07:00:00 to 07-JUL-11 07:00:00 (CST-6)
Location: CENTRAL CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Total rainfall over the past 24 hours of 3.64 inches was reported by a Nebraska Rainfall Assessment and Information Network observer.

Flash Flood in YORK, NEBRASKA
From 07-JUL-11 00:30:00 to 07-JUL-11 03:30:00 (CST-6)
Location: ARBORVILLE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 1.00M
Reported by: Emergency Manager

Early morning heavy rain resulted in reports of 3 to 5 inches across the area.  This heavy rain resulted in several county roads under water.

Flash Flood in HAMILTON, NEBRASKA
From 07-JUL-11 00:30:00 to 07-JUL-11 03:30:00 (CST-6)
Location: KRONBORG
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 1.00M
Reported by: Emergency Manager

Early morning heavy rain resulted in reports of 4 to 6 inches across the area.  This heavy rain caused water to run over a portion of Highway 66, and several county roads were under water.

Flash Flood in POLK, NEBRASKA
From 07-JUL-11 00:30:00 to 07-JUL-11 03:30:00 (CST-6)
Location: POLK
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 1.00M
Reported by: Emergency Manager

Early morning heavy rain resulted in reports of 5 to 6 inches across the area.  This heavy rain caused water to run over a portion of Highway 66, and several county roads were under water.