Moist and unstable conditions that prevailed over eastern Nebraska during the afternoon and evening hours of August 15th helped set the stage for slow moving thunderstorms that repeatedly developed and tracked across parts of northeast Nebraska.  The storms were aided by an unseasonably strong upper level system that was tracking along the Montana/Canadian border.  The storms developed in a broken west to east line generally to the northwest through north of Columbus.  The storms were eventually overtaken around midnight by a larger and generally north to south line of thunderstorms that had developed earlier that day over the western high plains.  The storms in northeast Nebraska were mainly heavy rain producers, but a few possessed strong rotation and brought some hail and gusty winds.

Flash Flood in PIERCE, NEBRASKA
From 16-AUG-09 00:40:00 to 16-AUG-09 03:40:00 (CST-6)
Location: PIERCE
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain producing thunderstorms caused flash flooding across some county roads from around Pierce to near Plainview.  Besides washing the gravel off of a few county roads, some crops in low areas also sustained damage.   Pierce had 4.13 inches from the storm with 4.18 inches reported several miles south of Plainview.  The rain began falling during the late afternoon hours of the 15th and persisted a bit past midnight on the 16th.

Hail in KNOX, NEBRASKA
From 15-AUG-09 16:30:00 to 15-AUG-09 16:30:00 (CST-6)
Location: VERDEL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail at least nickel-size was reported near Verdel.

Flash Flood in ANTELOPE, NEBRASKA
From 16-AUG-09 00:00:00 to 16-AUG-09 04:00:00 (CST-6)
Location: NELIGH ARPT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Another round of heavy rain producing thunderstorms caused additional flash flooding across a few county roads from near Clearwater to around Brunswick.  Earlier in the evening over 3 inches of rain was reported around Clearwater and an additional inch or two of rain likely fell across the area either causing additional flooding or prolonging flooding that had already been occurring.   The flooding caused some crop and culvert damage and also washed gravel off of sections of county roads.

Flash Flood in MADISON, NEBRASKA
From 16-AUG-09 00:40:00 to 16-AUG-09 03:40:00 (CST-6)
Location: (OFK)STEFAN FLD NORF
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain, the heaviest of which fell west through southwest of Norfolk, caused flash flooding across a few county roads from near Battle Creek to south of Norfolk.  The water also covered one lane of Highway 81 south of Norfolk.  Damage was minimal and mainly consisted of some crop damage in low areas and some gravel washed off of county roads.  Rainfall was estimated to have at least been 2 to 4 inches over the much of the area based on surrounding reports and radar estimations.

Flash Flood in ANTELOPE, NEBRASKA
From 15-AUG-09 18:45:00 to 15-AUG-09 21:45:00 (CST-6)
Location: NELIGH ARPT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain caused ditches and culverts to run full or flood across a few county roads from near Clearwater to around Brunswick.  A trained weather spotter near Clearwater measured 3.25 inches of rain in a several hour period through 745 pm CDT and additional heavy rain fell after that time in the area.  Besides some crop damage in low areas, gravel was washed off a few county roads and a couple of culverts sustained damage.