An area of thunderstorms, including a few supercells, developed along a cold front that was pushing into eastern Nebraska and also along a weak warm front that extended just ahead of the cold front.  The storms were fed by a very strong low level jet that increased in intensity and helped create the wind shear favorable for the supercells, including one which produced a short-lived tornado in Johnson, Nebraska.  The storms also produced a small area of very heavy rain.  Virginia in Gage county reported around 4 inches with a little over 2 inches reported in Tecumseh which is in Johnson county.  The heavy rain produced isolated flash flooding and river flooding.
This weather system eventually produced 3 to 8 inches or more of heavy wet snow on April 25th from northern Nebraska into North Dakota and western Minnesota.  Freezing rain was also reported over sections of eastern South Dakota from this storm.

Hail in GAGE, NEBRASKA
From 24-APR-08 22:15:00 to 24-APR-08 22:15:00 (CST-6)
Location: BEATRICE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in OTOE, NEBRASKA
From 24-APR-08 23:59:00 to 25-APR-08 00:20:00 (CST-6)
Location: PAUL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail up to 1 inch in diameter fell for around 20 minutes 8 miles south of Nebraska City.

Hail in PAWNEE, NEBRASKA
From 25-APR-08 01:15:00 to 25-APR-08 01:15:00 (CST-6)
Location: PAWNEE CITY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The time was estimated.

Hail in GAGE, NEBRASKA
From 25-APR-08 00:53:00 to 25-APR-08 00:53:00 (CST-6)
Location: BARNESTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Reported 6 miles south of Wymore.

Flood in GAGE, NEBRASKA
From 25-APR-08 09:15:00 to 25-APR-08 13:15:00 (CST-6)
Location: BARNESTON
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Rainfall of 2 to 4 inches over a several hour period across a section of the lower Big Blue River basin in southeast Nebraska caused the Big Blue River near Barneston to flood.  The river near Barneston reached 20.8 feet at 1115 am CDT on April 25th, flood stage is 20 feet.  The river was above flood stage near Barneston from around 1015 am through 215 pm.  The flooding caused some road and culvert damage in addition to flooding agricultural lowlands.

Hail in GAGE, NEBRASKA
From 24-APR-08 23:00:00 to 24-APR-08 23:00:00 (CST-6)
Location: VIRGINIA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JOHNSON, NEBRASKA
From 24-APR-08 23:00:00 to 24-APR-08 23:00:00 (CST-6)
Location: TECUMSEH
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in RICHARDSON, NEBRASKA
From 25-APR-08 01:35:00 to 25-APR-08 01:35:00 (CST-6)
Location: HUMBOLDT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The time was estimated.

Hail in JOHNSON, NEBRASKA
From 24-APR-08 23:40:00 to 24-APR-08 23:40:00 (CST-6)
Location: TECUMSEH
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in JEFFERSON, NEBRASKA
From 24-APR-08 23:14:00 to 24-APR-08 23:14:00 (CST-6)
Location: STEELE CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in JEFFERSON, NEBRASKA
From 25-APR-08 00:05:00 to 25-APR-08 00:05:00 (CST-6)
Location: FAIRBURY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in NEMAHA, NEBRASKA
From 24-APR-08 23:50:00 to 24-APR-08 23:53:00 (CST-6)
Location: JOHNSON
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down on the southwest edge of Johnson near Chestnut and 1st Streets.  The tornado moved northeast across town causing EF1 damage to several buildings in downtown Johnson along Main Street between 2nd and 3rd Streets.  The tornado weakened as it approached the high school and then lifted around Walnut and 5th Streets.
Roofing material and the facade of several buildings were peeled or collapsed.  Hardwood and softwood trees were snapped along the path and 2 garages were pushed off of their foundations.  A building next to the fire station also had a large garage door blown in.  No injuries were reported.

Flash Flood in GAGE, NEBRASKA
From 25-APR-08 00:20:00 to 25-APR-08 03:20:00 (CST-6)
Location: BLUE SPGS
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain caused flash flooding across River Drive south of Blue Springs.  The flooding was the result of 2 to 4 inches of rain that fell from thunderstorms that night and produced some washed-out roads and damage to some culverts.  A bridge in the area was closed for several hours.

Hail in GAGE, NEBRASKA
From 24-APR-08 21:57:00 to 24-APR-08 21:57:00 (CST-6)
Location: ODELL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GAGE, NEBRASKA
From 24-APR-08 22:03:00 to 24-APR-08 22:03:00 (CST-6)
Location: ODELL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flood in JOHNSON, NEBRASKA
From 25-APR-08 04:00:00 to 25-APR-08 14:00:00 (CST-6)
Location: VESTA
Flood cause: Heavy Rain
Property damage: 1.00M
Crop damage: 0.00K
Reported by: Emergency Manager

Rainfall of 2 to 6 inches in a few hours time caused flooding along Sampson Creek and Turkey Creek which washed out 3 bridges and caused county road damage southwest of Tecumseh. Damage in Johnson county to roads and bridges was estimated at 1 million dollars.  The flooding continued into Pawnee county.  The flood waters also affected agricultural lowlands.

Flood in PAWNEE, NEBRASKA
From 25-APR-08 10:00:00 to 25-APR-08 14:00:00 (CST-6)
Location: MAYBERRY
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Rainfall of 2 to 6 inches in a few hours time caused flooding along Turkey Creek from Johnson county into Pawnee county to near Steinauer.  The flooding caused some road damage and structual damage to 1 bridge in Pawnee county.  The flood waters also affected agricultural lowlands.