A large upper level low pressure system over the northern plains brought gusty southwest winds and warm and relatively dry air to eastern Nebraska and southwest Iowa during the afternoon of April 29th.  By early evening strong south winds transporting more moist and unstable air caused thunderstorms to develop over north central Kansas near the intersection of the drier air and this more unstable airmass.  These thunderstorms then tracked northeast into southeast Nebraska and southwest Iowa aided by an increasing low level jet.  The thunderstorms produced a modest amount of large hail reports and at least one tornado in southeast Nebraska.  Areas of heavy rain also accompanied some of the activity.

Hail in JEFFERSON, NEBRASKA
From 29-APR-10 17:55:00 to 29-APR-10 17:55:00 (CST-6)
Location: DAYKIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JEFFERSON, NEBRASKA
From 29-APR-10 19:12:00 to 29-APR-10 19:12:00 (CST-6)
Location: FAIRBURY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in SALINE, NEBRASKA
From 29-APR-10 18:10:00 to 29-APR-10 18:10:00 (CST-6)
Location: WILBER MUNI ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LANCASTER, NEBRASKA
From 29-APR-10 19:36:00 to 29-APR-10 19:36:00 (CST-6)
Location: KRAMER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LANCASTER, NEBRASKA
From 29-APR-10 20:46:00 to 29-APR-10 20:46:00 (CST-6)
Location: HICKMAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in LANCASTER, NEBRASKA
From 29-APR-10 20:58:00 to 29-APR-10 20:58:00 (CST-6)
Location: CHENEYS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in SAUNDERS, NEBRASKA
From 29-APR-10 21:15:00 to 29-APR-10 21:15:00 (CST-6)
Location: ASHLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm Wind in GAGE, NEBRASKA
From 29-APR-10 21:36:00 to 29-APR-10 21:36:00 (CST-6)
Location: BLUE SPGS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Thunderstorm wind gusts estimated at close to 60 mph blew 6 inch diameter metal irrigation pipes onto a road.

Heavy Rain in LANCASTER, NEBRASKA
From 29-APR-10 21:45:00 to 29-APR-10 21:45:00 (CST-6)
Location: BENNET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Rainfall of 2.75 inches in Bennet from several storms that moved across the area this evening caused considerable standing water in farm fields around town.

Hail in JEFFERSON, NEBRASKA
From 29-APR-10 20:56:00 to 29-APR-10 20:56:00 (CST-6)
Location: FAIRBURY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in JEFFERSON, NEBRASKA
From 29-APR-10 20:57:00 to 29-APR-10 20:57:00 (CST-6)
Location: ENDICOTT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail up to 2 inches in diameter caused damage to a car west southwest of Endicott.

Hail in SARPY, NEBRASKA
From 29-APR-10 20:40:00 to 29-APR-10 20:40:00 (CST-6)
Location: BELLEVUE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in OTOE, NEBRASKA
From 29-APR-10 21:00:00 to 29-APR-10 21:00:00 (CST-6)
Location: PALMYRA
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in SALINE, NEBRASKA
From 29-APR-10 17:58:00 to 29-APR-10 17:58:00 (CST-6)
Location: WESTERN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in JEFFERSON, NEBRASKA
From 29-APR-10 19:15:00 to 29-APR-10 19:15:00 (CST-6)
Location: ENDICOTT
Magnitude: 60.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm wind gusts estimated at over 65 mph downed trees and power lines along 710 road.  The damage was probably the rear flank downdraft from the supercell that spawned a tornado just to the northeast a few minutes later.

Hail in OTOE, NEBRASKA
From 29-APR-10 20:20:00 to 29-APR-10 20:20:00 (CST-6)
Location: BURR
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in GAGE, NEBRASKA
From 29-APR-10 20:41:00 to 29-APR-10 20:41:00 (CST-6)
Location: CORTLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JEFFERSON, NEBRASKA
From 29-APR-10 20:39:00 to 29-APR-10 20:39:00 (CST-6)
Location: REYNOLDS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in JEFFERSON, NEBRASKA
From 29-APR-10 19:22:00 to 29-APR-10 19:25:00 (CST-6)
Location: DILLER
Tornado F-scale: EF1
Property damage: 650.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An Assessment team from the NWS determined that a tornado tracked around 3 miles west through northwest of the Diller area.  The damage path was around 300 yards at its widest.  Trees and farm outbuildings were damaged along its path and 35 large power poles were snapped.  A house in the area also sustained major damage to the roof and windows and the upper floor was partially shifted from the lower floor and a wall was bowed outward and garage destroyed.  A center irrigation pivot was damaged at the tornadoes lifting point.