Several thunderstorm clusters developed across or moved into eastern Nebraska during the late afternoon and evening of August 6th.  The storms developed along and ahead of a weak cold front aided by a disturbance rotating around an upper level trough along the U.S. and Canadian border.  Conditions over the area were moderately to extremely unstable as afternoon temperatures climbed into the 90s and dew point temperatures were in the 70s.  In some cases supercell thunderstorms formed bow echoes creating pockets of strong and damaging winds.

Thunderstorm Wind in BOONE, NEBRASKA
From 06-AUG-11 18:35:00 to 06-AUG-11 18:35:00 (CST-6)
Location: PETERSBURG
Magnitude: 52.00 EG
Reported by: Public

A thunderstorm wind gust estimated at 60 mph blew a 200 lb tank across a gas station parking lot.  The winds were accompanied by half dollar-size hail.

Thunderstorm Wind in LANCASTER, NEBRASKA
From 06-AUG-11 19:03:00 to 06-AUG-11 19:03:00 (CST-6)
Location: COBB
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm wind gusts estimated at around 60 mph were reported by emergency management near 56th and Denton Road.

Thunderstorm Wind in SALINE, NEBRASKA
From 06-AUG-11 18:59:00 to 06-AUG-11 18:59:00 (CST-6)
Location: DORCHESTER
Magnitude: 52.00 EG
Reported by: Trained Spotter

Tree limbs as large as 4 inches in diameter were downed by thunderstorm wind gusts estimated at 60 mph.

Hail in ANTELOPE, NEBRASKA
From 06-AUG-11 19:00:00 to 06-AUG-11 19:00:00 (CST-6)
Location: OAKDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in SARPY, NEBRASKA
From 06-AUG-11 19:29:00 to 06-AUG-11 19:29:00 (CST-6)
Location: SPRINGFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tree limbs at least 4 inches in diameter were downed by thunderstorm winds that were estimated at around 60 mph.  The fallen limbs partially blocked Highway 50 in southern Sarpy county.

Hail in PIERCE, NEBRASKA
From 06-AUG-11 19:30:00 to 06-AUG-11 19:30:00 (CST-6)
Location: PIERCE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in OTOE, NEBRASKA
From 06-AUG-11 19:45:00 to 06-AUG-11 19:45:00 (CST-6)
Location: SYRACUSE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm wind gusts estimated at around 60 mph downed some 4 to 6 inch in diameter tree limbs.  In addition a tree with a 10 inch in diameter trunk was downed across a road near Syracuse.

Thunderstorm Wind in PLATTE, NEBRASKA
From 06-AUG-11 19:45:00 to 06-AUG-11 19:45:00 (CST-6)
Location: PLATTE CENTER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm wind gusts estimated at around 60 mph downed some large tree limbs near Platte Center.

Thunderstorm Wind in OTOE, NEBRASKA
From 06-AUG-11 20:03:00 to 06-AUG-11 20:16:00 (CST-6)
Location: NEBRASKA CITY ARPT
Magnitude: 69.00 MG
Reported by: AWOS

A thunderstorm wind gust of 79 mph was measured by Awos at the Nebraska City airport at 916 pm CDT.  A gust of 60 mph was measured at 903 pm.  The winds caused scattered tree damage in the area.

Hail in PIERCE, NEBRASKA
From 06-AUG-11 20:15:00 to 06-AUG-11 20:15:00 (CST-6)
Location: PIERCE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Most of the hail was quarter-size, but a few were around ping-pong ball-size.

Hail in CEDAR, NEBRASKA
From 06-AUG-11 20:58:00 to 06-AUG-11 20:58:00 (CST-6)
Location: RANDOLPH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DOUGLAS, NEBRASKA
From 06-AUG-11 21:15:00 to 06-AUG-11 21:15:00 (CST-6)
Location: OMAHA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Reported near 63rd and Emmet Streets.

Hail in LANCASTER, NEBRASKA
From 06-AUG-11 23:42:00 to 06-AUG-11 23:44:00 (CST-6)
Location: WEST LINCOLN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Near 58th and R Streets.

Hail in NEMAHA, NEBRASKA
From 07-AUG-11 02:53:00 to 07-AUG-11 02:53:00 (CST-6)
Location: AUBURN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BUTLER, NEBRASKA
From 06-AUG-11 17:33:00 to 06-AUG-11 17:33:00 (CST-6)
Location: BONGERS ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in SEWARD, NEBRASKA
From 06-AUG-11 18:15:00 to 06-AUG-11 18:15:00 (CST-6)
Location: UTICA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter estimated thunderstorm wind gusts were around 60 mph.

Hail in BOONE, NEBRASKA
From 06-AUG-11 18:35:00 to 06-AUG-11 18:35:00 (CST-6)
Location: PETERSBURG
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail was accompanied by wind gusts estimated at 60 mph.

Hail in ANTELOPE, NEBRASKA
From 06-AUG-11 18:43:00 to 06-AUG-11 18:43:00 (CST-6)
Location: OAKDALE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in SEWARD, NEBRASKA
From 06-AUG-11 18:45:00 to 06-AUG-11 18:45:00 (CST-6)
Location: MILFORD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm wind gusts estimated at 60 mph downed 2-3 inch diameter tree limbs.

Thunderstorm Wind in PIERCE, NEBRASKA
From 06-AUG-11 21:30:00 to 06-AUG-11 21:30:00 (CST-6)
Location: OSMOND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm wind gusts estimated at 60 mph split a large tree and downed other branches in the Osmond area.

Thunderstorm Wind in SARPY, NEBRASKA
From 06-AUG-11 19:10:00 to 06-AUG-11 19:10:00 (CST-6)
Location: GRETNA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm wind gusts estimated at close to 60 mph damaged machine shed near Gretna.

Hail in BOONE, NEBRASKA
From 06-AUG-11 19:10:00 to 06-AUG-11 19:10:00 (CST-6)
Location: ALBION
Magnitude: 1.75 
Reported by: Newspaper

Hail up to golf ball-size fell west of Albion and was accompanied by winds in excess of 60 mph.  The wind and hail caused some crop and vehicle damage in the area.

Thunderstorm Wind in DOUGLAS, NEBRASKA
From 06-AUG-11 21:05:00 to 06-AUG-11 21:05:00 (CST-6)
Location: BENNINGTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds were estimated by a spotter at over 60 mph near Bennington.

Thunderstorm Wind in LANCASTER, NEBRASKA
From 06-AUG-11 19:15:00 to 06-AUG-11 19:28:00 (CST-6)
Location: LAKEVIEW
Magnitude: 56.00 EG
Reported by: Amateur Radio

A severe thunderstorm packing wind gusts estimated at over 60 mph downed many trees and caused other tree damage across Lincoln, notable south Lincoln.  Some of the fallen trees and limbs damaged property and downed power lines.  Damage reports included along B street, near 48th and Randolph, near 16th and Smith Streets, 10th and Lake Streets, 48th and J, 56th and South, 24th and Washington, near the Lancaster County Events Center, 54th and Princeton and 25th and E Streets.  LES reported around 14,000 customers lost power from the storm.

Thunderstorm Wind in SAUNDERS, NEBRASKA
From 06-AUG-11 20:35:00 to 06-AUG-11 20:35:00 (CST-6)
Location: CEDAR BLUFFS
Magnitude: 52.00 MG
Reported by: Fire Department/Rescue

Thunderstorm wind gusts were estimated at around 60 mph by fire/rescue squad personnel.  The winds downed trees and snapped some power poles in the region.

Thunderstorm Wind in COLFAX, NEBRASKA
From 06-AUG-11 20:08:00 to 06-AUG-11 20:08:00 (CST-6)
Location: SCHUYLER
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm wind gusts estimated at over 60 mph caused significant tree damage around the Schuyler area along with some property damage.

Thunderstorm Wind in BOONE, NEBRASKA
From 06-AUG-11 19:10:00 to 06-AUG-11 19:10:00 (CST-6)
Location: ALBION
Magnitude: 56.00 EG
Reported by: Trained Spotter

Thunderstorm wind gusts estimated at over 60 mph caused shed damage and downed large tree limbs.  Some hail up to golf ball-size accompanied the strong winds west of Albion, and 2.25 inches of rain fell in less than 60 minutes from the storm.

Thunderstorm Wind in DOUGLAS, NEBRASKA
From 06-AUG-11 20:47:00 to 06-AUG-11 20:57:00 (CST-6)
Location: VALLEY
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Thunderstorm wind gusts were measured at 66 mph at the NWS office near Valley at 957 pm CDT, this followed earlier gusts of 61 mph at 947 pm and 64 mph at 954 pm.  The strong winds extended into southwest Omaha where tree limbs downed power lines and knocked out power to at least 10,000 customers, mainly in the Millard area.

Thunderstorm Wind in SARPY, NEBRASKA
From 06-AUG-11 19:05:00 to 06-AUG-11 19:05:00 (CST-6)
Location: SPRINGFIELD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public estimated thunderstorm wind gusts of at least 50 to 60 mph.