Severe thunderstorms developed ahead of and along a strong cold front that moved into the region during the early afternoon of the 7th. A couple of the storms evolved into supercell thunderstorms early in the event across southeastern Kansas and northeastern Oklahoma. One such storm developed over Washington County and moved eastward across Nowata County. This storm produced significant damage across central Nowata County as a result of hail up to baseball size and wind gusts of 80 to 100 mph. The supercell thunderstorm then merged into a developing line of severe thunderstorms along the cold frontal boundary over eastern Nowata County. The line of storms subsequently produced numerous reports of damaging wind across northeast and east-central Oklahoma.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 07-SEP-12 14:20:00 to 07-SEP-12 14:20:00 (CST-6)
Location: NOWATA ARPT
Magnitude: 87.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An intense downburst destroyed a double wide mobile home, killing three occupants. The strong thunderstorm wind also destroyed at least two other mobile homes, damaged the roofs and siding of a number of permanent homes, destroyed a number of steel-framed or wood-framed outbuildings, snapped many power poles, and snapped or uprooted trees in this area.

Thunderstorm Wind in OTTAWA, OKLAHOMA
From 07-SEP-12 15:07:00 to 07-SEP-12 15:07:00 (CST-6)
Location: MIAMI
Magnitude: 65.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew a tractor trailer over a concrete retaining wall on I-44, resulting in the death of the driver.

Thunderstorm Wind in OTTAWA, OKLAHOMA
From 07-SEP-12 15:04:00 to 07-SEP-12 15:04:00 (CST-6)
Location: MIAMI
Magnitude: 65.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew over a tractor trailer on I-44, injuring its driver.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 07-SEP-12 14:15:00 to 07-SEP-12 14:15:00 (CST-6)
Location: NOWATA ARPT
Magnitude: 80.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tractor trailer was overturned by strong thunderstorm wind on Highway 169.

Thunderstorm Wind in LE FLORE, OKLAHOMA
From 07-SEP-12 17:40:00 to 07-SEP-12 17:40:00 (CST-6)
Location: CAMERON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Large tree limbs were blown down by strong thunderstorm wind in Cameron.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 07-SEP-12 14:15:00 to 07-SEP-12 14:15:00 (CST-6)
Location: NOWATA
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Power lines were blown down by strong thunderstorm wind.

Thunderstorm Wind in WASHINGTON, OKLAHOMA
From 07-SEP-12 14:30:00 to 07-SEP-12 14:30:00 (CST-6)
Location: VERA
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Strong thunderstorm wind blew portions of a roof off of a home.

Thunderstorm Wind in ROGERS, OKLAHOMA
From 07-SEP-12 14:45:00 to 07-SEP-12 14:45:00 (CST-6)
Location: CATALE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Strong thunderstorm wind blew down large tree limbs.

Thunderstorm Wind in ROGERS, OKLAHOMA
From 07-SEP-12 14:45:00 to 07-SEP-12 14:45:00 (CST-6)
Location: CLAREMORE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large tree was uprooted by strong thunderstorm wind.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 07-SEP-12 14:48:00 to 07-SEP-12 14:48:00 (CST-6)
Location: NOWATA
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong thunderstorm wind damaged the metal siding of an outdoor garage, blew shingles off the roofs of several homes, and snapped large tree limbs.

Thunderstorm Wind in CRAIG, OKLAHOMA
From 07-SEP-12 14:53:00 to 07-SEP-12 14:53:00 (CST-6)
Location: VINITA ARPT
Magnitude: 73.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm wind gusts were measured to 84 mph at the Vinita toll booth on Will Rogers Turnpike.

Thunderstorm Wind in ROGERS, OKLAHOMA
From 07-SEP-12 14:54:00 to 07-SEP-12 14:54:00 (CST-6)
Location: CLAREMORE
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Strong thunderstorm wind uprooted several trees and damaged the roofs of homes.

Thunderstorm Wind in OTTAWA, OKLAHOMA
From 07-SEP-12 14:58:00 to 07-SEP-12 14:58:00 (CST-6)
Location: QUAPAW
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Strong thunderstorm wind blew down large tree limbs.

Thunderstorm Wind in OTTAWA, OKLAHOMA
From 07-SEP-12 15:10:00 to 07-SEP-12 15:10:00 (CST-6)
Location: WYANDOTTE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

Strong thunderstorm wind blew down several trees around town.

Thunderstorm Wind in OTTAWA, OKLAHOMA
From 07-SEP-12 15:20:00 to 07-SEP-12 15:20:00 (CST-6)
Location: AFTON ARPT
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

Several trees were blown down and numerous large tree limbs were snapped by strong thunderstorm wind between Fairland and Grove.

Thunderstorm Wind in OTTAWA, OKLAHOMA
From 07-SEP-12 14:55:00 to 07-SEP-12 14:55:00 (CST-6)
Location: COMMERCE
Magnitude: 70.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Strong thunderstorm wind damaged the roof of a home, damaged a brick wall of a building, and blew the roof off of a shop.

Thunderstorm Wind in DELAWARE, OKLAHOMA
From 07-SEP-12 15:25:00 to 07-SEP-12 15:25:00 (CST-6)
Location: JAY
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down numerous large tree limbs onto power lines.

Thunderstorm Wind in OTTAWA, OKLAHOMA
From 07-SEP-12 15:30:00 to 07-SEP-12 15:30:00 (CST-6)
Location: WYANDOTTE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

Strong thunderstorm wind blew down a few trees and numerous large tree limbs across the southeastern portion of the county.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 07-SEP-12 14:25:00 to 07-SEP-12 14:25:00 (CST-6)
Location: NOWATA ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Oklahoma Mesonet station northeast of Nowata measured 61 mph thunderstorm wind gusts.

Thunderstorm Wind in CRAIG, OKLAHOMA
From 07-SEP-12 15:30:00 to 07-SEP-12 15:30:00 (CST-6)
Location: BLUEJACKET
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind damaged portions of the metal roof of a home and damaged a carport.

Thunderstorm Wind in CHEROKEE, OKLAHOMA
From 07-SEP-12 16:00:00 to 07-SEP-12 16:00:00 (CST-6)
Location: TAHLEQUAH
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong thunderstorm wind blew the roof off of a barn and blew down large tree limbs.

Hail in NOWATA, OKLAHOMA
From 07-SEP-12 14:15:00 to 07-SEP-12 14:15:00 (CST-6)
Location: NOWATA
Magnitude: 2.75 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Wind-driven baseball size hail broke windows, damaged the roofs and siding of homes, and damaged automobiles.

Thunderstorm Wind in OTTAWA, OKLAHOMA
From 07-SEP-12 15:00:00 to 07-SEP-12 15:00:00 (CST-6)
Location: MIAMI
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Oklahoma Mesonet station near Miami measured 63 mph thunderstorm wind gusts.

Thunderstorm Wind in MCINTOSH, OKLAHOMA
From 07-SEP-12 16:15:00 to 07-SEP-12 16:15:00 (CST-6)
Location: CHECOTAH
Magnitude: 61.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down privacy fences, tore the roof off of a shed, and damaged the roofs of several homes.

Thunderstorm Wind in HASKELL, OKLAHOMA
From 07-SEP-12 16:45:00 to 07-SEP-12 16:45:00 (CST-6)
Location: TAMAHA
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Numerous large tree limbs were blown down by strong thunderstorm wind and the roof of a shed was damaged.

Thunderstorm Wind in HASKELL, OKLAHOMA
From 07-SEP-12 16:53:00 to 07-SEP-12 16:53:00 (CST-6)
Location: KEOTA
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: County Official

Strong thunderstorm wind damaged the roof of a home and snapped many large tree limbs.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 07-SEP-12 14:20:00 to 07-SEP-12 14:20:00 (CST-6)
Location: NOWATA ARPT
Magnitude: 74.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Strong thunderstorm wind blew the doors off a steel-framed hangar, blew off a large portion of the roof of another steel-framed hangar, and flipped an airplane. A large steel-framed building just west of the airport had major damage to the roof and siding.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 07-SEP-12 14:20:00 to 07-SEP-12 14:20:00 (CST-6)
Location: NOWATA
Magnitude: 74.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Strong thunderstorm wind snapped a number of power poles and uprooted trees.

Hail in NOWATA, OKLAHOMA
From 07-SEP-12 14:20:00 to 07-SEP-12 14:20:00 (CST-6)
Location: NOWATA ARPT
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Wind-driven golfball size hail broke windows, damaged the roofs and siding of homes, and damaged automobiles.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 07-SEP-12 14:30:00 to 07-SEP-12 14:30:00 (CST-6)
Location: NOWATA
Magnitude: 74.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Strong thunderstorm wind destroyed several steel-framed structures, damaged a number of homes, snapped numerous power poles, and snapped or uprooted trees.

Thunderstorm Wind in OTTAWA, OKLAHOMA
From 07-SEP-12 14:58:00 to 07-SEP-12 14:58:00 (CST-6)
Location: MIAMI
Magnitude: 70.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew much of the roof off of a city maintenance wood-framed outbuilding and snapped large tree limbs.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 07-SEP-12 14:07:00 to 07-SEP-12 14:07:00 (CST-6)
Location: SOUTH COFFEEVILLE AR
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees and power lines were blown down by strong thunderstorm wind.

Thunderstorm Wind in SEQUOYAH, OKLAHOMA
From 07-SEP-12 17:00:00 to 07-SEP-12 17:00:00 (CST-6)
Location: SALLISAW ARPT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Oklahoma Mesonet station near Sallisaw measured 58 mph thunderstorm wind gusts.

Thunderstorm Wind in SEQUOYAH, OKLAHOMA
From 07-SEP-12 17:06:00 to 07-SEP-12 17:06:00 (CST-6)
Location: MULDROW
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong thunderstorm wind blew down trees.

Thunderstorm Wind in LE FLORE, OKLAHOMA
From 07-SEP-12 17:14:00 to 07-SEP-12 17:14:00 (CST-6)
Location: PANAMA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A storm spotter estimated thunderstorm wind gusts to 65 mph.

Thunderstorm Wind in LE FLORE, OKLAHOMA
From 07-SEP-12 17:15:00 to 07-SEP-12 17:15:00 (CST-6)
Location: PANAMA
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down trees.

Thunderstorm Wind in LE FLORE, OKLAHOMA
From 07-SEP-12 17:25:00 to 07-SEP-12 17:25:00 (CST-6)
Location: POTEAU
Magnitude: 70.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down numerous trees and power lines.