The coverage of severe thunderstorms with damaging winds ended up being more widespread than initially expected on this late Tuesday afternoon and early evening. Primarily between 5-8 PM CDT, a small quasi-linear complex of outflow-dominant multicell storms marched across most of this six-county area from west-to-east, resulting in several reports of damaging winds of 60-70 MPH and a few instances of small hail up to nickel size. A few of the most noteworthy reports included estimated 70 MPH winds near Woodston that knocked down several power poles and rolled 15-20 large hay bales across a road, and estimated 70 MPH winds in and near Downs that blew the second story off a house under construction and flattened several fences. Even as storms were exiting the far eastern edge of the area, estimated 60 MPH winds knocked a tree onto power lines at Formoso in Jewell County, sparking a house fire. Although most of the area measured well under 1 inch of rain from these storms, a localized pocket of heavy rain targeted parts of southern Jewell and northern Mitchell counties, highlighted by totals of 2.76 inches at Cawker City and 1.95 at Jewell, where nickel size hail also fell.
The initial development of isolated, high-based multicell storms occurred over extreme northwest Kansas during the mid-afternoon hours along a subtle surface trough axis extending southwestward from north central Nebraska, with this activity gradually morphing into a quasi-linear complex as it charged east into North Central Kansas. In the mid and upper levels, flow was quasi-zonal and modest in strength, but contained weak embedded shortwave troughs well to the south of a much stronger wave sliding through eastern Montana. Although 0-6 kilometer vertical wind shear was only around 30 knots, surface-based CAPE up to around 1000 J/kg in the presence of a hot and deeply-mixed airmass with surface temperatures in the upper-90s and dewpoints only in the 50s resulted in a favorable environment for damaging outflow winds.

Thunderstorm Wind in ROOKS, KANSAS
From 04-SEP-12 16:50:00 to 04-SEP-12 16:50:00 (CST-6)
Location: ZURICH
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: County Official

Wind gusts estimated near 60 mph resulted in tree damage.

Thunderstorm Wind in ROOKS, KANSAS
From 04-SEP-12 16:50:00 to 04-SEP-12 16:50:00 (CST-6)
Location: STOCKTON
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: County Official

Wind gusts estimated near 70 mph caused tree damage in town, knocked over a shed, and ripped a roof off of a garage.

Thunderstorm Wind in ROOKS, KANSAS
From 04-SEP-12 16:58:00 to 04-SEP-12 17:00:00 (CST-6)
Location: WOODSTON
Magnitude: 61.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: County Official

Wind gusts estimated near 70 mph damaged around 40 power poles, resulting in the loss of power in town, and blew 15 to 20 hay bales across a road.

Thunderstorm Wind in OSBORNE, KANSAS
From 04-SEP-12 17:24:00 to 04-SEP-12 17:30:00 (CST-6)
Location: OSBORNE
Magnitude: 61.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated near 70 mph, snapping a few power poles, blowing off a shed roof and heavily damaging a grain bin along the path.

Thunderstorm Wind in OSBORNE, KANSAS
From 04-SEP-12 17:28:00 to 04-SEP-12 17:30:00 (CST-6)
Location: DOWNS
Magnitude: 61.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated near 70 mph damaged the second story of a house under construction on Highway 24.  A carport was also knocked over, several fences flattened, and several trees of 6 to 8 inches in diameter were blown down.

Thunderstorm Wind in MITCHELL, KANSAS
From 04-SEP-12 17:40:00 to 04-SEP-12 17:40:00 (CST-6)
Location: CAWKER CITY
Magnitude: 52.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gusts estimated near 60 mph knocked over a 12 inch diameter tree onto a house.

Thunderstorm Wind in JEWELL, KANSAS
From 04-SEP-12 17:52:00 to 04-SEP-12 17:52:00 (CST-6)
Location: JEWELL
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gusts estimated near 60 mph knocked down small tree limbs.

Thunderstorm Wind in JEWELL, KANSAS
From 04-SEP-12 18:05:00 to 04-SEP-12 18:05:00 (CST-6)
Location: FORMOSO
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: County Official

Wind gusts estimated near 60 mph knocked down part of a tree onto a power line, resulting in a house fire.

Thunderstorm Wind in PHILLIPS, KANSAS
From 04-SEP-12 16:42:00 to 04-SEP-12 16:42:00 (CST-6)
Location: PHILLIPSBURG ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hail in OSBORNE, KANSAS
From 04-SEP-12 17:15:00 to 04-SEP-12 17:15:00 (CST-6)
Location: OSBORNE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JEWELL, KANSAS
From 04-SEP-12 17:52:00 to 04-SEP-12 17:52:00 (CST-6)
Location: JEWELL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Pea to nickel size hail covered the yard.