A severe mesoscale convective system (MCS) that originated in central Kansas on the 17th progressed east and southeast into the Tennessee Valley during the afternoon of the 18th.  Several small scale bow echoes produced the strongest wind damage, while a larger scale gust front produced widespread sub-severe winds of 30 to 50 mph.  These winds still knocked large tree limbs and small trees down.  Power was knocked out for about 12,000 utility customers in Madison County.  Heavier damage occurred in northern Jackson County where numerous trees and power line were knocked down.

Thunderstorm Wind in JACKSON, ALABAMA
From 18-JUN-11 13:25:00 to 18-JUN-11 13:30:00 (CST-6)
Location: HOLLYTREE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: COOP Observer

Two trees were snapped. A six inch diameter tree was snapped near its base, while a nearby sapling one inch in diameter was snapped halfway up the tree.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:20:00 to 18-JUN-11 13:25:00 (CST-6)
Location: RYLAND
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple trees and branches at least one inch in diameter were blown down on Ryland Pike.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:05:00 to 18-JUN-11 13:15:00 (CST-6)
Location: HARVEST EPPS ARPT
Magnitude: 39.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

A shed sustained roof damage.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:13:00 to 18-JUN-11 13:18:00 (CST-6)
Location: MINT SPG
Magnitude: 36.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: COOP Observer

A gust to 41 mph was measured.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:24:00 to 18-JUN-11 13:29:00 (CST-6)
Location: (HSV)HUNTSVILLE JONE
Magnitude: 35.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Some branches were blown off a tree onto a roof.

Thunderstorm Wind in MARSHALL, ALABAMA
From 18-JUN-11 14:07:00 to 18-JUN-11 14:12:00 (CST-6)
Location: WARRENTON
Magnitude: 39.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down on a power line on Cha-La-Kee road.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:33:00 to 18-JUN-11 13:38:00 (CST-6)
Location: GURLEY
Magnitude: 48.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and some power lines were reported down from Gurley to the eastern edge of the county.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:35:00 to 18-JUN-11 13:38:00 (CST-6)
Location: GURLEY
Magnitude: 39.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Power lines were reported knocked down from Childress to Jackson roads.

Thunderstorm Wind in MARSHALL, ALABAMA
From 18-JUN-11 14:09:00 to 18-JUN-11 14:14:00 (CST-6)
Location: LANE
Magnitude: 39.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down near Hustleville road.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:16:00 to 18-JUN-11 13:21:00 (CST-6)
Location: FLETCHER CHAPEL
Magnitude: 39.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A Bradford Pear tree was blown down in the Cumming Research Park area.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:15:00 to 18-JUN-11 13:20:00 (CST-6)
Location: HARVEST EPPS ARPT
Magnitude: 39.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

A funeral tent was blown over and sustained some damage.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:16:00 to 18-JUN-11 13:21:00 (CST-6)
Location: HUNTSVILLE MILLS ARP
Magnitude: 39.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

A large pine tree fell on a vehicle behind a house at this location.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:18:00 to 18-JUN-11 13:23:00 (CST-6)
Location: BELL FACTORY
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down on Streakley road.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:20:00 to 18-JUN-11 13:25:00 (CST-6)
Location: MOLDER
Magnitude: 50.00 EG
Property damage: 16.00K
Crop damage: 0.00K
Reported by: Public

Multiple trees and branches blown down.  Several privacy fences knocked down.

Thunderstorm Wind in DEKALB, ALABAMA
From 18-JUN-11 14:36:00 to 18-JUN-11 14:41:00 (CST-6)
Location: STAMP
Magnitude: 48.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines were blown down.

Thunderstorm Wind in MARSHALL, ALABAMA
From 18-JUN-11 14:14:00 to 18-JUN-11 14:19:00 (CST-6)
Location: LITTLE NEW YORK
Magnitude: 39.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down near Baker road.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:18:00 to 18-JUN-11 13:23:00 (CST-6)
Location: HUNTSVILLE MILLS ARP
Magnitude: 39.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Public

Large trees were blown down on Minor Street between Pratt Avenue and Ward Street. Power lines were also knocked down.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:22:00 to 18-JUN-11 13:22:00 (CST-6)
Location: MONROVIA
Magnitude: 36.00 EG
Property damage: 0.20K
Crop damage: 0.00K
Reported by: NWS Employee

A 41 mph gust was measured on Hughes road.

Thunderstorm Wind in DEKALB, ALABAMA
From 18-JUN-11 14:41:00 to 18-JUN-11 14:46:00 (CST-6)
Location: FT PAYNE
Magnitude: 39.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down at the 1700 block of CR 89.

Thunderstorm Wind in DEKALB, ALABAMA
From 18-JUN-11 14:40:00 to 18-JUN-11 14:45:00 (CST-6)
Location: VALLEY HEAD
Magnitude: 43.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down along Highway 117 in the Valley Head community.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:18:00 to 18-JUN-11 13:23:00 (CST-6)
Location: NEW MARKET
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several trees were blown down along Winchester road.

Thunderstorm Wind in DEKALB, ALABAMA
From 18-JUN-11 14:40:00 to 18-JUN-11 14:45:00 (CST-6)
Location: FT PAYNE
Magnitude: 39.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down along Highway 11 in the Fort Payne community.

Thunderstorm Wind in JACKSON, ALABAMA
From 18-JUN-11 13:30:00 to 18-JUN-11 13:35:00 (CST-6)
Location: PAINT ROCK
Magnitude: 46.00 EG
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Public

Three trees were uprooted and numerous trees branches were knocked down.

Thunderstorm Wind in JACKSON, ALABAMA
From 18-JUN-11 13:41:00 to 18-JUN-11 13:46:00 (CST-6)
Location: SKYLINE
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several reports of trees and power lines knocked down in the skyline area. Power outages were reported as well.

Thunderstorm Wind in JACKSON, ALABAMA
From 18-JUN-11 13:53:00 to 18-JUN-11 13:58:00 (CST-6)
Location: BRIDGEPORT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was knocked down onto a home on CR 206.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:19:00 to 18-JUN-11 13:24:00 (CST-6)
Location: MOORES MILL
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Six large trees were blown down and part of a barn roof was ripped off. Numerous branches blown down as well.

Thunderstorm Wind in JACKSON, ALABAMA
From 18-JUN-11 13:25:00 to 18-JUN-11 13:30:00 (CST-6)
Location: HOLLYTREE
Magnitude: 56.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Public

Four trees were blown down in the Holly Tree area.

Thunderstorm Wind in JACKSON, ALABAMA
From 18-JUN-11 13:53:00 to 18-JUN-11 13:58:00 (CST-6)
Location: BRIDGEPORT
Magnitude: 65.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees and power lines were knocked down in the city of Bridgeport and the surrounding areas. Numerous power outages were reported in the area. One tree was knocked onto a home on Dr. Lee Avenue in Bridgeport.

Thunderstorm Wind in LIMESTONE, ALABAMA
From 18-JUN-11 12:50:00 to 18-JUN-11 12:55:00 (CST-6)
Location: ARDMORE
Magnitude: 50.00 EG
Property damage: 16.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were blown down in and around Ardmore, especially on Main Street.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:13:00 to 18-JUN-11 13:18:00 (CST-6)
Location: FAIRVIEW
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was reported down along Greenville Pike road in northern Madison county.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:18:00 to 18-JUN-11 13:23:00 (CST-6)
Location: BELL FACTORY
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Trees were blown down on Bell Factory Road.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:18:00 to 18-JUN-11 13:23:00 (CST-6)
Location: RYLAND
Magnitude: 39.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple tree branches were blown down, some of which were one inch in diameter.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:24:00 to 18-JUN-11 13:29:00 (CST-6)
Location: (HSV)HUNTSVILLE JONE
Magnitude: 35.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 100 foot tall pine tree was blown down onto a house on Bremerton Drive.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:23:00 to 18-JUN-11 13:27:00 (CST-6)
Location: MAYSVILLE
Magnitude: 39.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down on Hurricane Creek road.

Thunderstorm Wind in MADISON, ALABAMA
From 18-JUN-11 13:18:00 to 18-JUN-11 13:23:00 (CST-6)
Location: MAYSVILLE
Magnitude: 39.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown along Brownsboro road.