A long lived quasi-linear convective system (QLCS) developed in northern and central Mississippi and tracked eastward through northern Alabama during the early morning hours of the 20th.  A bow echo with a strong meso-vortex produced a long swath of wind damage from southern Franklin across Lawrence, Morgan, Cullman and Marshall counties.  Numerous trees were uprooted or snapped, indicating wind speeds of at least 70 mph or higher.  Trees were toppled onto two homes in Morgan and Cullman counties resulting in two injuries.  As the bow echo continued eastward, numerous reports of trees and damage to small structures were reported.   Following the storms, a meteorological phenomenon known as a wake low developed which produced a short period of damaging non-thunderstorm winds in Marshall County.  A wind gust of 60 mph was registered with this system at the Albertville, Alabama AWOS station (K8A0).  Several power outages were reported through the event.
A mesoscale convective system rolled through northern and central Alabama during the late evening hours of the 20th, and exited shortly after midnight on the 21st. Prolific lightning was generated with mainly elevated thunderstorms within the anvil region of this system across northern Alabama. A line of strong to severe thunderstorms extended south from the upper level circulation center which tracked east from northwest and west central Alabama. The storms produced sporadic thunderstorm wind damage, knocking down several trees in Franklin County. Most of the damage further east were tree limbs that did cause isolated small power outages. Although most areas received one half to one inch of rainfall, there were local amounts of one to just over two inches. This resulted in mostly nuisance minor street flooding, although one road was closed in Franklin County due to more substantial runoff.

High Wind in MARSHALL, ALABAMA
From 20-APR-11 05:30:00 to 20-APR-11 06:00:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked trees down west of Albertville, in the Pleasant Grove area. Trees were also knocked down along Oneonta Cutoff Road.

Flash Flood in CULLMAN, ALABAMA
From 20-APR-11 22:34:00 to 21-APR-11 00:00:00 (CST-6)
Location: CULLMAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Prolonged heavy rainfall led to numerous reports of flash flooding along Highway 31 between Cullman and Hanceville. Roads became nearly impassable.

Lightning in FRANKLIN, ALABAMA
From 20-APR-11 03:35:00 to 20-APR-11 03:35:00 (CST-6)
Location: VINA
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Lightning struck a car and set it on fire near the town of Vina.

Thunderstorm Wind in DEKALB, ALABAMA
From 20-APR-11 05:00:00 to 20-APR-11 05:05:00 (CST-6)
Location: DAWSON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked trees down and were blocking the roadways near the intersection of County Road 20 and County Road 843, east-northeast of Crossville.

Thunderstorm Wind in MARSHALL, ALABAMA
From 20-APR-11 23:14:00 to 20-APR-11 23:19:00 (CST-6)
Location: GUNTERSVILLE MUNI AR
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm winds knocked down small tree limbs around the Guntersville peninsula area.

Thunderstorm Wind in LAWRENCE, ALABAMA
From 20-APR-11 04:05:00 to 20-APR-11 04:10:00 (CST-6)
Location: MOULTON
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Damaging winds measured in excess of 60 MPH knocked down trees and powerlines portions of Lawrence County, especially in Moulton. This resulted in a widespread power outage in Moulton.

Thunderstorm Wind in JACKSON, ALABAMA
From 20-APR-11 04:30:00 to 20-APR-11 04:35:00 (CST-6)
Location: LARKINSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Straight-line winds from a severe thunderstorm pulled a metal roof off an old house near the intersection of County Road 529 and County Road 30.  The roof blew onto a powerline, knocking it down.

Thunderstorm Wind in CULLMAN, ALABAMA
From 20-APR-11 04:28:00 to 20-APR-11 04:30:00 (CST-6)
Location: BROOKLYN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked a large tree down on a house north of Holly Pond. One injury was reported.

Thunderstorm Wind in JACKSON, ALABAMA
From 20-APR-11 04:54:00 to 20-APR-11 04:59:00 (CST-6)
Location: ROSLIE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked trees down near Rosalie.

Lightning in FRANKLIN, ALABAMA
From 20-APR-11 03:35:00 to 20-APR-11 03:35:00 (CST-6)
Location: RUSSELLVILLE
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Lightning struck a house in the town of Russellville.

Thunderstorm Wind in MARSHALL, ALABAMA
From 20-APR-11 23:14:00 to 20-APR-11 23:19:00 (CST-6)
Location: ARAB
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm winds knocked down small tree limbs on powerlines which resulted in a small power outage in the town of Arab.

Thunderstorm Wind in JACKSON, ALABAMA
From 20-APR-11 05:32:00 to 20-APR-11 05:37:00 (CST-6)
Location: ROSLIE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked large trees down on a church in Rosalie along Highway 71. No injuries were reported. In addition, small outbuildings and sheds were damage around this area.

Thunderstorm Wind in JACKSON, ALABAMA
From 20-APR-11 05:38:00 to 20-APR-11 05:43:00 (CST-6)
Location: SCOTTSBORO
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked down large trees along Kyle Street in Scottsboro. This resulted in a widespread power outage. It is unknown how long the power outage lasted.

Thunderstorm Wind in FRANKLIN, ALABAMA
From 20-APR-11 20:20:00 to 20-APR-11 20:40:00 (CST-6)
Location: ROCKWOOD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Damaging straight-line winds resulted in numerous reports of trees down across eastern portions of Franklin County.

Lightning in LAUDERDALE, ALABAMA
From 20-APR-11 22:45:00 to 20-APR-11 22:45:00 (CST-6)
Location: ZIP CITY
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Lightning struck a house which knocked the power out but no fire occurred.

Heavy Rain in MARSHALL, ALABAMA
From 20-APR-11 23:25:00 to 20-APR-11 23:55:00 (CST-6)
Location: BOAZ
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain caused minor street flooding around Boaz.

Tornado in LAWRENCE, ALABAMA
From 20-APR-11 03:58:00 to 20-APR-11 04:02:00 (CST-6)
Location: LEOLA
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief EF-1 tornado (95 MPH max winds) touched down on the east side of the Sipsey Wilderness Area, along Forest Service Road (FSR) 208. Numerous trees were snapped and uprooted along a path that tracked nearly 3 miles northeast, corssing Highway 33 and ending around FSR 244 near Black Warrior. This tornado was embedded within a larger line of severe thunderstorms producing damaging straight-line winds. Additional sporadic areas of damage, mainly trees, were seen around the wilderness area.

Thunderstorm Wind in MORGAN, ALABAMA
From 20-APR-11 04:15:00 to 20-APR-11 04:20:00 (CST-6)
Location: UNION
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

A bowing line segment of severe thunderstorms created damaging straight-line winds. The winds blew a tree on a house and caused 1 injury.

Thunderstorm Wind in DEKALB, ALABAMA
From 20-APR-11 05:39:00 to 20-APR-11 05:44:00 (CST-6)
Location: FYFFE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked down numerous trees and powerlines in Fyffe and surrounding communities such as Dog Town, Tenbroeck and Peaks Corner.

Thunderstorm Wind in LIMESTONE, ALABAMA
From 20-APR-11 04:30:00 to 20-APR-11 04:32:00 (CST-6)
Location: GREENBRIER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Straight-line winds in excess of 60 MPH knocked a large tree down on top of a mobile home.  The occupant escaped without injury.

Thunderstorm Wind in FRANKLIN, ALABAMA
From 20-APR-11 03:40:00 to 20-APR-11 03:40:00 (CST-6)
Location: CHESTNUT RIDGE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds caused numerous trees and powerlines to go down along Highway 243 and County Road 79. This damage continued south along CR 79 to the Winston/Marion County line.

Thunderstorm Wind in DEKALB, ALABAMA
From 20-APR-11 05:10:00 to 20-APR-11 05:20:00 (CST-6)
Location: GERALDINE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds resulted in reports of trees down along Highway 227 between Geraldine and Grove Oak.

Thunderstorm Wind in CULLMAN, ALABAMA
From 20-APR-11 22:10:00 to 20-APR-11 22:25:00 (CST-6)
Location: WELTI
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked down trees along a narrow path across east-central Cullman County.  At this location, a tree was knocked down on a home along County Road 703. No injuries were reported.

Thunderstorm Wind in JACKSON, ALABAMA
From 20-APR-11 05:30:00 to 20-APR-11 05:35:00 (CST-6)
Location: ROSLIE
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds caused intense winds estimated near 80 MPH around the town of Pisgah. In this vicinity, a trailer was flipped over, small sheds were destroyed and large trees were knocked down.

Hail in JACKSON, ALABAMA
From 20-APR-11 04:30:00 to 20-APR-11 04:35:00 (CST-6)
Location: NAT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Quarter size hail occurred along Highway 72 between Huntsville and Scottsboro.  Hail covering the ground in places and cars were pulled off the road.

Thunderstorm Wind in MORGAN, ALABAMA
From 20-APR-11 04:20:00 to 20-APR-11 04:30:00 (CST-6)
Location: HARTSELLE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Damaging straight-line winds destroyed a small shed on Highway 31 and knocked trees down around Hartselle.

Thunderstorm Wind in CULLMAN, ALABAMA
From 20-APR-11 22:05:00 to 20-APR-11 22:15:00 (CST-6)
Location: CULLMAN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked down multiple trees between County Road 223 and County Road 703.

Thunderstorm Wind in MORGAN, ALABAMA
From 20-APR-11 04:15:00 to 20-APR-11 04:20:00 (CST-6)
Location: GANDYS COVE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

A bowing line segment created damaging straight-line winds that knocked down trees and destroyed a shed near Nat Key Rd and Gandy Cove Rd.

Thunderstorm Wind in DEKALB, ALABAMA
From 20-APR-11 05:45:00 to 20-APR-11 05:50:00 (CST-6)
Location: BEATY XRDS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds partially pulled up a roof of a residence with large trees branches snapped along County Road 651.

Thunderstorm Wind in DEKALB, ALABAMA
From 20-APR-11 05:39:00 to 20-APR-11 05:44:00 (CST-6)
Location: SKAGGS CORNER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked trees down along County Road 769 and County Road 371 near Ider.

Thunderstorm Wind in CULLMAN, ALABAMA
From 20-APR-11 22:15:00 to 20-APR-11 22:15:00 (CST-6)
Location: HANCEVILLE
Magnitude: 43.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Public

Public report of strong thunderstorm winds around 50 MPH near Hanceville. No significant damage noted.

Thunderstorm Wind in MARSHALL, ALABAMA
From 20-APR-11 04:32:00 to 20-APR-11 04:37:00 (CST-6)
Location: EDDY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked down large trees and caused power outages in the Ruth community along Highway 231, north of Arab.

High Wind in MARSHALL, ALABAMA
From 20-APR-11 05:04:00 to 20-APR-11 05:04:00 (CST-6)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

A 52 knot non-thunderstorm wind gust measured at Albertville Regional Airport (AWOS).

Thunderstorm Wind in CULLMAN, ALABAMA
From 20-APR-11 22:10:00 to 20-APR-11 22:25:00 (CST-6)
Location: WALTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Along the same path as earlier report of tree knocked down, this tree was knocked down onto a home on County Road 775.

Thunderstorm Wind in DEKALB, ALABAMA
From 20-APR-11 23:17:00 to 20-APR-11 23:17:00 (CST-6)
Location: KILPATRICK
Magnitude: 43.00 EG
Property damage: 0.10K
Crop damage: 0.00K
Reported by: Emergency Manager

Estimated 50 MPH thunderstorm winds around Kilpatrick. No damage reported.

Thunderstorm Wind in CULLMAN, ALABAMA
From 20-APR-11 04:20:00 to 20-APR-11 04:25:00 (CST-6)
Location: CULLMAN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked down trees and power lines near Cullman. One tree fell on a house but no injuries were reported.

Thunderstorm Wind in DEKALB, ALABAMA
From 20-APR-11 05:45:00 to 20-APR-11 05:50:00 (CST-6)
Location: BEATY XRDS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked a tree down on a mobile home along County Road 651. No injuries were reported.

Thunderstorm Wind in MARSHALL, ALABAMA
From 20-APR-11 04:35:00 to 20-APR-11 04:40:00 (CST-6)
Location: UNION GROVE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked several trees down near the Bama Drive and Union Chapel Road intersection. One tree fell on a house and another on a fence. No injuries were reported.

High Wind in MARSHALL, ALABAMA
From 20-APR-11 05:10:00 to 20-APR-11 05:40:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked numerous trees down in the Asbury community, specifically along Martling Road.

Thunderstorm Wind in MORGAN, ALABAMA
From 20-APR-11 04:20:00 to 20-APR-11 04:30:00 (CST-6)
Location: STRINGER
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked down 11 power poles/lines along Highway 67 between Couey Road and Eva Rd/CR 35.

Flash Flood in FRANKLIN, ALABAMA
From 20-APR-11 22:30:00 to 21-APR-11 01:30:00 (CST-6)
Location: PLEASANT RIDGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Significant rainfall has closed County Road 48, one mile east of Russellville.

Lightning in FRANKLIN, ALABAMA
From 20-APR-11 03:18:00 to 20-APR-11 03:18:00 (CST-6)
Location: RED BAY MUNI ARPT
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Lightning from a thunderstorms struck a house near the town of Red Bay during the early morning hours of April 20.

Thunderstorm Wind in COLBERT, ALABAMA
From 20-APR-11 20:25:00 to 20-APR-11 20:30:00 (CST-6)
Location: SPRING VLY
Magnitude: 40.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong winds knocked down tree branches which fell on powerlines. This caused a power outage in Spring Valley.

Thunderstorm Wind in MARSHALL, ALABAMA
From 20-APR-11 04:50:00 to 20-APR-11 04:55:00 (CST-6)
Location: ARAB
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Damaging straight-line winds knocked down numerous trees southwest to southeast of Arab.

Thunderstorm Wind in MORGAN, ALABAMA
From 20-APR-11 04:10:00 to 20-APR-11 04:15:00 (CST-6)
Location: PUMPKIN CENTER
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Newspaper

A large tree was uprooted on Brown Road in Danville.

High Wind in MARSHALL, ALABAMA
From 20-APR-11 05:05:00 to 20-APR-11 05:15:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds induced by a possible wake low directly behind a line of strong to severe thunderstorms caused numerous trees to get knocked down around Guntersville State Park and near the entrance on Highway 227.  One tree fell across a brand new camper and heavily damaged it.

Thunderstorm Wind in MORGAN, ALABAMA
From 20-APR-11 04:13:00 to 20-APR-11 04:18:00 (CST-6)
Location: PRICEVILLE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

A large tree was blown down on a mobile home, heavily damaging a good portion of the roof.

High Wind in MARSHALL, ALABAMA
From 20-APR-11 05:15:00 to 20-APR-11 05:45:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High winds knocked down numerous trees in and around Guntersville. Several houses sustained damage as trees fell on them (Creek Pass Rd, Hillwood Dr., Riley Road, and Sunset Dr.) but no injuries were reported. One Dodge Caravan was heavily damaged by one of the fallen trees.

Thunderstorm Wind in MORGAN, ALABAMA
From 20-APR-11 04:15:00 to 20-APR-11 04:25:00 (CST-6)
Location: HARTSELLE
Magnitude: 50.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Newspaper

A large 60 foot Oak tree was block down on South Sparkman Street.