← Back to Dashboard
April 20, 2011 · Lawrence County · 2011
EF1

April 20, 2011

3:58 AM
Lawrence County, Alabama · Near Moulton (ZIP 35650)
Fatalities
0
Injuries
0
Path Length
2.6 mi
Max Width
100 yd
DateApril 20, 2011
Time3:58 AM
CountyLawrence
CityMoulton
Property Loss$0
Crop Loss$0
SourceNCEI 309220
NWS Birmingham

4.8 SW Leola - 3.0 SSW Leola A brief 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, and crossed 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. Start: 34.3271/-87.3742 End: 34.3381/-87.3302

NWS EF Scale: F1

Event Narrative

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.

Episode Narrative

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.

Source Data
NCEI Event ID: 309220

See Also

2.6 mi100 yd wide