EF1 tornado, Caddo to Fairview, Alabama, May 6, 2009

1. EF065 to 85 mph

   Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

2. EF186 to 110 mphthis tornado

   Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

3. EF2111 to 135 mph

   Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.

4. EF3136 to 165 mph

   Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

5. EF4166 to 200 mph

   Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

6. EF5over 200 mph

   Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.

7. Unrated

   The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.

Rating

EF1

Date

May 6, 2009

Touchdown

8:25 AM CDT (13:25 UTC)

Lifted

8:29 AM CDT (13:29 UTC)

On the ground

4 minutes

Path length

3.2 miles (5.1 km)

Path width

75 yards (69 m)

Deaths

0

Injuries

0

Property damage

$250,000

Counties

Lawrence and Morgan counties

Touchdown point

34.512, -87.130

Lift-off point

34.544, -87.083

Record number

0905060725-01

Strong thunderstorms erupted around Midnight on the 6th in northwest Alabama and tracked across portions of north Alabama. The storms produced one to three inches of rainfall in parts of Lawrence, Morgan, Cullman and Marshall Counties resulting in a few instances of flash flooding. Following this first round of thunderstorms, a vigorous quasi-linear convective system (QLCS) advanced eastward from northern Mississippi into northwest Alabama before sunrise. This system strengthened as it encountered increasing instability. Given high amounts of low level wind shear, a break in the line resulted as a strong comma head / mesocyclone developed. This storm evolved into its own miniature supercell spawning three tornadoes along its track from eastern Lawrence through Morgan, Limestone and Madison Counties. The tornado in Limestone and Madison County produced up to EF2 damage along its 10.9 mile track, narrowly missing an elementary school, high school, and two churches in Madison. Other reports of thunderstorm wind damage were received with these storms.

The tornado touched down in the backyard of a mobile home along CR 327. At this location, a large oak tree fell onto the mobile home splitting it in two where a woman and her young daughter were taking shelter. Numerous trees were uprooted and snapped surrounding the home. The tornado path continued northeast along CR 328 producing significant damage to another mobile home. More than half of the structure was moved off its well secured foundation and the majority of the roof was blown off. A few outbuildings were completely destroyed and vehicles were moved from their original locations in the driveway. Numerous large trees were snapped and uprooted at this location. Peak wind speed was estimated at 105 mph.

The tornado continued its track northeast into western portions of Morgan County. Numerous large trees were uprooted and snapped along it's path. Minor structural damage to homes occurred as trees were knocked down onto them. The tornado lifted about half of a mile north of the intersection of Raper Road and Pleasant Hill Road.

A tornado briefly touched down near the intersection of 7th Avenue and 5th Street in Decatur with peak winds of 80 mph. Trees were uprooted and snapped along the brief damage path. Several homes and vehicles were also damaged by the downed trees. The tornado lifted near the intersection of 16th Avenue and Sherman Street.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

1 minute of warning. NWS HUN issued a tornado warning for this county at 13:24 UTC, 1 minute before the tornado touched down, in force until 13:35 UTC.

The county was under a severe thunderstorm watch, issued at 09:05 UTC and running to 15:00 UTC.

Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.

The Storm Prediction Center had this point in a Slight Risk, with a 0.02 chance of a tornado within 25 miles. The outlook in force was issued at 12:47 UTC.

SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.

The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.

Decatur/Pryor Field (DCU), 20 km from the path, in the two hours either side.

From the Iowa Environmental Mesonet's archive of airport observations.

The Northeast Alabama radar (KHTX), 104 km away, was scanning. The volume nearest the touchdown began at 13:24 UTC.

Open the radar archive at this moment, over the track

Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2009 tornado in AlabamaEvery tornado in Alabama since 1950Warnings in force in Alabama nowThe forecast where you are

21 more were confirmed in the United States that day.

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.