F1 tornado, Jordan to Bigbee, Alabama, November 15, 2006

1. F040 to 72 mph

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

2. F173 to 112 mphthis tornado

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

3. F2113 to 157 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. F3158 to 206 mph

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

5. F4207 to 260 mph

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

6. F5261 to 318 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

F1

Date

November 15, 2006

Touchdown

5:44 AM CST (11:44 UTC)

Path length

7.8 miles (12.5 km)

Path width

300 yards (274 m)

Deaths

0

Injuries

0

Property damage

$750,000

County

Washington County

Touchdown point

31.490, -88.290

Lift-off point

31.560, -88.200

Record number

1034

Strong southerly winds developed ahead of a cold front and caused low level shear to increase across the area. This low level shear aided in the development of several tornadoes across the area.

A tornado first touched down west of County Road 15 just south of Sleepy Hollow Lane. Tree and roof damage was observed in this area. The tornado moved northeast crossing State Highway 17 near Jordan. This is where most of the damage from the tornado was found. Numerous homes had roof damage and with several trees down. A well constructed horse stable was damaged and several valuable horses were injured with one killed. The tornado continued northeast for several miles over open land crossing County Road 31 south of CC Trail Road. Mostly tree damage occurred in this area. The tornado dissipated near CC Trail Road.

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

23 minutes of warning. NWS MOB issued a tornado warning for this county at 11:21 UTC, 23 minutes before the tornado touched down, in force until 12:15 UTC.

The county was under a tornado watch, issued at 10:00 UTC and running to 15:58 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 Moderate Risk, with a 0.15 chance of a tornado within 25 miles, in the hatched area where significant tornadoes were expected. The outlook in force was issued at 05:58 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.

The Mobile radar (KMOB), 94 km away, was scanning. The volume nearest the touchdown began at 11:43 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 2006 tornado in AlabamaEvery tornado in Alabama since 1950Warnings in force in Alabama nowThe forecast where you are

27 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.