F1 tornado, Oak Grove to Mine La Motte, Missouri, March 11, 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

March 11, 2006

Touchdown

8:54 PM CST (02:54 UTC)

Path length

11.0 miles (17.7 km)

Path width

300 yards (274 m)

Deaths

0

Injuries

0

Counties

Madison, Saint Francois and Sainte Genevieve counties

Touchdown point

37.600, -90.320

Lift-off point

37.650, -90.250

Record number

79

The supercell thunderstorm that produced the Reynolds, Iron and Madison County tornado spawned another short lived tornado near Highway 72 and County Road 504 southeast of Oak Grove. A swath of trees were uprooted or snapped off.

The third tornado from the southeast Missouri supercell formed just southwest of Mine La Motte. The tornado traveled through the the west and north sections of the town producing F1 damage. A mobile home was destroyed, a barn was damaged, a metal outbuilding was destroyed, a barn damaged and a number of trees were either split or uprooted. The tornado continued northeast causing tree damage before crossing into extreme southeast St. Francois County near Little Peg Knob Mountain.

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

34 minutes of warning. NWS LSX issued a tornado warning for this county at 02:20 UTC, 34 minutes before the tornado touched down, in force until 03:15 UTC.

The county was under a tornado watch, issued at 00:54 UTC and running to 07:37 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 0.10 chance of a tornado within 25 miles, in the hatched area where significant tornadoes were expected. The outlook in force was issued at 01:07 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 St Louis radar (KLSX), 124 km away, was scanning. The volume nearest the touchdown began at 02:55 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 MissouriEvery tornado in Missouri since 1950Warnings in force in Missouri nowThe forecast where you are

14 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.