EF2 tornado, Groom to Panhandle, Texas, April 21, 2007

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 mph

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

3. EF2111 to 135 mphthis tornado

   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

EF2

Date

April 21, 2007

Touchdown

9:37 PM CDT (02:37 UTC)

Lifted

10:10 PM CDT (03:10 UTC)

On the ground

33 minutes

Path length

12.4 miles (19.9 km)

Path width

440 yards (402 m)

Deaths

0

Injuries

0

Property damage

$72,000

County

Carson County

Touchdown point

35.185, -101.119

Lift-off point

35.350, -101.203

Record number

0704212037-01

Numerous severe thunderstorms producing large hail...damaging winds...and tornadoes moved north and northeast across the western and central Texas panhandle during the evening hours. The only injuries occurred in Cactus from a tornado...however no fatalities were reported.

This tornado formed nine miles east northeast of Claude at 2035 CST and entered Carson county at 2037 CST one and a half miles southwest of Groom. The tornado tracked north and traveled about another ten miles before dissipating at 2110 CST ten miles east of Panhandle. In Carson county...the tornado plowed through a storage area for tractors and other farm equipment. Tractors...turbines...vehicles...cotton presser box cars similar to railroad cars were moved and thrown about in the tornado for considerable distances. Power poles were also damaged. No injuries were reported.

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

12 minutes of warning. NWS AMA issued a tornado warning for this county at 02:25 UTC, 12 minutes before the tornado touched down, in force until 03:00 UTC.

The county was under a tornado watch, issued at 20:56 UTC and running to 05:00 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 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 01:02 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.

Pampa (PPA), 41 km from the path, in the two hours either side.

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

The Amarillo radar (KAMA), 50 km away, was scanning. The volume nearest the touchdown began at 02:35 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 2007 tornado in TexasEvery tornado in Texas since 1950Warnings in force in Texas 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.