Tornadoes · United States · Texas · 2007
EF0 tornado, Acampo to Ft Griffin, Texas, May 8, 2007
From Acampo to Ft Griffin, this EF0 tornado ran 6.5 miles across Shackelford County on May 8, 2007, touching down at 4:11 PM CDT and reaching 50 yards wide. It killed nobody.
The rating scale
Tracks are drawn in the color of the rating. The Enhanced Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.
EF065 to 85 mphthis tornado
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
EF186 to 110 mph
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
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.
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.
EF4166 to 200 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
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.
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.
The record
- Rating
- EF0
- Date
- May 8, 2007
- Touchdown
- 4:11 PM CDT (21:11 UTC)
- Lifted
- 4:30 PM CDT (21:30 UTC)
- On the ground
- 19 minutes
- Path length
- 6.5 miles (10.5 km)
- Path width
- 50 yards (46 m)
- Deaths
- 0
- Injuries
- 0
- County
- Shackelford County
- Touchdown point
- 32.797, -99.468
- Lift-off point
- 32.872, -99.396
- Record number
- 0705081511-01
What the Weather Service recorded
In the afternoon a squall line developed over the Permian Basin and moved to the east across West Central Texas. One of the thunderstorms embedded within the line produced a tornado near Haskell that damaged a house. A supercell also developed ahead of the line in Shackelford and moved north into Throckmorton County and produced at least two tornadoes.
A trained spotter reported and photgraphed a well developed cone tornado in rural northwest Shakelford County. The tornado remaind on the ground for several minutes over open range land.
From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.
The warnings
No tornado warning for this county appears in the archive as in force at the moment the tornado touched down. One was issued for the county at another hour that day.
The county was under a severe thunderstorm watch, issued at 20:42 UTC and running to 03:00 UTC.
| Issued (UTC) | Expired | Product | Office |
|---|---|---|---|
| 20:42 UTC | 03:00 UTC | Severe Thunderstorm Watch | SJT |
| 21:34 UTC | 21:57 UTC | Tornado Warning | SJT |
| 22:32 UTC | 02:30 UTC | Flash Flood Warning | SJT |
| 23:08 UTC | 23:45 UTC | Severe Thunderstorm Warning | SJT |
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 forecast that day
The Storm Prediction Center had this point in a Slight Risk, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 19:54 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 air that afternoon
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.
Fort Worth, TX (KFWD), 12:00Z
9.2 hours before the tornado, 200 km from the path. May 8, 2007.
- Mixed-layer CAPE
- 770 J/kg
- Mixed-layer CIN
- -117 J/kg
- Surface CAPE
- 154 J/kg
- Mixed-layer LCL
- 953 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
- 0-3 km lapse rate
- 4.3 K/km
Fort Worth, TX (KFWD), 00:00Z
2.8 hours after it, 200 km from the path. May 9, 2007.
- Mixed-layer CAPE
- 1069 J/kg
- Mixed-layer CIN
- -4 J/kg
- Surface CAPE
- 1631 J/kg
- Mixed-layer LCL
- 1302 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
- 0-3 km lapse rate
- 7.0 K/km
The radar
The Dyess AFB radar (KDYX), 37 km away, was scanning. The volume nearest the touchdown began at 21:11 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.
What was reported nearby
Local storm reports within 60 km of the path, in the three hours either side.
| Time (UTC) | Report | Where | County | Remark |
|---|---|---|---|---|
| 21:11 UTC | TORNADO | 11 Wnw Albany | Shackelford, TX | TORNADO LASTED SEVERAL MINUTES |
| 22:30 UTC | TORNADO | 5 S Haskell | Haskell, TX | BRIEF TORNADO TOUCHDOWN |
| 22:38 UTC | TORNADO | 5 Sw Haskell | Haskell, TX | TORNADO OBSERVED APPROXIMATELY 5 MILES SOUTHWEST OF HASKELL BY SHERIFFS DEPUTY. |
| 22:40 UTC | TORNADO | 3 Sw Haskell | Haskell, TX | SIGNIFICANT TORNADO DAMAGE TO HOME ON MULE CREEK ROAD WITH ROOF DAMAGE...AND WINDOWS BLOWN OUT OF HOME AND VEHICLE. TRACTOR ALSO TURNED OVER...AND COTTON TRAILER ROLLED ONTO ROAD. INFORMATION RELAYED VIA SHERRIFFS OFFICE |
| 22:54 UTC | TORNADO | 7 Nw Throckmorton | Throckmorton, TX | STORM CHASE TOUR GROUP REPORTS TORNADO NORTHWEST OF THROCKMORTON BETWEEN 554 PM AND 556 PM. TORNADO BECAME RAIN-WRAPPED AFTER 556 PM. |
From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.
This ground now
The live radar over the trackEvery 2007 tornado in TexasEvery tornado in Texas since 1950Warnings in force in Texas nowThe forecast where you are
The other tornadoes of May 8, 2007
8 more were confirmed in the United States that day.
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|---|---|---|---|---|---|---|---|
| May 8 | 5:30 PM CDT | EF1 | Haskell, TX | 4.2 | 45 | $10,000 | ||
| May 8 | 5:54 PM CDT | EF0 | Throckmorton, TX | 0.8 | 40 | |||
| May 8 | 8:15 PM CDT | EF0 | Comanche, OK | 0.2 | 30 | |||
| May 8 | 10:54 PM CDT | EF1 | Grady, OK | 1.5 | 30 | $70,000 | ||
| May 8 | 11:26 PM CDT | EF0 | Canadian, OK | 2.2 | 40 | $100,000 | ||
| May 8 | 11:43 PM CDT | EF1 | Canadian, OK | 1.8 | 150 | $3.0 million | ||
| May 8 | 12:08 AM CDT | EF1 | Canadian, OK | 0.6 | 80 | |||
| May 8 | 12:21 AM CDT | EF1 | Canadian, OK | 0.2 | 30 | $25,000 |
What this means
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.
Sources
NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.