EF0 tornado, Clinton, Oklahoma, September 11, 2008

1. EF065 to 85 mphthis tornado

   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 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

EF0

Date

September 11, 2008

Touchdown

8:35 PM CDT (01:35 UTC)

Lifted

8:36 PM CDT (01:36 UTC)

On the ground

1 minutes

Path length

0.5 miles (0.8 km)

Path width

40 yards (37 m)

Deaths

0

Injuries

0

County

Custer County

Touchdown point

35.550, -98.950

Lift-off point

35.550, -98.950

Record number

0809111935-01

A prolonged area of southwest flow developed over much of Oklahoma during the period from the 10th through the 12th. Numerous disturbances moving through the flow allowed for widespread showers and thunderstorms to develop and move northeast over the area. Also, moisture associated with remnant Tropical Storm Lowell moved over western and northern Oklahoma. Although winds at most locations were nearly calm during the event, enough wind shear was in place for very small, short-lived circulations to develop. Two areas of damage were reported with brief tornadoes, one near the Clinton airport in Custer county, and the other in Tonkawa in Kay county. The damage was relatively minor, with tree and roof damage reported. Several chickens were killed when their chicken coop was destroyed. Monetary damages were estimated.

A brief tornado struck near the intersection of roads E1010 and N2270, to the northwest of Clinton Regional Airport. One utility pole was damaged. One residence was damaged and lost half of its roof, and the roof on a mobile home was damaged. One chicken coop was destroyed and all the livestock inside killed. Monetary damages were unavailable.

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

No tornado warning for this county appears in the archive as in force at the moment the tornado touched down.

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 General Thunderstorms Risk. The outlook in force was issued at 00:51 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 Altus AFB radar (KFDR), 132 km away, was scanning. The volume nearest the touchdown began at 01:35 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 2008 tornado in OklahomaEvery tornado in Oklahoma since 1950Warnings in force in Oklahoma nowThe forecast where you are

2 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.