Tornadoes · United States · Oklahoma · 2010

EF1 tornado, Bearden to Okfuskee, Oklahoma, May 10, 2010

From Bearden to Okfuskee, this EF1 tornado ran 14.0 miles across Okfuskee County on May 10, 2010, touching down at 6:45 PM CDT and reaching 1,000 yards wide. It killed nobody, and did $40,000 of property damage.

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.

  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 mphthis tornado

    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.

The record

Rating
EF1
Date
May 10, 2010
Touchdown
6:45 PM CDT (23:45 UTC)
Lifted
7:10 PM CDT (00:10 UTC)
On the ground
25 minutes
Path length
14.0 miles (22.5 km)
Path width
1,000 yards (914 m)
Deaths
0
Injuries
0
Property damage
$40,000
County
Okfuskee County
Touchdown point
35.340, -96.309
Lift-off point
35.460, -96.136
Record number
1005101745-01

What the Weather Service recorded

Severe thunderstorms developed along and ahead of a dry line over central Oklahoma during the afternoon hours. Very unstable air along with very strong low level wind shear resulted in a number of supercell thunderstorms. These storms produced numerous tornadoes, very large hail, and damaging wind gusts as they moved eastward across eastern Oklahoma during the evening hours.

A tornado moved into southwestern Okfuskee County from Seminole County. The tornado snapped or uprooted numerous trees and blew down power poles in Okfuskee County. The estimated peak wind in this segment of the tornado's path based on this damage was 95 mph.

A tornado developed south of Okemah, moved east-northeast for several miles then curved to the northeast moving over the south and east side of Clearview before dissipating north of I-40 north of Pharoah. The tornado damaged homes, destroyed outbuildings, snapped or uprooted numerous trees, and blew down power poles. The estimated peak wind in the tornado based on this damage was 105 mph.

A tornado removed a large section of the roof of the Boley Police Department, damaged homes, snapped or uprooted numerous trees and blew down power poles. The estimated peak wind in the tornado based on this damage was 105 mph.

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

The warnings

25 minutes of warning. NWS TSA issued a tornado warning for this county at 23:20 UTC, 25 minutes before the tornado touched down, in force until 00:00 UTC.

The county was under a tornado watch, issued at 18:27 UTC and running to 02:19 UTC.

Issued (UTC)ExpiredProductOffice
18:27 UTC02:19 UTCTornado WatchTSA
23:02 UTC00:00 UTCSevere Thunderstorm WarningTSA
23:20 UTC00:00 UTCTornado WarningTSA
23:38 UTC00:45 UTCSevere Thunderstorm WarningTSA
23:53 UTC00:31 UTCTornado WarningTSA
00:02 UTC00:30 UTCTornado WarningTSA
00:28 UTC01:15 UTCTornado WarningTSA

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 High Risk, with a 0.30 chance of a tornado within 25 miles, in the hatched area where significant tornadoes were expected. The outlook in force was issued at 19:59 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.

Norman, OK (KOUN), 12:00Z

11.8 hours before the tornado, 109 km from the path. May 10, 2010.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 12:00Z on 2010-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 53 joules per kilogram, CIN -331, lifted condensation level 442 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Norman, OK at 12:00Z on 2010-05-10The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 640 square meters per square second, 0 to 6 km bulk shear 55 knots.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
53 J/kg
Mixed-layer CIN
-331 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
442 m above ground
0-6 km bulk shear
55 kt
0-1 km bulk shear
46 kt
0-1 km storm-relative helicity
640 m²/s²
0-3 km storm-relative helicity
652 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.3
0-3 km lapse rate
4.0 K/km

Open this sounding in Storm Lab

Norman, OK (KOUN), 00:00Z

0.2 hours after it, 109 km from the path. May 11, 2010.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2010-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 1789 joules per kilogram, CIN -99, lifted condensation level 1693 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Norman, OK at 00:00Z on 2010-05-11The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 269 square meters per square second, 0 to 6 km bulk shear 76 knots.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
1789 J/kg
Mixed-layer CIN
-99 J/kg
Surface CAPE
2741 J/kg
Mixed-layer LCL
1693 m above ground
0-6 km bulk shear
76 kt
0-1 km bulk shear
37 kt
0-1 km storm-relative helicity
269 m²/s²
0-3 km storm-relative helicity
259 m²/s²
Significant tornado parameter
0.7
Supercell composite
6.2
0-3 km lapse rate
5.6 K/km

Open this sounding in Storm Lab

The radar

The Norman radar (KTLX), 96 km away, was scanning. The volume nearest the touchdown began at 23:45 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)ReportWhereCountyRemark
23:05 UTCTORNADO7 W SeminolePottawatomie, OKLOCATION ESTIMATED BY EMERGENCY MANAGER WHO VIEWED THE TORNADO.
23:20 UTCTORNADO1 N SeminoleSeminole, OKLARGE TORNADO REPORTED BY THE VORTEX TEAMS CROSSING JUST NORTH OF SEMINOLE.
23:34 UTCHAIL 1BeardenOkfuskee, OKFEW HAIL STONES. SOME THE SIZE OF QUARTERS.
23:37 UTCTORNADO1 W BeardenOkfuskee, OKTORNADO OBSERVED BY EM ON GROUND COMING INTO OKFUSKE COUNTY FROM CROMWELL AREA. TORNADO LIFTED ABOUT 1 MILE WEST AND 1/4 MILE SOUTH. NO OTHER SIGNIFICANT DAMAGE UNTIL IT CROSSED THE RIVER TO THE EAST.
23:50 UTCHAIL 1MeekerLincoln, OKRADAR ESTIMATED TIME
23:55 UTCTSTM WND GST 593 E OkemahOkfuskee, OKOKEMAH MESONET...ENDING AT 655 PM
00:03 UTCTORNADOBryantOkmulgee, OKLARGE TORNADO REPORTED ON THE GROUND NEAR BRYANT
00:12 UTCTORNADO2 Se HenryettaOkmulgee, OKTORNADO REPORTED ON GROUND JUST NORTH OF TURNPIKE SOUTHEAST OF HENRYETTA
00:15 UTCHAIL 1.752 S HenryettaOkmulgee, OK
00:20 UTCTSTM WND DMGMaudPottawatomie, OKSHINGLES BLOWN OFF ROOF AND TREE LIMBS DOWN. ALSO QUARTER SIZE HAIL REPORTED. APPROXIMATE TIME.
00:20 UTCHAIL 1MaudPottawatomie, OKAPPROXIMATE TIME. ALSO SHINGLES BLOWN OFF ROOF AND TREE LIMBS BLOWN DOWN.
00:20 UTCTORNADO1 S BoleyOkfuskee, OKNWS STORM SURVEY CONFIRMS A TORNADO THAT BEGAN 1 MILE SOUTH OF BOLEY AND ENDED 10.5 MILES NORTH NORTHEAST OF OKEMAH. THE MAXIMUM PATH WIDTH WAS 650 YARDS AND THE PATH LENGTH WAS 15.5 MILES.
00:24 UTCTSTM WND DMG3 N CastleOkfuskee, OKDAMAGE TO TREES AND STRUCTURES NEAR IXL. PROBABLE TORNADO.
00:26 UTCTORNADOPierceMcintosh, OKTORNADO REPORTED BY NEWS MEDIA. LOCATIONS APPROXIMATE.
00:30 UTCHAIL 0.751 Se CastleOkfuskee, OKALSO ESTIMATED WINDS TO 50 MILES AN HOUR AND OBSERVED A FUNNEL CLOUD AND POSSIBLE BRIEF TORNADO TO THE NORTHWEST.
00:35 UTCHAIL 2.75Council HillMcintosh, OK
00:40 UTCTORNADO2 S RentiesvilleMcintosh, OKTORNADO REPORTED 2 SOUTH OF RENTIESVILLE. RAIN WRAPPED.
00:43 UTCTORNADO7 Ne OkemahOkfuskee, OKTORNADO SIGHTED AND TREES DOWN. RELAYED FROM OUN.
01:15 UTCTSTM WND DMG7 Wsw ArpelarPittsburg, OKSEVERAL TREES BLOWN DOWN.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

This ground now

The live radar over the trackEvery 2010 tornado in OklahomaEvery tornado in Oklahoma since 1950Warnings in force in Oklahoma nowThe forecast where you are

The other tornadoes of May 10, 2010

70 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
May 101:27 PM CDTEF1Wichita, KS0.925$5,000
May 101:31 PM CDTEF0Wichita, KS1.325
May 101:50 PM CDTEF0Logan, KS1.625
May 102:00 PM CDTEF0Scott, KS0.125
May 102:18 PM CDTEF0Logan, KS2.225
May 102:22 PM CDTEF0Logan, KS1.325
May 103:08 PM CDTEF0Ness, KS0.325
May 103:33 PM CDTEF0Grant, OK0.520
May 103:38 PM CDTEF3Grant, OK to KS40.71,5002$125,000
May 103:39 PM CDTEF0Grant, OK0.330
May 104:03 PM CDTEF0Grant, OK0.330
May 104:12 PM CDTEF0Kingman, KS2.7125
May 104:15 PM CDTEF1Grant, OK5.0500
May 104:17 PM CDTEF1Kay, OK6.7400
May 104:21 PM CDTEF0Kay, OK0.850
May 104:34 PM CDTEF2Kingman, KS3.1700$125,000
May 104:44 PM CDTEF1Kingman, KS1.8300
May 104:46 PM CDTEF0Kingfisher, OK6.730
May 104:46 PM CDTEF0Canadian, OK0.230
May 104:46 PM CDTEF0Canadian, OK4.040
May 104:49 PM CDTEF1Cowley, KS1.4300$200,000
May 104:53 PM CDTEF0Noble, OK0.520
May 104:58 PM CDTEF1Sedgwick, KS5.1300$50,000
May 105:00 PM CDTEF1Noble, OK21.02,460$50,000
May 105:02 PM CDTEF1Noble, OK1.540
May 105:05 PM CDTEF1Jefferson, OK5.050
May 105:08 PM CDTEF1Cowley, KS0.7150$15,000
May 105:13 PM CDTEF0Oklahoma, OK0.220
May 105:20 PM CDTEF1Stephens, OK6.3700
May 105:20 PM CDTEF4Moore–Choctaw tornado, OK24.02,000249
May 105:22 PM CDTEF1Cleveland, OK3.8250
May 105:27 PM CDTEF1Cleveland, OK0.550
May 105:28 PM CDTEF0Elk, KS0.375
May 105:32 PM CDTEF4Norman–Lake Thunderbird tornado, OK22.3880132
May 105:33 PM CDTEF0Osage, OK0.175
May 105:34 PM CDTEF1Cleveland, OK5.5250
May 105:36 PM CDTEF1McClain, OK4.6880
May 105:37 PM CDTEF0McClain, OK0.8150
May 105:39 PM CDTEF2Cleveland, OK17.44403
May 105:41 PM CDTEF0Osage, OK1.050
May 105:44 PM CDTEF0Jefferson, OK1.530
May 105:45 PM CDTEF0Osage, OK1.075
May 105:48 PM CDTEF3Pottawatomie, OK6.58803
May 105:50 PM CDTEF0Stephens, OK2.050
May 105:56 PM CDTEF3Pottawatomie, OK37.22,20028$15,000
May 106:04 PM CDTEF2Carter, OK4.5400
May 106:22 PM CDTEF3Carter, OK4.9400
May 106:25 PM CDTEF0Carter, OK0.530
May 106:52 PM CDTEF0Cleveland, OK2.080
May 106:54 PM CDTEF1Love, OK2.0200
May 107:03 PM CDTEF0Okmulgee, OK0.5100$1,000
May 107:04 PM CDTEF2Okmulgee, OK12.01,250$150,000
May 107:08 PM CDTEF0Marshall, OK0.740
May 107:15 PM CDTEF0Marshall, OK0.640
May 107:16 PM CDTEF2McIntosh, OK1.8300$40,000
May 107:17 PM CDTEF1Okfuskee, OK15.5650$40,000
May 107:23 PM CDTEF2McIntosh, OK13.0800$125,000
May 107:25 PM CDTEF0McIntosh, OK0.4100
May 107:28 PM CDTEF1McIntosh, OK2.6600$3,000
May 107:30 PM CDTEF1McIntosh, OK1.0300$2,000

All 71 of them

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.