Tornadoes and Flash Flood in Oklahoma, April 22, 2011

Name: Tornadoes and Flash Flood in Oklahoma, April 22, 2011
Start: 2011-04-22T16:45
End: 2011-04-22T23:45
Location: Oklahoma

April 22, 2011 · NWS OUN · 52 events in 12 counties and zones

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $18,000
Crop damage: None recorded
Events: 52

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS OUN wrote it up.

A cold front moved slowly southeast before stalling near the I-44 corridor. A dry line stretched just ahead of the front, lying from near Lawton southward into northern Texas, with warm, moist air present ahead of it. By early evening, thunderstorms had developed ahead of these boundaries, just south and east of the Oklahoma City metro area. Large hail was reported with several of the thunderstorms. The development of the low-level jet added to the already sufficient wind shear for supercell thunderstorms, but also aided the low-level rotation in some of the thunderstorms. A couple of short-lived tornadoes were reported over Garvin and McClain counties, with some damage reported. The storms continued to develop through the evening hours, with many of them moving over the same areas. The drought that was in place was helped by the welcome rainfall, although a few areas reported brief flash-flooding.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before the first event at Apr 22, 1:12 PM CST, 3 hours 33 minutes earlier.

Area forecast discussion, Apr 22, 1:12 PM CST, 3 hours 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
212 PM CDT FRI APR 22 2011

.DISCUSSION...
ACTIVE WEATHER PATTERN WILL CONTINUE INTO EARLY NEXT WEEK. COLD
FRONT HAS BEGUN TO SLOW DOWN THIS AFTERNOON CURRENTLY EXTENDING
ACROSS PORTIONS OF CENTRAL AND SOUTHWEST OK. THE FRONT IS EXPECTED
TO EVENTUALLY STALL THIS EVENING. THUNDERSTORMS ARE EXPECTED TO
DEVELOP NEAR OR AHEAD OF THE FRONT AND DRYLINE LATE THIS AFTERNOON
AND THIS EVENING. WIND SHEAR AND STRONG INSTABILITY WILL BE
SUFFICIENT FOR SEVERE STORMS TO DEVELOP PRODUCING VERY LARGE HAIL...
STRONG WINDS... AND MAYBE A FEW TORNADOES. MODELS NOW SHOW A SFC LOW
DEVELOPING ALONG THE FRONT TO THE WEST OF THE FA FORCING THE FRONTAL
BOUNDARY TO LIFT BACK NORTH SOME OVERNIGHT. SHOWERS AND
THUNDERSTORMS WILL BE POSSIBLE NORTH OF THE FRONT AS LLJ INCREASES
SPREADING THE MOIST AIR NORTHWARD OVER THE FRONT. A FEW OF THESE
ELEVATED STORMS MAY ALSO BECOME SEVERE PRODUCING LARGE HAIL.

RAIN CHANCES WILL CONTINUE OVER THE WEEKEND BUT THE EXACT LOCATIONS
FOR BEST CHANCES OF PRECIP WILL BE SOMEWHAT DEPENDENT ON WHAT
HAPPENS THE DAY/NIGHT BEFORE AND POSITION OF THE FRONTAL BOUNDARY.
MODELS SHOW THE FRONT MOVING BACK SOUTH SATURDAY BEFORE SLOWING
DOWN/STALLING. HERE THE MODELS BEGIN TO DIFFER WHERE THIS WILL OCCUR
WITH GFS HOLDING THE FRONT A LITTLE BIT FURTHER NORTH IN THE CWA
THAN THE NAM. HOWEVER... SHOWERS AND THUNDERSTORMS WILL REMAIN
POSSIBLE ALONG AND NORTH OF THE FRONT AS IMPULSES MOVE THROUGH THE
SW UPPER FLOW. MODELS SHOW UPPER TROUGH MOVING ACROSS THE SOUTHERN
ROCKIES INTO THE SOUTHERN PLAINS SUNDAY INTO MONDAY. THIS WILL
PROVIDE ADDITIONAL LIFT TO THE REGION FOR RAIN CHANCES TO CONTINUE
INTO EARLY NEXT WEEK. ANOTHER SYSTEM WILL FOLLOW QUICKLY ON ITS
HEELS AFFECTING THE REGION TUESDAY INTO WEDNESDAY. MODELS SHOW UPPER
RIDGING THEN DEVELOPING OVER THE REGION LATE NEXT WEEK. SEVERE
WEATHER WILL REMAIN POSSIBLE OVER THE WEEKEND INTO EARLY NEXT WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  63  70  56  67 /  40  30  50  50
HOBART OK         59  74  51  67 /  20  20  40  30
WICHITA FALLS TX  65  84  61  77 /  40  30  40  30
GAGE OK           45  64  42  62 /  10  10  40  20
PONCA CITY OK     53  64  50  62 /  50  40  50  50
DURANT OK         68  82  65  77 /  50  40  40  30

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

06/25

Hazardous weather outlook, Apr 22, 3:41 PM CST, 1 hour 4 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
441 PM CDT FRI APR 22 2011

OKZ004>048-050>052-TXZ083>090-231000-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
441 PM CDT FRI APR 22 2011

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
OKLAHOMA AND WESTERN NORTH TEXAS THIS AFTERNOON AND TONIGHT.

LOCATION...
THE SLIGHT RISK INCLUDES THE AREA SOUTH AND EAST OF A LINE FROM
STILLWATER TO KINGFISHER TO FREDERICK OKLAHOMA...TO GRAYBACK AND
SEYMOUR TEXAS.

TIMING...
ONE ROUND OF THUNDERSTORMS...PRODUCING THE GREATEST RISK OF SEVERE
WEATHER...IS EXPECTED PRIOR TO MIDNIGHT. ADDITIONAL THUNDERSTORMS...
CARRYING PRIMARILY A RISK OF LARGE HAIL...MAY FORM AFTER MIDNIGHT.

IMPACTS...
SIGNIFICANT DAMAGE TO AUTOMOBILES...ROOFTOPS...AND VEGETATION FROM
HAIL TO BASEBALL SIZE OR LARGER.

DAMAGING WIND GUSTS TO 70 MPH.

A FEW TORNADOES...MAINLY IN SOUTHERN AND EASTERN PORTIONS OF THE
RISK AREA...TO THE SOUTH AND EAST OF BOTH OKLAHOMA CITY AND WICHITA
FALLS.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS...ESPECIALLY
THROUGH MIDNIGHT.

DISCUSSION...
VERY WARM AND HUMID CONDITIONS AHEAD OF A COLD FRONT STRETCHED FROM
ALTUS... TO OKLAHOMA CITY... TO TULSA HAVE PRODUCED A VERY UNSTABLE
ATMOSPHERE.  ALTHOUGH GULF MOISTURE WILL REMAIN RATHER
SHALLOW...ENOUGH CONVERGENCE ALONG THE FRONT IS EXPECTED TO RESULT
IN SCATTERED THUNDERSTORM DEVELOPMENT LATE THIS AFTERNOON OR EARLY
THIS EVENING.  THESE STORMS ARE EXPECTED TO DEVELOP SOUTH AND EAST
OF BOTH OKLAHOMA CITY AND WICHITA FALLS...WITH MOVEMENT TOWARD THE
EAST. WIND SHEAR IS VERY FAVORABLE FOR SUPERCELLS...WITH THE MAIN
RISK BEING VERY LARGE AND DAMAGING HAIL. TORNADOES ARE ALSO
POSSIBLE... ESPECIALLY OWING TO THE VERY STRONG INSTABILITY...WITH
CAPE VALUES EXCEEDING 4000. THIS INITIAL ACTIVITY MAY PERSIST IN THE
FORM OF SUPERCELLS THROUGH EVENING. IF A LARGE NUMBER OF STORMS IS
ABLE TO DEVELOP...SOME GROWTH INTO A LINE OR CLUSTER MAY OCCUR...AND
THIS WOULD INCREASE THE THREAT OF DAMAGING WINDS ACROSS FAR
SOUTHEAST OKLAHOMA.

THEN...AFTER MIDNIGHT...A SECOND ROUND OF ACTIVITY MAY OCCUR...WHEN
THE LOW LEVEL JET CARRIES UNSTABLE AIR UP TO THE NORTH OF THE SLOW
MOVING FRONT. STORMS ROOTED WELL ABOVE THE SURFACE MAY DEVELOP
TOWARD THE WESTERN AND NORTHERN PORTIONS OF THE SLIGHT RISK AREA...
CARRYING A RISK OF LARGE HAIL...FREQUENT LIGHTNING...AND LOCALLY
HEAVY RAINFALL.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SATURDAY APR 23.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...80 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...80 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

THUNDERSTORM OUTLOOK...
EPISODES OF STRONG TO SEVERE THUNDERSTORMS MAY OCCUR...OFF AND ON...
EACH DAY THROUGH MONDAY. THESE STORMS WILL BE SUPPORTED BY THE
PRESENCE OF A SURFACE FRONTAL BOUNDARY...BENEATH MODERATE
SOUTHWESTERLY FLOW ALOFT...WITH ADEQUATE GULF MOISTURE IN PLACE.

OTHER HAZARDOUS WEATHER...
STRONG LOW PRESSURE WILL DRAG A DRYLINE THROUGH PORTIONS OF THE
REGION ON MONDAY. FIRE WEATHER CONDITIONS MAY BECOME EXTREME BEHIND
THE DRYLINE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY
5 AM SATURDAY.

In the hours before

Special weather statement, Apr 22, 3:50 PM CST, 55 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
450 PM CDT FRI APR 22 2011

OKZ026-222205-
LINCOLN OK-
450 PM CDT FRI APR 22 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR LINCOLN COUNTY.

AT 450 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES SOUTHEAST
OF SPARKS...MOVING EAST-NORTHEAST AT 35 MPH.

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

LAT...LON 3547 9676 3547 9682 3563 9688 3570 9661
      3551 9661 3550 9661

..SPEG.

The radar

The Norman radar (KTLX), 56 km away, was scanning. The volume nearest the first event began at 22:46 UTC.

Open the radar archive at this moment

Event by event

46 hail, 3 tornado, 2 thunderstorm wind, 1 flash flood. Local standard time, as filed.

Hail, Lincoln

When: April 22, 4:45 PM CST
Where: Lincoln County, Prague
Measured: 1 in hail
Reported by: Law Enforcement
Coordinates: 35.490, -96.690

Hail, Garvin

When: April 22, 5:06 PM CST
Where: Garvin County, 3 mi S of Maysville
Measured: 1 in hail
Reported by: Amateur Radio
Coordinates: 34.777, -97.410

Hail, Pottawatomie

When: April 22, 5:15 PM CST
Where: Pottawatomie County, 4 mi W of Tecumseh
Measured: 1.25 in hail
Reported by: Public
Coordinates: 35.260, -97.011

Hail, McClain

When: April 22, 5:18 PM CST
Where: McClain County, 3 mi S of Purcell
Measured: 1.75 in hail
Reported by: Amateur Radio
Coordinates: 34.967, -97.370

The hail was reported near Highway 74.

Hail, Garvin

When: April 22, 5:21 PM CST
Where: Garvin County, 3 mi W of Paoli
Measured: 1.5 in hail
Reported by: Storm Chaser
Coordinates: 34.830, -97.313

Hail, Pottawatomie

When: April 22, 5:38 PM CST
Where: Pottawatomie County, 5.72 mi S of Dale
Measured: 1.25 in hail
Reported by: Public
Coordinates: 35.309, -97.032

The hail was reported at Bethel Acres.

Hail, Pottawatomie

When: April 22, 5:40 PM CST
Where: Pottawatomie County, 2 mi S of Tecumseh
Measured: 2.75 in hail
Reported by: Amateur Radio
Coordinates: 35.231, -96.940

Up to baseball-size hail was reported 2 miles south of State Highway 9 and 2 miles east of Highway 102.

Hail, Pottawatomie

When: April 22, 5:40 PM CST
Where: Pottawatomie County, 1 mi W of Tecumseh
Measured: 1.75 in hail
Reported by: County Official
Coordinates: 35.260, -96.958

Hail, Pottawatomie

When: April 22, 5:42 PM CST
Where: Pottawatomie County, 3 mi E of Pink
Measured: 1.75 in hail
Reported by: Public
Coordinates: 35.260, -97.067

Hail, Garvin

When: April 22, 5:46 PM CST
Where: Garvin County, 8 mi E of Paoli
Measured: 1 in hail
Reported by: NWS Employee
Coordinates: 34.830, -97.119

Hail, Pottawatomie

When: April 22, 5:50 PM CST
Where: Pottawatomie County, 5 mi S of Pink
Measured: 2 in hail
Reported by: Broadcast Media
Coordinates: 35.188, -97.120

Hail, Pottawatomie

When: April 22, 6:04 PM CST
Where: Pottawatomie County, Tecumseh
Measured: 1.25 in hail
Reported by: Public
Coordinates: 35.260, -96.940

Hail, Jefferson

When: April 22, 6:10 PM CST
Where: Jefferson County, 5 mi S of Hastings
Measured: 1.75 in hail
Property damage: $5,000
Reported by: Public
Coordinates: 34.158, -98.110

A sun roof on a residential structure was damaged. Monetary damages were estimated.

Hail, Jefferson

When: April 22, 6:15 PM CST
Where: Jefferson County, Hastings
Measured: 1.75 in hail
Reported by: Public
Coordinates: 34.230, -98.110

Hail, Garvin

When: April 22, 6:30 PM CST
Where: Garvin County, 1 mi W of Lindsay
Measured: 2.75 in hail
Reported by: Public
Coordinates: 34.840, -97.628

Hail, Garvin

When: April 22, 6:39 PM CST
Where: Garvin County, 2 mi W of Lindsay
Measured: 2.75 in hail
Reported by: Public
Coordinates: 34.840, -97.645

Tornado, McClain

When: April 22, 6:45 PM CST to 6:48 PM CST
Where: McClain County, 1 mi WSW of Byars
Rating: EF0
Path length: 0.5 mi
Path width: 150 yd
Reported by: NWS Storm Survey
Coordinates: 34.864, -97.066

Numerous storm chasers observed a tornado just to the west-southwest of Byars. However, no known damage was reported with this tornado.

Hail, Garvin

When: April 22, 6:55 PM CST
Where: Garvin County, 2 mi S of Lindsay
Measured: 1.75 in hail
Reported by: Public
Coordinates: 34.811, -97.610

Hail, Grady

When: April 22, 6:55 PM CST to 7:35 PM CST
Where: Grady County, Cox City
Measured: 2.75 in hail
Property damage: $5,000
Reported by: COOP Observer
Coordinates: 34.730, -97.730

Up to baseball-size hail occurred off and on from 1855 to 1935 cst. Minor roof damage was reported. Monetary damages were estimated.

Tornado, McClain

When: April 22, 6:59 PM CST
Where: McClain County, 1 mi E of Byars
Rating: EF1
Path length: 0.2 mi
Path width: 30 yd
Property damage: $5,000
Reported by: Storm Chaser
Coordinates: 34.870, -97.032

Numerous chasers observed a tornado near state highway 59 to the east of Byars. An outbuilding was damaged by this tornado. Several trees were downed. A downed power line caused the town to be without power for several hours. Monetary damages were estimated.

Tornado, Garvin

When: April 22, 7:02 PM CST to 7:05 PM CST
Where: Garvin County, 4 mi NW of Stratford
Rating: EF0
Path length: 0.4 mi
Path width: 50 yd
Reported by: Storm Chaser
Coordinates: 34.841, -97.010

Numerous storm chasers reported a tornado between Byars and Stratford. No damage was reported with this tornado.

Hail, Stephens

When: April 22, 7:11 PM CST
Where: Stephens County, Bray
Measured: 1.75 in hail
Reported by: Broadcast Media
Coordinates: 34.640, -97.820

Hail, Stephens

When: April 22, 7:23 PM CST
Where: Stephens County, 4 mi NE of Bray
Measured: 2.5 in hail
Reported by: Amateur Radio
Coordinates: 34.681, -97.770

Thunderstorm Wind, Garvin

When: April 22, 7:28 PM CST
Where: Garvin County, 1 mi NW of Stratford
Measured: 61 kt (70 mph) estimated gust
Property damage: $3,000
Reported by: Trained Spotter
Coordinates: 34.810, -96.972

A telephone pole was downed and a tractor trailer was overturned. Monetary damages were estimated.

Hail, Jefferson

When: April 22, 7:45 PM CST
Where: Jefferson County, Ryan
Measured: 1 in hail
Reported by: Public
Coordinates: 34.020, -97.950

Hail, Cotton

When: April 22, 7:45 PM CST
Where: Cotton County, 6 mi NNW of Cookietown
Measured: 2 in hail
Reported by: CoCoRaHS
Coordinates: 34.350, -98.490

Hail, Cotton

When: April 22, 8:05 PM CST
Where: Cotton County, 3 mi NW of Walters
Measured: 1 in hail
Reported by: Amateur Radio
Coordinates: 34.381, -98.347

Hail, Cotton

When: April 22, 8:07 PM CST
Where: Cotton County, 1 mi N of Cookietown
Measured: 1.75 in hail
Reported by: Amateur Radio
Coordinates: 34.285, -98.450

Hail, Garvin

When: April 22, 8:09 PM CST
Where: Garvin County, 3 mi S of Lindsay
Measured: 1.75 in hail
Reported by: Amateur Radio
Coordinates: 34.797, -97.610

Hail, Stephens

When: April 22, 8:09 PM CST
Where: Stephens County, 4 mi NE of Bray
Measured: 1.75 in hail
Reported by: Amateur Radio
Coordinates: 34.681, -97.770

Hail, Grady

When: April 22, 8:10 PM CST
Where: Grady County, Cox City
Measured: 0.75 in hail
Reported by: COOP Observer
Coordinates: 34.730, -97.730

Hail, Stephens

When: April 22, 8:13 PM CST
Where: Stephens County, 2 mi W of Duncan
Measured: 1.25 in hail
Reported by: Amateur Radio
Coordinates: 34.500, -97.995

Hail, Murray

When: April 22, 8:20 PM CST
Where: Murray County, 8 mi N of Sulphur
Measured: 1.75 in hail
Reported by: Amateur Radio
Coordinates: 34.626, -96.970

Hail, Stephens

When: April 22, 8:20 PM CST
Where: Stephens County, Duncan
Measured: 1.75 in hail
Reported by: Law Enforcement
Coordinates: 34.500, -97.960

The hail was reported over the western side of town.

Hail, Cotton

When: April 22, 8:22 PM CST
Where: Cotton County, Walters
Measured: 1.5 in hail
Reported by: Public
Coordinates: 34.350, -98.310

Hail, Cotton

When: April 22, 8:26 PM CST
Where: Cotton County, 4 mi W of Walters
Measured: 1.75 in hail
Reported by: Broadcast Media
Coordinates: 34.350, -98.380

Hail, Cotton

When: April 22, 8:30 PM CST
Where: Cotton County, 5 mi W of Walters
Measured: 2.75 in hail
Reported by: Amateur Radio
Coordinates: 34.350, -98.398

Hail, Garvin

When: April 22, 8:36 PM CST
Where: Garvin County, 9 mi W of Elmore City
Measured: 1 in hail
Reported by: Amateur Radio
Coordinates: 34.620, -97.558

Hail, Stephens

When: April 22, 8:36 PM CST
Where: Stephens County, Corum
Measured: 1.75 in hail
Reported by: Amateur Radio
Coordinates: 34.360, -98.100

Hail, Stephens

When: April 22, 9:13 PM CST
Where: Stephens County, 2 mi W of Corum
Measured: 1 in hail
Reported by: Amateur Radio
Coordinates: 34.360, -98.135

Hail, Garvin

When: April 22, 9:15 PM CST
Where: Garvin County, Wynnewood
Measured: 1 in hail
Reported by: Fire Department/Rescue
Coordinates: 34.640, -97.160

Hail, Jefferson

When: April 22, 9:40 PM CST
Where: Jefferson County, 3.86 mi NNW of Waurika Lake Dam
Measured: 1 in hail
Reported by: Amateur Radio
Coordinates: 34.290, -98.080

The hail was reported at Waurika Lake.

Flash Flood, Cotton

When: April 22, 9:45 PM CST to 11:45 PM CST
Where: Cotton County, 2.92 mi SSE of Walters Arpt to 1.19 mi NW of Walters
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 34.332, -98.387

Several roadways, including Highway 5 were under water due to very heavy rainfall. The roadways had to be closed for a short time as a result.

Hail, Cotton

When: April 22, 9:45 PM CST
Where: Cotton County, 6 mi NNW of Cookietown
Measured: 0.75 in hail
Reported by: CoCoRaHS
Coordinates: 34.350, -98.490

Hail, Coal

When: April 22, 10:00 PM CST
Where: Coal County, Coalgate
Measured: 0.88 in hail
Reported by: Fire Department/Rescue
Coordinates: 34.540, -96.220

Hail, Cotton

When: April 22, 10:01 PM CST
Where: Cotton County, 2 mi NW of Walters
Measured: 1.25 in hail
Reported by: Amateur Radio
Coordinates: 34.370, -98.335

Hail, Pontotoc

When: April 22, 10:15 PM CST
Where: Pontotoc County, Vanoss
Measured: 1.25 in hail
Reported by: Trained Spotter
Coordinates: 34.760, -96.870

In addition to the hail, wind gusts were estimated around 60 mph.

Thunderstorm Wind, Pontotoc

When: April 22, 10:15 PM CST
Where: Pontotoc County, Vanoss
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 34.760, -96.870

In addition to the estimated wind gust, hail up to half-dollar size was reported.

Hail, Comanche

When: April 22, 10:30 PM CST
Where: Comanche County, Geronimo
Measured: 2 in hail
Reported by: Amateur Radio
Coordinates: 34.480, -98.380

Hail, Garvin

When: April 22, 10:30 PM CST
Where: Garvin County, 1 mi E of Paoli
Measured: 1 in hail
Reported by: Storm Chaser
Coordinates: 34.830, -97.242

Hail, McClain

When: April 22, 11:23 PM CST
Where: McClain County, 2 mi WNW of Byars
Measured: 2 in hail
Reported by: Trained Spotter
Coordinates: 34.881, -97.083

Hail, Stephens

When: April 22, 11:40 PM CST
Where: Stephens County, 8.54 mi WSW of Marlow
Measured: 1.75 in hail
Reported by: Amateur Radio
Coordinates: 34.623, -98.107

The hail was reported on 8-Mile Road west of Central High.

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Oklahoma in 2011 Every state in 2011 This day in weather history The tornado archive for Oklahoma, 2011 Warnings in Oklahoma, April 2011

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 305085, 305034, 305035, 305036, 305037, 305038, 305039, 305040, 305041, 305042, 305043, 305044, 305045, 305046, 305047, 305048, 288894, 305049, 305087, 288896, 288892, 305050, 305051, 305052, 305059, 305089, 305060, 305061, 305062, 305063, 305091, 305064, 305065, 305066, 305067, 305068, 305069, 305070, 305071, 305072, and more.