Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 61, NWS Norman, OK

April 22, 2011Cotton County, Stephens County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 22, 2011, 8:59 PM CDT for Cotton County, Stephens County, Oklahoma. It was in force for 61 min. 6 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 22, 2011, 8:59 PM CDT (01:59 UTC)
Expired: Apr 22, 2011, 10:00 PM CDT
In force: 61 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Cotton County, OK, Stephens County, OK

The radar

The Altus AFB radar (KFDR), 67 km from the middle of the area, began a volume at 02:00 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Apr 22, 9:05 PM CDT	HAIL 1	3 Nw Walters, OK
Apr 22, 9:07 PM CDT	HAIL 1.75	1 N Cookietown, OK
Apr 22, 9:22 PM CDT	HAIL 1.5	Walters, OK	QUARTER TO PING PONG BALL SIZED HAIL REPORTED.
Apr 22, 9:26 PM CDT	HAIL 1.75	4 W Walters, OK
Apr 22, 9:30 PM CDT	HAIL 2.75	5 W Walters, OK
Apr 22, 9:36 PM CDT	HAIL 1.75	Corum, OK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 6 storm reports to this severe thunderstorm warning; the first came 6 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 22, 3:47 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.0 hours before the alert went out and 195 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1770 J/kg
Mixed-layer CIN: -186 J/kg
Mixed-layer LCL: 2068 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 12.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

014 
WUUS54 KOUN 230159 RRA
SVROUN
OKC033-137-230300-
/O.NEW.KOUN.SV.W.0061.110423T0159Z-110423T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
859 PM CDT FRI APR 22 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN STEPHENS COUNTY IN SOUTHERN OKLAHOMA...
  COTTON COUNTY IN SOUTHWEST OKLAHOMA...

* UNTIL 1000 PM CDT

* AT 858 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM 5 MILES WEST OF WALTERS...MOVING NORTHEAST AT 25 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF GOLF BALLS AND TENNIS BALLS...
WIND GUSTS TO 60 MPH...

* LOCATIONS IN THE WARNING INCLUDE COMANCHE...COOKIETOWN...CORUM...
  EMPIRE CITY...NORTHWESTERN WAURIKA LAKE...TEMPLE AND WALTERS.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 11 AND 24.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

&&

LAT...LON 3436 9860 3446 9833 3445 9830 3447 9829
      3447 9824 3449 9823 3451 9815 3455 9806
      3435 9791 3429 9811 3429 9813 3428 9814
      3418 9842
TIME...MOT...LOC 0158Z 244DEG 22KT 3434 9837

$$

1 follow-up statement

425 
WWUS54 KOUN 230211
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
911 PM CDT FRI APR 22 2011

OKC033-137-230300-
/O.CON.KOUN.SV.W.0061.000000T0000Z-110423T0300Z/
COTTON OK-STEPHENS OK-
911 PM CDT FRI APR 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR SOUTHWESTERN STEPHENS AND NORTHERN COTTON COUNTIES...

AT 909 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE 
THUNDERSTORM CENTERED 5 MILES NORTH OF COOKIETOWN...MOVING NORTHEAST 
AT 5 MPH. HAIL THE SIZE OF TENNIS BALLS IS POSSIBLE WITH THIS STORM.

ANOTHER STORM WAS LOCATED 2 NORTHWEST OF EMPIRE CITY...MOVING TOWARD 
DUNCAN. THIS STORM WILL BE CAPABLE OF PRODUCING HAIL THE SIZE OF 
GOLF BALLS.

ADDITIONAL HAZARDS IN THE WARNING INCLUDE...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

* LOCATIONS IN THE WARNING INCLUDE COMANCHE...COOKIETOWN...CORUM...
  EMPIRE CITY...NORTHWESTERN WAURIKA LAKE...TEMPLE AND WALTERS.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 12 AND 25.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

&&

LAT...LON 3436 9860 3446 9834 3445 9830 3447 9829
      3447 9824 3449 9823 3455 9806 3435 9791
      3429 9811 3429 9813 3428 9814 3421 9843
TIME...MOT...LOC 0209Z 237DEG 6KT 3434 9840

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Apr 22, 7:00 PM CDT, 1 hour 59 minutes earlier.

Area forecast discussion, Apr 22, 7:00 PM CDT, 1 hour 59 minutes before

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

.AVIATION...
23/00Z TAFS...VFR CONDITIONS EXPECTED TO PREVAIL THROUGH THE FIRST 6
TO 9 HOURS...BEFORE MOIST VEERING WIND PROFILE COMMENCES NEAR/NORTH
OF FRONTAL BOUNDARY LATE TONIGHT AND TOMORROW. THIS EXPECTED TO
RESULT IN WIDESPREAD VFR/MARGINAL MVFR CEILINGS LATE TONIGHT AND
TOMORROW NEAR STALLED FRONT...PRIMARILY ALL BUT FAR NORTHWEST
OKLAHOMA TERMINALS. WILL MINIMIZE USE OF RA/TSRA FOR TOMORROW.

WILL INCLUDE CB IN KOKC/KOUN DUE TO PROXIMITY TO STORMS SE OF
TERMINALS. STORMS WILL ALSO AFFECT KSPS FOR THE FIRST HOUR OR SO OF
FORECAST.

&&

.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, 7:20 PM CDT, 1 hour 39 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
720 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-
720 PM CDT FRI APR 22 2011

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

.DAY ONE...THIS EVENING 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 AIR AHEAD OF A NEARLY STATIONARY FRONT STRETCHED
FROM ALTUS... TO CHICKASHA... TO CHANDLER HAVE CREATED A VERY
UNSTABLE ATMOSPHERE. THROUGH THIS EVENING...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. IF A LARGE NUMBER OF STORMS IS ABLE TO
PERSIST...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...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...100 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

Local storm report, Apr 22, 8:02 PM CDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
802 PM CDT FRI APR 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0739 PM     HAIL             2 W LINDSAY             34.84N 97.64W
04/22/2011  E2.75 INCH       GARVIN             OK   PUBLIC

            DELAYED PUBLIC REPORT...HAIL FOR 15 MINUTES WITH GOLFBALL
            TO BASEBALL SIZED HAIL.

0755 PM     HAIL             2 S LINDSAY             34.81N 97.61W
04/22/2011  E1.75 INCH       GARVIN             OK   PUBLIC

&&

BAIN

Local storm report, Apr 22, 8:03 PM CDT, 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
803 PM CDT FRI APR 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0740 PM     HAIL             1 SW DEAN               33.92N 98.38W
04/22/2011  E2.25 INCH       CLAY               TX   PUBLIC

&&

CM

Local storm report, Apr 22, 8:06 PM CDT, 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
806 PM CDT FRI APR 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0804 PM     TORNADO          2 SE BYARS              34.85N 97.03W
04/22/2011                   GARVIN             OK   NWS EMPLOYEE

            TORNADO AT US HWY 177 AND STATE HWY 59

&&

CM

Local storm report, Apr 22, 8:09 PM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
809 PM CDT FRI APR 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0759 PM     HAIL             5 N HENRIETTA           33.89N 98.19W
04/22/2011  E1.00 INCH       CLAY               TX   PUBLIC

&&

CM

Local storm report, Apr 22, 8:26 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
826 PM CDT FRI APR 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0811 PM     HAIL             BRAY                    34.64N 97.82W
04/22/2011  E1.75 INCH       STEPHENS           OK   BROADCAST MEDIA

            REPORT RELAYED THROUGH MEDIA.

&&

BAIN

Local storm report, Apr 22, 8:31 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
831 PM CDT FRI APR 22 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0828 PM     TSTM WND DMG     1 NW STRATFORD          34.81N 96.97W
04/22/2011                   GARVIN             OK   TRAINED SPOTTER

            REPORTS OF DOWNED TELEPHONE POLE AND OVERTURNED TRACTOR
            TRAILER NEAR STRATFORD.

&&

MA

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 22, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, McClain, Pontotoc, Pottawatomie, Seminole	60 min
Apr 22, 7:06 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens	39 min
Apr 22, 7:20 PM CDT	Special Weather Statement	OUN	McClain	10 min
Apr 22, 7:26 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain	34 min
Apr 22, 7:30 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	45 min
Apr 22, 7:34 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Stephens	15 min
Apr 22, 7:45 PM CDT	Tornado Warning	OUN	Garvin, McClain, Pontotoc, Pottawatomie, Seminole	45 min
Apr 22, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain, Pontotoc, Pottawatomie, Seminole and 1 more	61 min
Apr 22, 8:09 PM CDT	Tornado Warning	OUN	Garvin, Pontotoc	36 min
Apr 22, 8:14 PM CDT	Flash Flood Warning	OUN	Garvin, McClain, Pottawatomie	3 hr
Apr 22, 8:14 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	46 min
Apr 22, 8:19 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Stephens	41 min
Apr 22, 8:44 PM CDT	Tornado Warning	OUN	Pontotoc	31 min
Apr 22, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	34 min
Apr 22, 8:59 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Garvin, Grady, Hughes, Murray, Pontotoc and 2 more	61 min
Apr 22, 9:13 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	32 min
Apr 22, 9:29 PM CDT	Areal Flood Advisory	OUN	Garvin, Grady, Pontotoc, Stephens	3 hr
Apr 22, 9:37 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes	53 min
Apr 22, 9:41 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	64 min
Apr 22, 9:50 PM CDT	Flash Flood Warning	OUN	Cotton	4 hr
Apr 22, 9:58 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens	47 min
Apr 22, 9:58 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Johnston, Murray, Pontotoc	62 min
Apr 22, 10:18 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, Grady, McClain, Stephens	57 min
Apr 22, 10:30 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	43 min
Apr 22, 10:41 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens	49 min
Apr 22, 11:06 PM CDT	Severe Thunderstorm Warning	OUN	Pontotoc	54 min
Apr 22, 11:22 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Pottawatomie	53 min
Apr 22, 11:29 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Comanche, Cotton, Garvin, Jefferson, Stephens	61 min
Apr 22, 11:34 PM CDT	Special Weather Statement	OUN	Atoka	26 min
Apr 22, 11:49 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Pontotoc, Pottawatomie	56 min
Apr 23, 12:13 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pottawatomie, Seminole	33 min
Apr 23, 12:29 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady, Stephens	46 min
Apr 23, 12:32 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc	19 min
Apr 23, 12:56 AM CDT	Special Weather Statement	OUN	Coal	19 min
Apr 23, 1:14 AM CDT	Special Weather Statement	OUN	Hughes	31 min
Apr 23, 1:40 AM CDT	Special Weather Statement	OUN	Atoka	20 min
Apr 23, 4:58 PM CDT	Special Weather Statement	OUN	Love	17 min
Apr 23, 5:21 PM CDT	Special Weather Statement	OUN	Love	24 min
Apr 23, 5:42 PM CDT	Special Weather Statement	OUN	Love	18 min
Apr 23, 6:05 PM CDT	Special Weather Statement	OUN	Love	10 min
Apr 23, 6:36 PM CDT	Special Weather Statement	OUN	Marshall	9 min
Apr 23, 6:52 PM CDT	Special Weather Statement	OUN	Love	23 min
Apr 23, 6:58 PM CDT	Severe Thunderstorm Warning	OUN	Love	62 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.