Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 381, NWS Norman, OK

June 11, 2012Wichita County, Texas; Cotton County, Tillman County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 11, 2012, 10:52 PM CDT for Wichita County, Texas; Cotton County, Tillman County, Oklahoma. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 11, 2012, 10:52 PM CDT (03:52 UTC)
Expired: Jun 11, 2012, 11:16 PM CDT
In force: 24 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Cotton County, OK, Tillman County, OK, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 39 km from the middle of the area, began a volume at 03:52 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 3.9 hours before the alert went out and 176 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: 3372 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1193 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 9.7

Open this sounding in Storm Lab

The text

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

558 
WUUS54 KOUN 120352
SVROUN
OKC033-141-TXC485-120445-
/O.NEW.KOUN.SV.W.0381.120612T0352Z-120612T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1052 PM CDT MON JUN 11 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN COTTON COUNTY IN SOUTHWEST OKLAHOMA...
  SOUTHEASTERN TILLMAN COUNTY IN SOUTHWEST OKLAHOMA...
  NORTHERN WICHITA COUNTY IN NORTHERN TEXAS...

* UNTIL 1145 PM CDT

* AT 1048 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS 
  DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR 
  SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS 
  LOCATED NEAR ELECTRA...MOVING EAST AT 25 MPH. 

* LOCATIONS IMPACTED INCLUDE...
  BURKBURNETT...SHEPPARD AFB...IOWA PARK...ELECTRA...GRANDFIELD...
  RANDLETT...DEVOL...COOKIETOWN...HAYNESVILLE AND CASHION. 

THIS INCLUDES INTERSTATE 44 IN OKLAHOMA BETWEEN THE TEXAS STATE LINE 
AND MILE MARKER 12.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE INSIDE A STURDY BUILDING UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3396 9893 3422 9894 3428 9844 3394 9842
TIME...MOT...LOC 0348Z 264DEG 22KT 3408 9883 

$$

...SPEG.

1 follow-up statement

445 
WWUS54 KOUN 120416
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1116 PM CDT MON JUN 11 2012

OKC141-033-TXC485-120455-
/O.CAN.KOUN.SV.W.0381.000000T0000Z-120612T0445Z/
TILLMAN OK-COTTON OK-WICHITA TX-
1116 PM CDT MON JUN 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TILLMAN...
SOUTHWESTERN COTTON AND CENTRAL WICHITA COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAD WEAKENED...AND WAS NO 
LONGER SEVERE. THEREFORE THE WARNING HAS BEEN CANCELLED.  HOWEVER 
GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 3396 9893 3422 9894 3428 9844 3394 9842
TIME...MOT...LOC 0416Z 264DEG 22KT 3408 9883 

$$

..SPEG.

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 Jun 11, 9:33 PM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, Jun 11, 9:33 PM CDT, 1 hour 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
933 PM CDT MON JUN 11 2012

.DISCUSSION...
POPS WERE INCREASED IN SOUTHEAST OKLAHOMA BECAUSE OF INCREASING
SOUTH WINDS OVER THE STATIONARY SURFACE BOUNDARY AND AMPLE
INSTABILITY. THUNDERSTORMS ARE LIKELY TO BECOME MORE COMMON IN
SOUTH CENTRAL AND SOUTHEAST OKLAHOMA. EVENING TEMPERATURES WERE
ADJUSTED SLIGHTLY TO FIT WITH TRENDS.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  68  85  66  86 /  20  20  40  30
HOBART OK         64  87  67  89 /  20  40  40  30
WICHITA FALLS TX  69  88  71  91 /  40  30  50  30
GAGE OK           55  84  62  88 /   0  20  40  30
PONCA CITY OK     60  86  61  86 /   0   0  20  30
DURANT OK         71  87  70  88 /  60  30  40  30

&&

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

09/26

Hazardous weather outlook, Jun 11, 11:55 AM CDT, 10 hours 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT MON JUN 11 2012

OKZ004>048-050>052-TXZ083>090-121100-
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-
1155 AM CDT MON JUN 11 2012

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

.DAY ONE...THROUGH TONIGHT...

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

LOCATION...
THE SLIGHT RISK AREA IS EAST OF A LINE FROM STROUD...TO NORMAN...
TO DUNCAN...TO HENRIETTA TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM LATE
THIS AFTERNOON THROUGH EARLY TUESDAY MORNING.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD BE PREPARED FOR POSSIBLE SEVERE WEATHER OPERATIONS
FROM LATE THIS AFTERNOON UNTIL EARLY TUESDAY MORNING.

DISCUSSION...
A WEAK COLD FRONT WILL CONTINUE TO PUSH SLOWLY SOUTHWARD THROUGH
PARTS OF CENTRAL AND SOUTHERN OKLAHOMA AND WESTERN NORTH TEXAS. A
MOIST AIRMASS REMAINS IN PLACE AHEAD OF THE FRONT. STRONG
INSTABILITY IS EXPECTED TO DEVELOP THIS AFTERNOON AS TEMPERATURES
WARM INTO THE 80S AND 90S. HOWEVER...A LAYER OF WARM AIR AT MID
LEVELS WILL LIKELY SUPPRESS THUNDERSTORM DEVELOPMENT FOR MUCH OF THE
DAY. IF AFTERNOON HEATING AND CONVERGENCE ALONG THE FRONT ARE ABLE
TO OVERCOME THE CAP...THE RESULTING STORMS WILL BE CAPABLE OF
PRODUCING HAIL TO THE SIZE OF BASEBALLS...AND STRONG WIND GUSTS TO
65 MPH.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY JUN 12.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...20 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...80 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
A RISK OF SEVERE STORMS WILL CONTINUE TUESDAY AND TUESDAY NIGHT
ACROSS WEST-CENTRAL AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
STRONG STORMS WILL BE POSSIBLE YET AGAIN ON WEDNESDAY...THROUGHOUT
OKLAHOMA AND NORTH TEXAS. A SLIGHT CHANCE OF THUNDERSTORMS WILL
CONTINUE ON THURSDAY.

OTHER HAZARDOUS WEATHER...
NONE.

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

CMS/II

In the hours before

Local storm report, Jun 11, 10:04 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1004 PM CDT MON JUN 11 2012

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

0930 PM     HAIL             LONE GROVE              34.17N 97.26W
06/11/2012  E1.50 INCH       CARTER             OK   TRAINED SPOTTER

0930 PM     HAIL             3 SW ARDMORE            34.14N 97.17W
06/11/2012  E1.00 INCH       CARTER             OK   TRAINED SPOTTER

&&

DW

Local storm report, Jun 11, 10:09 PM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1009 PM CDT MON JUN 11 2012

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

1005 PM     HAIL             3 E SCOTLAND            33.66N 98.42W
06/11/2012  E0.88 INCH       CLAY               TX   EMERGENCY MNGR

            DEER CREEK IN CLAY COUNTY

&&

DW

Local storm report, Jun 11, 10:23 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1023 PM CDT MON JUN 11 2012

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

1023 PM     HAIL             HENRIETTA               33.82N 98.19W
06/11/2012  E0.88 INCH       CLAY               TX   EMERGENCY MNGR

&&

DW

Local storm report, Jun 11, 10:27 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1027 PM CDT MON JUN 11 2012

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

1026 PM     HAIL             HENRIETTA               33.82N 98.19W
06/11/2012  E1.00 INCH       CLAY               TX   EMERGENCY MNGR

&&

DW

Special weather statement, Jun 11, 10:32 PM CDT, 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1032 PM CDT MON JUN 11 2012

OKZ043-047-048-120400-
JOHNSTON OK-ATOKA OK-COAL OK-
1032 PM CDT MON JUN 11 2012

...SIGNIFICANT WEATHER ADVISORY FOR JOHNSTON...NORTHWESTERN ATOKA
AND SOUTHWESTERN COAL COUNTIES UNTIL 1100 PM CDT...

AT 1028 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING
FROM COALGATE TO 5 MILES NORTHWEST OF RAVIA...MOVING EAST AT 30 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LOCATIONS IMPACTED INCLUDE...
TISHOMINGO...ATOKA...COALGATE...MANNSVILLE...RAVIA...WAPANUCKA...
STRINGTOWN...MILL CREEK...LEHIGH...MILBURN...BROMIDE...PHILLIPS...
CLARITA...OLNEY...COLEMAN...CONNERVILLE...FILLMORE...PONTOTOC...
REAGAN AND RUSSETT.

LAT...LON 3456 9567 3418 9655 3417 9693 3445 9682
      3450 9660 3450 9651 3453 9649 3459 9628
      3459 9567
TIME...MOT...LOC 0328Z 267DEG 25KT 3453 9614 3425 9683

..SPEG.

Special weather statement, Jun 11, 10:40 PM CDT, 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1040 PM CDT MON JUN 11 2012

OKZ046-120415-
CARTER OK-
1040 PM CDT MON JUN 11 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CARTER COUNTY
UNTIL 1115 PM CDT...

AT 1038 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTHEAST
OF WILSON... MOVING EAST AT 20 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LOCATIONS IMPACTED INCLUDE...
ARDMORE...LONE GROVE...SPRINGER...OVERBROOK AND LAKE MURRAY.

LAT...LON 3409 9742 3427 9743 3433 9706 3407 9705
      3407 9712
TIME...MOT...LOC 0338Z 266DEG 16KT 3418 9736

..SPEG.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 8:15 PM CDT	Special Weather Statement	OUN	Archer	30 min
Jun 11, 8:26 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	64 min
Jun 11, 9:09 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	51 min
Jun 11, 10:01 PM CDT	Severe Thunderstorm Warning	OUN	Clay	59 min
Jun 12, 8:27 AM CDT	Special Weather Statement	OUN	Hardeman	48 min
Jun 12, 9:18 AM CDT	Special Weather Statement	OUN	Foard	27 min
Jun 12, 9:48 AM CDT	Special Weather Statement	OUN	Baylor	27 min
Jun 12, 10:14 AM CDT	Special Weather Statement	OUN	Baylor	31 min
Jun 12, 10:45 AM CDT	Special Weather Statement	OUN	Archer	30 min
Jun 11, 8:58 PM CDT	Special Weather Statement	OUN	Carter	17 min
Jun 11, 9:20 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love	40 min
Jun 11, 9:36 PM CDT	Special Weather Statement	OUN	Coal	24 min
Jun 11, 9:59 PM CDT	Severe Thunderstorm Warning	OUN	Love	61 min
Jun 11, 10:02 PM CDT	Special Weather Statement	OUN	Atoka	28 min
Jun 11, 10:32 PM CDT	Special Weather Statement	OUN	Coal, Johnston	28 min
Jun 11, 10:40 PM CDT	Special Weather Statement	OUN	Carter	35 min
Jun 11, 11:08 PM CDT	Special Weather Statement	OUN	Stephens	37 min
Jun 11, 11:30 PM CDT	Severe Thunderstorm Warning	OUN	Carter	60 min
Jun 11, 11:41 PM CDT	Special Weather Statement	OUN	Murray	34 min
Jun 11, 11:42 PM CDT	Special Weather Statement	OUN	Stephens	33 min
Jun 12, 12:03 AM CDT	Special Weather Statement	OUN	Coal	27 min
Jun 12, 12:05 AM CDT	Special Weather Statement	OUN	Bryan	25 min
Jun 12, 12:07 AM CDT	Special Weather Statement	OUN	Murray	23 min
Jun 12, 12:24 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc	42 min
Jun 12, 12:56 AM CDT	Special Weather Statement	OUN	Coal	34 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2012 Severe Thunderstorm Warnings in Texas, 2012 Every severe thunderstorm warning in 2012

Sources

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