Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 13, NWS Norman, OK

April 14, 2011Johnston County, Murray County, Pontotoc County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 14, 2011, 7:28 PM CDT for Johnston County, Murray County, Pontotoc County, Oklahoma. It was in force for 47 min. 2 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 14, 2011, 7:28 PM CDT (00:28 UTC)
Expired
Apr 14, 2011, 8:15 PM CDT
In force
47 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Johnston County, OK, Murray County, OK, Pontotoc County, OK

The radar

The Norman radar (KTLX), 107 km from the middle of the area, began a volume at 00:29 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

TimeReportWhereRemark
Apr 14, 7:40 PM CDTTORNADOLake Of The Arbuckles, OKDELAYED REPORT RELAYED THROUGH KFOR.
Apr 14, 8:00 PM CDTHAIL 1.75Mill Creek, OK

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

The watch it was issued in

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

IssuedProductOfficeLasted
Apr 14, 2:28 PM CDTTornado Watch PDSSPC7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.5 hours before the alert went out and 99 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2011-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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.
HodographHodograph, Norman, OK at 00:00Z on 2011-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.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.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
4948 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
146 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

428 
WFUS54 KOUN 150028
TOROUN
OKC069-099-123-150115-
/O.NEW.KOUN.TO.W.0013.110415T0028Z-110415T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
728 PM CDT THU APR 14 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN PONTOTOC COUNTY IN EAST CENTRAL OKLAHOMA...
  NORTHWESTERN JOHNSTON COUNTY IN SOUTHEAST OKLAHOMA...
  SOUTHEASTERN MURRAY COUNTY IN SOUTHERN OKLAHOMA...

* UNTIL 815 PM CDT

* AT 728 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR LAKE OF THE
  ARBUCKLES...MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IN THE WARNING INCLUDE DOUGHERTY...HICKORY...LAKE OF THE
  ARBUCKLES...MILL CREEK...REAGAN...SCULLIN AND SULPHUR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO MAY FORM AT ANYTIME. TAKE COVER NOW. ABANDON MOBILE HOMES
AND VEHICLES. IF POSSIBLE... MOVE TO A BASEMENT OR STORM SHELTER.
OTHERWISE... MOVE TO AN INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR.
STAY AWAY FROM WINDOWS.

&&

LAT...LON 3435 9670 3435 9704 3438 9704 3438 9709
      3448 9714 3464 9678
TIME...MOT...LOC 0028Z 242DEG 25KT 3444 9701

$$
2 follow-up statements
815 
WWUS54 KOUN 150048
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
748 PM CDT THU APR 14 2011

OKC069-099-123-150115-
/O.CON.KOUN.TO.W.0013.000000T0000Z-110415T0115Z/
MURRAY OK-JOHNSTON OK-PONTOTOC OK-
748 PM CDT THU APR 14 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR SOUTHERN
PONTOTOC...NORTHWESTERN JOHNSTON AND SOUTHEASTERN MURRAY COUNTIES...

AT 747 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 3 MILES SOUTHWEST OF 
SCULLIN...MOVING NORTHEAST AT 30 MPH. RADAR ALSO INDICATED 
DEVELOPING ROTATION NORTH OF MILL CREEK IN JOHNSTON COUNTY. 

* LOCATIONS IN THE WARNING INCLUDE HICKORY...MILL CREEK AND SCULLIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. LEAVE MOBILE HOMES AND VEHICLES. IF POSSIBLE...MOVE
TO A BASEMENT OR STORM SHELTER. OTHERWISE MOVE TO AN INTERIOR ROOM OR
HALLWAY ON THE LOWEST FLOOR. STAY AWAY FROM WINDOWS AND OUTSIDE
WALLS.

&&

LAT...LON 3436 9694 3440 9694 3443 9695 3450 9699
      3464 9678 3435 9670
TIME...MOT...LOC 0047Z 242DEG 25KT 3450 9687

$$
686 
WWUS54 KOUN 150113
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
813 PM CDT THU APR 14 2011

OKC069-099-123-150123-
/O.EXP.KOUN.TO.W.0013.000000T0000Z-110415T0115Z/
MURRAY OK-JOHNSTON OK-PONTOTOC OK-
813 PM CDT THU APR 14 2011

...THE TORNADO WARNING FOR SOUTHERN PONTOTOC...NORTHWESTERN JOHNSTON
AND SOUTHEASTERN MURRAY COUNTIES WILL EXPIRE AT 815 PM CDT...

THE STORM HAS MOVED OUT OF THE AREA.

LAT...LON 3436 9694 3440 9694 3443 9695 3450 9699
      3464 9678 3435 9670
TIME...MOT...LOC 0113Z 242DEG 25KT 3439 9663

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 14, 7:13 PM CDTTornado WarningOUNHughes32 min
Apr 14, 7:53 PM CDTSpecial Weather StatementOUNLincoln22 min
Apr 14, 7:54 PM CDTTornado WarningOUNCoal, Johnston, Pontotoc36 min
Apr 14, 7:58 PM CDTTornado WarningOUNAtoka, Coal32 min
Apr 14, 7:59 PM CDTSevere Thunderstorm WarningOUNLincoln, Payne22 min
Apr 14, 8:17 PM CDTTornado WarningOUNAtoka, Coal58 min
Apr 14, 8:17 PM CDTTornado WarningOUNAtoka, Johnston28 min
Apr 14, 8:34 PM CDTTornado WarningOUNAtoka, Coal, Johnston41 min
Apr 14, 8:37 PM CDTSpecial Weather StatementOUNMurray23 min
Apr 14, 8:39 PM CDTSpecial Weather StatementOUNCoal, Hughes21 min
Apr 14, 8:46 PM CDTTornado WarningOUNAtoka, Coal39 min
Apr 14, 8:53 PM CDTAreal Flood AdvisoryOUNAtoka, Coal, Hughes, Murray, Pontotoc3 hr
Apr 14, 8:59 PM CDTSpecial Weather StatementOUNCoal, Hughes, Johnston, Marshall31 min
Apr 14, 9:07 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Carter, Coal, Hughes, Johnston and 3 more53 min
Apr 14, 9:46 PM CDTHigh Wind WarningOUNAlfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 21 more24 hr
Apr 14, 9:55 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Coal, Marshall53 min
Apr 15, 4:12 AM CDTRed Flag WarningOUNBeckham, Caddo, Comanche, Cotton, Custer, Greer and 8 more17 hr
Apr 15, 5:35 PM CDTFreeze WarningOUNAlfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 24 more11 hr

Nearby

Tornado Warnings in Oklahoma, 2011Every tornado warning in 2011Tornadoes 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.