Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 13, NWS Norman, OK

April 8, 20114 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 8, 2011, 7:41 PM CDT for 4 counties in Oklahoma. It was in force for 79 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
Apr 8, 2011, 7:41 PM CDT (00:41 UTC)
Expired
Apr 8, 2011, 9:00 PM CDT
In force
79 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Dewey County, OK, Major County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 67 km from the middle of the area, began a volume at 00:43 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Apr 8, 5:35 PM CDTTornado WatchSPC9 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 0.7 hours before the alert went out and 112 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, Lamont, OK at 00:00Z on 2011-04-09Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lamont, OK at 00:00Z on 2011-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.1939587897117Sfc1 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
3252 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
80 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.

945 
WUUS54 KOUN 090041
SVROUN
OKC043-093-151-153-090200-
/O.NEW.KOUN.SV.W.0013.110409T0041Z-110409T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
741 PM CDT FRI APR 8 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN DEWEY COUNTY IN NORTHWEST OKLAHOMA...
  WESTERN MAJOR COUNTY IN NORTHWEST OKLAHOMA...
  SOUTHEASTERN WOODS COUNTY IN NORTHWEST OKLAHOMA...
  SOUTHEASTERN WOODWARD COUNTY IN NORTHWEST OKLAHOMA...

* UNTIL 900 PM CDT

* AT 741 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM NEAR SEILING...MOVING NORTHEAST AT 25 MPH.

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

* LOCATIONS IN THE WARNING INCLUDE CHESTER...CLEO SPRINGS...
  ORIENTA...ORION AND SEILING.

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 3652 9853 3647 9852 3647 9841 3638 9841
      3617 9857 3617 9864 3610 9884 3612 9901
      3618 9908 3660 9897
TIME...MOT...LOC 0041Z 224DEG 20KT 3618 9893

$$

BURKE
3 follow-up statements
019 
WWUS54 KOUN 090105
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
805 PM CDT FRI APR 8 2011

OKC043-090113-
/O.CAN.KOUN.SV.W.0013.000000T0000Z-110409T0200Z/
DEWEY OK-
805 PM CDT FRI APR 8 2011

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR NORTHERN
DEWEY COUNTY...

LAT...LON 3652 9853 3647 9852 3647 9841 3638 9841
      3617 9857 3618 9876 3622 9894 3628 9905
      3660 9897
TIME...MOT...LOC 0103Z 220DEG 18KT 3627 9885

$$

OKC093-151-153-090200-
/O.CON.KOUN.SV.W.0013.000000T0000Z-110409T0200Z/
WOODWARD OK-WOODS OK-MAJOR OK-
805 PM CDT FRI APR 8 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR WESTERN MAJOR...SOUTHEASTERN WOODS AND EASTERN WOODWARD
COUNTIES...

AT 803 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM 4 MILES NORTHEAST OF CHESTER...MOVING NORTHEAST AT 20 
MPH. AT 750 PM...A TRAINED STORM SPOTTER REPORTED GOLF BALL SIZE 
HAIL 2 MILES SOUTH OF CHESTER.

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

* LOCATIONS IN THE WARNING INCLUDE CHESTER...CLEO SPRINGS...
  ORIENTA...ORION AND WAYNOKA.

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 3652 9853 3647 9852 3647 9841 3638 9841
      3617 9857 3618 9876 3622 9894 3628 9905
      3660 9897
TIME...MOT...LOC 0103Z 220DEG 18KT 3627 9885

$$

BURKE
324 
WWUS54 KOUN 090115
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
815 PM CDT FRI APR 8 2011

OKC153-090125-
/O.CAN.KOUN.SV.W.0013.000000T0000Z-110409T0200Z/
WOODWARD OK-
815 PM CDT FRI APR 8 2011

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR EASTERN
WOODWARD COUNTY...

LAT...LON 3652 9853 3647 9852 3647 9841 3638 9841
      3621 9860 3620 9876 3625 9888 3634 9888
      3656 9883
TIME...MOT...LOC 0115Z 220DEG 18KT 3632 9880

$$

OKC093-151-090200-
/O.CON.KOUN.SV.W.0013.000000T0000Z-110409T0200Z/
WOODS OK-MAJOR OK-
815 PM CDT FRI APR 8 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR WESTERN MAJOR AND SOUTHEASTERN WOODS COUNTIES...

AT 815 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM 6 MILES NORTH OF ORION...MOVING NORTHEAST AT 20 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
WIND GUSTS TO 60 MPH...

* LOCATIONS IN THE WARNING INCLUDE CLEO SPRINGS...ORIENTA AND ORION.

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 3652 9853 3647 9852 3647 9841 3638 9841
      3621 9860 3620 9876 3625 9888 3634 9888
      3656 9883
TIME...MOT...LOC 0115Z 220DEG 18KT 3632 9880

$$

BURKE
004 
WWUS54 KOUN 090151
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
851 PM CDT FRI APR 8 2011

OKC093-151-090201-
/O.EXP.KOUN.SV.W.0013.000000T0000Z-110409T0200Z/
WOODS OK-MAJOR OK-
851 PM CDT FRI APR 8 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN MAJOR AND SOUTHEASTERN
WOODS COUNTIES WILL EXPIRE AT 900 PM CDT...

THE STORM HAS WEAKENED... BUT SMALL HAIL AND GUSTY WINDS MAY STILL
OCCUR.

LAT...LON 3652 9853 3647 9852 3647 9841 3638 9841
      3621 9860 3620 9876 3625 9888 3634 9888
      3656 9883
TIME...MOT...LOC 0151Z 220DEG 18KT 3646 9866

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 8, 7:12 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant, Major78 min
Apr 8, 7:32 PM CDTSpecial Weather StatementOUNMajor28 min
Apr 8, 7:56 PM CDTSevere Thunderstorm WarningOUNGrant, Kay34 min
Apr 8, 8:33 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Grant57 min
Apr 8, 9:09 PM CDTTornado WarningOUNGrant36 min
Apr 8, 9:42 PM CDTSevere Thunderstorm WarningOUNGrant, Kay48 min
Apr 8, 10:25 PM CDTSevere Thunderstorm WarningOUNKay65 min
Apr 8, 11:14 PM CDTTornado WarningOUNKay46 min
Apr 8, 11:31 PM CDTSevere Thunderstorm WarningOUNKay26 min
Apr 9, 5:24 AM CDTRed Flag WarningOUNBeckham, Custer, Dewey, Ellis, Greer, Harmon and 8 more15 hr
Apr 9, 3:03 PM CDTWind AdvisoryOUNAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 27 more29 hr
Apr 9, 3:18 PM CDTRed Flag WarningOUNAlfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 36 more30 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.