Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 32, NWS Norman, OK

May 21, 2011Johnston County, Murray County, Pontotoc County, Oklahoma

NWS Norman, OK issued this tornado warning at May 21, 2011, 7:40 PM CDT for Johnston County, Murray County, Pontotoc County, Oklahoma. It was in force for 31 min. 1 report 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
May 21, 2011, 7:40 PM CDT (00:40 UTC)
Expired
May 21, 2011, 8:11 PM CDT
In force
31 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), 98 km from the middle of the area, began a volume at 00:40 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
May 21, 7:40 PM CDTTORNADO1 Ese Hickory, OKMULTIPLE REPORTS

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
May 21, 7:08 PM CDTTornado WatchSPC3 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.7 hours before the alert went out and 95 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 2011-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1388 joules per kilogram.LCLEL10008507005003002001001 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, Norman, OK at 00:00Z on 2011-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 square meters per square second.19395878Sfc1 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
1388 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
2020 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
205 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.5

Open this sounding in Storm Lab

The text

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

080 
WFUS54 KOUN 220040
TOROUN
OKC069-099-123-220130-
/O.NEW.KOUN.TO.W.0032.110522T0040Z-110522T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
740 PM CDT SAT MAY 21 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN PONTOTOC COUNTY IN EAST CENTRAL OKLAHOMA...
  EXTREME NORTHERN JOHNSTON COUNTY IN SOUTHEAST OKLAHOMA...
  EASTERN MURRAY COUNTY IN SOUTHERN OKLAHOMA...

* UNTIL 830 PM CDT

* AT 740 PM CDT...RADAR AND STORM SPOTTERS OBSERVED A TORNADO NEAR
  HICKORY...MOVING EAST AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE FITTSTOWN...HICKORY 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 3470 9657 3449 9655 3451 9688 3458 9689
TIME...MOT...LOC 0040Z 258DEG 11KT 3455 9682

$$


30
2 follow-up statements
897 
WWUS54 KOUN 220054
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
754 PM CDT SAT MAY 21 2011

OKC069-099-220104-
/O.CAN.KOUN.TO.W.0032.000000T0000Z-110522T0130Z/
MURRAY OK-JOHNSTON OK-
754 PM CDT SAT MAY 21 2011

...THE TORNADO WARNING HAS BEEN CANCELLED FOR EXTREME NORTHWESTERN
JOHNSTON AND EASTERN MURRAY COUNTIES...

LAT...LON 3452 9655 3456 9682 3461 9682 3470 9657
TIME...MOT...LOC 0054Z 232DEG 16KT 3461 9675

$$

OKC123-220130-
/O.CON.KOUN.TO.W.0032.000000T0000Z-110522T0130Z/
PONTOTOC OK-
754 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR SOUTHERN
PONTOTOC COUNTY...

AT 754 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES WEST OF
FITTSTOWN...MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE FITTSTOWN.

LAT...LON 3452 9655 3456 9682 3461 9682 3470 9657
TIME...MOT...LOC 0054Z 232DEG 16KT 3461 9675

$$


30
146 
WWUS54 KOUN 220111
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
811 PM CDT SAT MAY 21 2011

OKC123-220120-
/O.CAN.KOUN.TO.W.0032.000000T0000Z-110522T0130Z/
PONTOTOC OK-
811 PM CDT SAT MAY 21 2011

...THE TORNADO WARNING HAS BEEN CANCELLED FOR SOUTHERN PONTOTOC
COUNTY...

THE STORM HAS MOVED OUT OF THE AREA. A TORNADO WARNING DOES CONTINUE 
FOR CENTRAL PONTOTOC COUNTY UNTIL 845 PM FOR A STORM SOUTH OF ADA.

LAT...LON 3452 9655 3456 9682 3461 9682 3470 9657
TIME...MOT...LOC 0110Z 232DEG 16KT 3468 9669

$$


30

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 7:14 PM CDTSpecial Weather StatementOUNPottawatomie31 min
May 21, 7:38 PM CDTSevere Thunderstorm WarningOUNGarvin, McClain, Pontotoc, Pottawatomie, Seminole52 min
May 21, 7:49 PM CDTTornado WarningOUNGarvin, McClain, Pontotoc41 min
May 21, 8:04 PM CDTTornado WarningOUNPontotoc19 min
May 21, 8:24 PM CDTTornado WarningOUNPontotoc51 min
May 21, 9:07 PM CDTTornado WarningOUNPontotoc, Seminole23 min
May 21, 9:29 PM CDTSevere Thunderstorm WarningOUNHughes, Pontotoc, Seminole11 min
May 22, 4:35 PM CDTSpecial Weather StatementOUNLove25 min
May 22, 4:41 PM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Love, Marshall49 min
May 22, 5:15 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Johnston, Love, Murray45 min
May 22, 5:51 PM CDTSevere Thunderstorm WarningOUNCoal, Garvin, Johnston, Murray, Pontotoc, Seminole39 min
May 22, 6:27 PM CDTSevere Thunderstorm WarningOUNCoal, Hughes, Pontotoc, Seminole63 min
May 22, 6:31 PM CDTSevere Thunderstorm WarningOUNJefferson59 min
May 22, 6:36 PM CDTSpecial Weather StatementOUNLove24 min
May 22, 6:55 PM CDTSevere Thunderstorm WarningOUNLove, Marshall50 min

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.