Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 35, NWS Norman, OK

May 21, 2011Pontotoc County, Oklahoma

NWS Norman, OK issued this tornado warning at May 21, 2011, 8:24 PM CDT for Pontotoc County, Oklahoma. It was in force for 51 min. 4 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
May 21, 2011, 8:24 PM CDT (01:24 UTC)
Expired
May 21, 2011, 9:15 PM CDT
In force
51 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

County Pontotoc County, OK

The radar

The Norman radar (KTLX), 82 km from the middle of the area, began a volume at 01:26 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, 8:30 PM CDTTORNADO8 W Ada, OK
May 21, 8:34 PM CDTTORNADO5 W Ada, OK
May 21, 8:41 PM CDTTORNADO4 Wnw Ada, OK
May 21, 9:00 PM CDTHAIL 21 S Byng, 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
May 21, 7:08 PM CDTTornado WatchSPC3 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.4 hours before the alert went out and 83 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2011-05-22The 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.

314 
WFUS54 KOUN 220124
TOROUN
OKC123-220215-
/O.NEW.KOUN.TO.W.0035.110522T0124Z-110522T0215Z/

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

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL PONTOTOC COUNTY IN EAST CENTRAL OKLAHOMA...

* UNTIL 915 PM CDT

* AT 824 PM CDT...RADAR AND STORM SPOTTERS OBSERVED A TORNADO NEAR
  VANOSS...MOVING EAST AT 25 MPH.

* LOCATIONS IN THE WARNING INCLUDE ADA...BYNG AND VANOSS.

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 3469 9641 3469 9692 3488 9692 3487 9673
      3486 9671 3487 9668 3488 9640
TIME...MOT...LOC 0124Z 271DEG 20KT 3477 9683

$$
WR
6 follow-up statements
040 
WWUS54 KOUN 220134
SVSOUN

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

OKC123-220215-
/O.CON.KOUN.TO.W.0035.000000T0000Z-110522T0215Z/
PONTOTOC OK-
834 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR CENTRAL
PONTOTOC COUNTY...

AT 833 PM CDT...RADAR AND STORM SPOTTERS OBSERVED A TORNADO 4 MILES 
WEST OF ADA...MOVING EAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE ADA...BYNG AND VANOSS.

LAT...LON 3469 9641 3470 9690 3488 9691 3487 9673
      3486 9671 3487 9668 3488 9640
TIME...MOT...LOC 0133Z 260DEG 18KT 3481 9680

$$
WR
546 
WWUS54 KOUN 220137
SVSOUN

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

OKC123-220215-
/O.CON.KOUN.TO.W.0035.000000T0000Z-110522T0215Z/
PONTOTOC OK-
837 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR CENTRAL
PONTOTOC COUNTY...

AT 837 PM CDT...RADAR AND STORM SPOTTERS OBSERVED A TORNADO 4 MILES 
WEST OF ADA...MOVING EAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE ADA...BYNG AND VANOSS.

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 3469 9641 3470 9690 3488 9691 3487 9673
      3486 9671 3487 9668 3488 9640
TIME...MOT...LOC 0137Z 260DEG 18KT 3480 9678

$$
WR
453 
WWUS54 KOUN 220144
SVSOUN

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

OKC123-220215-
/O.CON.KOUN.TO.W.0035.000000T0000Z-110522T0215Z/
PONTOTOC OK-
844 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR CENTRAL
PONTOTOC COUNTY...

AT 844 PM CDT...RADAR AND STORM SPOTTERS OBSERVED A TORNADO 3 MILES
NORTHWEST OF ADA...MOVING EAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE ADA AND BYNG.

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.

TORNADOES ARE ESPECIALLY DANGEROUS AT NIGHT BECAUSE THEY ARE HARD TO
SEE. TAKE COVER NOW. IF A BASEMENT IS NOT AVAILABLE...MOVE TO AN
INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR. LEAVE MOBILE HOMES AND
VEHICLES FOR REINFORCED SHELTER. STAY AWAY FROM WINDOWS.

&&

LAT...LON 3471 9641 3473 9683 3487 9685 3487 9673
      3486 9671 3487 9668 3488 9640
TIME...MOT...LOC 0144Z 255DEG 19KT 3481 9674

$$
WR
450 
WWUS54 KOUN 220151
SVSOUN

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

OKC123-220215-
/O.CON.KOUN.TO.W.0035.000000T0000Z-110522T0215Z/
PONTOTOC OK-
851 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR NORTHERN
PONTOTOC COUNTY...

AT 851 PM CDT...A THUNDERSTORM WITH A HISTORY OF PRODUCING TORNADOES
WAS LOCATED 3 MILES SOUTHWEST OF BYNG...MOVING EAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE BYNG AND THE NORTH SIDE OF ADA.

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.

TORNADOES ARE ESPECIALLY DANGEROUS AT NIGHT BECAUSE THEY ARE HARD TO
SEE. TAKE COVER NOW. IF A BASEMENT IS NOT AVAILABLE...MOVE TO AN
INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR. LEAVE MOBILE HOMES AND
VEHICLES FOR REINFORCED SHELTER. STAY AWAY FROM WINDOWS.

&&

LAT...LON 3479 9641 3479 9677 3487 9679 3487 9673
      3486 9671 3487 9668 3488 9640
TIME...MOT...LOC 0151Z 255DEG 19KT 3483 9670

$$
WR
142 
WWUS54 KOUN 220158
SVSOUN

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

OKC123-220215-
/O.CON.KOUN.TO.W.0035.000000T0000Z-110522T0215Z/
PONTOTOC OK-
858 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR NORTHERN
PONTOTOC COUNTY...

AT 858 PM CDT...A THUNDERSTORM WITH A HISTORY OF PRODUCING TORNADOES
WAS LOCATED NEAR BYNG...MOVING EAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE BYNG.

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 3481 9641 3482 9676 3487 9676 3487 9673
      3486 9671 3487 9668 3488 9640
TIME...MOT...LOC 0158Z 255DEG 19KT 3484 9666

$$
WR
679 
WWUS54 KOUN 220203
SVSOUN

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

OKC123-220215-
/O.CON.KOUN.TO.W.0035.000000T0000Z-110522T0215Z/
PONTOTOC OK-
903 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR NORTHERN
PONTOTOC COUNTY...

AT 903 PM CDT...A THUNDERSTORM WITH A HISTORY OF PRODUCING TORNADOES
WAS LOCATED NEAR BYNG...MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE BYNG.

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 3483 9663 3483 9670 3486 9671 3487 9668
      3488 9656
TIME...MOT...LOC 0203Z 250DEG 18KT 3486 9665

$$
WR

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, 7:40 PM CDTTornado WarningOUNJohnston, Murray, Pontotoc31 min
May 21, 7:49 PM CDTTornado WarningOUNGarvin, McClain, Pontotoc41 min
May 21, 8:04 PM CDTTornado WarningOUNPontotoc19 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.