Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 34, NWS Norman, OK

May 21, 2011Pontotoc County, Oklahoma

NWS Norman, OK issued this tornado warning at May 21, 2011, 8:04 PM CDT for Pontotoc County, Oklahoma. It was in force for 19 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: May 21, 2011, 8:04 PM CDT (01:04 UTC)
Expired: May 21, 2011, 8:23 PM CDT
In force: 19 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Pontotoc County, OK

The radar

The Norman radar (KTLX), 88 km from the middle of the area, began a volume at 01:05 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.

Issued	Product	Office	Lasted
May 21, 7:08 PM CDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.1 hours before the alert went out and 87 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: 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.

364 
WFUS54 KOUN 220104
TOROUN
OKC123-220145-
/O.NEW.KOUN.TO.W.0034.110522T0104Z-110522T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
804 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 845 PM CDT

* AT 804 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 9 MILES SOUTH OF ADA...
  MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IN THE WARNING INCLUDE ADA AND FRANCIS.

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 3489 9659 3466 9651 3461 9675 3463 9679
TIME...MOT...LOC 0104Z 212DEG 20KT 3466 9672

$$


30

2 follow-up statements

113 
WWUS54 KOUN 220118
SVSOUN

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

OKC123-220145-
/O.CON.KOUN.TO.W.0034.000000T0000Z-110522T0145Z/
PONTOTOC OK-
818 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR CENTRAL
PONTOTOC COUNTY...

AT 818 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 13 MILES SOUTH OF 
FRANCIS...MOVING NORTHEAST AT 25 MPH. THE STORM HAS WEAKENED... BUT 
COULD STILL PRODUCE A WEAK SHORT-LIVED TORNADO.

* LOCATIONS IN THE WARNING INCLUDE FRANCIS.

LAT...LON 3489 9659 3469 9652 3467 9665 3470 9672
TIME...MOT...LOC 0118Z 212DEG 20KT 3471 9664

$$


30

323 
WWUS54 KOUN 220123
SVSOUN

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

OKC123-220133-
/O.CAN.KOUN.TO.W.0034.000000T0000Z-110522T0145Z/
PONTOTOC OK-
823 PM CDT SAT MAY 21 2011

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

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

LAT...LON 3489 9659 3469 9652 3467 9665 3470 9672
TIME...MOT...LOC 0123Z 221DEG 25KT 3475 9660

$$


30

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 7:14 PM CDT	Special Weather Statement	OUN	Pottawatomie	31 min
May 21, 7:38 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc, Pottawatomie, Seminole	52 min
May 21, 7:40 PM CDT	Tornado Warning	OUN	Johnston, Murray, Pontotoc	31 min
May 21, 7:49 PM CDT	Tornado Warning	OUN	Garvin, McClain, Pontotoc	41 min
May 21, 8:24 PM CDT	Tornado Warning	OUN	Pontotoc	51 min
May 21, 9:07 PM CDT	Tornado Warning	OUN	Pontotoc, Seminole	23 min
May 21, 9:29 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Seminole	11 min
May 22, 4:35 PM CDT	Special Weather Statement	OUN	Love	25 min
May 22, 4:41 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love, Marshall	49 min
May 22, 5:15 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Johnston, Love, Murray	45 min
May 22, 5:51 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Garvin, Johnston, Murray, Pontotoc, Seminole	39 min
May 22, 6:27 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc, Seminole	63 min
May 22, 6:31 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	59 min
May 22, 6:36 PM CDT	Special Weather Statement	OUN	Love	24 min
May 22, 6:55 PM CDT	Severe Thunderstorm Warning	OUN	Love, Marshall	50 min

Nearby

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