Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 18, NWS Norman, OK

April 14, 2011Atoka County, Coal County, Johnston County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 14, 2011, 8:34 PM CDT for Atoka County, Coal County, Johnston County, Oklahoma. It was in force for 41 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 14, 2011, 8:34 PM CDT (01:34 UTC)
Expired: Apr 14, 2011, 9:15 PM CDT
In force: 41 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Atoka County, OK, Coal County, OK, Johnston County, OK

The radar

The Norman radar (KTLX), 128 km from the middle of the area, began a volume at 01:34 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
Apr 14, 2:28 PM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.6 hours before the alert went out and 129 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: 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.

768 
WFUS54 KOUN 150134
TOROUN
OKC005-029-069-150215-
/O.NEW.KOUN.TO.W.0018.110415T0134Z-110415T0215Z/

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

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN ATOKA COUNTY IN SOUTHEAST OKLAHOMA...
  COAL COUNTY IN SOUTHEAST OKLAHOMA...
  NORTHEASTERN JOHNSTON COUNTY IN SOUTHEAST OKLAHOMA...

* UNTIL 915 PM CDT

* AT 833 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES NORTHEAST OF
  CLARITA...MOVING EAST AT 25 MPH.

  ANOTHER STORM CAPABLE OF PRODUCING A TORNADO WAS 5 MILES WEST OF   
  WAPANUCKA MOVING EAST AT 30 MPH. 

* LOCATIONS IN THE WARNING INCLUDE BROMIDE...CENTRAHOMA...CENTRAL
  ATOKA RESERVOIR...CLARITA...COALGATE...LEHIGH...OLNEY...PHILLIPS
  AND TUPELO.

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 3478 9609 3451 9609 3451 9614 3442 9614
      3440 9653 3464 9645
TIME...MOT...LOC 0133Z 256DEG 20KT 3452 9636

$$

2 follow-up statements

573 
WWUS54 KOUN 150149
SVSOUN

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

OKC069-150158-
/O.CAN.KOUN.TO.W.0018.000000T0000Z-110415T0215Z/
JOHNSTON OK-
849 PM CDT THU APR 14 2011

...THE TORNADO WARNING HAS BEEN CANCELLED FOR NORTHEASTERN JOHNSTON
COUNTY...

LAT...LON 3451 9609 3451 9614 3442 9614 3441 9640
      3442 9640 3460 9629 3477 9610 3475 9609
TIME...MOT...LOC 0148Z 249DEG 34KT 3456 9621

$$

OKC005-029-150215-
/O.CON.KOUN.TO.W.0018.000000T0000Z-110415T0215Z/
COAL OK-ATOKA OK-
849 PM CDT THU APR 14 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR WESTERN
ATOKA AND EASTERN COAL COUNTIES...

AT 848 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR COALGATE...MOVING
EAST AT 40 MPH.

* LOCATIONS IN THE WARNING INCLUDE CENTRAL ATOKA RESERVOIR...
  COALGATE...LEHIGH...OLNEY AND PHILLIPS.

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 3451 9609 3451 9614 3442 9614 3441 9640
      3442 9640 3460 9629 3477 9610 3475 9609
TIME...MOT...LOC 0148Z 249DEG 34KT 3456 9621

$$

116 
WWUS54 KOUN 150208 RRA
SVSOUN

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

OKC005-029-150219-
/O.EXP.KOUN.TO.W.0018.000000T0000Z-110415T0215Z/
COAL OK-ATOKA OK-
908 PM CDT THU APR 14 2011

...THE TORNADO WARNING FOR WESTERN ATOKA AND EASTERN COAL COUNTIES
WILL EXPIRE AT 915 PM CDT...

THE STORMS HAVE MOVED OUT OF THE AREA.

LAT...LON 3451 9609 3451 9614 3442 9614 3441 9640
      3442 9640 3460 9629 3477 9610 3475 9609
TIME...MOT...LOC 0209Z 249DEG 34KT 3463 9598

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 7:13 PM CDT	Tornado Warning	OUN	Hughes	32 min
Apr 14, 7:28 PM CDT	Tornado Warning	OUN	Johnston, Murray, Pontotoc	47 min
Apr 14, 7:53 PM CDT	Special Weather Statement	OUN	Lincoln	22 min
Apr 14, 7:54 PM CDT	Tornado Warning	OUN	Coal, Johnston, Pontotoc	36 min
Apr 14, 7:58 PM CDT	Tornado Warning	OUN	Atoka, Coal	32 min
Apr 14, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	22 min
Apr 14, 8:17 PM CDT	Tornado Warning	OUN	Atoka, Coal	58 min
Apr 14, 8:17 PM CDT	Tornado Warning	OUN	Atoka, Johnston	28 min
Apr 14, 8:37 PM CDT	Special Weather Statement	OUN	Murray	23 min
Apr 14, 8:39 PM CDT	Special Weather Statement	OUN	Coal, Hughes	21 min
Apr 14, 8:46 PM CDT	Tornado Warning	OUN	Atoka, Coal	39 min
Apr 14, 8:53 PM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Hughes, Murray, Pontotoc	3 hr
Apr 14, 8:59 PM CDT	Special Weather Statement	OUN	Coal, Hughes, Johnston, Marshall	31 min
Apr 14, 9:07 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Carter, Coal, Hughes, Johnston and 3 more	53 min
Apr 14, 9:46 PM CDT	High Wind Warning	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 21 more	24 hr
Apr 14, 9:55 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Coal, Marshall	53 min
Apr 15, 4:12 AM CDT	Red Flag Warning	OUN	Beckham, Caddo, Comanche, Cotton, Custer, Greer and 8 more	17 hr
Apr 15, 5:35 PM CDT	Freeze Warning	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 24 more	11 hr

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.