Alert archive / Oklahoma / Tornado Warnings in 2012

Tornado Warning 37, NWS Norman, OK

April 15, 2012Harper County, Woods County, Woodward County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 15, 2012, 12:42 AM CDT for Harper County, Woods County, Woodward County, Oklahoma. It was in force for 33 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 15, 2012, 12:42 AM CDT (05:42 UTC)
Expired: Apr 15, 2012, 1:15 AM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Harper County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 80 km from the middle of the area, began a volume at 05:41 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, 5:24 PM CDT	Tornado Watch PDS	SPC	9 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 5.7 hours before the alert went out and 138 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: 2195 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 863 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 335 m²/s²
0-3 km storm-relative helicity: 436 m²/s²
Significant tornado parameter: 5.9
Supercell composite: 19.0

Open this sounding in Storm Lab

The text

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

413 
WFUS54 KOUN 150542
TOROUN
OKC059-151-153-150615-
/O.NEW.KOUN.TO.W.0037.120415T0542Z-120415T0615Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1242 AM CDT SUN APR 15 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME SOUTHEASTERN HARPER COUNTY IN NORTHWESTERN OKLAHOMA...
  WOODS COUNTY IN NORTHWESTERN OKLAHOMA...
  NORTHEASTERN WOODWARD COUNTY IN NORTHWESTERN OKLAHOMA...

* UNTIL 115 AM CDT

* AT 1237 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS 
  DETECTED A SEVERE THUNDERSTORM  WITH A HISTORY OF PRODUCING 
  TORNADOES. THIS DANGEROUS STORM WAS LOCATED 10 MILES NORTH OF 
  MOORELAND...MOVING NORTHEAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FREEDOM...AVARD AND CAMP HOUSTON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE TORNADO WILL BE VERY DIFFICULT TO SEE IN THE DARK. DO NOT 
WAIT. TAKE COVER NOW.

&&

LAT...LON 3673 9864 3671 9864 3647 9922 3647 9924
      3660 9939 3663 9937 3700 9908 3700 9899
TIME...MOT...LOC 0537Z 225DEG 46KT 3658 9926 

$$

AUSTIN

1 follow-up statement

732 
WWUS54 KOUN 150552
SVSOUN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1252 AM CDT SUN APR 15 2012

OKC059-150625-
/O.CAN.KOUN.TO.W.0037.000000T0000Z-120415T0615Z/
HARPER OK-
1252 AM CDT SUN APR 15 2012

...THE TORNADO WARNING FOR EXTREME SOUTHEASTERN HARPER COUNTY IS 
CANCELLED...

THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT 
OF THE WARNED AREA. THE WARNING HAS BEEN CANCELLED. 

LAT...LON 3700 9899 3673 9864 3671 9864 3656 9914
      3670 9927 3700 9908
TIME...MOT...LOC 0551Z 225DEG 46KT 3666 9916 

$$

OKC151-153-150615-
/O.CON.KOUN.TO.W.0037.000000T0000Z-120415T0615Z/
WOODS OK-WOODWARD OK-
1252 AM CDT SUN APR 15 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 115 AM CDT FOR WOODS 
AND NORTHEASTERN WOODWARD COUNTIES...

AT 1246 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
A SEVERE THUNDERSTORM WITH A HISTORY OF PRODUCING TORNADOES. THIS 
DANGEROUS STORM WAS LOCATED 7 MILES SOUTH OF FREEDOM...MOVING 
NORTHEAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
FREEDOM...AVARD AND CAMP HOUSTON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GET IN...GET DOWN AND COVER UP. TAKE COVER NOW IN A STORM SHELTER 
OR AN INTERIOR ROOM OF A STURDY BUILDING. STAY AWAY FROM DOORS AND 
WINDOWS.

THE TORNADO WILL BE VERY DIFFICULT TO SEE IN THE DARK. DO NOT 
WAIT. TAKE COVER NOW.

&&

LAT...LON 3700 9899 3673 9864 3671 9864 3656 9914
      3670 9927 3700 9908
TIME...MOT...LOC 0546Z 225DEG 46KT 3666 9916 

$$

AUSTIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 7:06 PM CDT	Tornado Warning	OUN	Alfalfa, Woods	54 min
Apr 14, 7:09 PM CDT	Tornado Warning	OUN	Major, Woods	36 min
Apr 14, 7:35 PM CDT	Tornado Warning	OUN	Alfalfa, Woods	40 min
Apr 14, 8:07 PM CDT	Tornado Warning	OUN	Alfalfa	38 min
Apr 14, 10:35 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	40 min
Apr 14, 10:56 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills, Woodward	49 min
Apr 14, 11:13 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	62 min
Apr 14, 11:19 PM CDT	Special Weather Statement	OUN	Alfalfa, Beckham, Dewey	56 min
Apr 14, 11:41 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Ellis, Greer, Harmon and 3 more	64 min
Apr 14, 11:53 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills, Woodward	37 min
Apr 15, 12:00 AM CDT	Tornado Warning	OUN	Ellis, Harper, Woodward	30 min
Apr 15, 12:03 AM CDT	Tornado Warning	OUN	Beckham, Roger Mills	27 min
Apr 15, 12:16 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Ellis, Harper, Major, Woods, Woodward	59 min
Apr 15, 12:16 AM CDT	Tornado Warning	OUN	Ellis, Harper, Woodward	29 min
Apr 15, 12:33 AM CDT	Tornado Warning	OUN	Custer, Dewey, Roger Mills	42 min
Apr 15, 12:39 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Ellis, Greer, Harmon and 5 more	66 min
Apr 15, 1:15 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Dewey, Grant, Major, Woods, Woodward	60 min
Apr 15, 1:29 AM CDT	Special Weather Statement	OUN	Blaine, Caddo, Kingfisher, Tillman	61 min
Apr 15, 1:36 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Comanche, Custer, Dewey and 3 more	54 min
Apr 15, 1:41 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Tillman	64 min
Apr 15, 2:34 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Comanche, Grady, Kingfisher and 3 more	56 min
Apr 15, 2:37 AM CDT	Special Weather Statement	OUN	Lincoln, McClain, Payne, Pottawatomie	68 min
Apr 15, 2:44 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Grady, Jefferson, Stephens, Tillman	45 min
Apr 15, 3:06 AM CDT	Special Weather Statement	OUN	Kay, Noble	24 min
Apr 15, 3:36 AM CDT	Special Weather Statement	OUN	Grady, Kay, Logan, McClain, Noble, Oklahoma and 1 more	54 min
Apr 15, 3:40 AM CDT	Special Weather Statement	OUN	Jefferson, Stephens	65 min
Apr 15, 4:35 AM CDT	Special Weather Statement	OUN	Cleveland, Garvin, Lincoln, Payne, Pottawatomie, Seminole	55 min
Apr 15, 4:37 AM CDT	Special Weather Statement	OUN	Carter, Garvin, Johnston, Love, Marshall, Murray and 1 more	53 min
Apr 15, 5:36 AM CDT	Special Weather Statement	OUN	Coal, Hughes, Pontotoc, Seminole	54 min
Apr 15, 6:52 AM CDT	Special Weather Statement	OUN	Atoka, Coal, Hughes	23 min
Apr 15, 7:53 AM CDT	Severe Thunderstorm Warning	OUN	Bryan	52 min
Apr 15, 8:27 AM CDT	Severe Thunderstorm Warning	OUN	Atoka	48 min
Apr 15, 9:03 AM CDT	Special Weather Statement	OUN	Bryan	27 min
Apr 15, 9:34 AM CDT	Special Weather Statement	OUN	Atoka	26 min
Apr 15, 11:00 AM CDT	Wind Advisory	OUN	Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 11 more	6 hr

Nearby

Tornado Warnings in Oklahoma, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.