Alert archive / Oklahoma / Tornado Warnings in 2012

Tornado Warning 2, NWS Norman, OK

March 18, 2012Greer County, Oklahoma

NWS Norman, OK issued this tornado warning at Mar 18, 2012, 6:54 PM CDT for Greer County, Oklahoma. It was in force for 36 min. 2 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
Mar 18, 2012, 6:54 PM CDT (23:54 UTC)
Expired
Mar 18, 2012, 7:30 PM CDT
In force
36 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

County Greer County, OK

The radar

The Altus AFB radar (KFDR), 89 km from the middle of the area, began a volume at 23:54 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
Mar 18, 6:54 PM CDTTORNADO8 Nw Mangum, OKTIME AND LOCATION APPROXIMATE
Mar 18, 7:27 PM CDTTORNADO3 Wnw Willow, OKTIME AND LOCATION APPROXIMATE

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
Mar 18, 3:12 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.9 hours before the alert went out and 197 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, Amarillo Airport, TX at 12:00Z on 2012-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1066 joules per kilogram.LCLLFCEL10008507005003002001001 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, Amarillo Airport, TX at 12:00Z on 2012-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 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
1066 J/kg
Mixed-layer CIN
-188 J/kg
Mixed-layer LCL
832 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

990 
WFUS54 KOUN 182354
TOROUN
OKC055-190030-
/O.NEW.KOUN.TO.W.0002.120318T2354Z-120319T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
654 PM CDT SUN MAR 18 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  GREER COUNTY IN SOUTHWESTERN OKLAHOMA...

* UNTIL 730 PM CDT

* AT 650 PM CDT...RADAR AND STORM SPOTTERS OBSERVED A TORNADO 10 
  MILES WEST OF MANGUM. THE TORNADO WAS MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WILLOW AND BRINKMAN. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE 
LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE 
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND 
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3512 9951 3500 9934 3485 9967 3495 9974
TIME...MOT...LOC 2350Z 227DEG 23KT 3491 9968 

$$

WR
2 follow-up statements
369 
WWUS54 KOUN 182359
SVSOUN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
659 PM CDT SUN MAR 18 2012

OKC055-190030-
/O.CON.KOUN.TO.W.0002.000000T0000Z-120319T0030Z/
GREER OK-
659 PM CDT SUN MAR 18 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR GREER 
COUNTY...

AT 654 PM CDT...RADAR AND TRAINED WEATHER SPOTTERS OVSERVED A 
TORNADO. THIS TORNADIC STORM WAS LOCATED 8 MILES NORTHWEST OF 
MANGUM...MOVING NORTHEAST AT 30 MPH. 

LOCATIONS IMPACTED INCLUDE...
WILLOW AND BRINKMAN. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE 
LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE 
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND 
PROTECT YOURSELF FROM FLYING DEBRIS.

THIS TORNADO IS LIKELY OBSCURED BY RAIN AND MAY NOT BE VISIBLE. DO 
NOT WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW. ABANDON 
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.

&&

LAT...LON 3512 9951 3500 9934 3485 9967 3495 9974
TIME...MOT...LOC 2354Z 226DEG 25KT 3494 9964 

$$

WR
506 
WWUS54 KOUN 190016
SVSOUN
SEVERE WEATHER STATEMENTNATIONAL WEATHER SERVICE NORMAN OK715 PM CDT 
SUN MAR 18 2012

OKC055-190030-
/O.CON.KOUN.TO.W.0002.000000T0000Z-120319T0030Z/
GREER OK-
716 PM CDT SUN MAR 18 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR NORTH 
CENTRAL GREER COUNTY...

AT 712 PM CDT...DOPPLER RADAR INDICATED A TORNADO. THE TORNADO WAS 
LOCATED ABOUT 4 MILES WEST OF BRINKMAN MOVING NORTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
WILLOW AND BRINKMAN. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE 
LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE 
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND 
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3500 9967 3512 9951 3502 9939 3493 9961
TIME...MOT...LOC 0012Z 227DEG 23KT 2849 10717 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 18, 4:02 AM CDTWind AdvisoryOUNAlfalfa, Custer, Dewey, Ellis, Harper, Major and 3 more18 hr
Mar 18, 4:39 PM CDTSpecial Weather StatementOUNHarmon36 min
Mar 18, 4:55 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon, Jackson65 min
Mar 18, 5:58 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer, Harmon62 min
Mar 18, 6:26 PM CDTSevere Thunderstorm WarningOUNJackson, Tillman64 min
Mar 18, 6:31 PM CDTSpecial Weather StatementOUNRoger Mills29 min

Nearby

Tornado Warnings in Oklahoma, 2012Every tornado warning in 2012Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.