Alert archive / Oklahoma / Tornado Warnings in 2010

Tornado Warning 39, NWS Norman, OK

May 12, 2010Beckham County, Greer County, Harmon County, Oklahoma

NWS Norman, OK issued this tornado warning at May 12, 2010, 6:57 PM CDT for Beckham County, Greer County, Harmon County, Oklahoma. It was in force for 48 min. 6 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 12, 2010, 6:57 PM CDT (23:57 UTC)
Expired
May 12, 2010, 7:45 PM CDT
In force
48 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Beckham County, OK, Greer County, OK, Harmon County, OK

The radar

The Altus AFB radar (KFDR), 122 km from the middle of the area, began a volume at 23:57 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 12, 7:08 PM CDTHAIL 15 Sw Sayre, OK
May 12, 7:25 PM CDTHAIL 12 S Carter, OK
May 12, 7:25 PM CDTHAIL 1.753 W Carter, OK
May 12, 7:30 PM CDTHAIL 1.55 Ssw Elk City, OKRELAYED BY NWS EMPLOYEE. LOCATION APPROXIMATE.
May 12, 7:35 PM CDTHAIL 2.759 S Elk City, OK
May 12, 7:40 PM CDTHAIL 14 S Elk City, 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 12, 2:41 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 12.0 hours before the alert went out and 186 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 2010-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Amarillo Airport, TX at 12:00Z on 2010-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -83 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3606 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
-83 m²/s²
0-3 km storm-relative helicity
46 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.

727 
WFUS54 KOUN 122357
TOROUN
OKC009-055-057-130045-
/O.NEW.KOUN.TO.W.0039.100512T2357Z-100513T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
657 PM CDT WED MAY 12 2010

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN GREER COUNTY IN SOUTHWEST OKLAHOMA...
  NORTHERN HARMON COUNTY IN SOUTHWEST OKLAHOMA...
  BECKHAM COUNTY IN WESTERN OKLAHOMA...

* UNTIL 745 PM CDT

* AT 656 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A 
SEVERE   THUNDERSTORM WITH STRONG ROTATION 5 MILES SOUTHWEST OF   
DELHI...MOVING NORTHEAST AT 35 MPH.  ANOTHER POTENTIALLY TORNADIC
STORM WAS LOCATED ABOUT 5 MILES NORTHWEST OF VINSON.  THESE ARE
VERY DANGEROUS STORMS WITH VERY LARGE HAIL.  BASEBALL SIZE HAIL
IS LIKELY.

* LOCATIONS IN THE WARNING INCLUDE CARTER...DELHI...ELK CITY...
  ERICK...RETROP AND SAYRE.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 8 AND 42.

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 3540 9973 3543 9964 3543 9958 3545 9957
      3551 9936 3516 9936 3490 9988 3508 9999
TIME...MOT...LOC 2356Z 230DEG 31KT 3513 9971

$$
2 follow-up statements
751 
WWUS54 KOUN 130018
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
718 PM CDT WED MAY 12 2010

OKC057-130026-
/O.CAN.KOUN.TO.W.0039.000000T0000Z-100513T0045Z/
HARMON OK-
718 PM CDT WED MAY 12 2010

...THE TORNADO WARNING HAS BEEN CANCELLED FOR NORTHERN HARMON
COUNTY...

LAT...LON 3532 9972 3542 9956 3551 9937 3549 9936
      3516 9936 3503 9981 3515 9990
TIME...MOT...LOC 0016Z 230DEG 31KT 3520 9957

$$

OKC009-055-130045-
/O.CON.KOUN.TO.W.0039.000000T0000Z-100513T0045Z/
BECKHAM OK-GREER OK-
718 PM CDT WED MAY 12 2010

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR NORTHERN
GREER AND BECKHAM COUNTIES...

AT 716 PM CDT...RADAR CONTINUED TO SHOW A STORM CAPABLE OF PRODUCING
A TORNADO ABOUT 4 MILES EAST OF DELHI...MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IN THE WARNING INCLUDE CARTER...DELHI...ELK CITY AND
  SAYRE.

LAT...LON 3532 9972 3542 9956 3551 9937 3549 9936
      3516 9936 3503 9981 3515 9990
TIME...MOT...LOC 0016Z 230DEG 31KT 3520 9957

$$
100 
WWUS54 KOUN 130031
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
731 PM CDT WED MAY 12 2010

OKC009-055-130045-
/O.CON.KOUN.TO.W.0039.000000T0000Z-100513T0045Z/
BECKHAM OK-GREER OK-
731 PM CDT WED MAY 12 2010

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR NORTHERN
GREER AND BECKHAM COUNTIES...

AT 729 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE 
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO JUST EAST OF 
CARTER...MOVING NORTHEAST AT 35 MPH.  ANOTHER SEVERE THUNDERSTORM 
NEAR DELHI HAS WEAKENED BUT WILL BE CAPABLE OF PRODUCING HAIL NEAR 
THE SIZE OF GOLFBALLS.  

* LOCATIONS IN THE WARNING INCLUDE CARTER AND 

LAT...LON 3532 9972 3542 9956 3551 9937 3549 9936
      3516 9936 3503 9981 3515 9990
TIME...MOT...LOC 0029Z 230DEG 31KT 3524 9948

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 11, 7:47 PM CDTSevere Thunderstorm WarningOUNDewey, Ellis, Woodward58 min
May 11, 8:21 PM CDTTornado WarningOUNWoodward39 min
May 11, 8:58 PM CDTTornado WarningOUNWoodward35 min
May 12, 3:00 PM CDTSevere Thunderstorm WarningOUNWoods60 min
May 12, 3:52 PM CDTSevere Thunderstorm WarningOUNWoods, Woodward53 min
May 12, 4:08 PM CDTSevere Thunderstorm WarningOUNWoodward52 min
May 12, 4:19 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa, Tillman41 min
May 12, 4:46 PM CDTSevere Thunderstorm WarningOUNEllis59 min
May 12, 4:53 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa, Washita17 min
May 12, 5:00 PM CDTSevere Thunderstorm WarningOUNHarper, Woods, Woodward45 min
May 12, 5:09 PM CDTSevere Thunderstorm WarningOUNBeckham, Roger Mills66 min
May 12, 5:42 PM CDTTornado WarningOUNBeckham, Roger Mills48 min
May 12, 5:46 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woods, Woodward59 min
May 12, 6:02 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon43 min
May 12, 6:12 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer48 min
May 12, 6:19 PM CDTSevere Thunderstorm WarningOUNEllis, Roger Mills56 min
May 12, 6:23 PM CDTTornado WarningOUNBeckham, Greer, Harmon52 min
May 12, 6:23 PM CDTTornado WarningOUNRoger Mills37 min
May 12, 6:57 PM CDTSevere Thunderstorm WarningOUNWoods44 min

Nearby

Tornado Warnings in Oklahoma, 2010Every tornado warning in 2010Tornadoes in 2010

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.