Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 21, NWS Norman, OK

February 28, 2012Grant County, Kay County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Feb 28, 2012, 8:14 PM CST for Grant County, Kay County, Oklahoma. It was in force for 61 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: Feb 28, 2012, 8:14 PM CST (02:14 UTC)
Expired: Feb 28, 2012, 9:15 PM CST
In force: 61 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Grant County, OK, Kay County, OK

The radar

The Vance AFB radar (KVNX), 98 km from the middle of the area, began a volume at 02:15 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

Time	Report	Where	Remark
Feb 28, 8:45 PM CST	TSTM WND GST 70	Braman, OK	ESTIMATED 70-80 MPH GUST
Feb 28, 8:45 PM CST	HAIL 1	Braman, 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.

Issued	Product	Office	Lasted
Feb 28, 8:10 PM CST	Tornado Watch	SPC	5 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 2.2 hours before the alert went out and 45 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: 386 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 660 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 369 m²/s²
0-3 km storm-relative helicity: 461 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

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

449 
WUUS54 KOUN 290214
SVROUN
OKC053-071-290315-
/O.NEW.KOUN.SV.W.0021.120229T0214Z-120229T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
814 PM CST TUE FEB 28 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GRANT COUNTY IN NORTHERN OKLAHOMA...
  KAY COUNTY IN NORTHERN OKLAHOMA...

* UNTIL 915 PM CST

* AT 814 PM CST...NATIONAL WEATHER SERVICE RADAR INDICATED SEVERE
  THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTH OF 
  RENFROW   TO 11 MILES WEST OF POND CREEK...MOVING RAPIDLY EAST 
  AT 55 MPH.

HAZARDS IN THE WARNING INCLUDE...
DESTRUCTIVE WIND GUSTS TO 65 MPH...

* LOCATIONS IN THE WARNING INCLUDE BLACKWELL LAKE...BLACKWELL...
  BRAMAN...CHILOCCO...DEER CREEK...HARDY...JEFFERSON...KAW CITY...KAW
  LAKE...KILDARE...LAMONT...MEDFORD...NARDIN...NEWKIRK...PECKHAM...
  PONCA CITY...POND CREEK...RENFROW AND TONKAWA.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 209 AND 235.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PARTICULARLY DAMAGING WINDS ARE EXPECTED. MOBILE HOMES AND HIGH
PROFILE VEHICLES ARE ESPECIALLY SUSCEPTIBLE TO HIGH WINDS AND MAY BE
OVERTURNED. MOVE TO A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3699 9674 3688 9674 3676 9680 3674 9683
      3675 9688 3668 9693 3669 9704 3668 9706
      3660 9705 3660 9810 3701 9774 3700 9675
TIME...MOT...LOC 0214Z 277DEG 46KT 3699 9761 3664 9794

$$


CMS

2 follow-up statements

617 
WWUS54 KOUN 290230
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
830 PM CST TUE FEB 28 2012

OKC053-071-290315-
/O.CON.KOUN.SV.W.0021.000000T0000Z-120229T0315Z/
GRANT OK-KAY OK-
830 PM CST TUE FEB 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CST
FOR KAY AND EASTERN GRANT COUNTIES...

AT 830 PM CST...NATIONAL WEATHER SERVICE RADAR DETECTED SEVERE
THUNDERSTORMS ALONG A LINE EXTENDING FROM 4 MILES NORTHWEST OF BRAMAN
TO 6 MILES SOUTHEAST OF POND CREEK...MOVING EAST AT 55 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
WIND GUSTS TO 60 MPH...

* LOCATIONS IN THE WARNING INCLUDE BLACKWELL LAKE...BLACKWELL...
  BRAMAN...CHILOCCO...DEER CREEK...HARDY...KAW CITY...KAW LAKE...
  KILDARE...LAMONT...NARDIN...NEWKIRK...PECKHAM...PONCA CITY...POND
  CREEK AND TONKAWA.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 209 AND 235.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

&&

LAT...LON 3699 9674 3688 9674 3676 9680 3674 9683
      3675 9688 3668 9693 3669 9704 3668 9706
      3660 9705 3661 9786 3701 9758 3700 9675
TIME...MOT...LOC 0230Z 277DEG 46KT 3696 9736 3661 9769

$$


CMS

693 
WWUS54 KOUN 290252
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
852 PM CST TUE FEB 28 2012

OKC053-071-290315-
/O.CON.KOUN.SV.W.0021.000000T0000Z-120229T0315Z/
GRANT OK-KAY OK-
852 PM CST TUE FEB 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CST
FOR KAY AND EASTERN GRANT COUNTIES...

AT 852 PM CST...NATIONAL WEATHER SERVICE RADAR DETECTED SEVERE 
THUNDERSTORMS ALONG A LINE EXTENDING FROM CHILOCCO...TO 
BLACKWELL...TO 7 MILES WEST OF TONKAWA...MOVING EAST AT 40 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
DESTRUCTIVE WIND GUSTS TO 75 MPH...

* LOCATIONS IN THE WARNING INCLUDE BLACKWELL...BRAMAN...CHILOCCO...
  HARDY...KAW CITY...KAW LAKE...KILDARE...LAMONT...NARDIN...
  NEWKIRK...PECKHAM...PONCA CITY AND TONKAWA.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 209 AND 230.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

&&

LAT...LON 3699 9674 3688 9674 3676 9680 3674 9683
      3675 9688 3668 9693 3669 9704 3668 9706
      3660 9705 3662 9762 3701 9729 3700 9675
TIME...MOT...LOC 0252Z 279DEG 35KT 3698 9706 3668 9741

$$


CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 7:03 PM CST	Special Weather Statement	OUN	Alfalfa, Major, Woods	27 min
Feb 28, 7:31 PM CST	Special Weather Statement	OUN	Alfalfa, Grant	29 min
Feb 28, 7:44 PM CST	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	31 min
Feb 28, 9:18 PM CST	Special Weather Statement	OUN	Noble, Payne	42 min
Feb 28, 10:32 PM CST	Special Weather Statement	OUN	Carter, Coal, Hughes, Johnston, Marshall, Murray and 2 more	43 min
Feb 28, 11:13 PM CST	Special Weather Statement	OUN	Seminole	17 min
Feb 29, 4:14 AM CST	Fire Weather Watch	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 26 more	23 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2012 Every severe thunderstorm warning 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.