Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 35, NWS Tulsa, OK

April 9, 2012Osage County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 9, 2012, 8:22 PM CDT for Osage County, Oklahoma. It was in force for 53 min. 4 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: Apr 9, 2012, 8:22 PM CDT (01:22 UTC)
Expired: Apr 9, 2012, 9:15 PM CDT
In force: 53 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

County Osage County, OK

The radar

The Tulsa radar (KINX), 84 km from the middle of the area, began a volume at 01:25 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
Apr 9, 8:40 PM CDT	HAIL 2	4 Nw Okesa, OK	NINE MILES DUE WEST OF BARTLESVILLE.
Apr 9, 8:50 PM CDT	HAIL 1	Okesa, OK	LARGE HAIL LIKELY GREATER THAN A QUARTER CAUSED SIGNIFICANT DAMAGE TO HOME WINDOWS AND TO A VEHICLE IN OKESA. PUBLIC REPORT RETRIEVED VIA WASHINGTON COUNTY EMERGENCY MANAGEMENT SOCIAL MEDIA. TIME ESTIMATED VIA RADAR.
Apr 9, 9:00 PM CDT	HAIL 1.75	6 Nne Barnsdall, OK	GREATER THAN GOLF BALL SIZE HAIL REPORTED ON THE GROUNDS AT WOOLAROC. PUBLIC REPORT RETRIEVED VIA WASHINGTON COUNTY EMERGENCY MANAGEMENT SOCIAL MEDIA. TIME ESTIMATED VIA RADAR.
Apr 9, 9:00 PM CDT	HAIL 2	6 Ne Barnsdall, OK	REPORTED ON HIGHWAY 123 NEAR WOOLAROC. PUBLIC REPORT RETRIEVED VIA WASHINGTON COUNTY EMERGENCY MANAGEMENT SOCIAL MEDIA. TIME ESTIMATED VIA RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 1.4 hours before the alert went out and 123 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: 944 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 945 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

470 
WUUS54 KTSA 100122
SVRTSA
OKC113-100215-
/O.NEW.KTSA.SV.W.0035.120410T0122Z-120410T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
822 PM CDT MON APR 9 2012

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN OSAGE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 915 PM CDT

* AT 821 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BIGHEART...
  MOVING SOUTHEAST AT 30 MPH.

  STORM HAZARDS INCLUDE...
  HALF DOLLAR SIZE HAIL...
  WIND GUSTS TO 60 MPH...

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...OSAGE
  HILLS STATE PARK AND OKESA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM THAT IS LIKELY PRODUCING DAMAGING HAIL. IF
NO UNDERGROUND SHELTER IS AVAILABLE TAKE COVER ON THE LOWEST FLOOR IN
AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3685 9600 3666 9600 3654 9610 3682 9640
      3698 9621
TIME...MOT...LOC 0122Z 316DEG 25KT 3684 9623

$$

2 follow-up statements

088 
WWUS54 KTSA 100143
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
843 PM CDT MON APR 9 2012

OKC113-100215-
/O.CON.KTSA.SV.W.0035.000000T0000Z-120410T0215Z/
OSAGE OK-
843 PM CDT MON APR 9 2012

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
EASTERN OSAGE COUNTY...

AT 841 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR OSAGE HILLS
STATE PARK...MOVING SOUTHEAST AT 30 MPH.

STORM HAZARDS INCLUDE...
DAMAGING GOLF BALL SIZE HAIL...
WIND GUSTS TO 60 MPH...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...OKESA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM THAT IS LIKELY PRODUCING DAMAGING HAIL. IF
NO UNDERGROUND SHELTER IS AVAILABLE TAKE COVER ON THE LOWEST FLOOR IN
AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3685 9600 3666 9600 3654 9610 3675 9631
      3688 9610
TIME...MOT...LOC 0143Z 318DEG 24KT 3674 9614

$$

276 
WWUS54 KTSA 100152
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
852 PM CDT MON APR 9 2012

OKC113-100215-
/O.CON.KTSA.SV.W.0035.000000T0000Z-120410T0215Z/
OSAGE OK-
852 PM CDT MON APR 9 2012

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
EASTERN OSAGE COUNTY...

AT 849 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR OKESA...MOVING
SOUTHEAST AT 25 MPH. THIS STORM HAS A HISTORY OF PRODUCING HAIL TO 
THE SIZE OF TENNIS BALLS.

STORM HAZARDS INCLUDE...
DAMAGING GOLF BALL TO TENNIS BALL SIZE HAIL...
WIND GUSTS TO 60 MPH...

THIS STORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM THAT IS LIKELY PRODUCING DAMAGING HAIL. IF
NO UNDERGROUND SHELTER IS AVAILABLE TAKE COVER ON THE LOWEST FLOOR IN
AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3681 9601 3666 9600 3654 9610 3670 9625
      3684 9606
TIME...MOT...LOC 0152Z 323DEG 21KT 3670 9611

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:45 PM CDT	Severe Thunderstorm Warning	TSA	Osage	60 min
Apr 9, 8:51 PM CDT	Severe Thunderstorm Warning	TSA	Osage	54 min
Apr 9, 9:03 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata	57 min
Apr 9, 9:04 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Rogers, Washington	41 min
Apr 9, 9:30 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Washington	45 min
Apr 9, 9:41 PM CDT	Special Weather Statement	TSA	Osage	49 min
Apr 9, 9:56 PM CDT	Special Weather Statement	TSA	Ottawa	49 min

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.