Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS Tulsa, OK

April 9, 2012Rogers County, Tulsa County, Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 9, 2012, 9:30 PM CDT for Rogers County, Tulsa County, Washington County, Oklahoma. It was in force for 45 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
Apr 9, 2012, 9:30 PM CDT (02:30 UTC)
Expired
Apr 9, 2012, 10:15 PM CDT
In force
45 min
Issued by
NWS Tulsa, OK
Area
Storm-based polygon

Counties Rogers County, OK, Tulsa County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 33 km from the middle of the area, began a volume at 02:33 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
Apr 9, 9:37 PM CDTHAIL 1.753 S Ramona, OKQUARTER TO GOLF BALL SIZED HAIL COVERING THE GROUND.
Apr 9, 10:00 PM CDTHAIL 0.753 Ne Collinsville, OK

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, 2.5 hours before the alert went out and 157 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, Lamont, OK at 00:00Z on 2012-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 944 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, Lamont, OK at 00:00Z on 2012-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 square meters per square second.1939587897Sfc1 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
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.

447 
WUUS54 KTSA 100230
SVRTSA
OKC131-143-147-100315-
/O.NEW.KTSA.SV.W.0039.120410T0230Z-120410T0315Z/

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

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ROGERS COUNTY IN NORTHEAST OKLAHOMA
  NORTHERN TULSA COUNTY IN NORTHEAST OKLAHOMA
  WASHINGTON COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 1015 PM CDT

* AT 928 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR RAMONA...
  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...VERA...
  COLLINSVILLE AND OOLOGAH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PERSONS NEAR THE PATH OF THIS DANGEROUS STORM SHOULD PREPARE FOR
LARGE DESTRUCTIVE HAIL. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS
INJURY AND SIGNIFICANT DAMAGE TO PROPERTY. IF NO UNDERGROUND SHELTER
IS AVAILABLE TAKE COVER ON THE LOWEST FLOOR IN AN INTERIOR ROOM AND
STAY AWAY FROM WINDOWS.

&&

LAT...LON 3641 9546 3625 9592 3651 9600 3659 9583
TIME...MOT...LOC 0230Z 316DEG 25KT 3650 9589

$$
2 follow-up statements
325 
WWUS54 KTSA 100258
SVSTSA

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

OKC131-143-147-100315-
/O.CON.KTSA.SV.W.0039.000000T0000Z-120410T0315Z/
ROGERS OK-TULSA OK-WASHINGTON OK-
958 PM CDT MON APR 9 2012

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR SOUTHERN WASHINGTON...NORTHEASTERN TULSA AND NORTHERN ROGERS
COUNTIES...

AT 954 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
COLLINSVILLE...MOVING SOUTHEAST AT 30 MPH.

STORM HAZARDS INCLUDE...
HALF DOLLAR SIZE HAIL...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM 
INCLUDE...COLLINSVILLE AND RURAL SECTIONS OF WESTERN ROGERS COUNTY.

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 3642 9590 3652 9576 3641 9546 3625 9592
TIME...MOT...LOC 0258Z 316DEG 25KT 3640 9577

$$
308 
WWUS54 KTSA 100309
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1009 PM CDT MON APR 9 2012

OKC131-143-147-100319-
/O.EXP.KTSA.SV.W.0039.000000T0000Z-120410T0315Z/
ROGERS OK-TULSA OK-WASHINGTON OK-
1009 PM CDT MON APR 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WASHINGTON...
NORTHEASTERN TULSA AND NORTHERN ROGERS COUNTIES EXPIRES AT 1015 PM
CDT...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS...THEREFORE THE
SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 3642 9590 3652 9576 3641 9546 3625 9592
TIME...MOT...LOC 0309Z 316DEG 25KT 3634 9570

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 7:45 PM CDTSevere Thunderstorm WarningTSAOsage60 min
Apr 9, 8:22 PM CDTSevere Thunderstorm WarningTSAOsage53 min
Apr 9, 8:51 PM CDTSevere Thunderstorm WarningTSAOsage54 min
Apr 9, 9:03 PM CDTSevere Thunderstorm WarningTSACraig, Nowata57 min
Apr 9, 9:04 PM CDTSevere Thunderstorm WarningTSAOsage, Rogers, Washington41 min
Apr 9, 9:41 PM CDTSpecial Weather StatementTSAOsage49 min
Apr 9, 9:56 PM CDTSpecial Weather StatementTSAOttawa49 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2012Every 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.