Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 40, NWS Tulsa, OK

April 11, 2012McIntosh County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 11, 2012, 4:19 AM CDT for McIntosh County, Oklahoma. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 11, 2012, 4:19 AM CDT (09:19 UTC)
Expired
Apr 11, 2012, 4:46 AM CDT
In force
27 min
Issued by
NWS Tulsa, OK
Area
Storm-based polygon

County McIntosh County, OK

The radar

The Tulsa radar (KINX), 84 km from the middle of the area, began a volume at 09:19 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.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 9.3 hours before the alert went out and 163 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, Norman, OK at 00:00Z on 2012-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 843 joules per kilogram.LCLLFCEL10008507005003002001001 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, Norman, OK at 00:00Z on 2012-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.193958Sfc1 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
843 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1271 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.7

Open this sounding in Storm Lab

The text

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

009 
WUUS54 KTSA 110919
SVRTSA
OKC091-111000-
/O.NEW.KTSA.SV.W.0040.120411T0919Z-120411T1000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
419 AM CDT WED APR 11 2012

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL MCINTOSH COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 500 AM CDT

* AT 414 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED 6 MILES NORTH OF
  STIDHAM...MOVING SOUTHEAST AT 10 MPH.

  STORM HAZARDS INCLUDE...
  QUARTER SIZE HAIL...

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...STIDHAM
  AND LAKE EUFAULA STATE PARK.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 251 AND 261.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3542 9546 3528 9566 3545 9578 3552 9572
TIME...MOT...LOC 0920Z 308DEG 7KT 3545 9568

$$
2 follow-up statements
482 
WWUS54 KTSA 110935
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
435 AM CDT WED APR 11 2012

OKC091-111000-
/O.CON.KTSA.SV.W.0040.000000T0000Z-120411T1000Z/
MCINTOSH OK-
435 AM CDT WED APR 11 2012

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 AM CDT FOR
CENTRAL MCINTOSH COUNTY...

AT 433 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR LAKE EUFAULA
STATE PARK...MOVING SOUTHEAST AT 10 MPH.

STORM HAZARDS INCLUDE...
QUARTER SIZE HAIL...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...LAKE
EUFAULA STATE PARK AND ONAPA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3542 9546 3530 9564 3544 9570 3546 9567
TIME...MOT...LOC 0935Z 308DEG 7KT 3542 9563

$$
835 
WWUS54 KTSA 110946
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
446 AM CDT WED APR 11 2012

OKC091-110957-
/O.CAN.KTSA.SV.W.0040.000000T0000Z-120411T1000Z/
MCINTOSH OK-
446 AM CDT WED APR 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MCINTOSH COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS...THEREFORE THE
SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

SMALL HAIL TO PENNY SIZE WILL STILL BE POSSIBLE WITH THIS STORM.

LAT...LON 3542 9546 3530 9564 3544 9570 3546 9567
TIME...MOT...LOC 0947Z 308DEG 7KT 3541 9561

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 11, 2:39 AM CDTSpecial Weather StatementTSATulsa36 min
Apr 11, 3:09 AM CDTSpecial Weather StatementTSAMcIntosh36 min
Apr 11, 3:10 AM CDTSpecial Weather StatementTSAPawnee35 min
Apr 11, 3:21 AM CDTSpecial Weather StatementTSAOkmulgee24 min
Apr 11, 3:25 AM CDTSpecial Weather StatementTSASequoyah35 min
Apr 11, 3:44 AM CDTSpecial Weather StatementTSAMuskogee31 min
Apr 11, 4:15 AM CDTSpecial Weather StatementTSAMcIntosh30 min
Apr 11, 4:48 AM CDTSpecial Weather StatementTSAHaskell42 min
Apr 11, 4:56 AM CDTSpecial Weather StatementTSALatimer34 min
Apr 11, 5:02 AM CDTSpecial Weather StatementTSACreek28 min
Apr 11, 6:27 AM CDTSpecial Weather StatementTSAMcIntosh33 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.