Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 250, NWS Tulsa, OK

May 11, 20115 counties in Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 11, 2011, 5:09 PM CDT for 5 counties in Oklahoma. It was in force for 66 min. 1 report 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 11, 2011, 5:09 PM CDT (22:09 UTC)
Expired: May 11, 2011, 6:15 PM CDT
In force: 66 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Haskell County, OK, Latimer County, OK, LeFlore County, OK, Pittsburg County, OK, Pushmataha County, OK

The radar

The Western Arkansas radar (KSRX), 59 km from the middle of the area, began a volume at 22:10 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
May 11, 5:14 PM CDT	TSTM WND DMG	Yanush, OK	TREES DOWN AND DAMAGE TO THE PORCH OF A HOUSE IN YANUSH. TIME ESTIMATED BASED ON RADAR.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 5 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 11, 1:16 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.2 hours before the alert went out and 229 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: 1845 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 652 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 249 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.

990 
WUUS54 KTSA 112209
SVRTSA
OKC061-077-079-121-127-112315-
/O.NEW.KTSA.SV.W.0250.110511T2209Z-110511T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
509 PM CDT WED MAY 11 2011

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HASKELL COUNTY IN SOUTHEAST OKLAHOMA
  LATIMER COUNTY IN SOUTHEAST OKLAHOMA
  LE FLORE COUNTY IN SOUTHEAST OKLAHOMA
  EASTERN PITTSBURG COUNTY IN SOUTHEAST OKLAHOMA
  NORTHEASTERN PUSHMATAHA COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 615 PM CDT

* AT 506 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM HIGGINS TO 4 MILES SOUTHEAST OF KIAMICHI TO 21 MILES
  SOUTH OF KIAMICHI...MOVING NORTHEAST AT 50 MPH.

  STORM HAZARDS INCLUDE...
  QUARTER SIZE HAIL...
  WIND GUSTS TO 60 MPH...

* SOME LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  ALBION...DAMON...TALIHINA...WILBURTON...BENGAL...WHITESBORO...RED
  OAK...OCTAVIA...KINTA...FANSHAWE...MUSE...LEQUIRE...BIG CEDAR...
  WISTER...MCCURTAIN...STIGLER...HOWE...HEAVENER...POTEAU...KEOTA...
  BOKOSHE...PANAMA...TAMAHA...CAMERON...SPIRO AND POCOLA.

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 3455 9517 3486 9563 3542 9506 3538 9489
      3535 9491 3537 9485 3532 9481 3534 9478
      3532 9468 3529 9466 3530 9462 3525 9444
      3450 9446 3450 9504 3425 9504 3424 9511
TIME...MOT...LOC 2210Z 221DEG 42KT 3482 9542 3464 9508
          3437 9504

$$

5 follow-up statements

095 
WWUS54 KTSA 112231
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
531 PM CDT WED MAY 11 2011

OKC061-077-079-121-127-112315-
/O.CON.KTSA.SV.W.0250.000000T0000Z-110511T2315Z/
HASKELL OK-LE FLORE OK-PITTSBURG OK-PUSHMATAHA OK-LATIMER OK-
531 PM CDT WED MAY 11 2011

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR
LATIMER...NORTHEASTERN PUSHMATAHA...EASTERN PITTSBURG...LE FLORE AND
HASKELL COUNTIES...

AT 527 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM PANOLA TO 7 MILES NORTH OF WHITESBORO TO HONOBIA...
MOVING NORTHEAST AT 50 MPH.

STORM HAZARDS INCLUDE...
QUARTER SIZE HAIL...
WIND GUSTS TO 60 MPH...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...OCTAVIA...
LEWISVILLE...SUMMERFIELD...KINTA...FANSHAWE...MUSE...LEQUIRE...BIG
CEDAR...WISTER...MCCURTAIN...STIGLER...HODGEN...HOWE...MILTON...
KANIMA...HEAVENER...POTEAU...KEOTA...BOKOSHE...SHADY POINT...
PANAMA...TAMAHA...CAMERON...COWLINGTON...SPIRO...SCULLYVILLE...ROCK
ISLAND AND POCOLA.

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 3455 9517 3486 9563 3542 9506 3538 9489
      3535 9491 3537 9485 3532 9481 3534 9478
      3532 9468 3529 9466 3530 9462 3525 9444
      3450 9446 3450 9504 3425 9504 3424 9511
TIME...MOT...LOC 2231Z 221DEG 42KT 3501 9522 3482 9488
          3455 9484

$$

539 
WWUS54 KTSA 112241
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
541 PM CDT WED MAY 11 2011

OKC121-112251-
/O.CAN.KTSA.SV.W.0250.000000T0000Z-110511T2315Z/
PITTSBURG OK-
541 PM CDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN PITTSBURG COUNTY IS
CANCELLED...

LAT...LON 3496 9544 3503 9539 3503 9535 3508 9535
      3542 9506 3538 9489 3536 9490 3535 9491
      3537 9485 3532 9481 3534 9478 3532 9468
      3529 9466 3530 9462 3525 9444 3450 9446
      3450 9504
TIME...MOT...LOC 2241Z 221DEG 42KT 3514 9519 3491 9479
          3464 9475

$$

OKC061-077-079-127-112315-
/O.CON.KTSA.SV.W.0250.000000T0000Z-110511T2315Z/
HASKELL OK-LE FLORE OK-PUSHMATAHA OK-LATIMER OK-
541 PM CDT WED MAY 11 2011

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR
LATIMER...NORTHEASTERN PUSHMATAHA...LE FLORE AND HASKELL COUNTIES...

AT 540 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM KINTA TO SUMMERFIELD TO MUSE...MOVING NORTHEAST AT 50
MPH.

STORM HAZARDS INCLUDE...
QUARTER SIZE HAIL...
DAMAGING WIND GUSTS TO 70 MPH...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...BIG
CEDAR...WISTER...MCCURTAIN...STIGLER...HODGEN...HOWE...MILTON...
KANIMA...HEAVENER...POTEAU...KEOTA...BOKOSHE...SHADY POINT...
PANAMA...CAMERON...TAMAHA...COWLINGTON...SPIRO...SCULLYVILLE...ROCK
ISLAND AND POCOLA.

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 3496 9544 3503 9539 3503 9535 3508 9535
      3542 9506 3538 9489 3536 9490 3535 9491
      3537 9485 3532 9481 3534 9478 3532 9468
      3529 9466 3530 9462 3525 9444 3450 9446
      3450 9504
TIME...MOT...LOC 2241Z 221DEG 42KT 3514 9519 3491 9479
          3464 9475

$$

451 
WWUS54 KTSA 112251
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
551 PM CDT WED MAY 11 2011

OKC061-077-079-127-112315-
/O.CON.KTSA.SV.W.0250.000000T0000Z-110511T2315Z/
HASKELL OK-LE FLORE OK-PUSHMATAHA OK-LATIMER OK-
551 PM CDT WED MAY 11 2011

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR
EASTERN LATIMER...NORTHEASTERN PUSHMATAHA...LE FLORE AND HASKELL
COUNTIES...

AT 548 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM STIGLER TO WISTER TO OCTAVIA...MOVING NORTHEAST AT 50
MPH.

STORM HAZARDS INCLUDE...
DAMAGING WIND GUSTS TO 70 MPH...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...HODGEN...
HOWE...MILTON...HEAVENER...KANIMA...POTEAU...KEOTA...BOKOSHE...SHADY
POINT...PANAMA...TAMAHA...CAMERON...COWLINGTON...SPIRO...ROCK
ISLAND...SCULLYVILLE AND POCOLA.

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 3450 9493 3508 9535 3542 9506 3538 9489
      3536 9490 3535 9491 3537 9485 3532 9481
      3534 9478 3532 9468 3529 9466 3530 9462
      3525 9444 3450 9447
TIME...MOT...LOC 2251Z 221DEG 42KT 3523 9509 3495 9467
          3460 9463

$$

464 
WWUS54 KTSA 112301
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
601 PM CDT WED MAY 11 2011

OKC127-112311-
/O.CAN.KTSA.SV.W.0250.000000T0000Z-110511T2315Z/
PUSHMATAHA OK-
601 PM CDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PUSHMATAHA COUNTY
IS CANCELLED...

LAT...LON 3480 9491 3508 9535 3542 9506 3538 9489
      3536 9490 3535 9491 3537 9485 3532 9481
      3534 9478 3532 9468 3529 9466 3530 9462
      3525 9444 3450 9447 3450 9486
TIME...MOT...LOC 2301Z 220DEG 41KT 3531 9501 3503 9459
          3468 9455

$$

OKC061-077-079-112315-
/O.CON.KTSA.SV.W.0250.000000T0000Z-110511T2315Z/
HASKELL OK-LE FLORE OK-LATIMER OK-
601 PM CDT WED MAY 11 2011

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR
NORTHEASTERN LATIMER...LE FLORE AND HASKELL COUNTIES...

AT 557 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM KANIMA TO HOWE TO BIG CEDAR...MOVING NORTHEAST AT 45
MPH.

STORM HAZARDS INCLUDE...
DAMAGING WIND GUSTS TO 70 MPH...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...SHADY
POINT...PANAMA...TAMAHA...CAMERON...COWLINGTON...SPIRO...
SCULLYVILLE...POCOLA AND ROCK ISLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS. SEEK SHELTER
IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.
MOBILE HOMES AND HIGH PROFILE VEHICLES ARE ESPECIALLY SUSCEPTIBLE TO
HIGH WINDS AND MAY BE OVERTURNED.

&&

LAT...LON 3480 9491 3508 9535 3542 9506 3538 9489
      3536 9490 3535 9491 3537 9485 3532 9481
      3534 9478 3532 9468 3529 9466 3530 9462
      3525 9444 3450 9447 3450 9486
TIME...MOT...LOC 2301Z 220DEG 41KT 3531 9501 3503 9459
          3468 9455

$$

042 
WWUS54 KTSA 112311
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
611 PM CDT WED MAY 11 2011

OKC061-077-079-112321-
/O.EXP.KTSA.SV.W.0250.000000T0000Z-110511T2315Z/
HASKELL OK-LE FLORE OK-LATIMER OK-
611 PM CDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LATIMER...LE
FLORE AND HASKELL COUNTIES EXPIRES AT 615 PM CDT...

THE THUNDERSTORM HAS MOVED OUT OF THE WARNED AREA...THEREFORE THE
SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 7 PM.

LAT...LON 3480 9491 3508 9535 3542 9506 3538 9489
      3536 9490 3535 9491 3537 9485 3532 9481
      3534 9478 3532 9468 3529 9466 3530 9462
      3525 9444 3450 9447 3450 9486
TIME...MOT...LOC 2311Z 220DEG 41KT 3540 9492 3512 9450
          3477 9446

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 11, 3:48 PM CDT, 1 hour 21 minutes earlier.

Area forecast discussion, May 11, 3:48 PM CDT, 1 hour 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
348 PM CDT WED MAY 11 2011

.DISCUSSION...
CURRENTLY....AN AREA OF THUNDERSTORMS TO POSSIBLY SEVERE
THUNDERSTORM WERE MOVING ACROSS CENTRAL OKLAHOMA AND CENTRAL
TEXAS AHEAD OF A DRY LINE POSITIONED ACROSS THE OKLAHOMA AND TEXAS
PANHANDLES. THIS AREA OF CONVECTION WILL BE THE MAIN CONCERN WITH
THE FORECAST PACKAGE.

THIS ACTIVITY WILL CONTINUE TO PUSH OUT AHEAD OF THE DRY LINE INTO
EASTERN OKLAHOMA THIS AFTERNOON AND ACROSS THE CWA THROUGH THE
EVENING AND INTO THE OVERNIGHT HOURS. MODERATE INSTABILITY AND
STEEP LOW- LEVEL LAPSE RATES OVER THE CWA WILL ALLOW FOR THE
POTENTIAL OF SEVERE WEATHER THROUGH THE EVENING HOURS. A SEVERE
THUNDERSTORM WATCH IS CURRENTLY IN EFFECT UNTIL 7 PM THIS EVENING
FOR MOST OF EASTERN OKLAHOMA. LARGE HAIL AND DAMAGING WINDS LOOK
TO BE THE MAIN THREATS.

CHANCES FOR SHOWERS AND THUNDERSTORMS WILL CONTINUE
OVERNIGHT AND TOMORROW AS AN UPPER LEVEL TROF MOVES INTO THE
CENTRAL PLAINS. DURING THE DAY TOMORROW THE COLD FRONT AND DRY
LINE WILL MAKE ANOTHER RUN TOWARDS EASTERN OKLAHOMA. THESE
BOUNDARIES SHOULD BE ABLE TO REACH CLOSE TO OSAGE AND PAWNEE
COUNTIES BY THURSDAY AFTERNOON. ALONG THE DRY LINE AND WITHIN THE
WARM SECTOR...THUNDERSTORMS TO POSSIBLY SEVERE THUNDERSTORMS ARE
EXPECTED TO DEVELOP AGAIN UNDER AN UNSTABLE ATMOSPHERE. ALL MODES
OF SEVERE WEATHER WILL BE POSSIBLE.

MODEL CONSENSUS INDICATED THAT THE COLD FRONT SHOULD OVERTAKE THE
DRY LINE THURSDAY EVENING AND FINALLY PUSH INTO THE CWA THURSDAY
NIGHT AND FRIDAY MORNING. THUNDERSTORMS WILL REMAIN POSSIBLE ALONG
AND AHEAD OF THE FRONT...WITH PRECIP BECOMING MOSTLY SHOWERS
BEHIND THE FRONT. BY FRIDAY EVENING...MOST OF THE PRECIP SHOULD BE
EXITING THE CWA. BEHIND THE COLD FRONT...TEMPS ARE EXPECTED TO
COOL INTO THE UPPER 40S TO LOWER 50 FRIDAY NIGHT AND CONTINUE TO
BE COOL AND BELOW THE NORMAL FOR MID MAY THROUGH THE WEEKEND.
FOLLOWED CLOSE TO GUIDANCE FOR TEMPS THROUGH THE SHORT TERM.

WITHIN THE EXTENDED FORECAST PACKAGE...A SECONDARY UPPER LEVEL LOW
LOOKS TO SPIN OFF THE MAIN TROF SUNDAY NIGHT AND INTO MONDAY. THIS
WAVE SHOULD FOR THE MOST PART REMAIN TO THE NORTHEAST OF THE CWA
AND THUS WILL KEEP THE FORECAST DRY DURING THIS TIME PERIOD. A WEAK
RIDGE DEVELOPS OVER THE PLAINS FOR THE FIRST HALF OF THE NEXT WORK
WEEK. TEMPS DURING THIS TIME PERIOD SHOULD BE ABLE TO REBOUND BACK
INTO THE 70S BY TUESDAY AND WEDNESDAY. MODELS DIVERGE ON SOLUTIONS
HEADING INTO LATE NEXT WEEK WITH ANOTHER WAVE MOVING IN FROM THE
WEST. FOR NOW WILL FOLLOW PREVIOUS FORECASTS WITH DRY CONDITIONS
THROUGH WEDNESDAY. WILL CONTINUE TO MONITOR AND UPDATE AS MODEL
TRENDS BECOME MORE IN LINE WITH EACH OTHER.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   68  81  55  68 /  60  40  50  30
FSM   68  83  60  73 /  50  40  70  40
MLC   69  83  56  71 /  70  40  50  20
BVO   66  81  53  66 /  60  30  30  30
FYV   67  80  56  68 /  50  40  70  40
BYV   68  81  57  69 /  50  40  70  40
MKO   68  82  56  68 /  60  40  50  30
MIO   67  82  55  67 /  60  40  40  40
F10   68  82  54  70 /  60  40  50  20
HHW   69  82  60  73 /  60  50  70  10

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
AR...NONE.
&&

SHORT TERM...18
LONG TERM....20

Hazardous weather outlook, May 11, 4:52 PM CDT, 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
452 PM CDT WED MAY 11 2011

ARZ001-002-010-011-019-020-029-OKZ049-053>076-121000-
ADAIR OK-BENTON AR-CARROLL AR-CHEROKEE OK-CHOCTAW OK-CRAIG OK-
CRAWFORD AR-CREEK OK-DELAWARE OK-FRANKLIN AR-HASKELL OK-LATIMER OK-
LE FLORE OK-MADISON AR-MAYES OK-MCINTOSH OK-MUSKOGEE OK-NOWATA OK-
OKFUSKEE OK-OKMULGEE OK-OSAGE OK-OTTAWA OK-PAWNEE OK-PITTSBURG OK-
PUSHMATAHA OK-ROGERS OK-SEBASTIAN AR-SEQUOYAH OK-TULSA OK-WAGONER OK-
WASHINGTON OK-WASHINGTON AR-
452 PM CDT WED MAY 11 2011

...SEVERE WEATHER LIKELY INTO THE EVENING...

THIS OUTLOOK IS FOR NORTHWEST AND WEST CENTRAL ARKANSAS AS WELL AS
MUCH OF EASTERN OKLAHOMA.

.DAY ONE...THIS EVENING AND OVERNIGHT.
TORNADO.
	RISK...LIMITED.
	AREA...PRIMARILY SOUTH OF INTERSTATE 40.
	ONSET...ONGOING.

SEVERE THUNDERSTORM.
	RISK...ELEVATED.
	AREA...ALL EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
        ONSET...ONGOING.

HEAVY RAIN.
	RISK...LIMITED.
	AREA...EASTERN OKLAHOMA AND WEST CENTRAL ARKANSAS.
	ONSET...ONGOING.

SIGNIFICANT WINDS.
	RISK...LIMITED.
	AREA...ALL EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...ONGOING.

DISCUSSION...
STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE OVER PARTS OF EASTERN
OKLAHOMA LATE THIS AFTERNOON...AND CONTINUE EASTWARD INTO NORTHWEST
ARKANSAS BY EARLY EVENING. THE MAIN SEVERE WEATHER THREAT WILL BE
LARGE HAIL AND DAMAGING WINDS...ALTHOUGH WIND SHEAR IS SUFFICIENT
FOR A LIMITED TORNADIC RISK INTO THE EARLY EVENING...PRIMARILY WITH
THE LINE OF STORMS MOVING ACROSS FAR SOUTHEAST OKLAHOMA.

WHILE WIND SHEAR WILL WEAKEN ACROSS FAR EASTERN OKLAHOMA AND WEST
CENTRAL ARKANSAS...HIGH INSTABILITY SHOULD ALLOW FOR THESE STORMS TO
MAINTAIN STRENGTH AND SEVERITY AS THEY ENTER WESTERN ARKANSAS AFTER
6 OR 7 PM. ADDITIONALLY...PERIODS OF HEAVY RAIN WILL ACCOMPANY THE
STORMS AS THEY TRACK EASTWARD THROUGH THE AREA WITH RAINFALL AMOUNTS
OF ONE TO TWO INCHES LIKELY.

STORMS ARE EXPECTED TO EITHER MOVE OUT OF THE AREA OR SLOWLY WEAKEN
BY MID TO LATE EVENING.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
REGIONAL SPOTTER NETWORKS SHOULD BE ACTIVATED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
THURSDAY...SEVERE THUNDERSTORM POTENTIAL...HIGH WIND POTENTIAL.
FRIDAY...THUNDERSTORM POTENTIAL.
SATURDAY THROUGH TUESDAY...NO HAZARDS.

EXTENDED DISCUSSION...
SEVERE THUNDERSTORM CHANCES WILL CONTINUE ON THURSDAY AS A
COLD FRONT MOVES INTO THE REGION...AND STRONG INSTABILITY
BUILDS BY THE AFTERNOON.  ADDITIONALLY...WINDS ALOFT WILL
BE STRONGER AS THE PRIMARY STORM SYSTEM ALOFT MOVES NEARER
THE REGION.  THIS COMBINATION OF INSTABILITY AND WIND SHEAR
WILL FAVOR SUPERCELLS CAPABLE OF DAMAGING HAIL AND POSSIBLY
A TORNADIC RISK.  THUNDERSTORM CHANCES CONTINUE ON FRIDAY
IN VICINITY OF THE STORM SYSTEM ALOFT...THOUGH SEVERE WEATHER
CHANCES WILL DECREASE MARKEDLY.

COOLER AND DRY WEATHER IS FORECAST FOR THE WEEKEND INTO
EARLY NEXT WEEK.

WWW.SRH.NOAA.GOV/TULSA CONTAINS ADDITIONAL INFORMATION.

In the hours before

Special weather statement, May 11, 4:19 PM CDT, 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
419 PM CDT WED MAY 11 2011

OKZ065-066-071-073-112200-
MCINTOSH OK-OKFUSKEE OK-OKMULGEE OK-PITTSBURG OK-
419 PM CDT WED MAY 11 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 500 PM CDT
FOR THE FOLLOWING COUNTIES...

IN SOUTHEAST OKLAHOMA
     SOUTHWESTERN MCINTOSH AND WESTERN PITTSBURG

IN EAST CENTRAL OKLAHOMA
     OKFUSKEE

IN NORTHEAST OKLAHOMA
     SOUTHERN OKMULGEE

AT 417 PM CDT...STRONG THUNDERSTORMS WERE LOCATED 5 MILES NORTHWEST
OF ASHLAND TO NEAR BEARDEN...MOVING NORTHEAST AT 40 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED BY THESE STORMS INCLUDE...
WILSON...OKEMAH...WELEETKA...BEARDEN...CLEARVIEW...PHAROAH...
CASTLE...PADEN...BOLEY...MASON...OKFUSKEE...WELTY...HENRYETTA...
BRYANT...DEWAR...HANNA...VERNON...KIOWA...PITTSBURG...
ASHLAND...SAVANNA...HAYWOOD...ARPELAR...SCIPIO AND INDIANOLA.

THESE STORMS WILL BE CAPABLE OF PRODUCING PENNY SIZE HAIL AND WIND
GUSTS TO 50 MPH. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE
THE SIGNIFICANT WEATHER ADVISORY IS UPGRADED TO A WARNING.

LAT...LON 3564 9663 3564 9619 3538 9582 3508 9574
      3468 9584 3469 9610 3505 9610 3516 9599
      3528 9599 3529 9644 3545 9645 3543 9649
      3545 9655 3539 9654 3540 9660 3549 9664
TIME...MOT...LOC 2117Z 217DEG 33KT 3484 9612

Special weather statement, May 11, 4:28 PM CDT, 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
428 PM CDT WED MAY 11 2011

OKZ059-064-112200-
CREEK OK-PAWNEE OK-
428 PM CDT WED MAY 11 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 500 PM CDT
FOR THE FOLLOWING COUNTIES...

IN NORTHEAST OKLAHOMA
     NORTHWESTERN CREEK AND PAWNEE

AT 428 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 2 MILES EAST OF
DRUMRIGHT...MOVING NORTH AT 45 MPH. SOME LOCATIONS THAT WILL BE
AFFECTED BY THIS STORM INCLUDE...JENNINGS...TERLTON...HALLETT...
DRUMRIGHT...OILTON AND SILVER CITY.

THIS STORM WILL BE CAPABLE OF PRODUCING NICKEL SIZE HAIL AND WIND
GUSTS TO 50 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING WIND GUSTS
TO 50 MPH. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE THE
SIGNIFICANT WEATHER ADVISORY IS UPGRADED TO A WARNING.

LAT...LON 3627 9666 3624 9637 3592 9646 3595 9663
      3602 9663 3615 9663 3616 9665
TIME...MOT...LOC 2128Z 182DEG 37KT 3604 9656

Special weather statement, May 11, 4:44 PM CDT, 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
444 PM CDT WED MAY 11 2011

OKZ054-112200-
OSAGE OK-
444 PM CDT WED MAY 11 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 500 PM CDT
FOR THE FOLLOWING COUNTY...

IN NORTHEAST OKLAHOMA
     NORTHERN OSAGE

AT 444 PM CDT...A STRONG THUNDERSTORM WAS LOCATED OVER OSAGE
COUNTY...MOVING NORTH AT 35 MPH..

THIS STORM WILL BE CAPABLE OF PRODUCING NICKEL SIZE HAIL AND WIND
GUSTS TO 50 MPH. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE
THE SIGNIFICANT WEATHER ADVISORY IS UPGRADED TO A WARNING.

LAT...LON 3700 9619 3681 9634 3686 9655 3700 9652
      3701 9647
TIME...MOT...LOC 2144Z 196DEG 30KT 3693 9641

Local storm report, May 11, 4:47 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
447 PM CDT WED MAY 11 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0353 PM     NON-TSTM WND DMG 1 W BOSWELL             34.03N 95.89W
05/11/2011                   CHOCTAW            OK   COUNTY OFFICIAL

            POWER POLES DOWNED WEST SIDE OF TOWN BY THUNDERSTORM
            WINDS. REPORT FROM CITY HALL. TIME ESTIMATED FROM RADAR.

&&

JDS

Local storm report, May 11, 4:49 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
449 PM CDT WED MAY 11 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0353 PM     TSTM WND DMG     1 W BOSWELL             34.03N 95.89W
05/11/2011                   CHOCTAW            OK   COUNTY OFFICIAL

            POWER POLES DOWNED WEST SIDE OF TOWN BY THUNDERSTORM
            WINDS. REPORT FROM CITY HALL. TIME ESTIMATED FROM RADAR.

&&

JDS

Local storm report, May 11, 4:55 PM CDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
455 PM CDT WED MAY 11 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0447 PM     TSTM WND DMG     HENRYETTA               35.44N 95.98W
05/11/2011                   OKMULGEE           OK   FIRE DEPT/RESCUE

            TREES DOWNED BY THUNDERSTORM WINDS IN HENRYETTA. REPORT
            FROM VOLUNTEER FIRE DEPARTMENT.

&&

JDS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 2:28 PM CDT	Special Weather Statement	TSA	Pawnee	62 min
May 11, 3:18 PM CDT	Severe Thunderstorm Warning	TSA	Osage	27 min
May 11, 3:25 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	65 min
May 11, 3:54 PM CDT	Special Weather Statement	TSA	Pawnee	36 min
May 11, 4:01 PM CDT	Special Weather Statement	TSA	Washington	29 min
May 11, 4:05 PM CDT	Special Weather Statement	TSA	Creek	25 min
May 11, 4:07 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	53 min
May 11, 4:19 PM CDT	Special Weather Statement	TSA	Okfuskee	41 min
May 11, 4:25 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Washington	50 min
May 11, 4:28 PM CDT	Special Weather Statement	TSA	Creek	32 min
May 11, 4:29 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Latimer, Pittsburg, Pushmataha	61 min
May 11, 4:41 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee	49 min
May 11, 4:43 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee, Okfuskee, Okmulgee	47 min
May 11, 4:51 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa	39 min
May 11, 5:06 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa, Washington	39 min
May 11, 5:11 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Rogers, Washington	49 min
May 11, 5:18 PM CDT	Areal Flood Advisory	TSA	Creek, Osage, Rogers, Tulsa, Wagoner	117 min
May 11, 5:18 PM CDT	Special Weather Statement	TSA	Tulsa	27 min
May 11, 5:26 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Craig, Creek, Haskell, McIntosh, Mayes and 5 more	64 min
May 11, 5:31 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Rogers, Tulsa, Washington	59 min
May 11, 6:01 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Washington	29 min
May 11, 6:07 PM CDT	Areal Flood Advisory	TSA	Nowata, Washington	113 min
May 11, 6:08 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Haskell, LeFlore, Sequoyah	52 min
May 11, 6:15 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes, Nowata, Ottawa	60 min
May 11, 6:57 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Delaware	33 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011 Every severe thunderstorm warning in 2011

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.