Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 176, NWS Tulsa, OK

August 18, 2014LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 18, 2014, 4:11 PM CDT for LeFlore County, Oklahoma. It was in force for 64 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: Aug 18, 2014, 4:11 PM CDT (21:11 UTC)
Expired: Aug 18, 2014, 5:15 PM CDT
In force: 64 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 78 km from the middle of the area, began a volume at 21:13 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 9.2 hours before the alert went out and 245 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: 292 J/kg
Mixed-layer CIN: -280 J/kg
Mixed-layer LCL: 1396 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: -106 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.

684 
WUUS54 KTSA 182111
SVRTSA
OKC079-182215-
/O.NEW.KTSA.SV.W.0176.140818T2111Z-140818T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
411 PM CDT MON AUG 18 2014

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LE FLORE COUNTY IN SOUTHEAST OKLAHOMA...

* UNTIL 515 PM CDT

* AT 408 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM FANSHAWE TO 10 MILES SOUTHEAST OF HEAVENER RUNESTONE
  STATE PARK...AND MOVING SOUTH AT 20 MPH.

  HAZARD...60 MPH WIND GUSTS AND NICKEL SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...HODGEN...TALIMENA STATE
  PARK...WHITESBORO...MUSE...BIG CEDAR...HONOBIA AND OCTAVIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3468 9494 3468 9498 3478 9504 3495 9496
      3489 9444 3455 9445 3450 9447 3450 9494
TIME...MOT...LOC 2111Z 345DEG 17KT 3491 9490 3481 9443

HAIL...0.88IN
WIND...60MPH

$$

2 follow-up statements

633 
WWUS54 KTSA 182145
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
445 PM CDT MON AUG 18 2014

OKC079-182215-
/O.CON.KTSA.SV.W.0176.000000T0000Z-140818T2215Z/
LE FLORE OK-
445 PM CDT MON AUG 18 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN LE
FLORE COUNTY UNTIL 515 PM CDT...

AT 443 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM TALIMENA STATE PARK TO 7 MILES WEST OF HATFIELD...AND
MOVING SOUTH AT 20 MPH.

HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

LOCATIONS IN OR NEAR THE PATH INCLUDE...WHITESBORO...OCTAVIA AND
  HONOBIA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3468 9494 3468 9498 3478 9504 3489 9498
      3479 9444 3455 9445 3450 9447 3450 9494
TIME...MOT...LOC 2145Z 345DEG 17KT 3476 9493 3450 9449

HAIL...0.75IN
WIND...60MPH

$$

530 
WWUS54 KTSA 182213
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
513 PM CDT MON AUG 18 2014

OKC079-182224-
/O.EXP.KTSA.SV.W.0176.000000T0000Z-140818T2215Z/
LE FLORE OK-
513 PM CDT MON AUG 18 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN LE FLORE COUNTY WILL
EXPIRE AT 515 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED
OUT OF THE WARNED AREA.

LAT...LON 3468 9494 3468 9498 3478 9504 3489 9498
      3479 9444 3455 9445 3450 9447 3450 9494
TIME...MOT...LOC 2214Z 345DEG 17KT 3463 9489 3437 9445

$$

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 Aug 18, 2:44 PM CDT, 1 hour 27 minutes earlier.

Area forecast discussion, Aug 18, 2:44 PM CDT, 1 hour 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
244 PM CDT MON AUG 18 2014

.DISCUSSION...

STRONG TO SEVERE THUNDERSTORMS ARE ONGOING EARLY THIS AFTERNOON
ACROSS PORTIONS OF EASTERN OKLAHOMA AND WESTERN ARKANSAS IN
RESPONSE TO AN UPPER LEVEL DISTURBANCE MOVING EASTWARD THROUGH
THE REGION. THESE STORMS WILL LIKELY BE EAST OF THE FORECAST AREA
BY LATE THIS AFTERNOON/EARLY THIS EVENING AND SHOULD TEND TO
DIMINISH IN INTENSITY AND AREAL COVERAGE. NOT PLANNING ON CARRYING
A MENTION OF SHOWERS/STORMS INTO THE EVENING HOURS AT THIS TIME.
TOWARD SUNRISE...THUNDERSTORMS SHOULD DEVELOP ALONG A WARM FRONT IN
KANSAS AND MISSOURI. ALTHOUGH THERE IS SOME POTENTIAL FOR THESE
STORMS TO DEVELOP SOUTH OF THE OKLAHOMA AND ARKANSAS BORDERS...MOST
OF THE RAIN WILL REMAIN NORTH OF THE AREA. WILL CARRY A SLIGHT
CHANCE OF ADDITIONAL STORMS LATE TONIGHT AND INTO TOMORROW MORNING
IN PRIMARILY FAR NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS TO
COVER THIS POTENTIAL. THIS LOOKS TO BE THE ONLY ADDITIONAL SHOT AT
RAIN AND THUNDERSTORMS DURING THIS FORECAST PERIOD.

PROLONGED UPPER LEVEL RIDGING MORE TYPICAL OF THIS TIME OF YEAR
THAN THE ACTIVE PATTERN THE AREA HAS BEEN TREATED TO THIS SUMMER
WILL CONTINUE BUILD INTO THE CENTRAL PORTION OF THE UNITED STATES
AND PERSIST THROUGH THE WEEKEND. BOTH THE ECMWF AND GFS FORECAST
THE RIDGE TO BREAKDOWN TOWARD THE EARLY TO MIDDLE PART OF NEXT
WEEK...BUT UNTIL THEN...ABOVE NORMAL TEMPERATURES WILL BE THE
RULE...WITH SOME POTENTIAL FOR TRIPLE DIGITS. DURING THE THURSDAY
TO FRIDAY TIME FRAME...HEAT INDICES MAY NEAR THE CRITICAL 105
DEGREE HEAT ADVISORY CRITERION...SO HEAT ADVISORIES OR POSSIBLY
EXCESSIVE HEAT WARNINGS MAY BECOME NECESSARY LATER IN THE WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   74  98  76  97 /  20  10  10  10
FSM   73  97  74  97 /  10  10   0  10
MLC   73  96  75  96 /  10  10   0   0
BVO   71  98  72  98 /  20  20  10  10
FYV   70  94  70  93 /  20  20  10  10
BYV   70  94  71  94 /  20  20  10  10
MKO   71  96  73  96 /  10  10   0   0
MIO   72  97  73  97 /  20  20  10  10
F10   72  95  74  95 /  10  10   0   0
HHW   71  97  73  96 /  10  10   0   0

&&

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

SHORT TERM...30
LONG TERM....22

Hazardous weather outlook, Aug 18, 3:12 PM CDT, 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
312 PM CDT MON AUG 18 2014

ARZ001-002-010-011-019-020-029-OKZ049-053>076-191000-
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-
300 PM CDT MON AUG 18 2014

...DAMAGING WIND AND HAIL POTENTIAL WITH COMPLEX OF STORMS THIS AFTERNOON...

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SEVERE THUNDERSTORM.
	RISK...CRITICAL.
	AREA...FAR EASTERN OKLAHOMA AND WEST CENTRAL ARKANSAS.
	ONSET...ONGOING.

	AREA AT GREATEST RISK...FORT SMITH AREA.

DANGEROUS HEAT.
	RISK...LIMITED.
	AREA...EASTERN OKLAHOMA.
	ONSET...ONGOING.

DISCUSSION...

A COMPLEX OF STORMS MOVING ACROSS FAR EASTERN OKLAHOMA INTO WEST
CENTRAL ARKANSAS WILL BRING DAMAGING WIND AND SEVERE HAIL
POTENTIAL TO THIS REGION THIS AFTERNOON. OTHER ISOLATED STORMS MAY
DEVELOP ALONG OUTFLOW BOUNDARIES OVER EASTERN OKLAHOMA...WITH
SEVERE WIND/HAIL POTENTIAL AS WELL.

HEAT INDICES WILL BE IN THE 100 TO 105 DEGREE RANGE IN SPOTS
ACROSS EASTERN OKLAHOMA THAT HAVE NOT BEEN IMPACTED BY TODAY'S
STORMS.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
ACTIVATION OF THE REGIONAL SPOTTER NETWORK EXPECTED.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
TUESDAY...THUNDERSTORM POTENTIAL...DANGEROUS HEAT POTENTIAL.
WEDNESDAY...NO HAZARDS.
THURSDAY AND FRIDAY...DANGEROUS HEAT POTENTIAL.
SATURDAY AND SUNDAY...NO HAZARDS.

EXTENDED DISCUSSION...

THUNDERSTORM CHANCES WILL REMAIN POSSIBLE INTO TUESDAY BEFORE A
WEAK FRONTAL BOUNDARY NEAR THE REGION FINALLY LIFTS NORTHEAST. IN
THE WAKE OF THE EXITING BOUNDARY...A RIDGE OF HIGH PRESSURE IS
FORECAST TO SET UP OVER THE SOUTHERN PLAINS...CONTINUING HOT
TEMPERATURES FOR EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.

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

LACY

In the hours before

Special weather statement, Aug 18, 3:39 PM CDT, 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
339 PM CDT MON AUG 18 2014

OKZ076-182115-
LE FLORE OK-
339 PM CDT MON AUG 18 2014

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 415 PM CDT
FOR THE FOLLOWING COUNTY...

IN SOUTHEAST OKLAHOMA
     CENTRAL LE FLORE

AT 339 PM CDT...STRONG THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM MILTON TO 4 MILES SOUTH OF SHADY POINT...MOVING SOUTH
AT 35 MPH. SOME LOCATIONS THAT WILL BE AFFECTED BY THESE STORMS
INCLUDE...HOWE...SHADY POINT...MILTON...PANAMA AND BOKOSHE.

THESE STORMS WILL BE CAPABLE OF PRODUCING PENNY SIZE HAIL AND WIND
GUSTS TO 50 MPH.

LAT...LON 3494 9461 3502 9493 3508 9493 3521 9488
      3521 9487 3517 9467
TIME...MOT...LOC 2039Z 346DEG 30KT 3512 9485 3505 9464

Local storm report, Aug 18, 3:45 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
345 PM CDT MON AUG 18 2014

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

0344 PM     TSTM WND GST     POTEAU                  35.05N 94.62W
08/18/2014  E50 MPH          LE FLORE           OK   EMERGENCY MNGR

&&

GEW

Special weather statement, Aug 18, 3:57 PM CDT, 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
357 PM CDT MON AUG 18 2014

OKZ054-059-060-064-182130-
CREEK OK-OSAGE OK-PAWNEE OK-TULSA OK-
357 PM CDT MON AUG 18 2014

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 430 PM CDT
FOR THE FOLLOWING COUNTIES...

IN NORTHEAST OKLAHOMA
     NORTHEASTERN CREEK...SOUTHERN OSAGE...EASTERN PAWNEE AND WESTERN
     TULSA

AT 356 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 6 MILES NORTHWEST
OF KELLYVILLE...MOVING SOUTHEAST AT 5 MPH. OTHER STORMS WERE
DEVELOPING NEAR KEYSTONE STATE PARK AND WESTPORT. SOME LOCATIONS
THAT WILL BE AFFECTED BY THIS STORM
INCLUDE...WESTPORT...KIEFER...MANNFORD...KELLYVILLE...SAPULPA...WALNU
T CREEK STATE PARK AND KEYSTONE STATE PARK.

THESE STORMS WILL BE CAPABLE OF PRODUCING PEA TO DIME SIZE HAIL AND
WIND GUSTS TO 45 MPH.

LAT...LON 3594 9602 3579 9636 3624 9647 3629 9629
TIME...MOT...LOC 2056Z 324DEG 4KT 3600 9628

LACY

Local storm report, Aug 18, 4:01 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
401 PM CDT MON AUG 18 2014

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

0355 PM     TSTM WND GST     3 ENE WISTER            34.98N 94.68W
08/18/2014  M63 MPH          LE FLORE           OK   MESONET

&&

JBM

Local storm report, Aug 18, 4:03 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
403 PM CDT MON AUG 18 2014

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

0125 PM     TSTM WND DMG     3 SW ELDON              35.90N 94.88W
08/18/2014                   CHEROKEE           OK   POST OFFICE

            TREES DOWNED IN TOWN OF WELLING. ESTIMATED TIME FROM
            RADAR.

&&

GEW

Local storm report, Aug 18, 4:06 PM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
406 PM CDT MON AUG 18 2014

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

0400 PM     TSTM WND DMG     WISTER                  34.97N 94.72W
08/18/2014                   LE FLORE           OK   EMERGENCY MNGR

            TREES DOWN AND POWER OUTAGES

&&

JBM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 3:15 AM CDT	Special Weather Statement	TSA	Osage, Pawnee	45 min
Aug 18, 11:32 AM CDT	Special Weather Statement	TSA	Mayes	28 min
Aug 18, 12:47 PM CDT	Special Weather Statement	TSA	Cherokee	43 min
Aug 18, 1:13 PM CDT	Special Weather Statement	TSA	Cherokee	32 min
Aug 18, 1:15 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee	45 min
Aug 18, 1:40 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee	35 min
Aug 18, 1:59 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Sequoyah	46 min
Aug 18, 2:32 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	43 min
Aug 18, 2:52 PM CDT	Special Weather Statement	TSA	Haskell	38 min
Aug 18, 3:09 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	51 min
Aug 18, 3:31 PM CDT	Special Weather Statement	TSA	Creek	29 min
Aug 18, 3:39 PM CDT	Special Weather Statement	TSA	LeFlore	36 min
Aug 18, 3:47 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	43 min
Aug 18, 3:57 PM CDT	Special Weather Statement	TSA	Creek	33 min
Aug 18, 4:26 PM CDT	Special Weather Statement	TSA	Creek	49 min
Aug 18, 4:39 PM CDT	Areal Flood Advisory	TSA	Creek, Pawnee, Tulsa	3 hr
Aug 18, 5:03 PM CDT	Special Weather Statement	TSA	Pawnee	27 min
Aug 18, 5:29 PM CDT	Special Weather Statement	TSA	Pawnee	31 min
Aug 18, 5:48 PM CDT	Areal Flood Advisory	TSA	Pawnee	117 min
Aug 18, 5:59 PM CDT	Flash Flood Warning	TSA	Pawnee	4 hr
Aug 18, 6:03 PM CDT	Special Weather Statement	TSA	Creek	27 min
Aug 18, 6:06 PM CDT	Special Weather Statement	TSA	Creek	24 min
Aug 18, 6:31 PM CDT	Special Weather Statement	TSA	Creek	14 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2014 Every severe thunderstorm warning in 2014

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.