Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 97, NWS Tulsa, OK

April 9, 2015LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 9, 2015, 6:40 PM CDT for LeFlore County, Oklahoma. It was in force for 35 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 9, 2015, 6:40 PM CDT (23:40 UTC)
Expired: Apr 9, 2015, 7:15 PM CDT
In force: 35 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 91 km from the middle of the area, began a volume at 23:40 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 9, 2:32 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.7 hours before the alert went out and 248 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: 1639 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 600 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 396 m²/s²
0-3 km storm-relative helicity: 520 m²/s²
Significant tornado parameter: 3.4
Supercell composite: 21.8

Open this sounding in Storm Lab

The text

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

026 
WUUS54 KTSA 092340
SVRTSA
OKC079-100015-
/O.NEW.KTSA.SV.W.0097.150409T2340Z-150410T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
640 PM CDT THU APR 9 2015

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

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

* UNTIL 715 PM CDT

* AT 638 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 11 MILES EAST OF
  NASHOBA...AND MOVING EAST AT 45 MPH.

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

  SOURCE...RADAR INDICATED.

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
           ROOFS...SIDING AND TREES.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3459 9494 3459 9461 3450 9461 3450 9494
TIME...MOT...LOC 2341Z 272DEG 38KT 3451 9498

HAIL...1.00IN
WIND...60MPH

$$

LACY

2 follow-up statements

503 
WWUS54 KTSA 092357
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
657 PM CDT THU APR 9 2015

OKC079-100015-
/O.CON.KTSA.SV.W.0097.000000T0000Z-150410T0015Z/
LE FLORE OK-
657 PM CDT THU APR 9 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
LE FLORE COUNTY UNTIL 715 PM CDT...

AT 655 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 6 MILES WEST OF
OCTAVIA...AND MOVING EAST AT 45 MPH.

HAZARD...70 MPH WIND GUSTS AND PENNY SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...EXPECT CONSIDERABLE TREE DAMAGE. DAMAGE IS LIKELY TO MOBILE
         HOMES...ROOFS AND OUTBUILDINGS.

LOCATIONS IN OR NEAR THE PATH INCLUDE...OCTAVIA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3450 9486 3459 9487 3459 9461 3450 9461
TIME...MOT...LOC 2357Z 269DEG 37KT 3452 9477

HAIL...0.75IN
WIND...70MPH

$$

308 
WWUS54 KTSA 100012
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
712 PM CDT THU APR 9 2015

OKC079-100022-
/O.EXP.KTSA.SV.W.0097.000000T0000Z-150410T0015Z/
LE FLORE OK-
712 PM CDT THU APR 9 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL LE FLORE COUNTY
WILL EXPIRE AT 715 PM CDT...

THE STORM WHICH PROMPTED THE WARNING AND MOVED THROUGH OCTAVIA HAS 
MOVED OUT OF THE WARNED AREA.

LAT...LON 3450 9486 3459 9487 3459 9461 3450 9461
TIME...MOT...LOC 0012Z 269DEG 37KT 3452 9458

$$

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 Apr 9, 5:56 PM CDT, 44 minutes earlier.

Area forecast discussion, Apr 9, 5:56 PM CDT, 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
556 PM CDT THU APR 9 2015

.AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
FOR THE 0Z TAFS... STRONG AND GUSTY NORTHWEST WINDS IN THE WAKE OF
A DEPARTING COLD FRONT WILL CONTINUE TO AFFECT ALL SITES THROUGH
THE OVERNIGHT HOURS. THUNDERSTORMS WITH MVFR CONDITIONS MAY
CONTINUE TO AFFECT FSM OVER THE NEXT HOUR AS THE LAST OF THE
PRECIPITATION MOVES OUT OF THE AREA. CEILINGS WILL LIFT AND SKIES WILL
CLEAR OUT AREAWIDE OVERNIGHT... LEAVING VFR CONDITIONS AT ALL SITES FOR
THE REMAINDER OF THE 24 HOUR FORECAST PERIOD.

&&

.PREV DISCUSSION... /ISSUED 227 PM CDT THU APR 9 2015/

DISCUSSION...

COLD FRONT IS QUICKLY SWEEPING EAST ACROSS THE FORECAST AREA THIS
AFTERNOON...IN ASSOCIATION WITH A PV MAX MOVING EAST NORTHEAST
ACROSS NEBRASKA AND KANSAS. A STRONG CAPPING INVERSION REMAINS IN
PLACE AHEAD OF THE FRONT...AND THUS FAR ECHOES HAVE STRUGGLED TO
GET GOING. HOWEVER...EVENTUALLY LIFT AND HEATING SHOULD OVERCOME
THE CAP AND AT LEAST SCATTERED STORMS WILL FIRE ALONG THE FRONT BY
MID AFTERNOON FROM NW AR DOWN INTO SE OK. THE STORMS MAY
EVENTUALLY BECOME MORE LINEAR WITH TIME. WINDS ALOFT AT THE BASE
OF THE CENTRAL CONUS TROUGH SUGGEST SHEAR IS STRONG ENOUGH FOR
SUPERCELL DEVELOPMENT INITIALLY AT LEAST. THE TORNADO
THREAT...WHILE NOT ZERO...IS MUCH LESS COMPARED TO
YESTERDAY...WITH VEERED FLOW IN THE WARM SECTOR SHRINKING
HELICITY. THUS MAIN THREATS WILL BE HAIL/WINDS. ACTIVITY SHOULD BE
CLEARING THE AREA BETWEEN 00Z AND 03Z...WITH A CLEAR AND COOL
NIGHT FORTHCOMING.

AFTER A NICE DAY TO BE OUTDOORS ON FRIDAY...RAIN/STORM CHANCES
WILL RETURN BY SATURDAY...ESPECIALLY SATURDAY NIGHT AS THE
RETREATING BOUNDARY LIFTS NORTH THRU THE PLAINS. A WAVE IN THE
NORTHERN STREAM WILL SWEEP ACROSS THE MIDWEST BY THE LATTER PART
OF THE WEEKEND...FORCING ANOTHER BOUNDARY DOWN INTO OUR REGION.

GOING INTO EARLY NEXT WEEK...AN UPPER WAVE IN THE WEAKER SOUTHERN
STREAM OF THE WESTERLIES WILL LIFT INTO THE PLAINS...BRINGING GOOD
CHANCES FOR RAIN/STORMS.

A VIGOROUS UPPER STORM SYSTEM IS FORECAST TO DIVE IN FROM THE
PAC NW AND CLOSE OFF OVER THE PLAINS LATE NEXT WEEK. DEPENDING ON
HOW THE DETAILS SHAKE OUT...THERE WOULD BE SOME SEVERE POTENTIAL
AHEAD OF THE ASSOCIATED FRONT...FOLLOWED BY SOME COOLER AND DRIER
WEATHER TO CLOSE OUT THE WEEK.

LACY

&&

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

AVIATION...06

Hazardous weather outlook, Apr 9, 5:00 PM CDT, 1 hour 40 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
500 PM CDT THU APR 9 2015

ARZ001-002-010-011-019-020-029-OKZ049-053>076-101015-
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-
500 PM CDT THU APR 9 2015

...SEVERE WEATHER CONTINUES THROUGH EARLY EVENING...

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

.DAY ONE...TODAY AND TONIGHT.
TORNADO.
	RISK...LIMITED.
	AREA...NORTHWEST ARKANSAS AND FAR SOUTHEAST OKLAHOMA.
	ONSET...ONGOING.

SEVERE THUNDERSTORM.
	RISK...SIGNIFICANT.
	AREA...EAST OF A LINE FROM FAYETTEVILLE TO MCALESTER.
	ONSET...ONGOING.

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

FIRE WEATHER DANGER.
	RISK...LIMITED.
	AREA...NORTHEAST OKLAHOMA.
	ONSET...ONGOING.

DISCUSSION...
SEVERE THUNDERSTORMS ARE ONGOING ACROSS NORTHWEST ARKANSAS
INTO SOUTHEAST OKLAHOMA...AND WILL CONTINUE A SEVERE WEATHER
RISK AS THEY SPREAD EASTWARD WITH THE ADVANCING COLD FRONT.
LARGE HAIL IS PRIMARY HAZARD WITH THESE STORMS...THOUGH LOCALLY
DAMAGING WINDS ARE ALSO POSSIBLE ESPECIALLY WITHIN THE ARKANSAS
RIVER VALLEY INTO FAR SOUTHEAST OKLAHOMA.

THE SEVERE WEATHER POTENTIAL WILL END BY LATE EVENING AS THE COLD
FRONT PUSHES SOUTH OF THE RED RIVER.

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

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
FRIDAY...NO HAZARDS.
SATURDAY THROUGH WEDNESDAY...THUNDERSTORM POTENTIAL.

EXTENDED DISCUSSION...
THUNDERSTORM CHANCES RETURN TO THE REGION OVER THE WEEKEND
AND CONTINUE THROUGH MUCH OF NEXT WEEK AS THE WEATHER PATTERN
REMAINS UNSETTLED.

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

In the hours before

Special weather statement, Apr 9, 5:36 PM CDT, 1 hour 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
536 PM CDT THU APR 9 2015

OKZ049-073-092315-
PITTSBURG OK-PUSHMATAHA OK-
536 PM CDT THU APR 9 2015

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 615 PM CDT
FOR THE FOLLOWING COUNTIES...

IN SOUTHEAST OKLAHOMA
     SOUTHERN PITTSBURG AND CENTRAL PUSHMATAHA

AT 537 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 12 MILES NORTHWEST
OF EUBANKS...MOVING EAST AT 30 MPH. SOME LOCATIONS THAT WILL BE
AFFECTED BY THIS STORM INCLUDE...CLAYTON...STANLEY...EUBANKS AND
DUNBAR.

THIS STORM WILL BE CAPABLE OF PRODUCING NICKEL SIZE HAIL AND WIND
GUSTS TO 40 MPH.

LAT...LON 3443 9579 3450 9579 3451 9578 3451 9568
      3459 9568 3459 9582 3460 9582 3464 9531
      3439 9531
TIME...MOT...LOC 2237Z 268DEG 27KT 3450 9575

Local storm report, Apr 9, 5:59 PM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
559 PM CDT THU APR 09 2015

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

0508 PM     HAIL             PETTIGREW               35.82N 93.65W
04/09/2015  E1.00 INCH       MADISON            AR   PUBLIC

            RELAYED VIA SOCIAL MEDIA WITH PICTURE

&&

JBM

Local storm report, Apr 9, 6:02 PM CDT, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
602 PM CDT THU APR 09 2015

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

0412 PM     TSTM WND DMG     FAYETTEVILLE            36.06N 94.16W
04/09/2015                   WASHINGTON         AR   PUBLIC

            LARGE BRANCH BLOWN ONTO TREE. TIME ESTIMATED VIA RADAR.

&&

JBM

Local storm report, Apr 9, 6:03 PM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
603 PM CDT THU APR 09 2015

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

0550 PM     HAIL             SUMMERFIELD             34.90N 94.87W
04/09/2015  E1.25 INCH       LE FLORE           OK   EMERGENCY MNGR

            REPORTED BY THE LE FLORE COUNTY OFFICE OF EMERGENCY
            MANAGEMENT

&&

SFP

Special weather statement, Apr 9, 6:10 PM CDT, 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
610 PM CDT THU APR 9 2015

OKZ049-092345-
PUSHMATAHA OK-
610 PM CDT THU APR 9 2015

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 645 PM CDT
FOR THE FOLLOWING COUNTY...

IN SOUTHEAST OKLAHOMA
     CENTRAL PUSHMATAHA

AT 610 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 7 MILES SOUTHWEST
OF CLAYTON LAKE STATE PARK...MOVING EAST AT 40 MPH. SOME LOCATIONS
THAT WILL BE AFFECTED BY THIS STORM INCLUDE...CLAYTON...NASHOBA AND
CLAYTON LAKE STATE PARK.

THIS STORM WILL BE CAPABLE OF PRODUCING PENNY SIZE HAIL AND WIND
GUSTS TO 40 MPH.

LAT...LON 3442 9548 3459 9545 3459 9497 3450 9498
      3450 9504 3436 9504
TIME...MOT...LOC 2310Z 270DEG 33KT 3449 9539

LACY

Special weather statement, Apr 9, 6:33 PM CDT, 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
633 PM CDT THU APR 9 2015

OKZ049-053-100000-
CHOCTAW OK-PUSHMATAHA OK-
633 PM CDT THU APR 9 2015

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 700 PM CDT
FOR THE FOLLOWING COUNTIES...

IN SOUTHEAST OKLAHOMA
     NORTHERN CHOCTAW AND SOUTHWESTERN PUSHMATAHA

AT 634 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 8 MILES NORTHWEST
OF KENT...MOVING EAST AT 35 MPH. SOME LOCATIONS THAT WILL BE AFFECTED
BY THIS STORM INCLUDE...SAWYER...MESSER...KENT...FALLON...SPEER...
APPLE...DELA...RATTAN...OLETA AND HUGO LAKE STATE PARK.

THIS STORM WILL BE CAPABLE OF PRODUCING PENNY SIZE HAIL AND WIND
GUSTS TO 40 MPH. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE
THE SIGNIFICANT WEATHER ADVISORY IS UPGRADED TO A WARNING.

LAT...LON 3421 9532 3396 9535 3411 9578 3423 9575
TIME...MOT...LOC 2334Z 283DEG 28KT 3415 9572

LACY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 12:08 AM CDT	Special Weather Statement	TSA	Osage	37 min
Apr 9, 12:39 AM CDT	Special Weather Statement	TSA	Osage	51 min
Apr 9, 2:28 PM CDT	Special Weather Statement	TSA	Delaware	32 min
Apr 9, 2:34 PM CDT	Special Weather Statement	TSA	Delaware	26 min
Apr 9, 2:42 PM CDT	Special Weather Statement	TSA	Cherokee	33 min
Apr 9, 2:52 PM CDT	Special Weather Statement	TSA	Cherokee, Muskogee	38 min
Apr 9, 3:02 PM CDT	Special Weather Statement	TSA	Adair	28 min
Apr 9, 3:19 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee	41 min
Apr 9, 3:31 PM CDT	Severe Thunderstorm Warning	TSA	Adair	44 min
Apr 9, 3:36 PM CDT	Special Weather Statement	TSA	Latimer	39 min
Apr 9, 3:40 PM CDT	Special Weather Statement	TSA	Haskell	50 min
Apr 9, 3:46 PM CDT	Severe Thunderstorm Warning	TSA	Adair	44 min
Apr 9, 4:19 PM CDT	Severe Thunderstorm Warning	TSA	Adair	41 min
Apr 9, 4:32 PM CDT	Special Weather Statement	TSA	Latimer	28 min
Apr 9, 4:37 PM CDT	Special Weather Statement	TSA	Haskell	23 min
Apr 9, 4:51 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg	39 min
Apr 9, 4:58 PM CDT	Special Weather Statement	TSA	Sequoyah	32 min
Apr 9, 5:08 PM CDT	Special Weather Statement	TSA	Latimer	37 min
Apr 9, 5:29 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore	46 min
Apr 9, 5:36 PM CDT	Special Weather Statement	TSA	Pushmataha	39 min
Apr 9, 6:10 PM CDT	Special Weather Statement	TSA	Pushmataha	35 min
Apr 9, 6:17 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	43 min
Apr 9, 6:33 PM CDT	Special Weather Statement	TSA	Choctaw	27 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015 Every severe thunderstorm warning in 2015

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.