Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 366, NWS Tulsa, OK

July 19, 2009LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 19, 2009, 1:33 PM CDT for LeFlore County, Oklahoma. It was in force for 42 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: Jul 19, 2009, 1:33 PM CDT (18:33 UTC)
Expired: Jul 19, 2009, 2:15 PM CDT
In force: 42 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

County LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 78 km from the middle of the area, began a volume at 18:36 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

Shreveport, LA (KSHV), launched 12:00Z, 6.6 hours before the alert went out and 249 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: 457 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1343 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.8

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 191833
SVRTSA
OKC079-191915-
/O.NEW.KTSA.SV.W.0366.090719T1833Z-090719T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
133 PM CDT SUN JUL 19 2009

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

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

* UNTIL 215 PM CDT

* AT 133 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL AND WINDS
  TO 60 MPH. THIS STORM WAS LOCATED NEAR BIG CEDAR...MOVING SOUTHEAST
  AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3459 9480 3483 9462 3476 9444 3451 9445
      3450 9446 3450 9457
TIME...MOT...LOC 1834Z 298DEG 17KT 3468 9459

$$

2 follow-up statements

000 
WWUS54 KTSA 191850
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
150 PM CDT SUN JUL 19 2009

OKC079-191915-
/O.CON.KTSA.SV.W.0366.000000T0000Z-090719T1915Z/
LE FLORE OK-
150 PM CDT SUN JUL 19 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM CDT
FOR SOUTHEASTERN LE FLORE COUNTY...

AT 150 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL
AND WINDS TO 60 MPH. THIS STORM WAS LOCATED OVER SOUTHEASTERN LE
FLORE COUNTY...MOVING SOUTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3455 9470 3478 9456 3476 9444 3451 9445
      3450 9446 3450 9457
TIME...MOT...LOC 1850Z 298DEG 17KT 3466 9453

$$

000 
WWUS54 KTSA 191909
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
209 PM CDT SUN JUL 19 2009

OKC079-191919-
/O.EXP.KTSA.SV.W.0366.000000T0000Z-090719T1915Z/
LE FLORE OK-
209 PM CDT SUN JUL 19 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LE FLORE COUNTY
EXPIRES AT 215 PM CDT...

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

LAT...LON 3455 9470 3478 9456 3476 9444 3451 9445
      3450 9446 3450 9457
TIME...MOT...LOC 1909Z 298DEG 17KT 3462 9444

$$

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 Jul 19, 12:21 PM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Jul 19, 12:21 PM CDT, 1 hour 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1221 PM CDT SUN JUL 19 2009

...AVIATION...

.DISCUSSION...
VFR CONDITIONS ARE EXPECTED AT ALL TAF SITES THROUGH THE
PERIOD. THE ISOLATED SHOWERS AND THUNDERSTORMS THAT WERE
OCCURRING ACROSS PORTIONS OF SOUTHEAST OKLAHOMA AND WEST-CENTRAL
ARKANSAS HAVE EXITED THE AREA.

&&

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

AVIATION...10

Hazardous weather outlook, Jul 19, 12:40 PM CDT, 53 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
1240 PM CDT SUN JUL 19 2009

ARZ001-002-010-011-019-020-029-OKZ049-053>076-201000-
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-
1240 PM CDT SUN JUL 19 2009

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THUNDERSTORMS WITH DANGEROUS LIGHTNING.
RISK...LIMITED.
AREA...EXTREME SOUTHEAST OKLAHOMA.
ONSET...ONGOING.

DISCUSSION...
ISOLATED SHOWERS AND THUNDERSTORMS WILL CONTINUE TO BE POSSIBLE
THROUGH EARLY AFTERNOON ACROSS SOUTHEAST OKLAHOMA. OTHERWISE...
PARTLY CLOUDY SKIES CAN BE EXPECTED AS HIGH PRESSURE PREVAILS.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
SPOTTER ACTIVATION NOT EXPECTED.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.
MONDAY...SEVERE THUNDERSTORM POTENTIAL.
TUESDAY...THUNDERSTORM POTENTIAL...HEAVY RAIN POTENTIAL.
WEDNESDAY...THUNDERSTORM POTENTIAL.
THURSDAY...NO HAZARDS.
FRIDAY...NO HAZARDS.
SATURDAY...THUNDERSTORM POTENTIAL.

EXTENDED DISCUSSION...
THUNDERSTORMS ENTER THE FORECAST AGAIN MONDAY. THE BEST CHANCE
OF THUNDERSTORMS WILL BE MONDAY NIGHT INTO TUESDAY AS A COLD FRONT
APPROACHES FROM THE NORTHWEST. AN UPPER LEVEL SYSTEM WILL INTERACT
WITH THE COLD FRONT PRODUCING A LARGE AREA OF THUNDERSTORMS THAT
WILL LIKELY MOVE SOUTH AND SOUTHEAST INTO EASTERN OKLAHOMA AND
NORTHWEST ARKANSAS.  SEVERE THUNDERSTORMS WILL BE POSSIBLE ALONG
THE LEADING EDGE OF THE THUNDERSTORM COMPLEX. AFTER THAT...HEAVY RAIN
MAY BECOME AN ISSUE.  THE THUNDERSTORMS SHOULD START TO WIND DOWN
LATE TUESDAY AND TUESDAY NIGHT BUT THERE COULD BE SOME LINGERING RAIN
WEDNESDAY. THE NEXT CHANCE OF THUNDERSTORMS WILL BE SATURDAY AS A
COLD FRONT WILL MOVE SOUTHEAST INTO THE AREA.

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

In the hours before

Special weather statement, Jul 19, 1:28 PM CDT, 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
128 PM CDT SUN JUL 19 2009

OKZ076-191915-
LE FLORE OK-
128 PM CDT SUN JUL 19 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 215 PM CDT
FOR THE FOLLOWING COUNTY...

IN SOUTHEAST OKLAHOMA
     SOUTHEASTERN LE FLORE

AT 129 PM CDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 4 MILES
NORTH OF BIG CEDAR...MOVING EAST AT 25 MPH. SOME LOCATIONS THAT WILL
BE AFFECTED BY THIS STORM INCLUDE...BIG CEDAR.

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

LAT...LON 3459 9479 3484 9469 3477 9445 3462 9445
      3452 9446 3451 9447
TIME...MOT...LOC 1829Z 290DEG 20KT 3470 9462

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 1:28 PM CDT	Special Weather Statement	TSA	LeFlore	47 min
Jul 19, 5:30 PM CDT	Special Weather Statement	TSA	Pushmataha	45 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

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.