Alert archive / Oklahoma / Tornado Warnings in 2009

Tornado Warning 35, NWS Tulsa, OK

September 21, 2009LeFlore County, Oklahoma

NWS Tulsa, OK issued this tornado warning at Sep 21, 2009, 10:00 PM CDT for LeFlore County, Oklahoma. It was in force for 12 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: Sep 21, 2009, 10:00 PM CDT (03:00 UTC)
Expired: Sep 21, 2009, 10:12 PM CDT
In force: 12 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

County LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 84 km from the middle of the area, began a volume at 03:01 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 watch it was issued in

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

Issued	Product	Office	Lasted
Sep 21, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 3.0 hours before the alert went out and 244 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: 1866 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1199 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KTSA 220300
TORTSA
OKC079-220330-
/O.NEW.KTSA.TO.W.0035.090922T0300Z-090922T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
1000 PM CDT MON SEP 21 2009

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN LE FLORE COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 1030 PM CDT

* AT 1000 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  POTENTIALLY TORNADIC THUNDERSTORM WITH STRONG LOW LEVEL ROTATION 6
  MILES EAST OF OCTAVIA...MOVING NORTHEAST AT 15 MPH. THIS IS A
  DANGEROUS STORM...A TORNADO IS OCCURRING OR COULD FORM AT ANY TIME.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE NEAR THE PATH OF THIS STORM...TAKE COVER NOW IF NO
UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR MORE
SUBSTANTIAL SHELTER. AVOID WINDOWS

&&

LAT...LON 3456 9474 3474 9445 3451 9445 3450 9446
      3450 9470
TIME...MOT...LOC 0301Z 238DEG 14KT 3453 9459

$$

1 follow-up statement

000 
WWUS54 KTSA 220312
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1012 PM CDT MON SEP 21 2009

OKC079-220322-
/O.CAN.KTSA.TO.W.0035.000000T0000Z-090922T0330Z/
LE FLORE OK-
1012 PM CDT MON SEP 21 2009

...THE TORNADO WARNING FOR SOUTHEASTERN LE FLORE COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS MOVED OUT OF THE WARNED AREA AND WEAKENED BELOW
SEVERE LIMITS...THEREFORE THE TORNADO WARNING HAS BEEN CANCELLED.

LAT...LON 3456 9474 3474 9445 3451 9445 3450 9446
      3450 9470
TIME...MOT...LOC 0312Z 238DEG 14KT 3455 9454

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 21, 7:08 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa	23 min
Sep 21, 7:09 PM CDT	Severe Thunderstorm Warning	TSA	Creek	51 min
Sep 21, 7:20 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Okfuskee, Okmulgee, Pittsburg	40 min
Sep 21, 7:31 PM CDT	Areal Flood Warning	TSA	Craig, Mayes, Nowata, Rogers, Tulsa, Washington	4 hr
Sep 21, 7:54 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Sequoyah	66 min
Sep 21, 7:59 PM CDT	River Flood Warning	TSA	Ottawa	61 hr
Sep 21, 7:59 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, McIntosh, Muskogee, Pittsburg	61 min
Sep 21, 8:08 PM CDT	Flash Flood Warning	TSA	Sequoyah	6 hr
Sep 21, 8:29 PM CDT	Special Weather Statement	TSA	LeFlore	61 min
Sep 21, 9:10 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pittsburg, Pushmataha	61 min
Sep 21, 9:18 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	27 min
Sep 21, 9:28 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	32 min
Sep 21, 9:49 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Pushmataha	56 min

Nearby

Tornado Warnings in Oklahoma, 2009 Every tornado warning in 2009 Tornadoes 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.