Alert archive / Arkansas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 21, NWS Tulsa, OK

February 26, 2009Sebastian County, Arkansas; LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Feb 26, 2009, 6:38 PM CST for Sebastian County, Arkansas; LeFlore County, Oklahoma. It was in force for 52 min. 2 reports 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: Feb 26, 2009, 6:38 PM CST (00:38 UTC)
Expired: Feb 26, 2009, 7:30 PM CST
In force: 52 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Sebastian County, AR, LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 28 km from the middle of the area, began a volume at 00:38 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
Feb 26, 7:25 PM CST	TSTM WND GST 60	Cameron, OK
Feb 26, 7:25 PM CST	NON-TSTM WND GST 60	Cameron, OK

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Feb 26, 6:12 PM CST	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 0.6 hours before the alert went out and 212 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: 935 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1189 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 6.6

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 270038
SVRTSA
ARC131-OKC079-270130-
/O.NEW.KTSA.SV.W.0021.090227T0038Z-090227T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
638 PM CST THU FEB 26 2009

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN LE FLORE COUNTY IN SOUTHEAST OKLAHOMA
  SOUTHERN SEBASTIAN COUNTY IN WEST CENTRAL ARKANSAS

* UNTIL 730 PM CST

* AT 637 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL AND WINDS
  TO 60 MPH. THIS STORM WAS LOCATED NEAR POTEAU...MOVING EAST AT 25
  MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...PANAMA...
  HOWE...POTEAU...CAMERON...HARTFORD...MIDLAND...MANSFIELD...WASHBURN
  AND HUNTINGTON.

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

LAT...LON 3514 9413 3510 9415 3507 9423 3496 9422
      3496 9423 3495 9431 3495 9437 3492 9444
      3488 9445 3495 9491 3518 9490 3517 9402
      3514 9402
TIME...MOT...LOC 0038Z 268DEG 21KT 3505 9471

$$

1 follow-up statement

000 
WWUS54 KTSA 270101
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
701 PM CST THU FEB 26 2009

ARC131-OKC079-270130-
/O.CON.KTSA.SV.W.0021.000000T0000Z-090227T0130Z/
SEBASTIAN AR-LE FLORE OK-
701 PM CST THU FEB 26 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CST
FOR NORTHERN LE FLORE AND SOUTHERN SEBASTIAN COUNTIES...

AT 700 PM CST...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 NEAR CAMERON...MOVING
EAST AT 29 MPH.

SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...HARTFORD...
PATTERSON...MIDLAND...ARKOLA...MANSFIELD...WASHBURN...WITCHERVILLE...
DAYTON...HUNTINGTON...MILLTOWN...CROSSROADS AND LIBERTY.

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

LAT...LON 3514 9413 3510 9415 3507 9423 3496 9422
      3496 9423 3495 9431 3495 9437 3492 9444
      3488 9445 3492 9468 3518 9490 3517 9402
      3514 9402
TIME...MOT...LOC 0102Z 259DEG 25KT 3509 9453

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 26, 6:33 PM CST	Severe Thunderstorm Warning	TSA	Crawford, Washington	42 min
Feb 26, 6:35 PM CST	Severe Thunderstorm Warning	TSA	Sebastian	40 min
Feb 26, 6:41 PM CST	Severe Thunderstorm Warning	TSA	Carroll, Madison, Washington	64 min
Feb 26, 7:14 PM CST	Severe Thunderstorm Warning	TSA	Crawford, Franklin, Sebastian	61 min
Feb 26, 7:14 PM CST	Severe Thunderstorm Warning	TSA	Crawford, Franklin	46 min
Feb 26, 8:17 PM CST	Severe Thunderstorm Warning	TSA	Sebastian	28 min
Feb 26, 6:09 PM CST	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Sequoyah	66 min
Feb 26, 7:08 PM CST	Special Weather Statement	TSA	LeFlore	37 min
Feb 26, 7:34 PM CST	Special Weather Statement	TSA	Latimer	26 min
Feb 26, 7:42 PM CST	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pushmataha	63 min
Feb 26, 8:06 PM CST	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	54 min
Feb 26, 8:48 PM CST	Special Weather Statement	TSA	LeFlore	27 min
Feb 26, 8:57 PM CST	Severe Thunderstorm Warning	TSA	Choctaw	26 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2009 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.