Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 7, NWS Tulsa, OK

February 27, 2011Crawford County, Franklin County, Sebastian County, Arkansas; LeFlore County, Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Feb 27, 2011, 11:27 PM CST for Crawford County, Franklin County, Sebastian County, Arkansas; LeFlore County, Sequoyah County, Oklahoma. It was in force for 48 min. 1 report 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 27, 2011, 11:27 PM CST (05:27 UTC)
Expired: Feb 28, 2011, 12:15 AM CST
In force: 48 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Crawford County, AR, Franklin County, AR, Sebastian County, AR, LeFlore County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 22 km from the middle of the area, began a volume at 05:28 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 27, 11:46 PM CST	TSTM WND GST 70	Pocola, OK	ON HWY 540 CLOSE TO TRI-STATE

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 27, 10:04 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 5.5 hours before the alert went out and 174 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: 626 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1011 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 369 m²/s²
0-3 km storm-relative helicity: 472 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 7.4

Open this sounding in Storm Lab

The text

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

401 
WUUS54 KTSA 280527
SVRTSA
ARC033-047-131-OKC079-135-280615-
/O.NEW.KTSA.SV.W.0007.110228T0527Z-110228T0615Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1127 PM CST SUN FEB 27 2011

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA
  SOUTHERN CRAWFORD COUNTY IN NORTHWEST ARKANSAS
  NORTHEASTERN LE FLORE COUNTY IN SOUTHEAST OKLAHOMA
  CENTRAL FRANKLIN COUNTY IN WEST CENTRAL ARKANSAS
  NORTHERN SEBASTIAN COUNTY IN WEST CENTRAL ARKANSAS

* UNTIL 1215 AM CST

* AT 1125 PM CST...A SEVERE THUNDERSTORM WAS LOCATED 4 MILES WEST OF
  SPIRO...MOVING EAST AT 55 MPH.

  STORM HAZARDS INCLUDE...
  QUARTER SIZE HAIL...
  DAMAGING WIND GUSTS TO 70 MPH...

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...ALMA...
  ARKOMA...BARLING...BLOOMER...BONANZA...DYER...FORT SMITH...JENNY
  LIND...LAVACA...MOFFETT...MULBERRY...PANAMA...POCOLA...SPIRO AND
  VAN BUREN.

THIS INCLUDES INTERSTATE 40 IN ARKANSAS BETWEEN MILE MARKERS 7 AND
34.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. IF YOU ARE NEAR THE PATH
OF THIS STORM...BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS.
TAKE COVER ON THE LOWEST FLOOR IN AN INTERIOR ROOM AND STAY AWAY FROM
WINDOWS.

PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3535 9380 3515 9472 3532 9479 3559 9388
      3537 9379
TIME...MOT...LOC 0528Z 252DEG 46KT 3526 9464

$$

1 follow-up statement

638 
WWUS54 KTSA 280542 RRA
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1142 PM CST SUN FEB 27 2011

ARC033-047-131-OKC079-135-280615-
/O.CON.KTSA.SV.W.0007.000000T0000Z-110228T0615Z/
SEBASTIAN AR-CRAWFORD AR-FRANKLIN AR-SEQUOYAH OK-LE FLORE OK-
1142 PM CST SUN FEB 27 2011

...SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 1215 AM CST FOR
NORTHEASTERN LE FLORE...SOUTHEASTERN SEQUOYAH...CENTRAL FRANKLIN...
SOUTHERN CRAWFORD AND NORTHERN SEBASTIAN COUNTIES...

AT 1138 PM CST...A SEVERE THUNDERSTORM WAS LOCATED NEAR BRADEN...
MOVING EAST AT 55 MPH.

STORM HAZARDS INCLUDE...
QUARTER SIZE HAIL...
DAMAGING WIND GUSTS TO 70 MPH...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...MILL
CREEK...RYE HILL...FORT SMITH...JENNY LIND...VAN BUREN...BARLING...
CENTRAL CITY...SHIBLEY...KIBLER...LAVACA...BLOOMER...URSULA...DYER...
VESTA...MULBERRY...PLEASANT HILL...PETER PENDER...CECIL...CRAVENS...
LONELM...TONEY AND MEG.

THIS INCLUDES INTERSTATE 40 IN ARKANSAS BETWEEN MILE MARKERS 23 AND
34.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. IF YOU ARE NEAR THE PATH
OF THIS STORM...YOU SHOULD BE ALERT FOR RAPIDLY CHANGING WEATHER
CONDITIONS AND BE READY TO ACT QUICKLY.

PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3536 9379 3520 9450 3537 9457 3558 9388
      3537 9379
TIME...MOT...LOC 0542Z 252DEG 46KT 3531 9443

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 27, 10:39 PM CST	Severe Thunderstorm Warning	TSA	Washington	51 min
Feb 27, 10:48 PM CST	Severe Thunderstorm Warning	TSA	Crawford, Sebastian	42 min
Feb 27, 10:50 PM CST	Severe Thunderstorm Warning	TSA	Crawford, Franklin	40 min
Feb 27, 11:00 PM CST	Severe Thunderstorm Warning	TSA	Benton, Washington	30 min
Feb 27, 11:28 PM CST	Severe Thunderstorm Warning	TSA	Benton, Carroll, Madison, Washington	47 min
Feb 27, 11:37 PM CST	Areal Flood Advisory	TSA	Carroll, Madison, Washington	113 min
Feb 28, 12:10 AM CST	Severe Thunderstorm Warning	TSA	Crawford, Franklin, Madison	32 min
Feb 28, 12:23 AM CST	Special Weather Statement	TSA	Carroll	37 min
Feb 27, 6:07 PM CST	Tornado Warning	TSA	Osage	23 min
Feb 27, 6:23 PM CST	Tornado Warning	TSA	Osage	12 min
Feb 27, 8:03 PM CST	Special Weather Statement	TSA	Osage	42 min
Feb 27, 9:00 PM CST	Special Weather Statement	TSA	Nowata	30 min
Feb 27, 9:48 PM CST	Special Weather Statement	TSA	Haskell, Latimer, Pittsburg	27 min
Feb 27, 9:54 PM CST	Special Weather Statement	TSA	Muskogee	36 min
Feb 27, 9:56 PM CST	Special Weather Statement	TSA	Adair	34 min
Feb 27, 10:23 PM CST	Special Weather Statement	TSA	Cherokee	37 min
Feb 27, 10:26 PM CST	Special Weather Statement	TSA	Haskell	34 min
Feb 27, 10:35 PM CST	Special Weather Statement	TSA	Pushmataha	25 min
Feb 27, 10:47 PM CST	Severe Thunderstorm Warning	TSA	Adair, Cherokee	28 min
Feb 27, 10:53 PM CST	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	52 min
Feb 27, 11:38 PM CST	Severe Thunderstorm Warning	TSA	LeFlore, Pushmataha	52 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2011 Severe Thunderstorm Warnings in Oklahoma, 2011 Every severe thunderstorm warning in 2011

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.