Alert archive / Arkansas / Tornado Warnings in 2011

Tornado Warning 97, NWS Shreveport, LA

November 21, 2011Howard County, Sevier County, Arkansas

NWS Shreveport, LA issued this tornado warning at Nov 21, 2011, 9:16 PM CST for Howard County, Sevier County, Arkansas. It was in force for 44 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: Nov 21, 2011, 9:16 PM CST (03:16 UTC)
Expired: Nov 21, 2011, 10:00 PM CST
In force: 44 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Howard County, AR, Sevier County, AR

The radar

The Western Arkansas radar (KSRX), 151 km from the middle of the area, began a volume at 03:19 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
Nov 21, 9:17 PM CST	TORNADO	2 Sw Horatio, AR	AN EF0 TORNADO TOUCHED DOWN SW OF HORATIO...JUST WEST OF HWY 41...WHERE NUMEROUS TREES WERE SNAPPED. THE TONRADO CROSSED HWY 41...SNAPPING ADDITIONAL TREES AND RIPPING ROOFING SHINGLES OFF OF A HOME. THE TORNADO CONTINUED ENE...FINALLY LIFTING JUST EAST OF THE
Nov 21, 9:22 PM CST	TSTM WND GST 58	De Queen, AR	ASOS PK WND 09050/0322 ON TOP OF A REFLECTIVITY COMMA HEAD

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
Nov 21, 8:36 PM CST	Tornado Watch	SPC	5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 3.3 hours before the alert went out and 168 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: 485 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1180 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 246 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

120 
WFUS54 KSHV 220316
TORSHV
ARC061-133-220400-
/O.NEW.KSHV.TO.W.0097.111122T0316Z-111122T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
916 PM CST MON NOV 21 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL HOWARD COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITIES OF...NASHVILLE...MINERAL SPRINGS...
  DIERKS...
  CENTRAL SEVIER COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITIES OF...HORATIO...DE QUEEN...

* UNTIL 1000 PM CST

* AT 911 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR HORATIO...
  MOVING EAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LOCKESBURG...CENTER POINT AND CORINTH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE
STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO
DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...
MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM
WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

LAT...LON 3419 9382 3390 9383 3381 9424 3383 9428
      3382 9430 3388 9434 3388 9438 3388 9436
      3390 9439 3394 9439 3394 9442 3393 9442
      3393 9445 3401 9446 3419 9386
TIME...MOT...LOC 0316Z 255DEG 39KT 3393 9434

$$

06

1 follow-up statement

899 
WWUS54 KSHV 220357
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
957 PM CST MON NOV 21 2011

ARC133-220403-
/O.CAN.KSHV.TO.W.0097.000000T0000Z-111122T0400Z/
SEVIER AR-
957 PM CST MON NOV 21 2011

...THE TORNADO WARNING FOR SEVIER COUNTY IS CANCELLED...

LAT...LON 3418 9382 3391 9383 3391 9405 3400 9406
      3403 9408 3413 9407 3419 9386 3419 9382
TIME...MOT...LOC 0353Z 255DEG 40KT 3410 9394 3403 9391
          3399 9394 3395 9396

$$

ARC061-220400-
/O.CON.KSHV.TO.W.0097.000000T0000Z-111122T0400Z/
HOWARD AR-
957 PM CST MON NOV 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1000 PM CST FOR HOWARD
COUNTY...

AT 950 PM CST...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE 
METEOROLOGISTS CONTINUED TO DETECT A LINE OF THUNDERSTORMS CAPABLE 
OF PRODUCING A TORNADO.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM DIERKS TO CENTER POINT TO 7 MILES SOUTHWEST OF CENTER 
POINT...MOVING EAST AT 45 MPH. CIRCULATION ASSOCIATED WITH A 
POSSIBLE TORNADO WAS APPROACHING CENTER POINT ARKANSAS.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MUDDY
FORK AND CORINTH

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
QUARTER INCH SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

LAT...LON 3418 9382 3391 9383 3391 9405 3400 9406
      3403 9408 3413 9407 3419 9386 3419 9382
TIME...MOT...LOC 0353Z 255DEG 40KT 3410 9394 3403 9391
          3399 9394 3395 9396

$$

06

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 21, 8:28 PM CST	Severe Thunderstorm Warning	SHV	Little River, Sevier	62 min
Nov 21, 10:02 PM CST	Severe Thunderstorm Warning	SHV	Howard	13 min

Nearby

Tornado Warnings in Arkansas, 2011 Every tornado warning in 2011 Tornadoes 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.