Alert archive / Arkansas / Tornado Warnings in 2011

Tornado Warning 11, NWS Shreveport, LA

April 14, 2011Sevier County, Arkansas; McCurtain County, Oklahoma

NWS Shreveport, LA issued this tornado warning at Apr 14, 2011, 11:37 PM CDT for Sevier County, Arkansas; McCurtain County, Oklahoma. It was in force for 38 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: Apr 14, 2011, 11:37 PM CDT (04:37 UTC)
Expired: Apr 15, 2011, 12:15 AM CDT
In force: 38 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Sevier County, AR, McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 126 km from the middle of the area, began a volume at 04:40 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
Apr 14, 11:37 PM CDT	TORNADO	4 Wsw Hochatown, OK	AN EF0 TORNADO TOUCHED DOWN WEST OF HOCHATOWN. THE STORM FIRST TOUCHED DOWN ALONG MEADOW LAKE DRIVE IN BEAVER BEND STATE PARK. SEVERAL TREES WERE UPROOTED. THE TORNADO THEN CROSSED COYOTE DRIVE AGAIN UPROOTING TREES. THE TORNADO FINALLY LIFTED ALONG THE SHOREL

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
Apr 14, 9:06 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 4.6 hours before the alert went out and 199 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: 1201 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1314 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.5

Open this sounding in Storm Lab

The text

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

906 
WFUS54 KSHV 150437
TORSHV
ARC133-OKC089-150515-
/O.NEW.KSHV.TO.W.0011.110415T0437Z-110415T0515Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1137 PM CDT THU APR 14 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL MCCURTAIN COUNTY IN SOUTHEAST OKLAHOMA...
  NORTHWESTERN SEVIER COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITY OF DE QUEEN...

* UNTIL 1215 AM CDT

* AT 1135 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING
  A TORNADO 9 MILES NORTHEAST OF BROKEN BOW...MOVING EAST AT 40 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  GILLHAM...

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.

&&

LAT...LON 3420 9446 3420 9426 3397 9426 3402 9475
      3426 9473 3429 9447
TIME...MOT...LOC 0436Z 269DEG 34KT 3413 9464

$$

06

1 follow-up statement

399 
WWUS54 KSHV 150458
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1158 PM CDT THU APR 14 2011

ARC133-OKC089-150515-
/O.CON.KSHV.TO.W.0011.000000T0000Z-110415T0515Z/
SEVIER AR-MCCURTAIN OK-
1158 PM CDT THU APR 14 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT FOR
MCCURTAIN AND SEVIER COUNTIES...

AT 1155 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE 
METEOROLOGISTS CONTINUED TO DETECT A SEVERE THUNDERSTORMS CAPABLE OF 
PRODUCING A TORNADO.  THIS STORM WAS LOCATED 4 MILES NORTHEAST OF 
EAGLETOWN...MOVING EAST AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GILLHAM

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3420 9456 3420 9446 3420 9426 3397 9426
      3400 9459
TIME...MOT...LOC 0456Z 269DEG 34KT 3411 9446

$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 12:18 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	57 min
Apr 15, 12:21 AM CDT	Tornado Warning	SHV	Howard, Sevier	39 min
Apr 15, 12:26 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Miller, Sevier	64 min
Apr 15, 12:30 AM CDT	Severe Thunderstorm Warning	SHV	Miller	60 min
Apr 15, 1:14 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Lafayette, Little River, Miller, Nevada	61 min
Apr 15, 2:07 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Lafayette, Miller	53 min
Apr 15, 2:46 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Union	59 min
Apr 14, 9:46 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	59 min
Apr 14, 10:30 PM CDT	Tornado Warning	SHV	McCurtain	31 min
Apr 14, 10:48 PM CDT	Tornado Warning	SHV	McCurtain	57 min
Apr 14, 11:34 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	56 min
Apr 15, 10:14 AM CDT	River Flood Warning	SHV	McCurtain	4 hr

Nearby

Tornado Warnings in Arkansas, 2011 Tornado Warnings in Oklahoma, 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.