Alert archive / Arkansas / Tornado Warnings in 2011

Tornado Warning 41, NWS Shreveport, LA

April 26, 2011Howard County, Arkansas; McCurtain County, Oklahoma

NWS Shreveport, LA issued this tornado warning at Apr 26, 2011, 6:58 PM CDT for Howard County, Arkansas; McCurtain County, Oklahoma. It was in force for 32 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: Apr 26, 2011, 6:58 PM CDT (23:58 UTC)
Expired: Apr 26, 2011, 7:30 PM CDT
In force: 32 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Howard County, AR, McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 116 km from the middle of the area, began a volume at 00:01 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
Apr 26, 1:44 PM CDT	Tornado Watch PDS	SPC	10 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 12.0 hours before the alert went out and 211 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: 1650 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 566 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 7.2

Open this sounding in Storm Lab

The text

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

271 
WFUS54 KSHV 262358
TORSHV
ARC061-OKC089-270030-
/O.NEW.KSHV.TO.W.0041.110426T2358Z-110427T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
658 PM CDT TUE APR 26 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

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

* UNTIL 730 PM CDT.

* AT 654 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 29 MILES WEST OF
  ATHENS...OR 20 MILES NORTHWEST OF DE QUEEN...MOVING EAST AT 40 MPH.

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

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 3430 9445 3430 9427 3436 9425 3436 9405
      3427 9402 3422 9425 3430 9427 3430 9445
      3419 9447 3416 9461 3433 9467 3439 9446
TIME...MOT...LOC 2358Z 255DEG 36KT 3427 9453

$$

12

1 follow-up statement

745 
WWUS54 KSHV 270017
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
717 PM CDT TUE APR 26 2011

OKC089-270027-
/O.CAN.KSHV.TO.W.0041.000000T0000Z-110427T0030Z/
MCCURTAIN OK-
717 PM CDT TUE APR 26 2011

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

LAT...LON 3436 9425 3436 9405 3427 9402 3422 9425
      3430 9427
TIME...MOT...LOC 0017Z 255DEG 36KT 3432 9431

$$

ARC061-270030-
/O.CON.KSHV.TO.W.0041.000000T0000Z-110427T0030Z/
HOWARD AR-
717 PM CDT TUE APR 26 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR HOWARD
COUNTY...

AT 713 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED 16 MILES WEST OF ATHENS...OR 18 MILES WEST OF UMPIRE...MOVING
EAST AT 40 MPH.

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

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 3436 9425 3436 9405 3427 9402 3422 9425
      3430 9427
TIME...MOT...LOC 0017Z 255DEG 36KT 3432 9431

$$

12

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 7:01 PM CDT	Tornado Warning	SHV	Hempstead, Lafayette, Miller	44 min
Apr 25, 7:11 PM CDT	Flash Flood Warning	SHV	Little River, Miller	3 hr
Apr 25, 7:19 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	41 min
Apr 25, 7:45 PM CDT	Severe Thunderstorm Warning	SHV	Miller	60 min
Apr 25, 7:49 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Hempstead, Lafayette, Miller, Nevada	56 min
Apr 25, 7:56 PM CDT	Tornado Warning	SHV	Columbia, Lafayette, Union	27 min
Apr 25, 8:45 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Lafayette, Miller	60 min
Apr 25, 8:49 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Lafayette, Union	56 min
Apr 25, 9:28 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Lafayette	62 min
Apr 25, 9:44 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Union	61 min
Apr 25, 10:48 PM CDT	Severe Thunderstorm Warning	SHV	Union	31 min
Apr 26, 1:07 AM CDT	Severe Thunderstorm Warning	SHV	Nevada	23 min
Apr 26, 6:10 AM CDT	River Flood Warning	SHV	Howard, Little River, Sevier	47 hr
Apr 26, 9:49 AM CDT	River Flood Warning	SHV	Columbia	7 days
Apr 26, 3:11 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Hempstead, Lafayette, Nevada	49 min
Apr 26, 6:40 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Lafayette, Miller, Nevada	50 min
Apr 26, 6:46 PM CDT	Tornado Warning	SHV	Nevada	14 min
Apr 26, 6:55 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	65 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.