Alert archive / Arkansas / Tornado Warnings in 2011

Tornado Warning 44, NWS Shreveport, LA

April 26, 2011Howard County, Arkansas

NWS Shreveport, LA issued this tornado warning at Apr 26, 2011, 7:29 PM CDT for Howard County, Arkansas. It was in force for 31 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, 7:29 PM CDT (00:29 UTC)
Expired: Apr 26, 2011, 8:00 PM CDT
In force: 31 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

County Howard County, AR

The radar

The Western Arkansas radar (KSRX), 113 km from the middle of the area, began a volume at 00:29 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 00:00Z, 0.5 hours before the alert went out and 205 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: 2270 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 961 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 281 m²/s²
0-3 km storm-relative helicity: 428 m²/s²
Significant tornado parameter: 5.6
Supercell composite: 23.5

Open this sounding in Storm Lab

The text

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

554 
WFUS54 KSHV 270029
TORSHV
ARC061-270100-
/O.NEW.KSHV.TO.W.0044.110427T0029Z-110427T0100Z/

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN HOWARD COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITY OF UMPIRE...

* UNTIL 800 PM CDT.

* AT 724 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 12 MILES WEST OF
  ATHENS...OR 13 MILES WEST OF UMPIRE...MOVING EAST AT 40 MPH.

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

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 9393 3435 9392 3428 9392 3427 9391
      3423 9391 3420 9425 3427 9425 3428 9426
      3435 9426 3436 9425
TIME...MOT...LOC 0029Z 255DEG 36KT 3432 9421

$$

12

1 follow-up statement

965 
WWUS54 KSHV 270052
SVSSHV

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

ARC061-270102-
/O.EXP.KSHV.TO.W.0044.000000T0000Z-110427T0100Z/
HOWARD AR-
752 PM CDT TUE APR 26 2011

...THE TORNADO WARNING FOR HOWARD COUNTY WILL EXPIRE AT 800 PM CDT...

THE STORM THAT PROMPTED THE WARNING HAS MOVED OUT OF HOWARD COUNTY.

LAT...LON 3436 9393 3435 9392 3428 9392 3427 9391
      3423 9391 3420 9425 3427 9425 3428 9426
      3435 9426 3436 9425
TIME...MOT...LOC 0052Z 255DEG 36KT 3438 9394

$$

12

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 8:32 PM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	43 min
Apr 26, 8:52 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Union	38 min
Apr 26, 9:16 PM CDT	Severe Thunderstorm Warning	SHV	Union	44 min
Apr 26, 9:30 PM CDT	Severe Thunderstorm Warning	SHV	Union	45 min
Apr 26, 9:53 PM CDT	Tornado Warning	SHV	Union	37 min
Apr 26, 10:14 PM CDT	Severe Thunderstorm Warning	SHV	Union	46 min
Apr 26, 10:51 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Union	54 min
Apr 26, 10:57 PM CDT	Tornado Warning	SHV	Union	45 min
Apr 26, 11:03 PM CDT	Severe Thunderstorm Warning	SHV	Little River	57 min
Apr 27, 4:41 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Hempstead, Lafayette, Nevada	64 min
Apr 27, 5:02 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Lafayette, Miller, Nevada	58 min
Apr 27, 5:15 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Lafayette, Miller	60 min
Apr 27, 5:44 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Lafayette, Miller	38 min
Apr 27, 5:50 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Hempstead, Lafayette, Nevada	55 min
Apr 27, 6:08 AM CDT	Flash Flood Warning	SHV	Columbia, Hempstead, Lafayette, Nevada	4 hr
Apr 27, 7:30 AM CDT	Lake Wind Advisory	SHV	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	12 hr
Apr 27, 10:37 AM CDT	River Flood Warning	SHV	Ashley, Union	4 days

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