Alert archive / Arkansas / Tornado Warnings in 2011

Tornado Warning 19, NWS Shreveport, LA

April 25, 2011Howard County, Sevier County, Arkansas; McCurtain County, Oklahoma

NWS Shreveport, LA issued this tornado warning at Apr 25, 2011, 2:10 PM CDT for Howard County, Sevier County, Arkansas; McCurtain County, Oklahoma. It was in force for 35 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 25, 2011, 2:10 PM CDT (19:10 UTC)
Expired: Apr 25, 2011, 2:45 PM CDT
In force: 35 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Howard County, AR, Sevier County, AR, McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 121 km from the middle of the area, began a volume at 19:10 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 25, 11:00 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.2 hours before the alert went out and 200 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: 1213 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 759 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 491 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 11.5

Open this sounding in Storm Lab

The text

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

077 
WFUS54 KSHV 251910
TORSHV
ARC061-133-OKC089-251945-
/O.NEW.KSHV.TO.W.0019.110425T1910Z-110425T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
210 PM CDT MON APR 25 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

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

* UNTIL 245 PM CDT

* AT 205 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR BROKEN
  BOW...OR 24 MILES WEST OF HORATIO...MOVING EAST AT 55 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 3436 9424 3404 9407 3388 9478 3406 9486
      3425 9447 3420 9446 3420 9425 3427 9425
      3428 9426 3434 9426
TIME...MOT...LOC 1910Z 250DEG 48KT 3401 9470

$$

12

2 follow-up statements

644 
WWUS54 KSHV 251931
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
231 PM CDT MON APR 25 2011

ARC061-133-OKC089-251945-
/O.CON.KSHV.TO.W.0019.000000T0000Z-110425T1945Z/
SEVIER AR-HOWARD AR-MCCURTAIN OK-
231 PM CDT MON APR 25 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM CDT FOR
MCCURTAIN...HOWARD AND SEVIER COUNTIES...

AT 226 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A POSSIBLE TORNADO.  THIS 
POSSIBLE TORNADO WAS LOCATED 10 MILES SOUTHWEST OF GILLHAM...OR 
7 MILES WEST OF DE QUEEN...MOVING EAST AT 55 MPH. REPORTS OF 
WIDESPREAD DAMAGE ACROSS THE CITY OF BROKEN BOW HAS BEEN REPORTED
WITH THIS STORM.

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 3436 9424 3412 9412 3404 9455 3417 9463
      3425 9447 3420 9446 3420 9425 3427 9425
      3428 9426 3434 9426
TIME...MOT...LOC 1930Z 250DEG 48KT 3410 9440

$$

12

850 
WWUS54 KSHV 251943
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
243 PM CDT MON APR 25 2011

ARC061-133-OKC089-251953-
/O.EXP.KSHV.TO.W.0019.000000T0000Z-110425T1945Z/
SEVIER AR-HOWARD AR-MCCURTAIN OK-
243 PM CDT MON APR 25 2011

...THE TORNADO WARNING FOR MCCURTAIN...HOWARD AND SEVIER COUNTIES
WILL EXPIRE AT 245 PM CDT...

LAT...LON 3436 9424 3412 9412 3404 9455 3417 9463
      3425 9447 3420 9446 3420 9425 3427 9425
      3428 9426 3434 9426
TIME...MOT...LOC 1943Z 250DEG 48KT 3416 9420

$$

12

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 10:17 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Sevier	58 min
Apr 25, 12:14 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Little River, Sevier	76 min
Apr 25, 12:41 AM CDT	Severe Thunderstorm Warning	SHV	Little River, Sevier	64 min
Apr 25, 1:24 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Nevada, Sevier	66 min
Apr 25, 3:48 AM CDT	Lake Wind Advisory	SHV	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	21 hr
Apr 25, 6:14 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Little River, Sevier	61 min
Apr 25, 7:11 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Sevier	64 min
Apr 25, 8:47 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Little River, Miller, Nevada	43 min
Apr 25, 9:05 AM CDT	Tornado Warning	SHV	Hempstead, Nevada	25 min
Apr 25, 9:26 AM CDT	Tornado Warning	SHV	Hempstead, Nevada	19 min
Apr 25, 1:22 PM CDT	Tornado Warning	SHV	Sevier	23 min
Apr 25, 2:53 PM CDT	Flash Flood Warning	SHV	Howard, Little River, Sevier	4 hr
Apr 25, 3:03 PM CDT	Tornado Warning	SHV	Howard, Little River, Sevier	27 min
Apr 25, 3:14 PM CDT	Severe Thunderstorm Warning	SHV	Little River, Sevier	46 min
Apr 25, 3:28 PM CDT	Tornado Warning	SHV	Howard, Sevier	32 min
Apr 25, 3:39 PM CDT	Severe Thunderstorm Warning	SHV	Little River, Sevier	51 min
Apr 25, 3:49 PM CDT	Flash Flood Watch	SHV	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	39 hr
Apr 25, 3:59 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Sevier	46 min
Apr 25, 4:02 PM CDT	Tornado Warning	SHV	Little River, Sevier	28 min
Apr 25, 4:27 PM CDT	Tornado Warning	SHV	Howard, Sevier	48 min
Apr 25, 5:14 PM CDT	Tornado Warning	SHV	Little River	31 min
Apr 25, 5:27 PM CDT	Tornado Warning	SHV	Little River, Sevier	33 min
Apr 25, 5:30 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Miller, Sevier	45 min
Apr 25, 6:06 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Nevada, Sevier	39 min
Apr 25, 6:15 PM CDT	Tornado Warning	SHV	Hempstead, Howard, Little River, Sevier	45 min
Apr 25, 6:43 PM CDT	Flash Flood Warning	SHV	Hempstead, Howard, Little River, Sevier	3 hr
Apr 25, 6:54 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Lafayette, Little River, Miller	51 min
Apr 25, 6:57 PM CDT	Severe Thunderstorm Warning	SHV	Miller	48 min
Apr 24, 9:35 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	55 min
Apr 24, 9:49 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	41 min
Apr 25, 5:19 AM CDT	Severe Thunderstorm Warning	SHV	McCurtain	56 min
Apr 25, 12:11 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	49 min
Apr 25, 12:29 PM CDT	Flash Flood Warning	SHV	McCurtain	4 hr
Apr 25, 12:59 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	61 min
Apr 25, 1:37 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	38 min
Apr 25, 1:48 PM CDT	Tornado Warning	SHV	McCurtain	27 min
Apr 25, 2:05 PM CDT	River Flood Warning	SHV	McCurtain	16 hr
Apr 25, 2:37 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	38 min
Apr 25, 4:31 PM CDT	Flash Flood Warning	SHV	McCurtain	4 hr
Apr 25, 6:02 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	43 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.