Alert archive / Arkansas / Tornado Warnings in 2011

Tornado Warning 40, NWS Shreveport, LA

April 26, 2011Nevada County, Arkansas

NWS Shreveport, LA issued this tornado warning at Apr 26, 2011, 6:46 PM CDT for Nevada County, Arkansas. It was in force for 14 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, 6:46 PM CDT (23:46 UTC)
Expired: Apr 26, 2011, 7:00 PM CDT
In force: 14 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

County Nevada County, AR

The radar

The Little Rock radar (KLZK), 148 km from the middle of the area, began a volume at 23:50 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, 11.8 hours before the alert went out and 149 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.

551 
WFUS54 KSHV 262346
TORSHV
ARC099-270015-
/O.NEW.KSHV.TO.W.0040.110426T2346Z-110427T0015Z/

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NEVADA COUNTY IN SOUTHWEST ARKANSAS...

* UNTIL 715 PM CDT.

* AT 644 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR BLUFF
  CITY...OR 13 MILES SOUTHEAST OF PRESCOTT...MOVING NORTHEAST AT 50
  MPH.

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

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 3382 9318 3382 9313 3378 9309 3372 9309
      3371 9310 3361 9310 3356 9329 3367 9339
      3383 9318
TIME...MOT...LOC 2346Z 241DEG 42KT 3369 9318

$$

12

1 follow-up statement

216 
WWUS54 KSHV 270000
SVSSHV

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

ARC099-270010-
/O.CAN.KSHV.TO.W.0040.000000T0000Z-110427T0015Z/
NEVADA AR-
700 PM CDT TUE APR 26 2011

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

THE ROTATION HAS MOVED OUT OF NEVADA COUNTY.

LAT...LON 3382 9318 3382 9313 3378 9309 3372 9309
      3371 9310 3361 9310 3356 9329 3367 9339
      3383 9318
TIME...MOT...LOC 0000Z 241DEG 42KT 3377 9301

$$

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, 6:58 PM CDT	Tornado Warning	SHV	Howard	32 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.