Alert archive / Arkansas / Tornado Warnings in 2011

Tornado Warning 54, NWS Shreveport, LA

April 26, 2011Union County, Arkansas

NWS Shreveport, LA issued this tornado warning at Apr 26, 2011, 9:53 PM CDT for Union County, Arkansas. It was in force for 37 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 26, 2011, 9:53 PM CDT (02:53 UTC)
Expired
Apr 26, 2011, 10:30 PM CDT
In force
37 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon

County Union County, AR

The radar

The Shreveport radar (KSHV), 160 km from the middle of the area, began a volume at 02:55 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

TimeReportWhereRemark
Apr 26, 9:53 PM CDTTSTM WND DMG5 Se El Dorado, ARNUMEROUS TREES DOWN ACROSS HIGHWAY 82 SOUTHEAST OF EL DORADO. POSSIBLE TORNADO.

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.

IssuedProductOfficeLasted
Apr 26, 1:44 PM CDTTornado Watch PDSSPC10 hr
Apr 26, 9:33 PM CDTTornado Watch PDSSPC7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 2.9 hours before the alert went out and 151 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-pSkew-T log-p diagram, Shreveport, LA at 00:00Z on 2011-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2270 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 2011-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 281 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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.

007 
WFUS54 KSHV 270253
TORSHV
ARC139-270330-
/O.NEW.KSHV.TO.W.0054.110427T0253Z-110427T0330Z/

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN UNION COUNTY IN SOUTH CENTRAL ARKANSAS...

* UNTIL 1030 PM CDT.

* AT 950 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES
  SOUTHWEST OF URBANA...OR 9 MILES SOUTHEAST OF EL DORADO...MOVING
  NORTHEAST AT 50 MPH.

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

LAT...LON 3303 9253 3313 9266 3334 9249 3333 9245
      3330 9245 3328 9239 3330 9233 3327 9230
      3329 9228 3326 9221 3324 9222
TIME...MOT...LOC 0253Z 221DEG 42KT 3314 9254

$$

12
1 follow-up statement
500 
WWUS54 KSHV 270328
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1028 PM CDT TUE APR 26 2011

ARC139-270337-
/O.EXP.KSHV.TO.W.0054.000000T0000Z-110427T0330Z/
UNION AR-
1028 PM CDT TUE APR 26 2011

...THE TORNADO WARNING FOR UNION COUNTY WILL EXPIRE AT 1030 PM CDT...

THE ASSOCIATED SEVERE THUNDERSTORM WITH THIS WARNING DECREASED AS IT 
MOVED INTO ARKANSAS AND THE WARNING WILL EXPIRE. 

LAT...LON 3303 9253 3313 9266 3334 9249 3333 9245
      3330 9245 3328 9239 3330 9233 3327 9230
      3329 9228 3326 9221 3324 9222
TIME...MOT...LOC 0327Z 221DEG 42KT 3344 9223

$$

06

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 7:29 PM CDTTornado WarningSHVHoward31 min
Apr 26, 8:32 PM CDTSevere Thunderstorm WarningSHVHoward, Sevier43 min
Apr 26, 8:52 PM CDTSevere Thunderstorm WarningSHVColumbia, Union38 min
Apr 26, 9:16 PM CDTSevere Thunderstorm WarningSHVUnion44 min
Apr 26, 9:30 PM CDTSevere Thunderstorm WarningSHVUnion45 min
Apr 26, 10:14 PM CDTSevere Thunderstorm WarningSHVUnion46 min
Apr 26, 10:51 PM CDTSevere Thunderstorm WarningSHVColumbia, Union54 min
Apr 26, 10:57 PM CDTTornado WarningSHVUnion45 min
Apr 26, 11:03 PM CDTSevere Thunderstorm WarningSHVLittle River57 min
Apr 27, 4:41 AM CDTSevere Thunderstorm WarningSHVColumbia, Hempstead, Lafayette, Nevada64 min
Apr 27, 5:02 AM CDTSevere Thunderstorm WarningSHVHempstead, Lafayette, Miller, Nevada58 min
Apr 27, 5:15 AM CDTSevere Thunderstorm WarningSHVHempstead, Lafayette, Miller60 min
Apr 27, 5:44 AM CDTSevere Thunderstorm WarningSHVColumbia, Lafayette, Miller38 min
Apr 27, 5:50 AM CDTSevere Thunderstorm WarningSHVColumbia, Hempstead, Lafayette, Nevada55 min
Apr 27, 6:08 AM CDTFlash Flood WarningSHVColumbia, Hempstead, Lafayette, Nevada4 hr
Apr 27, 7:30 AM CDTLake Wind AdvisorySHVColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more12 hr
Apr 27, 10:37 AM CDTRiver Flood WarningSHVAshley, Union4 days

Nearby

Tornado Warnings in Arkansas, 2011Every tornado warning in 2011Tornadoes 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.