Alert archive / Arkansas / Tornado Warnings in 2011

Tornado Warning 7, NWS Shreveport, LA

April 4, 2011Columbia County, Union County, Arkansas

NWS Shreveport, LA issued this tornado warning at Apr 4, 2011, 9:30 AM CDT for Columbia County, Union County, Arkansas. It was in force for 45 min. 3 reports 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 4, 2011, 9:30 AM CDT (14:30 UTC)
Expired: Apr 4, 2011, 10:15 AM CDT
In force: 45 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Columbia County, AR, Union County, AR

The radar

The Shreveport radar (KSHV), 137 km from the middle of the area, began a volume at 14:32 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

Time	Report	Where	Remark
Apr 4, 9:36 AM CDT	TSTM WND DMG	Magnolia, AR	DAMAGE TO MOBILE HOME AND ALSO RESIDENCE ALONG WITH NUMEROUS TREES AND POWER LINES DOWN AT 600 BLOCK OF CR 148 NEAR MAGNOLIA. ROADWAY BLOCKED DUE TO TREES.
Apr 4, 10:12 AM CDT	TSTM WND DMG	Norphlet, AR	TREES DOWN ON HOMES AND ALONG HIGHWAY 335...POWERLINES DOWN AS WELL. A SHED WAS BLOWN OVER IN THE AREA...
Apr 4, 10:12 AM CDT	TORNADO	Sw Norphlet, AR	AN EF1 TORNADO TOUCHED DOWN NEAR NORPHLET. AN OLD GAS STATION COVER WAS BLOWN DOWN AND SEVERAL TREES WERE SNAPPED ALONG BLACK STREET EASTWARD ACROSS HAYES STREET. SOME MINOR ROOF DAMAGE OCCURRED TO HOMES ALONG HAYES STREET. THE TORNADO CONTINUED EAST CROSSING

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.

Issued	Product	Office	Lasted
Apr 4, 3:44 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 4, 7:44 AM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 2.5 hours before the alert went out and 129 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: 1653 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 738 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 8.2

Open this sounding in Storm Lab

The text

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

931 
WFUS54 KSHV 041430
TORSHV
ARC027-139-041515-
/O.NEW.KSHV.TO.W.0007.110404T1430Z-110404T1515Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
930 AM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN UNION COUNTY IN SOUTH CENTRAL ARKANSAS...
  THIS INCLUDES THE CITIES OF...SMACKOVER...NORPHLET...EL DORADO...
  NORTHERN COLUMBIA COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITIES OF...WALDO...MCNEIL...MAGNOLIA...

* UNTIL 1015 AM CDT

* AT 928 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR WALDO...
  MOVING EAST AT 65 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  VILLAGE...MOUNT HOLLY...LISBON...WESSON...CALION...LAWSON AND
  URBANA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
QUARTER SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

&&

LAT...LON 3310 9242 3315 9346 3341 9337 3346 9319
      3346 9311 3339 9310 3338 9279 3340 9274
      3337 9265 3338 9256 3337 9253 3333 9251
      3334 9248
TIME...MOT...LOC 1429Z 265DEG 57KT 3332 9328

$$

04

1 follow-up statement

362 
WWUS54 KSHV 041457
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
957 AM CDT MON APR 4 2011

ARC027-041506-
/O.CAN.KSHV.TO.W.0007.000000T0000Z-110404T1515Z/
COLUMBIA AR-
957 AM CDT MON APR 4 2011

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

LAT...LON 3310 9242 3314 9297 3336 9295 3338 9279
      3340 9274 3337 9265 3338 9256 3337 9253
      3333 9251 3334 9248
TIME...MOT...LOC 1456Z 267DEG 55KT 3324 9288

$$

ARC139-041515-
/O.CON.KSHV.TO.W.0007.000000T0000Z-110404T1515Z/
UNION AR-
957 AM CDT MON APR 4 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 AM CDT FOR UNION
COUNTY...

AT 953 AM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE 
METEOROLOGISTS CONTINUED TO DETECT A POSSIBLE TORNADO.  THIS STORM 
WAS LOCATED NEAR CAIRO...OR 15 MILES SOUTHEAST OF STEPHENS...MOVING 
EAST AT 65 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LISBON...NEWELL...SMACKOVER...KENOVA...EL DORADO...NORPHLET...
URBANA...LAWSON...HILLSBORO AND CALION

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING
QUARTER SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

&&

LAT...LON 3310 9242 3314 9297 3336 9295 3338 9279
      3340 9274 3337 9265 3338 9256 3337 9253
      3333 9251 3334 9248
TIME...MOT...LOC 1456Z 267DEG 55KT 3324 9288

$$

04

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 6:00 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Little River, Sevier	28 min
Apr 4, 7:34 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Sevier	41 min
Apr 4, 7:56 AM CDT	Severe Thunderstorm Warning	SHV	Miller	64 min
Apr 4, 8:19 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Miller, Sevier	56 min
Apr 4, 8:29 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Hempstead, Lafayette, Miller	61 min
Apr 4, 8:42 AM CDT	Tornado Warning	SHV	Columbia, Hempstead, Lafayette, Miller, Nevada	48 min
Apr 4, 9:44 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Union	46 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.