Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 62, NWS Shreveport, LA

April 27, 2011Angelina County, San Augustine County, Texas

NWS Shreveport, LA issued this tornado warning at Apr 27, 2011, 1:28 AM CDT for Angelina County, San Augustine County, Texas. It was in force for 32 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 27, 2011, 1:28 AM CDT (06:28 UTC)
Expired: Apr 27, 2011, 2:00 AM CDT
In force: 32 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Angelina County, TX, San Augustine County, TX

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, 9:42 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 6.5 hours before the alert went out and 154 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: 2959 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 523 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 10.0

Open this sounding in Storm Lab

The text

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

463 
WFUS54 KSHV 270628
TORSHV
TXC005-405-270700-
/O.NEW.KSHV.TO.W.0062.110427T0628Z-110427T0700Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
128 AM CDT WED APR 27 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN ANGELINA COUNTY IN EASTERN TEXAS...
  SOUTHERN SAN AUGUSTINE COUNTY IN EASTERN TEXAS...

* UNTIL 200 AM CDT

* AT 126 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES WEST     
  OF DOLAN...MOVING EAST AT 50 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE
STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO
DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...
MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM
WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY 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 3105 9453 3106 9458 3107 9461 3118 9461
      3125 9406 3116 9405 3114 9405 3114 9404
      3111 9404 3103 9448
TIME...MOT...LOC 0628Z 272DEG 43KT 3110 9450

$$

06

1 follow-up statement

729 
WWUS54 KSHV 270653
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
153 AM CDT WED APR 27 2011

TXC005-405-270700-
/O.CON.KSHV.TO.W.0062.000000T0000Z-110427T0700Z/
SAN AUGUSTINE TX-ANGELINA TX-
153 AM CDT WED APR 27 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 AM CDT FOR ANGELINA
AND SAN AUGUSTINE COUNTIES...

AT 145 AM CDT...WEATHER SERVICE METEOROLOGISTS CONTINUED TO DETECT A
SEVERE THUNDERSTORM WITH STRONG ROTATION.  THIS TORNADO WAS LOCATED 
OVER ANGELINA COUNTY...OR 12 MILES SOUTHEAST OF ZAVALLA...MOVING EAST 
AT 50 MPH. THIS STORM WILL BE MOVING INTO THE SOUTHERN SECTIONS OF
SAN AUGUSTINE COUNTY CROSSING THE LAKE.

THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3121 9436 3125 9406 3116 9405 3114 9405
      3114 9404 3111 9404 3105 9434
TIME...MOT...LOC 0651Z 270DEG 44KT 3112 9418

$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 7:10 PM CDT	Tornado Warning	SHV	Harrison, Marion	50 min
Apr 26, 7:13 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Wood	47 min
Apr 26, 7:18 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Rusk, Shelby	57 min
Apr 26, 7:41 PM CDT	Tornado Warning	SHV	Panola	49 min
Apr 26, 7:47 PM CDT	Tornado Warning	SHV	Gregg, Rusk, Smith, Upshur	43 min
Apr 26, 8:28 PM CDT	Tornado Warning	SHV	Gregg, Harrison, Smith	35 min
Apr 26, 8:49 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Rusk, Smith	41 min
Apr 26, 9:21 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Marion, Panola, Rusk	54 min
Apr 26, 9:41 PM CDT	Severe Thunderstorm Warning	SHV	Harrison	49 min
Apr 26, 9:56 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola	49 min
Apr 26, 11:03 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River, Titus	57 min
Apr 26, 11:20 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches, Sabine, San Augustine	55 min
Apr 26, 11:34 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, San Augustine, Shelby	56 min
Apr 27, 12:23 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine, Shelby	67 min
Apr 27, 1:33 AM CDT	Severe Thunderstorm Warning	SHV	Sabine	42 min
Apr 27, 2:00 AM CDT	Tornado Warning	SHV	Sabine, San Augustine	47 min
Apr 27, 4:46 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Morris, Titus	59 min
Apr 27, 5:15 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass	60 min
Apr 27, 7:30 AM CDT	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	12 hr

Nearby

Tornado Warnings in Texas, 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.