Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 31, NWS Shreveport, LA

April 25, 2011Cass County, Marion County, Morris County, Texas

NWS Shreveport, LA issued this tornado warning at Apr 25, 2011, 7:58 PM CDT for Cass County, Marion County, Morris County, Texas. It was in force for 39 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, 7:58 PM CDT (00:58 UTC)
Expired: Apr 25, 2011, 8:37 PM CDT
In force: 39 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Cass County, TX, Marion County, TX, Morris County, TX

The radar

The Shreveport radar (KSHV), 73 km from the middle of the area, began a volume at 01:01 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, 3:22 PM CDT	Tornado Watch PDS	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 1.0 hours before the alert went out and 76 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: 782 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 1445 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 262 m²/s²
0-3 km storm-relative helicity: 553 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 15.0

Open this sounding in Storm Lab

The text

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

199 
WFUS54 KSHV 260058
TORSHV
TXC067-315-343-260145-
/O.NEW.KSHV.TO.W.0031.110426T0058Z-110426T0145Z/

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN CASS COUNTY IN NORTHEAST TEXAS...
  THIS INCLUDES THE CITY OF ATLANTA...
  NORTHERN MARION COUNTY IN NORTHEAST TEXAS...
  SOUTHEASTERN MORRIS COUNTY IN NORTHEAST TEXAS...

* UNTIL 845 PM CDT

* AT 756 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 13 MILES
  NORTHWEST OF BEREA...OR 22 MILES EAST OF PITTSBURG...MOVING EAST AT
  45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LINDEN...LODI...KILDARE...SMITHLAND...BIVINS...MCLEOD AND QUEEN
  CITY...

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.

&&

LAT...LON 3319 9404 3281 9406 3279 9464 3296 9471
TIME...MOT...LOC 0058Z 251DEG 40KT 3290 9457

$$

ELEVEN

1 follow-up statement

724 
WWUS54 KSHV 260137
SVSSHV

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

TXC067-315-343-260147-
/O.CAN.KSHV.TO.W.0031.000000T0000Z-110426T0145Z/
MORRIS TX-CASS TX-MARION TX-
837 PM CDT MON APR 25 2011

...THE TORNADO WARNING FOR MARION...CASS AND MORRIS COUNTIES IS
CANCELLED...

LAT...LON 3319 9404 3281 9406 3279 9464 3296 9471
TIME...MOT...LOC 0137Z 251DEG 40KT 3301 9407

$$

ELEVEN

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	Bowie	44 min
Apr 25, 7:11 PM CDT	Flash Flood Warning	SHV	Bowie, Camp, Cass, Franklin, Morris, Red River and 1 more	3 hr
Apr 25, 7:45 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Harrison, Marion, Morris and 1 more	60 min
Apr 25, 7:56 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Smith	64 min
Apr 25, 8:06 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Marion, Upshur	54 min
Apr 25, 8:45 PM CDT	Severe Thunderstorm Warning	SHV	Cass, Gregg, Harrison, Marion	60 min
Apr 25, 8:57 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Rusk	48 min
Apr 25, 9:25 PM CDT	Tornado Warning	SHV	Angelina, Cherokee, Nacogdoches	50 min
Apr 25, 10:03 PM CDT	Tornado Warning	SHV	Angelina, Nacogdoches	42 min
Apr 25, 10:11 PM CDT	Tornado Warning	SHV	Angelina, Nacogdoches	49 min
Apr 25, 10:45 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Sabine, San Augustine	45 min
Apr 25, 10:48 PM CDT	Tornado Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	27 min
Apr 26, 4:03 AM CDT	Lake Wind Advisory	SHV	Angelina, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 8 more	27 hr
Apr 26, 9:42 AM CDT	River Flood Warning	SHV	Franklin, Morris, Red River, Titus	67 hr
Apr 26, 9:42 AM CDT	River Flood Warning	SHV	Bowie, Cass, Morris	15 days
Apr 26, 9:43 AM CDT	River Flood Warning	SHV	Franklin, Morris, Titus	47 hr
Apr 26, 4:36 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee	54 min
Apr 26, 5:17 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Rusk	58 min
Apr 26, 5:29 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee	61 min
Apr 26, 5:50 PM CDT	Tornado Warning	SHV	Smith	40 min
Apr 26, 6:11 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Rusk	64 min
Apr 26, 6:24 PM CDT	Tornado Warning	SHV	Smith, Upshur, Wood	51 min
Apr 26, 6:34 PM CDT	Tornado Warning	SHV	Gregg, Harrison, Panola, Rusk	41 min
Apr 26, 6:55 PM CDT	Severe Thunderstorm Warning	SHV	Red River	65 min

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; radar from the NEXRAD Level II archive.