Alert archive / Texas / Tornado Warnings in 2012

Tornado Warning 6, NWS Shreveport, LA

March 11, 2012Sabine County, Texas; Sabine Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Mar 11, 2012, 3:55 PM CDT for Sabine County, Texas; Sabine Parish, Louisiana. It was in force for 50 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: Mar 11, 2012, 3:55 PM CDT (20:55 UTC)
Expired: Mar 11, 2012, 4:45 PM CDT
In force: 50 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Sabine Parish, LA, Sabine County, TX

What was reported inside it

Time	Report	Where	Remark
Mar 11, 4:00 PM CDT	TSTM WND DMG	5 Sw Hemphill, TX	SHERIFFS OFFICE REPORTED A TREE DOWN.

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
Mar 11, 11:55 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.9 hours before the alert went out and 114 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 419 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 328 m²/s²
0-3 km storm-relative helicity: 390 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

579 
WFUS54 KSHV 112055
TORSHV
LAC085-TXC403-112145-
/O.NEW.KSHV.TO.W.0006.120311T2055Z-120311T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
355 PM CDT SUN MAR 11 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  SABINE COUNTY IN EASTERN TEXAS...
  CENTRAL SABINE PARISH IN NORTHWEST LOUISIANA...

* UNTIL 445 PM CDT

* AT 355 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO JUST SOUTHWEST OF 
  HEMPHILL...OR 22 MILES NORTHWEST OF TOLEDO BEND DAM...MOVING NORTHEAST 
  AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  COLUMBUS AND NEGREET.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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 3166 9373 3147 9346 3117 9391 3131 9404
TIME...MOT...LOC 2055Z 220DEG 28KT 3132 9390

$$

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 11, 8:38 AM CDT	River Flood Warning	SHV	Smith, Wood	6 days
Mar 11, 10:53 AM CDT	Areal Flood Warning	SHV	Cherokee, Smith	3 hr
Mar 11, 12:56 PM CDT	Areal Flood Warning	SHV	Angelina, Nacogdoches	3 hr
Mar 11, 1:12 PM CDT	Areal Flood Warning	SHV	Harrison, Panola, Rusk	3 hr
Mar 11, 2:12 PM CDT	Tornado Warning	SHV	Sabine, San Augustine, Shelby	48 min
Mar 11, 3:01 PM CDT	Severe Thunderstorm Warning	SHV	Sabine, Shelby	44 min
Mar 11, 4:56 PM CDT	Areal Flood Warning	SHV	Sabine, San Augustine	3 hr
Mar 11, 1:41 AM CST	River Flood Warning	SHV	Caldwell, Grant, LaSalle, Winn	20 days
Mar 11, 2:44 PM CDT	Areal Flood Advisory	SHV	Bossier, Caddo, De Soto, Red River	2 hr
Mar 11, 4:05 PM CDT	Tornado Warning	SHV	De Soto, Natchitoches, Red River	40 min
Mar 11, 4:38 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	49 min
Mar 11, 6:53 PM CDT	Areal Flood Advisory	SHV	Ouachita, Union	3 hr

Nearby

Tornado Warnings in Texas, 2012 Tornado Warnings in Louisiana, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.