Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 93, NWS Shreveport, LA

November 8, 2011Bienville Parish, Bossier Parish, Webster Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Nov 8, 2011, 6:00 PM CST for Bienville Parish, Bossier Parish, Webster Parish, Louisiana. It was in force for 45 min. 2 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: Nov 8, 2011, 6:00 PM CST (00:00 UTC)
Expired: Nov 8, 2011, 6:45 PM CST
In force: 45 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Bienville Parish, LA, Bossier Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 43 km from the middle of the area, began a volume at 00:03 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
Nov 8, 6:20 PM CST	TORNADO	5 S Sibley, LA	AN EF0 TORNADO TOUCHED DOWN ALONG HWY 7 AND SNAPPED A FEW TREES AS IT HEADED NE. THE TORNADO CROSSED MASON FELLS ROAD AND HWY 531 WHERE SEVERAL TREES WERE SNAPPED. THE TORNADO CONTINUED NE AND SNAPPED NUMEROUS TREES ON COUSSONS RD BEFORE LIFTING. MAXIMUM WINDS
Nov 8, 6:29 PM CST	TORNADO	3 Se Sibley, LA	AN EF0 TORNADO TOUCHED DOWN JUST W OF THE INTERSECTION OF COUSSONS RD AND HWY 531 AND MOVED NE...SNAPPING AND UPROOTING SEVERAL TREES. THE TORNADO CROSSED MAGNOLIA RD AND EVENTUALLY LIFTED ALONG HARVEYS BARBER SHOP RD...WHERE SEVERAL LARGE TREE LIMBS WERE BROK

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
Nov 8, 10:49 AM CST	Tornado Watch	SPC	7 hr
Nov 8, 5:30 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.0 hours before the alert went out and 254 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: 2040 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.4

Open this sounding in Storm Lab

The text

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

779 
WFUS54 KSHV 090000
TORSHV
LAC013-015-119-090045-
/O.NEW.KSHV.TO.W.0093.111109T0000Z-111109T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
600 PM CST TUE NOV 8 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN BIENVILLE PARISH IN NORTHWEST LOUISIANA...
  SOUTHEASTERN BOSSIER PARISH IN NORTHWEST LOUISIANA...
  SOUTHERN WEBSTER PARISH IN NORTHWEST LOUISIANA...
  THIS INCLUDES THE CITY OF MINDEN...

* UNTIL 645 PM CST

* AT 555 PM CST...TRAINED WEATHER SPOTTERS REPORTED A TORNADO 11
  MILES SOUTH OF DOYLINE...OR 15 MILES SOUTHEAST OF BOSSIER CITY...
  MOVING NORTHEAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  RINGGOLD...HEFLIN...SIBLEY AND DUBBERLY...

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 3224 9349 3226 9349 3228 9352 3230 9352
      3230 9354 3231 9353 3234 9357 3242 9361
      3266 9321 3261 9317 3259 9318 3258 9315
      3240 9301
TIME...MOT...LOC 2359Z 242DEG 28KT 3238 9344

$$

VII

1 follow-up statement

796 
WWUS54 KSHV 090025
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
625 PM CST TUE NOV 8 2011

LAC013-015-119-090045-
/O.CON.KSHV.TO.W.0093.000000T0000Z-111109T0045Z/
BOSSIER LA-BIENVILLE LA-WEBSTER LA-
625 PM CST TUE NOV 8 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CST FOR
WEBSTER...BIENVILLE AND BOSSIER PARISHES...

AT 620 PM CST...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED NEAR HEFLIN...OR 11 MILES SOUTH OF MINDEN...MOVING NORTHEAST 
AT 30 MPH. ADDITIONAL STRONG THUNDERSTORMS ARE ALSO MOVING BACK INTO
THE WARNED AREA.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
DUBBERLY...SAILES AND ADA

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.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL 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 3224 9349 3226 9349 3228 9352 3230 9352
      3230 9354 3231 9353 3234 9357 3242 9361
      3266 9321 3261 9317 3259 9318 3258 9315
      3240 9301
TIME...MOT...LOC 0024Z 242DEG 28KT 3247 9324

$$

VII

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 8, 6:06 PM CST	Severe Thunderstorm Warning	SHV	Claiborne, Union, Webster	39 min
Nov 8, 6:42 PM CST	Tornado Warning	SHV	Bienville, Claiborne, Lincoln, Webster	48 min
Nov 8, 7:26 PM CST	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Jackson, Lincoln, Ouachita, Union	64 min
Nov 8, 8:34 PM CST	Tornado Warning	SHV	Jackson, Ouachita	41 min
Nov 8, 8:37 PM CST	Tornado Warning	SHV	Grant, Natchitoches, Sabine	38 min
Nov 8, 9:31 PM CST	Areal Flood Advisory	SHV	Ouachita	119 min

Nearby

Tornado Warnings in Louisiana, 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.