Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 94, NWS Shreveport, LA

November 8, 20114 parishes in Louisiana

NWS Shreveport, LA issued this tornado warning at Nov 8, 2011, 6:42 PM CST for 4 parishes in Louisiana. It was in force for 48 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
Nov 8, 2011, 6:42 PM CST (00:42 UTC)
Expired
Nov 8, 2011, 7:30 PM CST
In force
48 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon

Counties Bienville Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 89 km from the middle of the area, began a volume at 00:41 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

TimeReportWhereRemark
Nov 8, 6:49 PM CSTTSTM WND DMG2 Nw Gibsland, LATREE DEBRIS NOTED ALONG INTERSTATE 20...BETWEEN MILE MARKERS 56 AND 57.

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.

IssuedProductOfficeLasted
Nov 8, 5:30 PM CSTTornado WatchSPC7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 0.7 hours before the alert went out and 270 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-pSkew-T log-p diagram, Jackson, MS at 00:00Z on 2011-11-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 107 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2011-11-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
107 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1030 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

458 
WFUS54 KSHV 090042
TORSHV
LAC013-027-061-119-090130-
/O.NEW.KSHV.TO.W.0094.111109T0042Z-111109T0130Z/

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN LINCOLN PARISH IN NORTH CENTRAL LOUISIANA...
  NORTH CENTRAL BIENVILLE PARISH IN NORTHWEST LOUISIANA...
  SOUTHERN CLAIBORNE PARISH IN NORTHWEST LOUISIANA...
  EAST CENTRAL WEBSTER PARISH IN NORTHWEST LOUISIANA...
  THIS INCLUDES THE CITY OF MINDEN...

* UNTIL 730 PM CST

* AT 637 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES WEST OF
  GIBSLAND...OR 8 MILES SOUTHEAST OF MINDEN...MOVING NORTHEAST AT 35
  MPH.

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

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 3284 9282 3262 9254 3244 9316 3263 9330
TIME...MOT...LOC 0041Z 243DEG 29KT 3257 9313

$$

VII
1 follow-up statement
802 
WWUS54 KSHV 090114
SVSSHV

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

LAC119-090123-
/O.CAN.KSHV.TO.W.0094.000000T0000Z-111109T0130Z/
WEBSTER LA-
714 PM CST TUE NOV 8 2011

...THE TORNADO WARNING FOR WEBSTER PARISH IS CANCELLED...

LAT...LON 3272 9309 3284 9282 3262 9254 3247 9306
TIME...MOT...LOC 0113Z 241DEG 47KT 3265 9288

$$

LAC013-027-061-090130-
/O.CON.KSHV.TO.W.0094.000000T0000Z-111109T0130Z/
LINCOLN LA-CLAIBORNE LA-BIENVILLE LA-
714 PM CST TUE NOV 8 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CST FOR
BIENVILLE...CLAIBORNE AND LINCOLN PARISHES...

AT 711 PM CST...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE 
METEOROLOGISTS CONTINUED TO DETECT A SEVERE THUNDERSTORM...WITH A 
HISTORY OF PRODUCING TORNADOES.  THIS STORM WAS LOCATED NEAR 
AYCOCK...OR 14 MILES SOUTHEAST OF HOMER...MOVING NORTHEAST AT 40 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LISBON...CORINTH...MOUNT ZION...VIENNA...DUBACH AND UNIONVILLE

LAT...LON 3272 9309 3284 9282 3262 9254 3247 9306
TIME...MOT...LOC 0113Z 241DEG 47KT 3265 9288

$$

VII

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 8, 6:00 PM CSTTornado WarningSHVBienville, Bossier, Webster45 min
Nov 8, 6:06 PM CSTSevere Thunderstorm WarningSHVClaiborne, Union, Webster39 min
Nov 8, 7:26 PM CSTSevere Thunderstorm WarningSHVBienville, Claiborne, Jackson, Lincoln, Ouachita, Union64 min
Nov 8, 8:34 PM CSTTornado WarningSHVJackson, Ouachita41 min
Nov 8, 8:37 PM CSTTornado WarningSHVGrant, Natchitoches, Sabine38 min
Nov 8, 9:31 PM CSTAreal Flood AdvisorySHVOuachita119 min

Nearby

Tornado Warnings in Louisiana, 2011Every tornado warning in 2011Tornadoes 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.