Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 49, NWS Jackson, MS

April 15, 2011Catahoula Parish, Franklin Parish, Louisiana

NWS Jackson, MS issued this tornado warning at Apr 15, 2011, 8:27 AM CDT for Catahoula Parish, Franklin Parish, Louisiana. It was in force for 16 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 15, 2011, 8:27 AM CDT (13:27 UTC)
Expired
Apr 15, 2011, 8:43 AM CDT
In force
16 min
Issued by
NWS Jackson, MS
Area
Storm-based polygon

Counties Catahoula Parish, LA, Franklin Parish, LA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 15, 2:19 AM CDTTornado WatchSPC8 hr
Apr 15, 7:32 AM CDTTornado WatchSPC7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 1.5 hours before the alert went out and 158 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 12:00Z on 2011-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1458 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 12:00Z on 2011-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 382 square meters per square second.1939587897Sfc1 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
1458 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
523 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
382 m²/s²
0-3 km storm-relative helicity
565 m²/s²
Significant tornado parameter
4.0
Supercell composite
14.6

Open this sounding in Storm Lab

The text

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

401 
WFUS54 KJAN 151327
TORJAN
LAC025-041-151415-
/O.NEW.KJAN.TO.W.0049.110415T1327Z-110415T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON MS
827 AM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN CATAHOULA PARISH IN NORTHEAST LOUISIANA...
  SOUTHERN FRANKLIN PARISH IN NORTHEAST LOUISIANA...

* UNTIL 915 AM CDT

* AT 827 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR AIMWELL
  MOVING NORTHEAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ROSEFIELD...SHERWOOD...ENTERPRISE...JIGGER AND WISNER

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT A TORNADO IS OCCURRING OR IMMINENT. YOU
SHOULD ACTIVATE YOUR TORNADO ACTION PLAN AND TAKE PROTECTIVE ACTION
NOW.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 PM CDT FRIDAY AFTERNOON
FOR NORTHEAST LOUISIANA AND MISSISSIPPI.

&&

LAT...LON 3194 9200 3194 9191 3198 9189 3200 9189
      3217 9151 3208 9149 3204 9151 3200 9149
      3198 9151 3192 9151 3190 9156 3183 9156
      3173 9201
TIME...MOT...LOC 1327Z 246DEG 33KT 3184 9202

$$

BK
1 follow-up statement
400 
WWUS54 KJAN 151343 RRA
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
843 AM CDT FRI APR 15 2011

LAC025-041-151354-
/O.CAN.KJAN.TO.W.0049.000000T0000Z-110415T1415Z/
CATAHOULA LA-FRANKLIN LA-
843 AM CDT FRI APR 15 2011

...THE TORNADO WARNING FOR SOUTHERN FRANKLIN AND NORTHERN CATAHOULA
PARISHES IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 PM CDT FRIDAY AFTERNOON
FOR NORTHEAST LOUISIANA AND MISSISSIPPI.

LAT...LON 3194 9200 3194 9191 3198 9189 3200 9189
      3217 9151 3208 9149 3204 9151 3200 9149
      3198 9151 3192 9151 3190 9156 3183 9156
      3173 9201
TIME...MOT...LOC 1344Z 246DEG 33KT 3190 9185

$$

BK

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 15, 3:31 AM CDTSpecial Weather StatementJANMorehouse, West Carroll69 min
Apr 15, 4:21 AM CDTSevere Thunderstorm WarningJANMorehouse, Richland, West Carroll54 min
Apr 15, 5:14 AM CDTSevere Thunderstorm WarningJANEast Carroll, Morehouse, Richland, West Carroll61 min
Apr 15, 6:11 AM CDTSevere Thunderstorm WarningJANEast Carroll, Morehouse, West Carroll34 min
Apr 15, 6:20 AM CDTTornado WarningJANEast Carroll25 min
Apr 15, 6:34 AM CDTSevere Thunderstorm WarningJANRichland41 min
Apr 15, 6:46 AM CDTSevere Thunderstorm WarningJANEast Carroll, Morehouse, West Carroll59 min
Apr 15, 7:06 AM CDTTornado WarningJANFranklin, Richland24 min
Apr 15, 7:42 AM CDTSevere Thunderstorm WarningJANEast Carroll, Madison, West Carroll63 min
Apr 15, 8:06 AM CDTSevere Thunderstorm WarningJANCatahoula, Franklin54 min
Apr 15, 9:08 AM CDTSevere Thunderstorm WarningJANFranklin, Madison, Tensas67 min
Apr 15, 9:32 AM CDTSevere Thunderstorm WarningJANCatahoula, Concordia58 min
Apr 15, 1:26 PM CDTSevere Thunderstorm WarningJANConcordia64 min
Apr 15, 2:17 PM CDTSevere Thunderstorm WarningJANConcordia58 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; the sounding from the Mesonet's radiosonde archive.