Alert archive / Louisiana / Tornado Warnings in 2012
Tornado Warning 8, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at Mar 11, 2012, 7:31 PM CDT for Caldwell Parish, LaSalle Parish, Winn Parish, Louisiana. It was in force for 44 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
- Mar 11, 2012, 7:31 PM CDT (00:31 UTC)
- Expired
- Mar 11, 2012, 8:15 PM CDT
- In force
- 44 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
Counties Caldwell Parish, LA, LaSalle Parish, LA, Winn Parish, LA
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, 6:42 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Shreveport, LA (KBAD), launched 00:00Z, 0.5 hours before the alert went out and 171 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.
- Mixed-layer CAPE
- 129 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 778 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 266 m²/s²
- 0-3 km storm-relative helicity
- 303 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
288
WFUS54 KSHV 120031
TORSHV
LAC021-059-127-120115-
/O.NEW.KSHV.TO.W.0008.120312T0031Z-120312T0115Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
731 PM CDT SUN MAR 11 2012
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
* TORNADO WARNING FOR...
CALDWELL PARISH IN NORTH CENTRAL LOUISIANA...
THIS INCLUDES THE CITY OF COLUMBIA...
NORTHWESTERN LA SALLE PARISH IN NORTH CENTRAL LOUISIANA...
EAST CENTRAL WINN PARISH IN NORTH CENTRAL LOUISIANA...
* UNTIL 815 PM CDT
* AT 730 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO ABOUT 3 MILES SOUTHWEST
OF OLLA...OR 20 MILES EAST OF WINNFIELD...MOVING NORTHEAST AT 35 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CLARKS AND GRAYSON...
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 3207 9192 3203 9189 3199 9189 3177 9233
3191 9245 3225 9200 3220 9197 3218 9197
3217 9191 3212 9186 3209 9186
TIME...MOT...LOC 0030Z 230DEG 32KT 3190 9229
$$
151 follow-up statement
192
WWUS54 KSHV 120056
SVSSHV
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
756 PM CDT SUN MAR 11 2012
LAC127-120103-
/O.CAN.KSHV.TO.W.0008.000000T0000Z-120312T0115Z/
WINN LA-
756 PM CDT SUN MAR 11 2012
...THE TORNADO WARNING FOR WINN PARISH IS CANCELLED...
THE SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO HAS EXITED EXTREME
EASTERN WINN PARISH.
LAT...LON 3207 9192 3203 9189 3199 9189 3177 9233
3197 9231 3225 9200 3220 9197 3218 9197
3217 9191 3212 9186 3209 9186
TIME...MOT...LOC 0053Z 225DEG 33KT 3205 9213
$$
LAC021-059-120115-
/O.CON.KSHV.TO.W.0008.000000T0000Z-120312T0115Z/
LA SALLE LA-CALDWELL LA-
756 PM CDT SUN MAR 11 2012
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR CALDWELL
AND LA SALLE PARISHES...
AT 756 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO. THIS TORNADO WAS
LOCATED NEAR CLARKS...OR 8 MILES SOUTHWEST OF COLUMBIA...MOVING
NORTHEAST AT 40 MPH. ANOTHER THUNDERSTORM EXHIBITING ROTATION
WAS INDICATED NEAR URANIA...ALSO MOVING NORTHEAST AT 40 MPH.
THIS STORM WILL AFFECT THE OLLA COMMUNITY BY 8 PM.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GRAYSON
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 3207 9192 3203 9189 3199 9189 3177 9233
3197 9231 3225 9200 3220 9197 3218 9197
3217 9191 3212 9186 3209 9186
TIME...MOT...LOC 0053Z 225DEG 33KT 3205 9213
$$
15The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 6:56 AM CDT | River Flood Warning | SHV | Webster | 20 days |
Nearby
Tornado Warnings in Louisiana, 2012Every tornado warning in 2012Tornadoes 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; the sounding from the Mesonet's radiosonde archive.