Alert archive / Louisiana / Tornado Warnings in 2012
Tornado Warning 14, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at Mar 20, 2012, 10:20 PM CDT for Grant Parish, Natchitoches Parish, Louisiana. It was in force for 40 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 20, 2012, 10:20 PM CDT (03:20 UTC)
- Expired
- Mar 20, 2012, 11:00 PM CDT
- In force
- 40 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
Counties Grant Parish, LA, Natchitoches Parish, LA
The nearest sounding before it
Jackson, MS (KJAN), launched 00:00Z, 3.3 hours before the alert went out and 287 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
- 267 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1256 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
742
WFUS54 KSHV 210320
TORSHV
LAC043-069-210400-
/O.NEW.KSHV.TO.W.0014.120321T0320Z-120321T0400Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1020 PM CDT TUE MAR 20 2012
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
* TORNADO WARNING FOR...
WEST CENTRAL GRANT PARISH IN NORTH CENTRAL LOUISIANA...
SOUTHEASTERN NATCHITOCHES PARISH IN NORTHWEST LOUISIANA...
* UNTIL 1100 PM CDT
* AT 1020 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 21 MILES
SOUTHWEST OF MONTGOMERY...OR 14 MILES NORTH OF SLAGLE...MOVING
NORTHEAST AT 40 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
GORUM...BELLWOOD...CHOPIN...CLOUTIERVILLE...MELROSE...NATCHEZ...
BERMUDA AND ALOHA.
LAT...LON 3136 9319 3176 9304 3174 9297 3171 9297
3171 9288 3164 9268 3135 9302
TIME...MOT...LOC 0320Z 207DEG 33KT 3142 9307
$$
133 follow-up statements
572
WWUS54 KSHV 210333
SVSSHV
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1033 PM CDT TUE MAR 20 2012
LAC043-069-210400-
/O.CON.KSHV.TO.W.0014.000000T0000Z-120321T0400Z/
NATCHITOCHES LA-GRANT LA-
1033 PM CDT TUE MAR 20 2012
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT FOR GRANT
AND NATCHITOCHES PARISHES...
AT 1031 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A POSSIBLE TORNADO LOCATED NEAR BELLWOOD...OR 19 MILES
NORTH OF SLAGLE...MOVING NORTHEAST AT 40 MPH. THIS STORM IS MOVING
TOWARDS MELROSE AND CLOUTIERVILLE. IF YOU LIVE IN THESE
COMMUNITIES...TAKE COVER IMMEDIATELY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST
DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
&&
LAT...LON 3146 9315 3176 9304 3174 9297 3171 9297
3171 9288 3164 9268 3140 9297
TIME...MOT...LOC 0331Z 207DEG 33KT 3151 9302
$$
13058
WWUS54 KSHV 210343
SVSSHV
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1043 PM CDT TUE MAR 20 2012
LAC043-069-210400-
/O.CON.KSHV.TO.W.0014.000000T0000Z-120321T0400Z/
NATCHITOCHES LA-GRANT LA-
1043 PM CDT TUE MAR 20 2012
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT FOR GRANT
AND NATCHITOCHES PARISHES...
AT 1042 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A STORM CAPABLE OF PRODUCING A TORNADO AT ANY TIME. THIS
STORM WAS LOCATED NEAR MELROSE...OR 14 MILES SOUTHEAST OF
NATCHITOCHES...MOVING NORTHEAST AT 40 MPH. IF YOU LIVE IN MELROSE OR
MONTGOMERY...TAKE COVER IMMEDIATELY.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
NATCHEZ...BERMUDA...ALOHA AND MONTGOMERY
PRECAUTIONARY/PREPAREDNESS ACTIONS...
&&
LAT...LON 3146 9315 3176 9304 3174 9297 3171 9297
3171 9288 3164 9268 3140 9297
TIME...MOT...LOC 0342Z 207DEG 33KT 3160 9296
$$
13056
WWUS54 KSHV 210349
SVSSHV
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1049 PM CDT TUE MAR 20 2012
LAC043-069-210400-
/O.CON.KSHV.TO.W.0014.000000T0000Z-120321T0400Z/
NATCHITOCHES LA-GRANT LA-
1049 PM CDT TUE MAR 20 2012
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT FOR GRANT
AND NATCHITOCHES PARISHES...
AT 1048 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE STRONG ROTATION
WITH A THUNDERSTORM THAT COULD PRODUCE A TORNADO AT ANY TIME. THIS
STORM WAS LOCATED JUST NORTH OF MELROSE TO BETWEEN MELROSE AND
MONTGOMERY...MOVING NORTHEAST AT 40 MPH. IF YOU LIVE IN MONTGOMERY...
TAKE COVER IMMEDIATELY.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
MONTGOMERY
LAT...LON 3158 9308 3176 9304 3174 9297 3171 9297
3171 9288 3166 9278 3154 9294
TIME...MOT...LOC 0348Z 207DEG 33KT 3167 9294
$$
13The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 8:55 PM CDT | Flash Flood Warning | SHV | Grant, Natchitoches, Sabine, Winn | 10 hr |
| Mar 20, 9:02 PM CDT | River Flood Warning | SHV | Bienville, Bossier, Red River, Webster | 11 days |
| Mar 20, 9:03 PM CDT | Tornado Warning | SHV | Natchitoches | 27 min |
| Mar 20, 9:15 PM CDT | Flash Flood Warning | SHV | Bienville, De Soto, Red River | 9 hr |
| Mar 20, 9:24 PM CDT | Tornado Warning | SHV | Natchitoches | 36 min |
| Mar 20, 10:50 PM CDT | Flash Flood Warning | SHV | Bossier, Claiborne, Webster | 10 hr |
| Mar 21, 1:52 AM CDT | Flash Flood Warning | SHV | Bienville, Jackson, Lincoln, Union | 8 hr |
| Mar 21, 2:49 AM CDT | Tornado Warning | SHV | Grant, Winn | 26 min |
| Mar 21, 3:14 AM CDT | Tornado Warning | SHV | Jackson, Winn | 46 min |
| Mar 21, 5:41 AM CDT | Tornado Warning | SHV | Jackson, Winn | 34 min |
| Mar 21, 6:16 AM CDT | Flash Flood Warning | SHV | Bienville, Red River | 3 hr |
| Mar 21, 6:47 AM CDT | Flash Flood Warning | SHV | Grant, Natchitoches, Red River, Sabine, Winn | 4 hr |
| Mar 21, 8:44 AM CDT | Flash Flood Warning | SHV | Claiborne | 2 hr |
| Mar 21, 9:36 AM CDT | Flash Flood Warning | SHV | Union | 114 min |
| Mar 21, 10:51 AM CDT | Flash Flood Warning | SHV | Grant, Natchitoches, Winn | 3 hr |
| Mar 21, 1:53 PM CDT | Areal Flood Warning | SHV | Natchitoches | 6 hr |
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.