Alert archive / Louisiana / Tornado Warnings in 2012
Tornado Warning 9, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at Mar 20, 2012, 10:55 AM CDT for De Soto Parish, Sabine Parish, Louisiana. It was in force for 35 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, 10:55 AM CDT (15:55 UTC)
- Expired
- Mar 20, 2012, 11:30 AM CDT
- In force
- 35 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
Counties De Soto Parish, LA, Sabine Parish, LA
The radar
The Shreveport radar (KSHV), 64 km from the middle of the area, began a volume at 15:56 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.
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 20, 9:46 AM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 3.9 hours before the alert went out and 68 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
- 395 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 754 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 221 m²/s²
- 0-3 km storm-relative helicity
- 306 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.1
The text
As transmitted, in the capitals the NWS used until 2016.
365
WFUS54 KSHV 201555
TORSHV
LAC031-085-201630-
/O.NEW.KSHV.TO.W.0009.120320T1555Z-120320T1630Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1055 AM CDT TUE MAR 20 2012
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
* TORNADO WARNING FOR...
CENTRAL DE SOTO PARISH IN NORTHWEST LOUISIANA...
THIS INCLUDES THE CITY OF MANSFIELD...
EXTREME NORTHWESTERN SABINE PARISH IN NORTHWEST LOUISIANA...
* UNTIL 1130 AM CDT
* AT 1051 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 17 MILES
SOUTHWEST OF MANSFIELD...MOVING NORTHEAST AT 40 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH
MANSFIELD...GRAND CANE AND CARMEL.
LAT...LON 3178 9384 3180 9384 3182 9388 3187 9389
3211 9381 3207 9356 3176 9379
TIME...MOT...LOC 1555Z 205DEG 33KT 3185 9383
$$
243 follow-up statements
949
WWUS54 KSHV 201605
SVSSHV
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1105 AM CDT TUE MAR 20 2012
LAC085-201615-
/O.CAN.KSHV.TO.W.0009.000000T0000Z-120320T1630Z/
SABINE LA-
1105 AM CDT TUE MAR 20 2012
...THE TORNADO WARNING FOR SABINE PARISH IS CANCELLED...
LAT...LON 3185 9377 3186 9380 3186 9383 3190 9386
3209 9380 3207 9356 3186 9372
TIME...MOT...LOC 1605Z 205DEG 33KT 3193 9378
$$
LAC031-201630-
/O.CON.KSHV.TO.W.0009.000000T0000Z-120320T1630Z/
DE SOTO LA-
1105 AM CDT TUE MAR 20 2012
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT FOR DE SOTO
PARISH...
AT 1101 AM CDT...A TORNADO WAS REPORTED. THIS TORNADO WAS LOCATED 9
MILES SOUTHWEST OF SOUTH MANSFIELD...OR 11 MILES SOUTHWEST OF
MANSFIELD...MOVING NORTHEAST AT 40 MPH.
THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED PARISH.
LAT...LON 3185 9377 3186 9380 3186 9383 3190 9386
3209 9380 3207 9356 3186 9372
TIME...MOT...LOC 1605Z 205DEG 33KT 3193 9378
$$
24695
WWUS54 KSHV 201611
SVSSHV
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1111 AM CDT TUE MAR 20 2012
LAC031-201630-
/O.CON.KSHV.TO.W.0009.000000T0000Z-120320T1630Z/
DE SOTO LA-
1111 AM CDT TUE MAR 20 2012
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT FOR DE SOTO
PARISH...
AT 1107 AM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO. THIS TORNADO WAS
LOCATED 6 MILES SOUTHWEST OF SOUTH...SOUTHWEST OF MANSFIELD...MOVING
NORTHEAST AT 40 MPH.
THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED PARISH.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.
&&
LAT...LON 3191 9368 3191 9375 3192 9380 3195 9384
3209 9380 3207 9356
TIME...MOT...LOC 1612Z 205DEG 33KT 3199 9375
$$
24195 WWUS54 KSHV 201621 SVSSHV SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 1121 AM CDT TUE MAR 20 2012 LAC031-201630- /O.CON.KSHV.TO.W.0009.000000T0000Z-120320T1630Z/ DE SOTO LA- 1121 AM CDT TUE MAR 20 2012 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT FOR DE SOTO PARISH... AT 1116 AM CDT...A TORNADO WAS REPORTED. THIS TORNADO WAS LOCATED OVER DE SOTO PARISH...5 MILES NORTHEAST OF MANSFIELD...MOVING NORTHEAST AT 40 MPH. LAT...LON 3200 9363 3204 9372 3208 9370 3207 9356 TIME...MOT...LOC 1621Z 205DEG 33KT 3209 9365 $$ 24
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 19, 8:36 PM CDT | River Flood Warning | SHV | Caddo | 6 days |
| Mar 20, 11:06 AM CDT | River Flood Warning | SHV | Bossier, Webster | 32 days |
| Mar 20, 11:16 AM CDT | River Flood Warning | SHV | Bienville, Bossier, Webster | 12 days |
| Mar 20, 11:17 AM CDT | River Flood Warning | SHV | Lincoln, Ouachita, Union | 7 days |
| Mar 20, 11:31 AM CDT | Tornado Warning | SHV | De Soto, Natchitoches, Sabine | 29 min |
| Mar 20, 11:35 AM CDT | Severe Thunderstorm Warning | SHV | Natchitoches, Sabine | 55 min |
| Mar 20, 12:10 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, De Soto, Natchitoches, Red River, Sabine | 65 min |
| Mar 20, 12:30 PM CDT | Severe Thunderstorm Warning | SHV | Grant, Natchitoches, Sabine, Winn | 60 min |
| Mar 20, 12:54 PM CDT | Tornado Warning | SHV | Natchitoches, Winn | 36 min |
| Mar 20, 1:04 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Jackson, Lincoln, Natchitoches, Red River, Winn | 41 min |
| Mar 20, 1:34 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Grant, Jackson, Natchitoches, Winn | 56 min |
| Mar 20, 3:03 PM CDT | Flash Flood Warning | SHV | Grant, Natchitoches, Winn | 6 hr |
| Mar 20, 6:24 PM CDT | Flash Flood Warning | SHV | Natchitoches, Sabine | 3 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; radar from the NEXRAD Level II archive.