Alert archive / Louisiana / Tornado Watches in 2012

Tornado Watch 16

January 25, 201247 parishes in Louisiana; 14 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Jan 25, 2012, 2:08 PM CST for 47 parishes in Louisiana; 14 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jan 25, 2012, 2:08 PM CST (20:08 UTC)
Expired
Jan 25, 2012, 9:00 PM CST
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 61 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Livingston Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Richland Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Tensas Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Issaquena County, MS, Jefferson County, MS, Lawrence County, MS, Lincoln County, MS, Sharkey County, MS, Simpson County, MS, Warren County, MS, Washington County, MS, Wilkinson County, MS

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
30%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jan 25, 2:28 PM CSTTornado WarningLCHRapides, Vernon32 min
Jan 25, 2:36 PM CSTSevere Thunderstorm WarningLCHAllen, Beauregard, Calcasieu, Cameron54 min
Jan 25, 2:56 PM CSTTornado WarningLCHRapides34 min
Jan 25, 3:15 PM CSTSevere Thunderstorm WarningSHVCaldwell, Grant, LaSalle, Winn60 min
Jan 25, 3:24 PM CSTTornado WarningLCHRapides36 min
Jan 25, 3:30 PM CSTSevere Thunderstorm WarningLCHAllen, Beauregard, Calcasieu, Cameron, Evangeline, Jefferson Davis and 2 more60 min
Jan 25, 3:55 PM CSTTornado WarningLCHAvoyelles, Rapides35 min
Jan 25, 4:11 PM CSTTornado WarningJANCatahoula, Concordia26 min
Jan 25, 4:36 PM CSTSevere Thunderstorm WarningLCHAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 7 more54 min
Jan 25, 4:41 PM CSTTornado WarningLCHAvoyelles34 min
Jan 25, 5:33 PM CSTSevere Thunderstorm WarningLCHAcadia, Allen, Calcasieu, Cameron, Evangeline, Jefferson Davis and 2 more57 min
Jan 25, 5:57 PM CSTTornado WarningLCHCameron12 min
Jan 25, 6:11 PM CSTTornado WarningJANLincoln49 min
Jan 25, 6:29 PM CSTSevere Thunderstorm WarningLCHAcadia, Allen, Avoyelles, Cameron, Evangeline, Jefferson Davis and 2 more61 min
Jan 25, 6:33 PM CSTSevere Thunderstorm WarningJANCopiah, Lawrence, Simpson42 min
Jan 25, 6:55 PM CSTSevere Thunderstorm WarningLCHLafayette35 min
Jan 25, 6:55 PM CSTTornado WarningJANCopiah, Simpson33 min
Jan 25, 7:19 PM CSTSevere Thunderstorm WarningLCHAvoyelles, Lafayette, Saint Landry, Saint Martin56 min
Jan 25, 7:36 PM CSTTornado WarningJANCopiah, Lawrence, Simpson37 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.1 hours before the alert went out and 98 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, Lake Charles Mun, LA at 12:00Z on 2012-01-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 28 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, Lake Charles Mun, LA at 12:00Z on 2012-01-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 241 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
28 J/kg
Mixed-layer CIN
-201 J/kg
Mixed-layer LCL
576 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
241 m²/s²
0-3 km storm-relative helicity
341 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

Open this sounding in Storm Lab

The text

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

517 
WWUS20 KWNS 252014
SEL6
SPC WW 252014
ARZ000-LAZ000-MSZ000-TXZ000-CWZ000-260300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 16
NWS STORM PREDICTION CENTER NORMAN OK
210 PM CST WED JAN 25 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       SOUTH-CENTRAL AND SOUTHEAST ARKANSAS
       LOUISIANA
       WEST-CENTRAL AND SOUTHWEST MISSISSIPPI
       FAR SOUTHEAST TEXAS
       COASTAL WATERS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 210 PM UNTIL
900 PM CST.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTHWEST OF
INTRACOASTAL CITY LOUISIANA TO 45 MILES NORTH NORTHEAST OF MONROE
LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 15. WATCH NUMBER 15 WILL NOT BE IN EFFECT AFTER 210
PM CST.

DISCUSSION...LONG-LIVED QLCS WITH EMBEDDED LEWP AND SUPERCELL
STRUCTURES IS EXPECTED TO CONTINUE EWD TOWARD THE MS RIVER THIS
AFTERNOON INTO TONIGHT.  18Z LCH SOUNDING AND CURRENT VAD DATA FROM
FT. POLK LA INDICATE A FAVORABLE SEVERE STORM ENVIRONMENT WITH
MLCAPE VALUES OF 1000-2000 J/KG...50 KT OF DEEP-LAYER SHEAR AND 0-1
KM SRH OF AROUND 300 M2/S2.  WHILE THE DOMINANT LINEAR CONVECTIVE
MODE WILL LIMIT A MORE ROBUST TORNADO THREAT...A FEW TORNADOES WILL
REMAIN POSSIBLE.  DAMAGING WINDS WILL BE THE PRIMARY HAZARD WITH
SOME SEVERE HAIL ALSO POSSIBLE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 22035.


...MEAD

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 25, 7:56 AM CSTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 24 more7 hr
Jan 25, 11:24 AM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 25 more2 hr
Jan 25, 1:41 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 13 more94 min
Jan 25, 4:49 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Avoyelles, Cameron, Catahoula and 24 more86 min

Nearby

Tornado Watches in Louisiana, 2012Tornado Watches in Mississippi, 2012Every tornado watch 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.