Alert archive / Mississippi / Tornado Watches in 2013

Tornado Watch 34

February 10, 201310 parishes in Louisiana; 20 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Feb 10, 2013, 5:34 PM CST for 10 parishes in Louisiana; 20 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Feb 10, 2013, 5:34 PM CST (23:34 UTC)
Expired
Feb 10, 2013, 11:00 PM CST
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 30 counties

East Baton Rouge Parish, LA, East Feliciana Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hancock County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Walthall 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
20%
Ten or more severe wind reports
30%
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
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Feb 10, 5:36 PM CSTTornado WarningJANCovington, Jefferson Davis, Lamar, Marion54 min
Feb 10, 5:54 PM CSTFlash Flood WarningJANCovington, Jefferson Davis, Jones3 hr
Feb 10, 6:11 PM CSTTornado WarningJANJones64 min
Feb 10, 6:59 PM CSTFlash Flood WarningJANForrest, Lamar3 hr
Feb 10, 9:11 PM CSTSevere Thunderstorm WarningJANForrest, Lamar, Marion49 min
Feb 10, 9:55 PM CSTFlash Flood WarningJANForrest, Lamar, Marion4 hr
Feb 10, 10:40 PM CSTSevere Thunderstorm WarningJANLamar, Marion50 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.6 hours before the alert went out and 121 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, Slidell Radar S, LA at 12:00Z on 2013-02-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 66 joules per kilogram.LCLLFCEL10008507005003002001001 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, Slidell Radar S, LA at 12:00Z on 2013-02-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 526 square meters per square second.1939587897117Sfc1 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
66 J/kg
Mixed-layer CIN
-189 J/kg
Mixed-layer LCL
522 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
526 m²/s²
0-3 km storm-relative helicity
760 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.2

Open this sounding in Storm Lab

The text

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

471 
WWUS20 KWNS 102333
SEL4  
SPC WW 102333
LAZ000-MSZ000-110500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 34
NWS STORM PREDICTION CENTER NORMAN OK
535 PM CST SUN FEB 10 2013

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

       PARTS OF SOUTHEAST LOUISIANA
       SOUTHERN MISSISSIPPI

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 535 PM UNTIL
1100 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 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES EAST SOUTHEAST OF
BATON ROUGE LOUISIANA TO 55 MILES NORTH NORTHWEST OF PINE BELT
MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 32. WATCH NUMBER 32 WILL NOT BE IN EFFECT AFTER 535
PM CST. CONTINUE...WW 33...

DISCUSSION...UNTIL A STRONG SOUTHERLY LOW-LEVEL JET WEAKENS AND
DEVELOPS EAST OF THE REGION LATER THIS EVENING...THE RISK FOR
SUPERCELLS CAPABLE OF PRODUCING TORNADOES CONTINUES ACROSS THE
REGION.

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
500. MEAN STORM MOTION VECTOR 24040.


...KERR/THOMPSON

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 10, 4:18 AM CSTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 3 more5 hr
Feb 10, 5:12 AM CSTMesoscale DiscussionSPCSabine93 min
Feb 10, 6:20 AM CSTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 18 more85 min
Feb 10, 6:58 AM CSTTornado WatchSPCAllen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 24 more7 hr
Feb 10, 10:19 AM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Caldwell, Catahoula and 19 more86 min
Feb 10, 10:53 AM CSTMesoscale DiscussionSPCAvoyelles, Concordia, Evangeline, Pointe Coupee, Saint Landry, West Feliciana97 min
Feb 10, 11:10 AM CSTTornado WatchSPCAvoyelles, Catahoula, Concordia, East Baton Rouge, East Feliciana, Evangeline and 12 more7 hr
Feb 10, 1:59 PM CSTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 5 more91 min
Feb 10, 3:47 PM CSTMesoscale DiscussionSPCSaint Helena, Washington88 min
Feb 10, 5:03 PM CSTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Evangeline, Livingston, Pointe Coupee, Saint Helena and 6 more27 min
Feb 10, 2:39 PM CSTMesoscale DiscussionSPCGeorge, Greene, Wayne66 min
Feb 10, 3:14 PM CSTTornado WatchSPCGeorge, Greene, Harrison, Jackson, Perry, Stone and 1 more8 hr

Nearby

Tornado Watches in Mississippi, 2013Tornado Watches in Louisiana, 2013Every tornado watch in 2013

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.