Alert archive / Louisiana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 815

December 31, 200224 parishes in Louisiana; 12 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Dec 31, 2002, 12:00 AM CST for 24 parishes in Louisiana; 12 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Dec 31, 2002, 12:00 AM CST (06:00 UTC)
Expired
Dec 31, 2002, 5:00 AM CST
In force
5 hr
Issued by
the Storm Prediction Center
All 36 counties

Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Franklin County, MS, Jefferson Davis County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Dec 31, 12:37 AM CSTSevere Thunderstorm WarningLCHVermilion53 min
Dec 31, 12:45 AM CSTSevere Thunderstorm WarningLCHLafayette60 min
Dec 31, 12:47 AM CSTSevere Thunderstorm WarningLCHSaint Landry28 min
Dec 31, 12:54 AM CSTSevere Thunderstorm WarningLCHIberia, Saint Martin66 min
Dec 31, 1:04 AM CSTSevere Thunderstorm WarningLIXPointe Coupee56 min
Dec 31, 1:11 AM CSTSevere Thunderstorm WarningLCHSt. Mary64 min
Dec 31, 1:20 AM CSTSevere Thunderstorm WarningLIXIberville55 min
Dec 31, 1:36 AM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, West Baton Rouge54 min
Dec 31, 1:53 AM CSTSevere Thunderstorm WarningLIXAscension, Assumption, Saint James67 min
Dec 31, 1:55 AM CSTSevere Thunderstorm WarningLCHSaint Martin35 min
Dec 31, 1:58 AM CSTSevere Thunderstorm WarningLCHSaint Martin32 min
Dec 31, 1:58 AM CSTSevere Thunderstorm WarningLIXEast Feliciana, Saint Helena62 min
Dec 31, 2:03 AM CSTSevere Thunderstorm WarningLIXLivingston57 min
Dec 31, 2:18 AM CSTSevere Thunderstorm WarningLIXLafourche, Terrebonne57 min
Dec 31, 2:33 AM CSTSevere Thunderstorm WarningLIXSaint Charles, Saint John the Baptist, Tangipahoa57 min
Dec 31, 2:33 AM CSTSevere Thunderstorm WarningJANLincoln42 min
Dec 31, 3:01 AM CSTSevere Thunderstorm WarningLIXWashington59 min
Dec 31, 3:06 AM CSTSevere Thunderstorm WarningJANLawrence44 min
Dec 31, 3:12 AM CSTSevere Thunderstorm WarningLIXJefferson, Saint Tammany63 min
Dec 31, 3:36 AM CSTSevere Thunderstorm WarningJANMarion44 min
Dec 31, 4:08 AM CSTSevere Thunderstorm WarningJANLamar42 min
Dec 31, 4:09 AM CSTSevere Thunderstorm WarningJANLamar41 min

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.0 hours before the alert went out and 150 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 00:00Z on 2002-12-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 80 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 00:00Z on 2002-12-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
80 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
856 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
166 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 30, 8:55 PM CSTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 24 more5 hr
Dec 31, 2:50 AM CSTTornado WatchSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more5 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 2002Severe Thunderstorm Watches in Mississippi, 2002Every severe thunderstorm watch in 2002

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.