Alert archive / Louisiana / Tornado Watches in 1999

Tornado Watch 33

January 22, 199925 parishes in Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Jan 22, 1999, 3:00 PM CST for 25 parishes in Louisiana; 6 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jan 22, 1999, 3:00 PM CST (21:00 UTC)
Expired
Jan 22, 1999, 9:00 PM CST
In force
6 hr
Issued by
the Storm Prediction Center
All 31 counties

Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jan 22, 3:33 PM CSTSevere Thunderstorm WarningLIXIberville32 min
Jan 22, 3:51 PM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, West Baton Rouge49 min
Jan 22, 4:05 PM CSTSevere Thunderstorm WarningLIXEast Feliciana, Livingston, Saint Helena35 min
Jan 22, 4:40 PM CSTSevere Thunderstorm WarningLIXSaint Helena, Tangipahoa45 min
Jan 22, 5:09 PM CSTSevere Thunderstorm WarningLCHSt. Mary61 min
Jan 22, 5:33 PM CSTSevere Thunderstorm WarningLIXAscension, Assumption, Saint James42 min
Jan 22, 5:46 PM CSTSevere Thunderstorm WarningLIXLivingston34 min
Jan 22, 5:55 PM CSTSevere Thunderstorm WarningLIXLafourche, Terrebonne30 min
Jan 22, 6:07 PM CSTSevere Thunderstorm WarningLIXSaint James, Saint John the Baptist48 min
Jan 22, 6:26 PM CSTSevere Thunderstorm WarningLIXLafourche, Saint Charles44 min
Jan 22, 6:43 PM CSTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa47 min

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.0 hours before the alert went out and 117 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 1999-01-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1281 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 1999-01-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 386 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
1281 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
515 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
386 m²/s²
0-3 km storm-relative helicity
445 m²/s²
Significant tornado parameter
2.4
Supercell composite
12.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 21, 8:30 PM CSTTornado WatchSPCAvoyelles, Bienville, Bossier, Caddo, Caldwell, Catahoula and 26 more7 hr
Jan 22, 3:00 AM CSTTornado WatchSPCAllen, Avoyelles, Beauregard, Bienville, Bossier, Caddo and 29 more6 hr
Jan 22, 9:45 AM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 36 more6 hr
Jan 21, 9:00 PM CSTTornado WatchSPCBolivar, Coahoma, DeSoto, Humphreys, Leflore, Marshall and 7 more6 hr
Jan 22, 3:00 AM CSTTornado WatchSPCAlcorn, Benton, Bolivar, Calhoun, Carroll, Coahoma and 22 more6 hr
Jan 22, 9:00 AM CSTTornado WatchSPCAlcorn, Amite, Attala, Benton, Bolivar, Calhoun and 69 more6 hr
Jan 22, 12:45 PM CSTTornado WatchSPCTishomingo6 hr
Jan 22, 2:15 PM CSTTornado WatchSPCAdams, Amite, Attala, Carroll, Choctaw, Claiborne and 45 more6 hr

Nearby

Tornado Watches in Louisiana, 1999Tornado Watches in Mississippi, 1999Every tornado watch in 1999

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.