Alert archive / Louisiana / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 182

April 22, 199730 parishes in Louisiana; 14 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Apr 22, 1997, 2:30 PM CDT for 30 parishes in Louisiana; 14 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 22, 1997, 2:30 PM CDT (19:30 UTC)
Expired
Apr 22, 1997, 9:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
All 44 counties

Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans 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, Covington County, MS, Franklin County, MS, Jefferson 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

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

IssuedProductOfficeCountiesLasted
Apr 22, 3:51 PM CDTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana54 min
Apr 22, 4:01 PM CDTSevere Thunderstorm WarningJANJefferson Davis, Lawrence44 min
Apr 22, 4:18 PM CDTSevere Thunderstorm WarningJANCovington, Simpson27 min
Apr 22, 4:45 PM CDTSevere Thunderstorm WarningLIXEast Feliciana45 min
Apr 22, 5:04 PM CDTSevere Thunderstorm WarningJANLawrence41 min
Apr 22, 5:12 PM CDTSevere Thunderstorm WarningLIXAmite, Pike48 min
Apr 22, 5:23 PM CDTSevere Thunderstorm WarningLIXWalthall37 min
Apr 22, 5:24 PM CDTSevere Thunderstorm WarningJANJefferson Davis, Marion66 min
Apr 22, 5:45 PM CDTSevere Thunderstorm WarningJANLamar60 min
Apr 22, 6:27 PM CDTSevere Thunderstorm WarningJANMarion33 min
Apr 22, 6:33 PM CDTSevere Thunderstorm WarningLIXPearl River57 min
Apr 22, 6:44 PM CDTSevere Thunderstorm WarningJANLamar46 min
Apr 22, 7:44 PM CDTSevere Thunderstorm WarningLIXPearl River31 min

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.5 hours before the alert went out and 165 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 1997-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1720 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 1997-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 square meters per square second.19395878Sfc1 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
1720 J/kg
Mixed-layer CIN
-141 J/kg
Mixed-layer LCL
521 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
261 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.5

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
Apr 21, 10:00 PM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 17 more6 hr
Apr 22, 1:00 AM CDTTornado WatchSPCBienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 3 more5 hr
Apr 22, 5:00 AM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 7 more6 hr
Apr 22, 8:45 AM CDTTornado WatchSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, LaSalle and 6 more6 hr
Apr 22, 1:15 PM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 2 more6 hr
Apr 22, 11:15 AM CDTTornado WatchSPCAttala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 28 more6 hr
Apr 22, 1:30 PM CDTTornado WatchSPCClarke, Forrest, George, Greene, Hancock, Harrison and 11 more8 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 1997Severe Thunderstorm Watches in Mississippi, 1997Every severe thunderstorm watch in 1997

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.