Alert archive / Louisiana / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 243

May 3, 199725 parishes in Louisiana; 5 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at May 3, 1997, 2:00 AM CDT for 25 parishes in Louisiana; 5 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 3, 1997, 2:00 AM CDT (07:00 UTC)
Expired
May 3, 1997, 8:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 30 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, Pearl River County, MS, Stone County, MS

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 3, 2:37 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge38 min
May 3, 2:55 AM CDTSevere Thunderstorm WarningLIXSaint Helena35 min
May 3, 3:00 AM CDTSevere Thunderstorm WarningLIXLivingston30 min
May 3, 3:10 AM CDTTornado WarningLIXLivingston, Saint Helena, Tangipahoa35 min
May 3, 3:44 AM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa31 min
May 3, 4:14 AM CDTSevere Thunderstorm WarningLIXSaint Tammany46 min
May 3, 4:50 AM CDTSevere Thunderstorm WarningLIXHancock40 min
May 3, 5:14 AM CDTSevere Thunderstorm WarningLIXHarrison61 min
May 3, 5:43 AM CDTSevere Thunderstorm WarningLIXHancock17 min

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.0 hours before the alert went out and 116 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 1997-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2040 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 1997-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 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
2040 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
786 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.9
Supercell composite
5.2

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
May 2, 10:15 PM CDTSevere Thunderstorm WatchSPCAllen, Beauregard, Bienville, Calcasieu, Caldwell, Cameron and 25 more6 hr
May 3, 12:00 AM CDTTornado WatchSPCAdams, Amite, Attala, Bolivar, Calhoun, Carroll and 56 more6 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.