Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 266, NWS New Orleans, LA

August 31, 1997Jefferson Parish, Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Aug 31, 1997, 5:25 PM CDT for Jefferson Parish, Saint Charles Parish, Louisiana. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 31, 1997, 5:25 PM CDT (22:25 UTC)
Expired
Aug 31, 1997, 6:30 PM CDT
In force
65 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Jefferson Parish, LA, Saint Charles Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.4 hours before the alert went out and 72 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 1997-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1784 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 1997-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.1939Sfc1 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
1784 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
1106 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
24 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 31, 3:03 PM CDTSevere Thunderstorm WarningLIXWashington57 min
Aug 31, 3:40 PM CDTSevere Thunderstorm WarningLIXEast Feliciana50 min
Aug 31, 4:26 PM CDTSevere Thunderstorm WarningLIXTangipahoa64 min
Aug 31, 4:29 PM CDTSevere Thunderstorm WarningLIXSaint Tammany61 min
Aug 31, 6:07 PM CDTSevere Thunderstorm WarningLIXAssumption38 min
Aug 31, 6:17 PM CDTSevere Thunderstorm WarningLIXTerrebonne28 min
Aug 31, 3:17 PM CDTSevere Thunderstorm WarningLIXHarrison58 min
Aug 31, 4:16 PM CDTSevere Thunderstorm WarningLIXJackson59 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1997Every severe thunderstorm warning 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.