Alert archive / Louisiana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 127, NWS New Orleans, LA

November 25, 2020Jefferson Parish, Orleans Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Nov 25, 2020, 3:58 PM CST for Jefferson Parish, Orleans Parish, Louisiana. It was in force for 32 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
Nov 25, 2020, 3:58 PM CST (21:58 UTC)
Expired
Nov 25, 2020, 4:30 PM CST
In force
32 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Jefferson Parish, LA, Orleans Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.0 hours before the alert went out and 308 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, Lake Charles Mun, LA at 12:00Z on 2020-11-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1101 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, Lake Charles Mun, LA at 12:00Z on 2020-11-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 343 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
1101 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
560 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
343 m²/s²
0-3 km storm-relative helicity
342 m²/s²
Significant tornado parameter
2.3
Supercell composite
9.9

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 25, 3:18 AM CSTSmall Craft AdvisoryLIX3 hr
Nov 25, 7:46 AM CSTSpecial Weather StatementLIXEast Feliciana, Pointe Coupee, West Feliciana59 min
Nov 25, 8:58 AM CSTSpecial Weather StatementLIXEast Feliciana62 min
Nov 25, 9:23 AM CSTSpecial Weather StatementLIXEast Baton Rouge, Pointe Coupee37 min
Nov 25, 9:36 AM CSTSpecial Weather StatementLIXSaint Helena39 min
Nov 25, 10:16 AM CSTSpecial Weather StatementLIXSaint Helena44 min
Nov 25, 10:58 AM CSTSpecial Weather StatementLIXSaint Helena47 min
Nov 25, 11:00 AM CSTSpecial Weather StatementLIXEast Baton Rouge30 min
Nov 25, 11:40 AM CSTSpecial Weather StatementLIXTangipahoa35 min
Nov 25, 11:41 AM CSTSpecial Weather StatementLIXLivingston19 min
Nov 25, 11:50 AM CSTSpecial Weather StatementLIXTangipahoa25 min
Nov 25, 12:00 PM CSTSpecial Weather StatementLIXTangipahoa30 min
Nov 25, 12:09 PM CSTSevere Thunderstorm WarningLIXWashington21 min
Nov 25, 12:27 PM CSTSevere Thunderstorm WarningLIXWashington9 min
Nov 25, 12:39 PM CSTSpecial Weather StatementLIXWashington36 min
Nov 25, 12:40 PM CSTSpecial Weather StatementLIXWashington35 min
Nov 25, 12:45 PM CSTSpecial Weather StatementLIXLivingston30 min
Nov 25, 12:58 PM CSTSpecial Weather StatementLIXSaint James32 min
Nov 25, 2:08 PM CSTSpecial Weather StatementLIXSaint Charles37 min
Nov 25, 2:48 PM CSTSpecial Weather StatementLIXOrleans, Saint Charles27 min
Nov 25, 3:09 PM CSTSpecial Weather StatementLIXOrleans36 min
Nov 25, 3:14 PM CSTSevere Thunderstorm WarningLIXJefferson, Saint Charles16 min
Nov 25, 3:44 PM CSTSpecial Weather StatementLIXOrleans, Saint Charles46 min
Nov 25, 3:54 PM CSTAreal Flood AdvisoryLIXJefferson, Orleans, Saint Bernard3 hr
Nov 25, 4:19 PM CSTSevere Thunderstorm WarningLIXJefferson, Orleans, Saint Bernard26 min
Nov 25, 4:42 PM CSTSpecial Weather StatementLIXOrleans33 min
Nov 25, 4:50 PM CSTSpecial Weather StatementLIXOrleans25 min
Nov 25, 5:19 PM CSTSpecial Weather StatementLIXOrleans41 min
Nov 25, 5:59 PM CSTSpecial Weather StatementLIXOrleans31 min
Nov 25, 6:47 AM CSTSpecial Weather StatementLIXWilkinson58 min
Nov 25, 10:59 AM CSTSpecial Weather StatementLIXWalthall16 min
Nov 25, 1:51 PM CSTSpecial Weather StatementLIXPearl River24 min
Nov 25, 2:10 PM CSTSpecial Weather StatementLIXPearl River35 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2020Every severe thunderstorm warning in 2020

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.