Alert archive / Louisiana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 111, NWS New Orleans, LA

August 16, 20206 parishes in Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Aug 16, 2020, 9:58 PM CDT for 6 parishes in 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
Aug 16, 2020, 9:58 PM CDT (02:58 UTC)
Expired
Aug 16, 2020, 10:30 PM CDT
In force
32 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint John the Baptist Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 3.0 hours before the alert went out and 56 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 2020-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1735 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 2020-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 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
1735 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
1653 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
-9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 8:19 PM CDTSpecial Weather StatementLIXWashington26 min
Aug 16, 8:22 PM CDTSevere Thunderstorm WarningLIXWashington53 min
Aug 16, 8:35 PM CDTSevere Thunderstorm WarningLIXTangipahoa, Washington40 min
Aug 16, 8:45 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington45 min
Aug 16, 8:59 PM CDTSpecial Weather StatementLIXSaint Tammany31 min
Aug 16, 9:08 PM CDTSpecial Marine WarningLIX67 min
Aug 16, 9:11 PM CDTSevere Thunderstorm WarningLIXSaint Tammany34 min
Aug 16, 9:23 PM CDTSpecial Weather StatementLIXLivingston37 min
Aug 16, 9:27 PM CDTSevere Thunderstorm WarningLIXJefferson, Orleans, Saint Bernard, Saint Charles, Saint John the Baptist48 min
Aug 16, 10:12 PM CDTSpecial Weather StatementLIXJefferson, Lafourche63 min
Aug 16, 10:29 PM CDTSpecial Weather StatementLIXAssumption, Iberville, Terrebonne61 min
Aug 16, 10:36 PM CDTSpecial Marine WarningLIX54 min
Aug 16, 11:00 PM CDTSpecial Marine WarningLIX60 min
Aug 16, 11:23 PM CDTSpecial Weather StatementLIXTerrebonne37 min
Aug 16, 11:25 PM CDTSpecial Marine WarningLIX65 min
Aug 17, 12:32 AM CDTSpecial Marine WarningLIX58 min
Aug 17, 1:38 AM CDTSpecial Marine WarningLIX67 min
Aug 17, 2:44 AM CDTSpecial Marine WarningLIX61 min
Aug 17, 3:17 AM CDTSpecial Marine WarningLIX58 min
Aug 17, 3:28 AM CDTSpecial Marine WarningLIX62 min
Aug 17, 4:13 AM CDTSpecial Marine WarningLIX2 hr
Aug 17, 10:15 AM CDTSpecial Marine WarningLIX45 min
Aug 16, 7:34 PM CDTSpecial Weather StatementLIXWalthall56 min
Aug 16, 7:44 PM CDTSevere Thunderstorm WarningLIXWalthall46 min
Aug 17, 4:59 AM CDTSpecial Weather StatementLIXHancock31 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.