Alert archive / Louisiana / Flash Flood Warnings in 2023

Flash Flood Warning 33, NWS New Orleans, LA

July 8, 2023Jefferson Parish, Orleans Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jul 8, 2023, 1:42 PM CDT for Jefferson Parish, Orleans Parish, Louisiana. It was in force for 113 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
Jul 8, 2023, 1:42 PM CDT (18:42 UTC)
Expired
Jul 8, 2023, 3:35 PM CDT
In force
113 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Jefferson Parish, LA, Orleans Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.7 hours before the alert went out and 51 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 2023-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 877 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 2023-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -42 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
877 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
1090 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-42 m²/s²
0-3 km storm-relative helicity
-46 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
Jul 8, 4:13 AM CDTSpecial Marine WarningLIX92 min
Jul 8, 5:42 AM CDTSpecial Marine WarningLIX63 min
Jul 8, 6:54 AM CDTSpecial Marine WarningLIX96 min
Jul 8, 7:03 AM CDTSpecial Weather StatementLIXPlaquemines27 min
Jul 8, 7:17 AM CDTSpecial Marine WarningLIX88 min
Jul 8, 8:17 AM CDTSpecial Marine WarningLIX58 min
Jul 8, 8:41 AM CDTSpecial Marine WarningLIX64 min
Jul 8, 1:21 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans3 hr
Jul 8, 1:26 PM CDTSpecial Weather StatementLIXOrleans49 min
Jul 8, 1:54 PM CDTSpecial Marine WarningLIX96 min
Jul 8, 2:25 PM CDTSpecial Weather StatementLIXSaint Tammany35 min
Jul 8, 2:56 PM CDTSpecial Weather StatementLIXWashington34 min
Jul 8, 12:08 PM CDTSpecial Weather StatementLIXHancock37 min
Jul 8, 1:28 PM CDTSpecial Weather StatementLIXPearl River32 min
Jul 8, 1:51 PM CDTSpecial Weather StatementLIXHancock39 min
Jul 8, 3:50 PM CDTSpecial Weather StatementLIXPearl River25 min

Nearby

Flash Flood Warnings in Louisiana, 2023Every flash flood warning in 2023

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.