Alert archive / Louisiana / Flash Flood Warnings in 2023

Flash Flood Warning 37, NWS New Orleans, LA

July 22, 2023Jefferson Parish, Orleans Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jul 22, 2023, 7:30 PM CDT for Jefferson Parish, Orleans Parish, Saint Bernard Parish, Louisiana. It was in force for 64 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 22, 2023, 7:30 PM CDT (00:30 UTC)
Expired
Jul 22, 2023, 8:34 PM CDT
In force
64 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Jefferson Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 0.5 hours before the alert went out and 272 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, Jackson, MS at 00:00Z on 2023-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 836 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, Jackson, MS at 00:00Z on 2023-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.193958Sfc1 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
836 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1192 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 7:02 PM CDTSpecial Marine WarningLIX88 min
Jul 22, 7:10 PM CDTSevere Thunderstorm Warning Considerable damage threatLIXJefferson, Orleans, Saint Bernard22 min
Jul 22, 7:19 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Saint Bernard11 min
Jul 22, 7:43 PM CDTSpecial Weather StatementLIXOrleans, Saint Charles47 min
Jul 22, 7:58 PM CDTSpecial Marine WarningLIX62 min
Jul 22, 8:04 PM CDTSpecial Marine WarningLIX116 min
Jul 22, 8:07 PM CDTSpecial Weather StatementLIXJefferson, Lafourche, Plaquemines53 min
Jul 22, 8:10 PM CDTSpecial Marine WarningLIX95 min
Jul 22, 8:11 PM CDTSpecial Weather StatementLIXTerrebonne49 min
Jul 22, 8:16 PM CDTSpecial Weather StatementLIXWest Feliciana29 min
Jul 22, 8:49 PM CDTSpecial Weather StatementLIXWest Feliciana26 min
Jul 22, 8:57 PM CDTSpecial Marine WarningLIX104 min
Jul 22, 8:59 PM CDTSpecial Marine WarningLIX2 hr
Jul 22, 9:01 PM CDTSpecial Weather StatementLIXPlaquemines89 min
Jul 22, 10:07 PM CDTSpecial Marine WarningLIX53 min
Jul 23, 6:05 AM CDTSpecial Marine WarningLIX55 min
Jul 23, 6:44 AM CDTSpecial Weather StatementLIXTerrebonne31 min
Jul 23, 7:18 AM CDTSpecial Weather StatementLIXAssumption, Saint James42 min
Jul 23, 7:57 AM CDTSpecial Weather StatementLIXSaint James, Saint John the Baptist33 min
Jul 23, 8:25 AM CDTSpecial Weather StatementLIXSaint Charles35 min
Jul 23, 8:30 AM CDTSpecial Marine WarningLIX60 min
Jul 23, 8:33 AM CDTSpecial Weather StatementLIXSaint John the Baptist27 min
Jul 23, 8:40 AM CDTSpecial Marine WarningLIX35 min
Jul 23, 9:02 AM CDTSpecial Weather StatementLIXOrleans28 min
Jul 23, 9:22 AM CDTSpecial Marine WarningLIX23 min
Jul 23, 3:04 PM CDTSpecial Weather StatementLIXLafourche26 min
Jul 23, 3:33 PM CDTSpecial Weather StatementLIXJefferson27 min
Jul 23, 3:36 PM CDTSpecial Marine WarningLIX24 min
Jul 23, 4:06 PM CDTSpecial Marine WarningLIX27 min
Jul 23, 4:20 PM CDTSpecial Marine WarningLIX55 min
Jul 23, 4:41 PM CDTSpecial Weather StatementLIXJefferson34 min
Jul 23, 4:49 PM CDTSpecial Weather StatementLIXSaint Bernard41 min
Jul 23, 5:51 PM CDTSpecial Marine WarningLIX54 min
Jul 23, 5:54 PM CDTSpecial Weather StatementLIXTerrebonne51 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.