Alert archive / Louisiana / Flash Flood Warnings in 2025

Flash Flood Warning 30, NWS New Orleans, LA

May 29, 2025Jefferson Parish, Orleans Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at May 29, 2025, 1:09 PM CDT for Jefferson Parish, Orleans Parish, Saint Bernard Parish, Louisiana. It was in force for 66 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
May 29, 2025, 1:09 PM CDT (18:09 UTC)
Expired
May 29, 2025, 2:15 PM CDT
In force
66 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 radar

The Hammond radar (KHDC), 84 km from the middle of the area, began a volume at 18:13 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.2 hours before the alert went out and 48 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 2025-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 618 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 2025-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 square meters per square second.19395878Sfc1 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
618 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
510 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
212 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.7

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 7:38 PM CDTSpecial Weather StatementLIXAssumption, Lafourche, Saint Charles, Saint James52 min
May 28, 8:26 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Plaquemines, Saint Bernard114 min
May 28, 8:49 PM CDTSpecial Weather StatementLIXJefferson56 min
May 28, 11:12 PM CDTSpecial Marine WarningLIX94 min
May 29, 12:41 AM CDTSpecial Marine WarningLIX64 min
May 29, 2:04 AM CDTSpecial Marine WarningLIX56 min
May 29, 6:12 AM CDTSpecial Marine WarningLIX93 min
May 29, 7:53 AM CDTSpecial Marine WarningLIX2 hr
May 29, 8:02 AM CDTSpecial Weather StatementLIXJefferson43 min
May 29, 8:05 AM CDTSpecial Weather StatementLIXTerrebonne40 min
May 29, 9:44 AM CDTSpecial Marine WarningLIX56 min
May 29, 9:55 AM CDTSpecial Marine WarningLIX65 min
May 29, 10:25 AM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Saint Bernard67 min
May 29, 12:02 PM CDTSpecial Weather StatementLIXOrleans43 min
May 29, 12:52 PM CDTSpecial Marine WarningLIX83 min
May 29, 12:52 PM CDTSpecial Marine WarningLIX83 min
May 29, 1:44 PM CDTSpecial Weather StatementLIXSaint Charles31 min
May 29, 2:19 PM CDTSpecial Weather StatementLIXJefferson56 min
May 29, 3:11 PM CDTSpecial Weather StatementLIXJefferson, Lafourche49 min
May 29, 3:58 PM CDTSevere Thunderstorm WarningLIXJefferson, Saint Charles24 min
May 29, 4:00 PM CDTSpecial Weather StatementLIXJefferson, Lafourche, Plaquemines45 min
May 29, 4:24 PM CDTSpecial Marine WarningLIX66 min
May 29, 4:46 PM CDTSpecial Weather StatementLIXJefferson, Lafourche44 min
May 29, 6:06 PM CDTSpecial Marine WarningLIX24 min
May 29, 6:34 PM CDTSpecial Marine WarningLIX26 min
May 28, 7:40 PM CDTSpecial Weather StatementLIXJackson35 min
May 28, 9:14 PM CDTSpecial Weather StatementLIXJackson76 min
May 28, 9:25 PM CDTSevere Thunderstorm WarningLIXJackson80 min
May 29, 8:19 AM CDTSpecial Weather StatementLIXJackson41 min

Nearby

Flash Flood Warnings in Louisiana, 2025Every flash flood warning in 2025

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; radar from the NEXRAD Level II archive.