Alert archive / Louisiana / Flash Flood Warnings in 2025

Flash Flood Warning 47, NWS New Orleans, LA

August 28, 2025Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Aug 28, 2025, 10:26 PM CDT for Saint Tammany 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
Aug 28, 2025, 10:26 PM CDT (03:26 UTC)
Expired
Aug 28, 2025, 11:30 PM CDT
In force
64 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

County Saint Tammany Parish, LA

The radar

The Hammond radar (KHDC), 45 km from the middle of the area, began a volume at 03:28 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

Jackson, MS (KJAN), launched 00:00Z, 3.4 hours before the alert went out and 213 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 2025-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2025-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
912 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
164 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 9:34 PM CDTAreal Flood AdvisoryLIXSaint Tammany52 min
Aug 28, 10:53 PM CDTAreal Flood AdvisoryLIXSaint Tammany53 min
Aug 28, 11:07 PM CDTSpecial Weather StatementLIXEast Feliciana38 min
Aug 28, 11:28 PM CDTSpecial Weather StatementLIXSaint Helena47 min
Aug 28, 11:58 PM CDTAreal Flood AdvisoryLIXSaint Tammany3 hr
Aug 29, 2:48 AM CDTAreal Flood AdvisoryLIXSaint Tammany3 hr
Aug 29, 4:23 AM CDTAreal Flood AdvisoryLIXSaint Tammany69 min
Aug 29, 4:52 AM CDTFlash Flood WarningLIXSaint Tammany33 min
Aug 29, 12:52 PM CDTAreal Flood AdvisoryLIXEast Baton Rouge, Livingston, West Baton Rouge113 min
Aug 28, 10:18 PM CDTSpecial Weather StatementLIXWilkinson42 min
Aug 28, 10:40 PM CDTSevere Thunderstorm WarningLIXWilkinson50 min
Aug 29, 12:18 AM CDTFlash Flood WarningLIXHancock3 hr

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.