Alert archive / Louisiana / Flash Flood Warnings in 2026

Flash Flood Warning 110, NWS New Orleans, LA

August 21, 2026Jefferson Parish, Orleans Parish, Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Aug 21, 2026, 3:18 PM CDT for Jefferson Parish, Orleans Parish, Plaquemines Parish, Louisiana. It was in force for 118 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 21, 2026, 3:18 PM CDT (20:18 UTC)
Expired
Aug 21, 2026, 5:16 PM CDT
In force
118 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA

The radar

The Hammond radar (KHDC), 95 km from the middle of the area, began a volume at 20:17 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, 8.3 hours before the alert went out and 59 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 2026-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2252 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 2026-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 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
2252 J/kg
Mixed-layer CIN
-102 J/kg
Mixed-layer LCL
1082 m above ground
0-6 km bulk shear
3 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
-22 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 21, 10:50 AM CDTHeat AdvisoryLIXAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more33 hr
Aug 21, 10:52 AM CDTSpecial Marine WarningLIX83 min
Aug 21, 2:01 PM CDTSpecial Weather StatementLIXSaint Tammany29 min
Aug 21, 2:44 PM CDTSevere Thunderstorm WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard46 min
Aug 21, 2:47 PM CDTSpecial Weather StatementLIXTangipahoa28 min
Aug 21, 3:01 PM CDTSevere Thunderstorm WarningLIXSaint Tammany31 min
Aug 21, 3:03 PM CDTSevere Thunderstorm Warning Considerable damage threatLIXSaint Helena, Tangipahoa42 min
Aug 21, 3:08 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Saint Helena52 min
Aug 21, 3:10 PM CDTSpecial Weather StatementLIXOrleans35 min
Aug 21, 3:18 PM CDTSpecial Weather StatementLIXSaint Tammany27 min
Aug 21, 3:31 PM CDTSevere Thunderstorm WarningLIXJefferson, Orleans44 min
Aug 21, 3:43 PM CDTSevere Thunderstorm WarningLIXSaint Tammany36 min
Aug 21, 3:56 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans3 hr
Aug 21, 3:57 PM CDTSevere Thunderstorm WarningLIXEast Feliciana, Livingston, Saint Helena, Tangipahoa48 min
Aug 21, 4:07 PM CDTSevere Thunderstorm Warning Considerable damage threatLIXWashington38 min
Aug 21, 4:35 PM CDTSevere Thunderstorm WarningLIXLivingston40 min
Aug 21, 4:58 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington32 min
Aug 21, 5:02 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa43 min
Aug 21, 5:14 PM CDTSevere Thunderstorm WarningLIXSaint Tammany46 min
Aug 21, 5:19 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Pointe Coupee, West Baton Rouge41 min
Aug 21, 5:28 PM CDTSpecial Marine WarningLIX92 min
Aug 21, 5:47 PM CDTSevere Thunderstorm WarningLIXIberville, Pointe Coupee, West Baton Rouge32 min
Aug 21, 6:10 PM CDTSevere Thunderstorm WarningLIXSaint James33 min
Aug 21, 6:31 PM CDTSevere Thunderstorm WarningLIXSaint Charles, Saint John the Baptist17 min
Aug 21, 6:36 PM CDTSpecial Weather StatementLIXOrleans24 min
Aug 21, 6:46 PM CDTSevere Thunderstorm WarningLIXOrleans, Saint Bernard31 min
Aug 20, 7:13 PM CDTSpecial Weather StatementLIXWalthall47 min
Aug 20, 7:52 PM CDTSevere Thunderstorm WarningLIXPike, Walthall68 min
Aug 20, 9:02 PM CDTSpecial Weather StatementLIXWalthall28 min
Aug 21, 2:01 PM CDTSpecial Weather StatementLIXPike44 min
Aug 21, 2:03 PM CDTSpecial Weather StatementLIXHancock27 min
Aug 21, 2:15 PM CDTSevere Thunderstorm WarningLIXHancock45 min
Aug 21, 2:26 PM CDTSevere Thunderstorm WarningLIXAmite, Pike49 min
Aug 21, 2:39 PM CDTSevere Thunderstorm WarningLIXHarrison51 min
Aug 21, 2:50 PM CDTSevere Thunderstorm Warning Considerable damage threatLIXAmite40 min
Aug 21, 3:36 PM CDTSevere Thunderstorm Warning Considerable damage threatLIXWalthall39 min
Aug 21, 3:46 PM CDTSevere Thunderstorm WarningLIXWilkinson33 min
Aug 21, 4:17 PM CDTSevere Thunderstorm Warning Considerable damage threatLIXPearl River43 min
Aug 21, 4:22 PM CDTSevere Thunderstorm WarningLIXAmite, Wilkinson38 min
Aug 21, 5:10 PM CDTSevere Thunderstorm WarningLIXPike, Walthall50 min
Aug 21, 5:21 PM CDTSevere Thunderstorm WarningLIXAmite, Pike, Wilkinson39 min
Aug 21, 5:57 PM CDTSevere Thunderstorm WarningLIXAmite18 min

Nearby

Flash Flood Warnings in Louisiana, 2026Every flash flood warning in 2026

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.