Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 96, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Aug 29, 2021, 11:45 PM CDT for Plaquemines Parish, Louisiana. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 29, 2021, 11:45 PM CDT (04:45 UTC)
- Expired
- Aug 30, 2021, 10:00 AM CDT
- In force
- 10 hr
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Emergency
- Flash flood emergency
- Damage threat
- Catastrophic
- Flood severity
- None
County Plaquemines Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 4.8 hours before the alert went out and 68 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.
- Mixed-layer CAPE
- 25 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 679 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
242
WGUS54 KLIX 300445
FFWLIX
LAC075-301045-
/O.NEW.KLIX.FF.W.0096.210830T0445Z-210830T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
1145 PM CDT Sun Aug 29 2021
...FLASH FLOOD EMERGENCY FOR ALLIANCE...
The National Weather Service in New Orleans has issued a
* Flash Flood Warning for...
Northwestern Plaquemines Parish in southeastern Louisiana...
* Until 545 AM CDT.
* At 1145 PM CDT, emergency management reported flash flooding to a
Levee failure near hwy 23. Flash flooding is already occurring.
This is a FLASH FLOOD EMERGENCY for Alliance. This is a
PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!
HAZARD...Life threatening flash flooding from a levee failure.
SOURCE...Emergency management reported.
IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK
HIGHER GROUND NOW! Life threatening flash flooding of
low water crossings, small creeks and streams, urban
areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
mainly rural areas of Northwestern Plaquemines Parish
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 2972 9000 2970 8998 2967 8996 2965 9001
2972 9001
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC
$$
CAB1 follow-up statement
292
WGUS54 KLIX 301034
FFWLIX
LAC075-301500-
/O.EXT.KLIX.FF.W.0096.000000T0000Z-210830T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
Issued by National Weather Service Lake Charles LA
534 AM CDT Mon Aug 30 2021
...FLASH FLOOD EMERGENCY FOR ALLIANCE...
The National Weather Service in New Orleans has extended the
* Flash Flood Warning for...
Northwestern Plaquemines Parish in southeastern Louisiana...
* Until 1000 AM CDT.
* At 534 AM CDT, emergency management reported flash flooding in
Levee faliure near hwy 23. Flash flooding is already occurring.
This is a FLASH FLOOD EMERGENCY for Alliance. This is a
PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...Emergency management reported.
IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK
HIGHER GROUND NOW! Life threatening flash flooding of
low water crossings, small creeks and streams, urban
areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
mainly rural areas of Northwestern Plaquemines Parish
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 2972 9000 2970 8998 2967 8996 2965 9001
2972 9001
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC
$$The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 7:48 PM CDT | Flash Flood Warning | LIX | Saint Charles, Saint John the Baptist | 2 hr |
| Aug 29, 8:00 PM CDT | Special Marine Warning | LIX | 30 min | |
| Aug 29, 8:22 PM CDT | Tornado Warning | LIX | Saint Tammany | 38 min |
| Aug 29, 8:35 PM CDT | Flash Flood Warning | LIX | Saint Charles, Saint John the Baptist | 6 hr |
| Aug 29, 8:55 PM CDT | Flash Flood Warning | LIX | Livingston, Tangipahoa | 3 hr |
| Aug 29, 9:05 PM CDT | River Flood Warning | LIX | Saint Tammany | 12 days |
| Aug 29, 9:05 PM CDT | River Flood Warning | LIX | Saint Tammany | 21 days |
| Aug 29, 9:05 PM CDT | River Flood Warning | LIX | Washington | 63 hr |
| Aug 29, 9:05 PM CDT | River Flood Warning | LIX | Saint Tammany, Washington | 11 days |
| Aug 29, 10:39 PM CDT | Special Marine Warning | LIX | 51 min | |
| Aug 29, 10:48 PM CDT | Flash Flood Warning | LIX | Jefferson | 15 hr |
| Aug 29, 10:55 PM CDT | Special Marine Warning | LIX | 20 min | |
| Aug 29, 11:50 PM CDT | Flash Flood Warning | LIX | Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington | 3 hr |
| Aug 30, 12:05 AM CDT | Flash Flood Warning | LIX | Livingston, Tangipahoa | 12 hr |
| Aug 30, 1:24 AM CDT | Flash Flood Warning | LIX | Livingston, Saint Helena | 8 hr |
| Aug 30, 2:24 AM CDT | Flash Flood Warning | LIX | Saint Charles, Saint John the Baptist | 8 hr |
| Aug 30, 2:39 AM CDT | Flash Flood Warning | LIX | Saint Tammany | 9 hr |
| Aug 30, 2:55 AM CDT | Flash Flood Warning | LIX | Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington | 5 hr |
| Aug 30, 3:55 AM CDT | Flash Flood Warning | LIX | East Feliciana, Saint Helena, Tangipahoa, Washington | 5 hr |
| Aug 30, 4:19 AM CDT | Small Craft Advisory | LIX | 39 hr | |
| Aug 30, 4:51 AM CDT | Coastal Flood Advisory | LIX | Assumption | 15 hr |
| Aug 30, 7:15 AM CDT | Special Marine Warning | LIX | 30 min | |
| Aug 30, 7:18 AM CDT | Special Marine Warning | LIX | 27 min | |
| Aug 30, 7:45 AM CDT | Flash Flood Warning | LIX | Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington | 3 hr |
| Aug 30, 9:01 AM CDT | Special Marine Warning | LIX | 89 min | |
| Aug 30, 9:58 AM CDT | Areal Flood Warning | LIX | Jefferson, Lafourche, Livingston, Plaquemines, Saint Charles, Saint James and 1 more | 60 hr |
| Aug 30, 10:53 AM CDT | Areal Flood Warning | LIX | Saint Tammany, Tangipahoa, Washington | 35 hr |
| Aug 30, 11:04 AM CDT | Areal Flood Warning | LIX | Saint Helena, Saint Tammany, Tangipahoa, Washington | 35 hr |
| Aug 30, 11:34 AM CDT | Areal Flood Warning | LIX | Saint Tammany, Washington | 34 hr |
| Aug 30, 12:24 PM CDT | Areal Flood Warning | LIX | Ascension, Livingston, Saint John the Baptist, Saint Tammany, Tangipahoa | 33 hr |
| Aug 30, 2:57 PM CDT | Heat Advisory | LIX | Assumption, East Baton Rouge, Iberville, Orleans, Saint Bernard, Saint James and 2 more | 26 hr |
| Aug 30, 6:10 PM CDT | Special Marine Warning | LIX | 95 min |
Nearby
Flash Flood Warnings in Louisiana, 2021Every flash flood warning in 2021
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.