Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 86, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Aug 29, 2021, 3:39 PM CDT for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 7 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, 3:39 PM CDT (20:39 UTC)
- Expired
- Aug 29, 2021, 10:18 PM CDT
- In force
- 7 hr
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Lafourche Parish, LA, Terrebonne Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 8.7 hours before the alert went out and 111 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3256 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -55 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.3
The text
As transmitted.
274
WGUS54 KLIX 292039
FFWLIX
LAC057-109-300230-
/O.NEW.KLIX.FF.W.0086.210829T2039Z-210830T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
339 PM CDT Sun Aug 29 2021
The National Weather Service in New Orleans has issued a
* Flash Flood Warning for...
Central Lafourche Parish in southeastern Louisiana...
Northeastern Terrebonne Parish in southeastern Louisiana...
* Until 930 PM CDT.
* At 339 PM CDT, Doppler radar indicated tropical rainbands and
thunderstorms producing persistent heavy rain across the warned
area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by persistent heavy rainfall and
slow drainage due to high tides and storm surge.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Houma, Larose, Cut Off, Galliano, Lockport, Golden Meadow,
Montegut, Mathews, Chauvin, Raceland, Bayou Cane and Gray.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 2972 9063 2973 9058 2971 9052 2963 9043
2962 9040 2957 9035 2937 9026 2935 9030
2947 9041 2951 9049 2947 9056 2951 9065
2953 9079 2956 9081 2961 9081 2966 9076
FLASH FLOOD...RADAR INDICATED
$$
TD2 follow-up statements
897
WGUS54 KLIX 300222
FFWLIX
LAC057-109-300330-
/O.EXT.KLIX.FF.W.0086.000000T0000Z-210830T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
922 PM CDT Sun Aug 29 2021
The National Weather Service in New Orleans has extended the
* Flash Flood Warning for...
Central Lafourche Parish in southeastern Louisiana...
Northeastern Terrebonne Parish in southeastern Louisiana...
* Until 1030 PM CDT.
* At 922 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Houma, Larose, Cut Off, Galliano, Lockport, Golden Meadow,
Montegut, Mathews, Chauvin, Raceland, Bayou Cane and Gray.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 2972 9063 2973 9058 2971 9052 2963 9043
2962 9040 2957 9035 2937 9026 2935 9030
2947 9041 2951 9049 2947 9056 2951 9065
2953 9079 2956 9081 2961 9081 2966 9076
FLASH FLOOD...RADAR INDICATED
$$
BL963
WGUS74 KLIX 300318
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
1018 PM CDT Sun Aug 29 2021
LAC057-109-300328-
/O.CAN.KLIX.FF.W.0086.000000T0000Z-210830T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lafourche LA-Terrebonne LA-
1018 PM CDT Sun Aug 29 2021
...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL LAFOURCHE AND
NORTHEASTERN TERREBONNE PARISHES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 700 AM CDT Tuesday for
portions of southeast Louisiana and Mississippi.
LAT...LON 2972 9063 2973 9058 2971 9052 2963 9043
2962 9040 2957 9035 2937 9026 2935 9030
2947 9041 2951 9049 2947 9056 2951 9065
2953 9079 2956 9081 2961 9081 2966 9076
$$
CABThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 6:23 AM CDT | Special Marine Warning | LIX | 22 min | |
| Aug 29, 7:49 AM CDT | Extreme Wind Warning | LIX | Jefferson, Lafourche, Plaquemines, Saint Bernard, Saint Charles, Terrebonne | 3 hr |
| Aug 29, 10:30 AM CDT | Extreme Wind Warning | LIX | Jefferson, Lafourche, Plaquemines, Saint Bernard, Saint Charles, Terrebonne | 3 hr |
| Aug 29, 1:26 PM CDT | Extreme Wind Warning | LIX | Assumption, Jefferson, Lafourche, Plaquemines, Saint Charles, Saint James and 2 more | 3 hr |
| Aug 29, 2:42 PM CDT | Special Marine Warning | LIX | 18 min | |
| Aug 29, 4:08 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint John the Baptist | 8 hr |
| Aug 29, 4:23 PM CDT | Extreme Wind Warning | LIX | Jefferson, Lafourche, Saint Charles, Saint James, Saint John the Baptist, Terrebonne | 2 hr |
| Aug 29, 5:01 PM CDT | Flash Flood Warning | LIX | Plaquemines | 6 hr |
| Aug 29, 5:04 PM CDT | Special Marine Warning | LIX | 26 min | |
| Aug 29, 6:04 PM CDT | Special Marine Warning | LIX | 26 min | |
| Aug 29, 6:09 PM CDT | Flash Flood Warning | LIX | Saint Tammany | 8 hr |
| Aug 29, 6:21 PM CDT | Flash Flood Warning | LIX | Saint Tammany | 16 hr |
| Aug 29, 6:25 PM CDT | Tornado Warning | LIX | Orleans, Saint Bernard, Saint Tammany | 35 min |
| Aug 29, 6:33 PM CDT | Special Marine Warning | LIX | 57 min | |
| Aug 29, 6:54 PM CDT | Tornado Warning | LIX | Saint Tammany | 36 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.