Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 109, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Aug 31, 2021, 2:49 PM CDT for 5 parishes in Louisiana. It was in force for 88 min. 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 31, 2021, 2:49 PM CDT (19:49 UTC)
- Expired
- Aug 31, 2021, 4:17 PM CDT
- In force
- 88 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 7.8 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.
- Mixed-layer CAPE
- 321 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 871 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 186 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.7
The text
As transmitted.
189
WGUS54 KLIX 311949
FFWLIX
LAC051-071-075-087-089-312300-
/O.NEW.KLIX.FF.W.0109.210831T1949Z-210831T2300Z/
/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
249 PM CDT Tue Aug 31 2021
The National Weather Service in New Orleans has issued a
* Flash Flood Warning for...
Northwestern Jefferson Parish in southeastern Louisiana...
Southwestern Orleans Parish in southeastern Louisiana...
Northwestern Plaquemines Parish in southeastern Louisiana...
West Central St. Bernard Parish in southeastern Louisiana...
Northeastern St. Charles Parish in southeastern Louisiana...
* Until 600 PM CDT.
* At 249 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3.5 inches of
rain have fallen. Additional rainfall amounts of 1 to 3 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
New Orleans, Timberlane, Belle Chasse, Harvey, Chalmette, Marrero,
Avondale, Metairie, Jefferson, Gretna, Harahan, Westwego,
Terrytown, Arabi, Woodmere, Estelle, Meraux, Violet, Poydras and
Bridge City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 2983 9025 2987 9033 2994 9038 2997 9037
3000 9031 2997 9015 2999 8998 2997 8985
2993 8982 2995 8975 2992 8976 2993 8975
2990 8974 2991 8974 2986 8968 2976 8974
2976 8985 2983 9007
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
jb2 follow-up statements
154
WGUS74 KLIX 312044
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
Issued by National Weather Service Lake Charles LA
344 PM CDT Tue Aug 31 2021
LAC051-071-075-087-089-312300-
/O.CON.KLIX.FF.W.0109.000000T0000Z-210831T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson LA-Orleans LA-Plaquemines LA-St. Bernard LA-St. Charles LA-
344 PM CDT Tue Aug 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM CDT THIS EVENING
FOR NORTHWESTERN JEFFERSON, SOUTHWESTERN ORLEANS, NORTHWESTERN
PLAQUEMINES, WEST CENTRAL ST. BERNARD AND NORTHEASTERN ST. CHARLES
PARISHES...
At 344 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 4 inches of rain have
fallen, especially between Terrytown and Yscloskey. Additional
rainfall amounts of 1 to 3 inches are possible in the warned area.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
New Orleans, Timberlane, Belle Chasse, Harvey, Chalmette, Marrero,
Avondale, Metairie, Jefferson, Gretna, Harahan, Westwego,
Terrytown, Arabi, Woodmere, Estelle, Meraux, Violet, Poydras and
Bridge City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 2983 9025 2987 9033 2994 9038 2997 9037
3000 9031 2997 9015 2999 8998 2997 8985
2993 8982 2995 8975 2992 8976 2993 8975
2990 8974 2991 8974 2986 8968 2976 8974
2976 8985 2983 9007
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$279
WGUS74 KLIX 312117
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
Issued by National Weather Service Lake Charles LA
417 PM CDT Tue Aug 31 2021
LAC051-071-075-087-089-312127-
/O.CAN.KLIX.FF.W.0109.000000T0000Z-210831T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson LA-Orleans LA-Plaquemines LA-St. Bernard LA-St. Charles LA-
417 PM CDT Tue Aug 31 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN JEFFERSON,
SOUTHWESTERN ORLEANS, NORTHWESTERN PLAQUEMINES, WEST CENTRAL ST.
BERNARD AND NORTHEASTERN ST. CHARLES PARISHES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 2983 9025 2987 9033 2994 9038 2997 9037
3000 9031 2997 9015 2999 8998 2997 8985
2993 8982 2995 8975 2992 8976 2993 8975
2990 8974 2991 8974 2986 8968 2976 8974
2976 8985 2983 9007
$$The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 4:06 AM CDT | Heat Advisory | LIX | Assumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more | 38 hr |
| Aug 31, 10:02 AM CDT | Special Marine Warning | LIX | 118 min | |
| Aug 31, 1:21 PM CDT | Special Weather Statement | LIX | Saint Bernard | 39 min |
| Aug 31, 1:58 PM CDT | Special Weather Statement | LIX | Saint Bernard | 32 min |
| Aug 31, 3:52 PM CDT | Special Weather Statement | LIX | Saint Charles | 53 min |
| Aug 31, 4:23 PM CDT | Special Marine Warning | LIX | 2 hr | |
| Aug 31, 4:36 PM CDT | Special Weather Statement | LIX | Lafourche | 24 min |
| Aug 31, 4:44 PM CDT | Flash Flood Warning | LIX | Lafourche, Saint James, Saint John the Baptist | 3 hr |
| Aug 31, 5:05 PM CDT | Special Weather Statement | LIX | Lafourche | 25 min |
| Aug 31, 5:22 PM CDT | Special Weather Statement | LIX | Assumption | 53 min |
| Aug 31, 6:20 PM CDT | Flash Flood Warning | LIX | Saint Charles, Saint John the Baptist | 49 min |
| Aug 31, 6:50 PM CDT | Flash Flood Warning | LIX | Assumption, Lafourche, Terrebonne | 42 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.