Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 81, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Aug 3, 2021, 3:28 PM CDT for Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 2 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 3, 2021, 3:28 PM CDT (20:28 UTC)
- Expired
- Aug 3, 2021, 5:30 PM CDT
- In force
- 2 hr
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Saint Charles Parish, LA, Saint John the Baptist Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 8.5 hours before the alert went out and 77 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
- 928 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 708 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
699
WGUS54 KLIX 032028
FFWLIX
LAC089-095-032330-
/O.NEW.KLIX.FF.W.0081.210803T2028Z-210803T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
328 PM CDT Tue Aug 3 2021
The National Weather Service in New Orleans has issued a
* Flash Flood Warning for...
Northwestern St. Charles Parish in southeastern Louisiana...
Central St. John The Baptist Parish in southeastern Louisiana...
* Until 630 PM CDT.
* At 328 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 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...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...
Hahnville, Laplace, Reserve, Norco, Taft, New Sarpy, Montz,
Destrehan, Killona, St. Rose, Luling, Ama and Edgard.
This includes the following Interstates...
Interstate 310 between mile markers 2 and 8.
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.
Stay away or be swept away. River banks and culverts can become
unstable and unsafe.
&&
LAT...LON 3004 9054 3005 9052 3006 9051 3009 9053
3011 9052 3008 9042 3004 9044 3002 9041
3003 9034 2998 9028 2992 9032 2992 9042
2995 9044 3000 9054
FLASH FLOOD...RADAR INDICATED
$$
CAB3 follow-up statements
776
WGUS74 KLIX 032100
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
400 PM CDT Tue Aug 3 2021
LAC095-032110-
/O.CAN.KLIX.FF.W.0081.000000T0000Z-210803T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. John The Baptist LA-
400 PM CDT Tue Aug 3 2021
...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL ST. JOHN THE BAPTIST
PARISH...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 3001 9050 3001 9048 3002 9041 3001 9039
2997 9031 2992 9032 2993 9040 2995 9044
3000 9050
$$
LAC089-032330-
/O.CON.KLIX.FF.W.0081.000000T0000Z-210803T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Charles LA-
400 PM CDT Tue Aug 3 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM CDT THIS
EVENING FOR NORTHWESTERN ST. CHARLES PARISH...
At 400 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1.5 and 4 inches of rain have
fallen. Additional rainfall amounts of 0.5 to 1.5 inches are
possible in 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...
Hahnville, New Sarpy, Norco, Destrehan, Taft, Montz, Luling, St.
Rose, Killona and Ama.
This includes the following Interstates...
Interstate 310 between mile markers 3 and 8.
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.
Stay away or be swept away. River banks and culverts can become
unstable and unsafe.
&&
LAT...LON 3001 9050 3001 9048 3002 9041 3001 9039
2997 9031 2992 9032 2993 9040 2995 9044
3000 9050
FLASH FLOOD...RADAR INDICATED
$$
CAB393
WGUS74 KLIX 032158
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
458 PM CDT Tue Aug 3 2021
LAC089-032330-
/O.CON.KLIX.FF.W.0081.000000T0000Z-210803T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Charles LA-
458 PM CDT Tue Aug 3 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM CDT THIS
EVENING FOR NORTHWESTERN ST. CHARLES PARISH...
At 458 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1.5 and 4 inches of rain have
fallen. Additional rainfall amounts of 0.5 to 1.5 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
Currently most of the warned area is not seeing rain but there are
storms only 5 to 10 miles to the west that may still move into the
warned area. Warning will continue for now unless this activity
dissipates or moves south.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Hahnville, New Sarpy, Norco, Destrehan, Taft, Montz, Luling, St.
Rose, Killona and Ama.
This includes the following Interstates...
Interstate 310 between mile markers 4 and 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Stay away or be swept away. River banks and culverts can become
unstable and unsafe.
&&
LAT...LON 3001 9050 3001 9048 3002 9041 3001 9039
2997 9031 2992 9032 2993 9040 2995 9044
3000 9050
FLASH FLOOD...RADAR INDICATED
$$
CAB395
WGUS74 KLIX 032230
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
530 PM CDT Tue Aug 3 2021
LAC089-032240-
/O.CAN.KLIX.FF.W.0081.000000T0000Z-210803T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Charles LA-
530 PM CDT Tue Aug 3 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN ST. CHARLES
PARISH...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3001 9050 3001 9048 3002 9041 3001 9039
2997 9031 2992 9032 2993 9040 2995 9044
3000 9050
$$
CABThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 4:23 AM CDT | Special Marine Warning | LIX | 67 min | |
| Aug 3, 6:33 AM CDT | Special Weather Statement | LIX | Plaquemines | 27 min |
| Aug 3, 6:44 AM CDT | Special Weather Statement | LIX | Ascension, Lafourche, Saint James | 61 min |
| Aug 3, 7:47 AM CDT | Special Weather Statement | LIX | Saint Charles, Saint John the Baptist | 88 min |
| Aug 3, 8:42 AM CDT | Special Marine Warning | LIX | 63 min | |
| Aug 3, 8:50 AM CDT | Areal Flood Advisory | LIX | Orleans, Saint Bernard | 19 min |
| Aug 3, 9:09 AM CDT | Flash Flood Warning | LIX | Orleans | 2 hr |
| Aug 3, 10:04 AM CDT | Special Marine Warning | LIX | 86 min | |
| Aug 3, 10:24 AM CDT | Special Marine Warning | LIX | 96 min | |
| Aug 3, 10:40 AM CDT | Areal Flood Advisory | LIX | Ascension, East Baton Rouge, Livingston | 90 min |
| Aug 3, 10:53 AM CDT | Areal Flood Advisory | LIX | Ascension, East Baton Rouge, Livingston | 77 min |
| Aug 3, 11:04 AM CDT | Special Marine Warning | LIX | 116 min | |
| Aug 3, 11:40 AM CDT | Special Marine Warning | LIX | 110 min | |
| Aug 3, 11:49 AM CDT | Special Marine Warning | LIX | 86 min | |
| Aug 3, 11:52 AM CDT | Special Marine Warning | LIX | 113 min | |
| Aug 3, 2:45 PM CDT | Flash Flood Warning | LIX | East Baton Rouge, Livingston | 4 hr |
| Aug 3, 3:00 PM CDT | Areal Flood Advisory | LIX | Jefferson, Orleans, Saint Charles, Saint John the Baptist | 3 hr |
| Aug 3, 3:39 PM CDT | Areal Flood Advisory | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard | 119 min |
| Aug 3, 3:52 PM CDT | Areal Flood Advisory | LIX | Ascension, Saint Charles, Saint James, Saint John the Baptist | 103 min |
| Aug 3, 4:39 PM CDT | Areal Flood Advisory | LIX | Saint Charles, Saint James, Saint John the Baptist | 50 min |
| Aug 3, 4:53 PM CDT | Flash Flood Warning | LIX | Saint James, Saint John the Baptist | 39 min |
| Aug 3, 5:27 PM CDT | Areal Flood Advisory | LIX | Saint Tammany, Tangipahoa, Washington | 3 hr |
| Aug 3, 5:33 PM CDT | Areal Flood Advisory | LIX | Saint Tammany | 117 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.