Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 121, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Sep 15, 2021, 8:18 AM CDT for Orleans Parish, Saint Tammany Parish, Washington Parish, Louisiana. It was in force for 5 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
- Sep 15, 2021, 8:18 AM CDT (13:18 UTC)
- Expired
- Sep 15, 2021, 1:15 PM CDT
- In force
- 5 hr
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Orleans Parish, LA, Saint Tammany Parish, LA, Washington Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 1.3 hours before the alert went out and 24 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
- 84 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 695 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 285 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
452
WGUS54 KLIX 151318
FFWLIX
LAC071-103-117-151615-
/O.NEW.KLIX.FF.W.0121.210915T1318Z-210915T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
818 AM CDT Wed Sep 15 2021
The National Weather Service in New Orleans has issued a
* Flash Flood Warning for...
Northern Orleans Parish in southeastern Louisiana...
St. Tammany Parish in southeastern Louisiana...
Washington Parish in southeastern Louisiana...
* Until 1115 AM CDT.
* At 818 AM CDT, trained weather spotters reported thunderstorms
producing heavy rain in Heavy rain ovenight and water covering
multiple roads. . Between 2 and 5.5 inches of rain have fallen.
The expected rainfall rate is 1 to 2 inches in 1 hour and 30
minutes. Additional rainfall amounts of 1 to 3 inches are possible
in the warned area. Flash flooding is ongoing or expected to begin
shortly. Heavy rain in combionation with debris and blocked
drainage areas is resulting in flash flooding across the parishes.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
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...
New Orleans, Slidell, Bogalusa, Covington, Franklinton, Pearl
River, Abita Springs, Varnado, Madisonville, Folsom, Sun, Bush,
Enon, Lacombe, Mount Herman, Pearlington, Angie and Slidell
Airport.
This includes the following Interstates...
Interstate 10 in Louisiana between mile markers 261 and 273.
Interstate 12 between mile markers 53 and 84.
Interstate 59 in Louisiana between mile markers 1 and 11.
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 3074 9025 3091 9035 3100 9035 3100 8973
3066 8985 3056 8980 3045 8968 3029 8965
3018 8956 3019 8955 3016 8957 3018 8969
3017 8969 3015 8963 3012 8965 3015 8975
3016 8969 3026 8998 3037 9009 3036 9024
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR AND 30 MINUTES
$$
CAB3 follow-up statements
053
WGUS54 KLIX 151605
FFWLIX
LAC071-103-117-151815-
/O.EXT.KLIX.FF.W.0121.000000T0000Z-210915T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
1105 AM CDT Wed Sep 15 2021
The National Weather Service in New Orleans has extended the
* Flash Flood Warning for...
Northern Orleans Parish in southeastern Louisiana...
St. Tammany Parish in southeastern Louisiana...
Washington Parish in southeastern Louisiana...
* Until 115 PM CDT.
* At 1105 AM CDT, trained weather spotters reported thunderstorms
producing heavy rain in Heavy rain ovenight and water covering
multiple roads. . Between 2 and 5.5 inches of rain have fallen.
The expected rainfall rate is 1 to 2 inches in 1 hour and 30
minutes. 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...Trained spotters reported.
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...
New Orleans, Slidell, Bogalusa, Covington, Franklinton, Pearl
River, Abita Springs, Varnado, Madisonville, Folsom, Sun, Bush,
Enon, Lacombe, Mount Herman, Pearlington, Angie and Slidell
Airport.
This includes the following Interstates...
Interstate 10 in Louisiana between mile markers 261 and 272.
Interstate 12 between mile markers 53 and 84.
Interstate 59 in Louisiana between mile markers 1 and 11.
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 3074 9025 3091 9035 3100 9035 3100 8973
3066 8985 3056 8980 3045 8968 3029 8965
3018 8956 3019 8955 3016 8957 3018 8969
3017 8969 3015 8963 3012 8965 3015 8975
3016 8969 3026 8998 3037 9009 3036 9024
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR AND 30 MINUTES
$$780
WGUS74 KLIX 151621
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
1121 AM CDT Wed Sep 15 2021
LAC071-151631-
/O.CAN.KLIX.FF.W.0121.000000T0000Z-210915T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Orleans LA-
1121 AM CDT Wed Sep 15 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHERN ORLEANS PARISH...
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 Thursday for
portions of southeast Louisiana and Mississippi.
LAT...LON 3074 9025 3081 9029 3089 9032 3091 9035
3100 9035 3100 8973 3079 8981 3079 8982
3078 8983 3075 8983 3075 8982 3073 8983
3071 8985 3070 8984 3066 8985 3056 8980
3037 9009 3039 9019 3037 9024
$$
LAC103-117-151815-
/O.CON.KLIX.FF.W.0121.000000T0000Z-210915T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Tammany LA-Washington LA-
1121 AM CDT Wed Sep 15 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM CDT THIS
AFTERNOON FOR NORTHWESTERN ST. TAMMANY AND WASHINGTON PARISHES...
At 1121 AM CDT, Doppler radar indicated thunderstorms producing
heavy and water covering multiple roads. Between 3 and 6 inches of
rain have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Bogalusa, Covington, Franklinton, Abita Springs, Varnado,
Madisonville, Folsom, Sun, Enon, Bush, Mount Herman and Angie.
This includes the following Interstates...
Interstate 12 between mile markers 53 and 66.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3074 9025 3081 9029 3089 9032 3091 9035
3100 9035 3100 8973 3079 8981 3079 8982
3078 8983 3075 8983 3075 8982 3073 8983
3071 8985 3070 8984 3066 8985 3056 8980
3037 9009 3039 9019 3037 9024
FLASH FLOOD...RADAR INDICATED
$$
MEFFER594
WGUS74 KLIX 151809
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
109 PM CDT Wed Sep 15 2021
LAC103-117-151819-
/O.EXP.KLIX.FF.W.0121.000000T0000Z-210915T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Tammany LA-Washington LA-
109 PM CDT Wed Sep 15 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 115 PM CDT THIS AFTERNOON FOR
NORTHWESTERN ST. TAMMANY AND WASHINGTON 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 Thursday for
portions of southeast Louisiana and Mississippi.
LAT...LON 3074 9025 3081 9029 3089 9032 3091 9035
3100 9035 3100 8973 3079 8981 3079 8982
3078 8983 3075 8983 3075 8982 3073 8983
3071 8985 3070 8984 3066 8985 3056 8980
3037 9009 3039 9019 3037 9024
$$The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 10:20 PM CDT | Special Weather Statement | LIX | Terrebonne | 55 min |
| Sep 14, 10:38 PM CDT | Tornado Warning | LIX | Terrebonne | 37 min |
| Sep 15, 2:33 AM CDT | Areal Flood Advisory | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles | 117 min |
| Sep 15, 3:12 AM CDT | Areal Flood Advisory | LIX | Tangipahoa | 2 hr |
| Sep 15, 3:29 AM CDT | Tornado Warning | LIX | Plaquemines, Saint Bernard | 31 min |
| Sep 15, 4:09 AM CDT | Tornado Warning | LIX | Orleans, Saint Bernard | 13 min |
| Sep 15, 4:32 AM CDT | Special Marine Warning | LIX | 58 min | |
| Sep 15, 5:21 AM CDT | Flash Flood Warning | LIX | Saint Tammany, Tangipahoa, Washington | 3 hr |
| Sep 15, 6:22 AM CDT | Tornado Warning | LIX | Saint Tammany | 23 min |
| Sep 15, 7:14 AM CDT | Special Marine Warning | LIX | 91 min | |
| Sep 15, 7:45 AM CDT | Flash Flood Warning | LIX | Washington | 3 hr |
| Sep 15, 7:55 AM CDT | River Flood Warning | LIX | Saint Tammany | 4 days |
| Sep 15, 7:55 AM CDT | River Flood Warning | LIX | Saint Tammany | 49 hr |
| Sep 15, 8:28 AM CDT | Special Marine Warning | LIX | 62 min | |
| Sep 15, 8:37 AM CDT | River Flood Warning | LIX | Tangipahoa | 28 hr |
| Sep 15, 8:50 AM CDT | Special Marine Warning | LIX | 55 min | |
| Sep 15, 8:59 AM CDT | River Flood Warning | LIX | East Baton Rouge | 28 hr |
| Sep 15, 9:02 AM CDT | River Flood Warning | LIX | Saint Tammany | 6 days |
| Sep 15, 9:04 AM CDT | River Flood Warning | LIX | Saint Helena | 4 days |
| Sep 15, 9:08 AM CDT | River Flood Warning | LIX | Saint Tammany, Washington | 5 days |
| Sep 15, 9:08 AM CDT | River Flood Warning | LIX | Saint Tammany | 7 days |
| Sep 15, 9:59 AM CDT | Special Marine Warning | LIX | 61 min | |
| Sep 15, 3:39 PM CDT | River Flood Warning | LIX | Livingston | 42 hr |
| Sep 15, 3:39 PM CDT | River Flood Warning | LIX | Washington | 21 hr |
| Sep 15, 6:13 PM CDT | Areal Flood Advisory | LIX | Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge | 3 hr |
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.