Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 5, NWS New Orleans, LA

March 23, 2021Lafourche Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Mar 23, 2021, 4:05 PM CDT for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 9 hr. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 23, 2021, 4:05 PM CDT (21:05 UTC)
Expired: Mar 24, 2021, 1:15 AM CDT
In force: 9 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties Lafourche Parish, LA, Terrebonne Parish, LA

What was reported inside it

Time	Report	Where	Remark
Mar 23, 8:28 PM CDT	HEAVY RAIN 2.31	1 Nw Mathews, LA	MESONET STATION DW1103 RACELAND. THE PERIOD OF THE HEAVY RAIN EVENT WAS 3 HOURS.
Mar 23, 8:31 PM CDT	FLASH FLOOD	Houma, LA	HEAVY RAIN CAUSING FLASH FLOODING. RAINFALL OF 6-7 ESTIMATED. MULTIPLE STRUCTURES WITH WATER IN THE BUILDINGS AND MULTIPLE ROADS WITH WATER ACROSS THEM AT THIS TIME.
Mar 23, 8:33 PM CDT	HEAVY RAIN 2.57	4 Ese Houma, LA	MESONET STATION EW3858 HOUMA. THE PERIOD OF THE HEAVY RAIN EVENT WAS 3 HOURS.
Mar 23, 9:18 PM CDT	HEAVY RAIN 10.13	4 Ese Houma, LA	MESONET STATION EW3858 HOUMA. THE PERIOD OF THE HEAVY RAIN EVENT WAS 24 HOURS.
Mar 23, 9:19 PM CDT	HEAVY RAIN 8.68	1 Nw Mathews, LA	MESONET STATION DW1103 RACELAND. THE PERIOD OF THE HEAVY RAIN EVENT WAS 24 HOURS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.1 hours before the alert went out and 105 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 13 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 759 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

792 
WGUS54 KLIX 232105
FFWLIX
LAC057-109-240015-
/O.NEW.KLIX.FF.W.0005.210323T2105Z-210324T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
405 PM CDT Tue Mar 23 2021

The National Weather Service in New Orleans has issued a

* Flash Flood Warning for...
  Northwestern Lafourche Parish in southeastern Louisiana...
  Northeastern Terrebonne Parish in southeastern Louisiana...

* Until 715 PM CDT.

* At 405 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 5 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Houma, Thibodaux, Larose, Lockport, Raceland, Mathews, Bayou Cane, 
  Gray, Schriever, Des Allemands and Bayou Gauche.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 2982 9088 2980 9046 2979 9046 2979 9045
      2958 9034 2954 9086

FLASH FLOOD...RADAR INDICATED

$$

MW

3 follow-up statements

771 
WGUS54 KLIX 240012
FFWLIX
LAC057-109-240215-
/O.EXT.KLIX.FF.W.0005.000000T0000Z-210324T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
712 PM CDT Tue Mar 23 2021

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  Northwestern Lafourche Parish in southeastern Louisiana...
  Northeastern Terrebonne Parish in southeastern Louisiana...

* Until 915 PM CDT.

* At 712 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 4 and 8 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Houma, Thibodaux, Larose, Lockport, Raceland, Mathews, Bayou Cane, 
  Gray, Schriever, Des Allemands and Bayou Gauche.

Additional rainfall amounts of 1 to 3 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 2982 9088 2980 9046 2979 9046 2979 9045
      2958 9034 2954 9086

FLASH FLOOD...RADAR INDICATED

$$

958 
WGUS54 KLIX 240208
FFWLIX
LAC057-109-240415-
/O.EXT.KLIX.FF.W.0005.000000T0000Z-210324T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
908 PM CDT Tue Mar 23 2021

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  Northwestern Lafourche Parish in southeastern Louisiana...
  Northeastern Terrebonne Parish in southeastern Louisiana...

* Until 1115 PM CDT.

* At 908 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 4 and 8 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Houma, Thibodaux, Larose, Lockport, Raceland, Mathews, Bayou Cane, 
  Gray, Schriever, Des Allemands and Bayou Gauche.

Additional rainfall amounts of 1 to 3 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 2982 9088 2980 9046 2979 9046 2979 9045
      2958 9034 2954 9086

FLASH FLOOD...RADAR INDICATED

$$

952 
WGUS54 KLIX 240410
FFWLIX
LAC057-109-240615-
/O.EXT.KLIX.FF.W.0005.000000T0000Z-210324T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
1110 PM CDT Tue Mar 23 2021

The National Weather Service in New Orleans has extended the

* Flash Flood Warning for...
  Northwestern Lafourche Parish in southeastern Louisiana...
  Northeastern Terrebonne Parish in southeastern Louisiana...

* Until 115 AM CDT.

* At 1110 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 4 and 8 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Houma, Thibodaux, Larose, Lockport, Raceland, Mathews, Bayou Cane, 
  Gray, Schriever, Des Allemands and Bayou Gauche.

Additional rainfall amounts of 1 to 3 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 2982 9088 2980 9046 2979 9046 2979 9045
      2958 9034 2954 9086

FLASH FLOOD...RADAR INDICATED

$$

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 23, 3:57 AM CDT	Wind Advisory	LIX	Saint Bernard, Saint John the Baptist	11 hr
Mar 23, 6:24 AM CDT	Special Weather Statement	LIX	Pointe Coupee, West Feliciana	66 min
Mar 23, 6:40 AM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	35 min
Mar 23, 7:09 AM CDT	Severe Thunderstorm Warning	LIX	East Feliciana, Pointe Coupee, West Feliciana	51 min
Mar 23, 7:47 AM CDT	Severe Thunderstorm Warning	LIX	East Feliciana, West Feliciana	43 min
Mar 23, 8:00 AM CDT	Special Weather Statement	LIX	Pointe Coupee	30 min
Mar 23, 8:33 AM CDT	Special Weather Statement	LIX	West Feliciana	27 min
Mar 23, 9:00 AM CDT	Special Weather Statement	LIX	East Feliciana	30 min
Mar 23, 9:11 AM CDT	Special Weather Statement	LIX	Pointe Coupee	34 min
Mar 23, 9:29 AM CDT	Special Weather Statement	LIX	Saint Helena	31 min
Mar 23, 9:42 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Iberville, Livingston, Pointe Coupee, West Baton Rouge	34 min
Mar 23, 10:41 AM CDT	River Flood Warning	LIX	Saint Tammany	65 days
Mar 23, 10:41 AM CDT	River Flood Warning	LIX	Saint Tammany	7 days
Mar 23, 10:51 AM CDT	River Flood Warning	LIX	Saint Helena	62 hr
Mar 23, 10:54 AM CDT	River Flood Warning	LIX	Tangipahoa	6 days
Mar 23, 10:57 AM CDT	River Flood Warning	LIX	Saint Tammany	4 days
Mar 23, 11:01 AM CDT	River Flood Warning	LIX	Saint Tammany	4 days
Mar 23, 11:22 AM CDT	Special Weather Statement	LIX	Assumption	23 min
Mar 23, 11:25 AM CDT	Special Weather Statement	LIX	Saint Tammany	35 min
Mar 23, 11:39 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	51 min
Mar 23, 11:46 AM CDT	River Flood Warning	LIX	East Baton Rouge, West Baton Rouge	35 days
Mar 23, 11:49 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	41 min
Mar 23, 12:06 PM CDT	Special Marine Warning	LIX		54 min
Mar 23, 12:47 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Saint Bernard	3 hr
Mar 23, 12:55 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	3 hr
Mar 23, 1:08 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans	2 hr
Mar 23, 1:18 PM CDT	Flash Flood Warning	LIX	Saint Bernard	2 hr
Mar 23, 1:20 PM CDT	Special Marine Warning	LIX		85 min
Mar 23, 1:48 PM CDT	Areal Flood Advisory	LIX	Jefferson, Saint Charles	3 hr
Mar 23, 2:38 PM CDT	Special Marine Warning	LIX		97 min
Mar 23, 3:25 PM CDT	Areal Flood Advisory	LIX	Lafourche	3 hr
Mar 23, 3:27 PM CDT	Areal Flood Advisory	LIX	Lafourche, Terrebonne	3 hr
Mar 23, 3:38 PM CDT	Areal Flood Advisory	LIX	Lafourche, Terrebonne	3 hr
Mar 23, 4:09 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Saint Bernard	3 hr

Nearby

Flash Flood Warnings in Louisiana, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.