Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 4, NWS New Orleans, LA

March 23, 2021Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Mar 23, 2021, 1:18 PM CDT for Saint Bernard 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: Mar 23, 2021, 1:18 PM CDT (18:18 UTC)
Expired: Mar 23, 2021, 3:35 PM CDT
In force: 2 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

County Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.3 hours before the alert went out and 38 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.

839 
WGUS54 KLIX 231818
FFWLIX
LAC087-232130-
/O.NEW.KLIX.FF.W.0004.210323T1818Z-210323T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in New Orleans has issued a

* Flash Flood Warning for...
  West Central St. Bernard Parish in southeastern Louisiana...

* Until 430 PM CDT.

* At 118 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 2 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...
  New Orleans, Chalmette, Meraux and Arabi.

Additional rainfall amounts up to 1 inch 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 2992 8998 2993 8998 2995 9001 2999 8999
      2999 8998 2999 8997 2998 8995 2998 8994
      3000 8991 3000 8989 2999 8988 2999 8987
      2999 8986 3000 8986 2996 8984 2994 8984
      2994 8983

FLASH FLOOD...RADAR INDICATED

$$

MW

1 follow-up statement

398 
WGUS74 KLIX 232035
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
335 PM CDT Tue Mar 23 2021

LAC087-232045-
/O.CAN.KLIX.FF.W.0004.000000T0000Z-210323T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Bernard LA-
335 PM CDT Tue Mar 23 2021

...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL ST. BERNARD 
PARISH...

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 1200 AM CDT Friday for 
portions of southeast Louisiana and Mississippi.

LAT...LON 2992 8998 2993 8998 2995 9001 2999 8999
      2999 8998 2999 8997 2998 8995 2998 8994
      3000 8991 3000 8989 2999 8988 2999 8987
      2999 8986 3000 8986 2996 8984 2994 8984
      2994 8983

$$

MW

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, 1:20 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, 4:05 PM CDT	Flash Flood Warning	LIX	Lafourche, Terrebonne	9 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; the sounding from the Mesonet's radiosonde archive.