Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 6, NWS New Orleans, LA

March 24, 2021Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Mar 24, 2021, 3:04 AM CDT for Terrebonne Parish, Louisiana. It was in force for 3 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 24, 2021, 3:04 AM CDT (08:04 UTC)
Expired: Mar 24, 2021, 6:00 AM CDT
In force: 3 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

County Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.1 hours before the alert went out and 121 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 545 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: -336 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

478 
WGUS54 KLIX 240804
FFWLIX
LAC109-241100-
/O.NEW.KLIX.FF.W.0006.210324T0804Z-210324T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
304 AM CDT Wed Mar 24 2021

The National Weather Service in New Orleans has issued a

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

* Until 600 AM CDT.

* At 304 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 5 and 9 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 bayous 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, Bayou Cane, Gray and Dulac.

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.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 2958 9091 2969 9076 2968 9074 2968 9073
      2966 9071 2961 9066 2960 9062 2957 9060
      2956 9057 2954 9057 2953 9056 2941 9072

FLASH FLOOD...RADAR INDICATED

$$

TE

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 23, 7:35 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	5 hr
Mar 23, 9:26 PM CDT	Special Marine Warning	LIX		64 min
Mar 24, 12:39 AM CDT	Special Marine Warning	LIX		2 hr
Mar 24, 12:44 AM CDT	Special Marine Warning	LIX		16 min
Mar 24, 2:10 AM CDT	Special Weather Statement	LIX	Jefferson	65 min
Mar 24, 2:16 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson	14 min
Mar 24, 2:26 AM CDT	Special Weather Statement	LIX	Lafourche, Terrebonne	64 min
Mar 24, 2:40 AM CDT	Special Weather Statement	LIX	Plaquemines	65 min
Mar 24, 2:51 AM CDT	Special Marine Warning	LIX		114 min
Mar 24, 3:59 AM CDT	Special Weather Statement	LIX	Jefferson	61 min
Mar 24, 4:14 AM CDT	Areal Flood Advisory	LIX	Saint Tammany, Washington	3 hr
Mar 24, 4:25 AM CDT	Special Marine Warning	LIX		35 min
Mar 24, 4:36 AM CDT	Special Weather Statement	LIX	Plaquemines	39 min
Mar 24, 4:41 AM CDT	Severe Thunderstorm Warning	LIX	Plaquemines	19 min
Mar 24, 4:59 AM CDT	Special Marine Warning	LIX		2 hr
Mar 24, 2:47 PM CDT	Wind Advisory	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Bernard and 7 more	25 hr
Mar 24, 3:43 PM CDT	Special Weather Statement	LIX	West Feliciana	32 min

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.