Alert archive / Louisiana / Flood Watches in 2021

Flood Watch 2, NWS New Orleans, LA

August 28, 20215 counties in Mississippi; 15 parishes in Louisiana

NWS New Orleans, LA issued this flood watch at Aug 28, 2021, 2:36 AM CDT for 5 counties in Mississippi; 15 parishes in Louisiana. It took effect at Aug 29, 2021, 7:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued
Aug 28, 2021, 2:36 AM CDT (07:36 UTC)
In effect from
Aug 29, 2021, 7:00 AM CDT
Expired
Aug 28, 2021, 2:47 AM CDT
In force
Issued by
NWS New Orleans, LA
Flood severity
None

Counties Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.6 hours before the alert went out and 100 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-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2021-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 83 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2021-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
83 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
709 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted.

694 
WGUS64 KLIX 280736
FFALIX

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service New Orleans LA
236 AM CDT Sat Aug 28 2021

LAZ034>037-039-046>050-056>061-063>072-075>078-MSZ068>071-077-
080>082-281545-
/O.NEW.KLIX.FA.A.0002.210829T1200Z-210831T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pointe Coupee-West Feliciana-East Feliciana-St. Helena-Washington-
Iberville-West Baton Rouge-East Baton Rouge-Ascension-Livingston-
Assumption-St. James-St. John The Baptist-Upper Lafourche-St.
Charles-Upper Jefferson-Upper Plaquemines-Upper St. Bernard-Upper
Terrebonne-Lower Terrebonne-Lower Lafourche-Lower Jefferson-Lower
Plaquemines-Lower St. Bernard-Northern Tangipahoa-Southern
Tangipahoa-Northwest St. Tammany-Southeast St. Tammany-Western
Orleans-Eastern Orleans-Wilkinson-Amite-Pike-Walthall-Pearl River-
Hancock-Harrison-Jackson-
Including the cities of Convent, Gonzales, Dexter, Chalmette, 
Covington, Buras, Cut Off, Belle Chasse, White Castle, East New 
Orleans, Gramercy, Bayou Cane, Amite, Pascagoula, Raceland, 
Wakefield, Gloster, Waveland, Easleyville, McComb, McNeil, 
Montpelier, Livonia, Darlington, Gillsberg, Gulfport, Jackson, 
Spillman, Greensburg, Liberty, Port Allen, Diamondhead, Roseland, 
Hammond, Metairie, Salem, Boothville, Galliano, Chauvin, Kenner, St. 
Francisville, Enon, St. Martin, Clinton, Labadieville, Dulac, 
Thibodaux, Yscloskey, Myrtle Grove, Mandeville, Prairieville, 
Violet, Dolorosa, Donaldsonville, Lutcher, Ocean Springs, Robert, 
Bogalusa, Larose, Poplarville, Tylertown, Centreville, Destrehan, 
Baton Rouge, New Roads, Lettsworth, Picayune, Paincourtville, Pointe 
A La Hache, Bay St. Louis, Leeville, Franklinton, Gautier, Slidell, 
Walker, Felps, Laplace, Woodville, Denham Springs, New Orleans, 
Montegut, Wilmer, Golden Meadow, Cocodrie, Venice, Lacombe, 
Plaquemine, Fort Adams, Brusly, Bayou Sorrel, Kentwood, Pierre Part, 
Watson, Houma, Addis, Smithdale, Moss Point, Ponchatoula, 
Crossroads, Norco, Reserve, Port Sulphur, and Empire
236 AM CDT Sat Aug 28 2021

...FLOOD WATCH IN EFFECT FROM SUNDAY MORNING THROUGH TUESDAY 
MORNING...

The National Weather Service in New Orleans has issued a

* Flood Watch for portions of southeast Louisiana and Mississippi, 
  including the following areas and parishes, in southeast 
  Louisiana, Ascension, Assumption, East Baton Rouge, East 
  Feliciana, Eastern Orleans, Iberville, Livingston, Lower 
  Jefferson, Lower Lafourche, Lower Plaquemines, Lower St. Bernard, 
  Lower Terrebonne, Northern Tangipahoa, Northwest St. Tammany, 
  Pointe Coupee, Southeast St. Tammany, Southern Tangipahoa, St. 
  Charles, St. Helena, St. James, St. John The Baptist, Upper 
  Jefferson, Upper Lafourche, Upper Plaquemines, Upper St. Bernard, 
  Upper Terrebonne, Washington, West Baton Rouge, West Feliciana and 
  Western Orleans. In Mississippi, Amite, Hancock, Harrison, 
  Jackson, Pearl River, Pike, Walthall and Wilkinson.

* From Sunday morning through Tuesday morning.

* Excessive rainfall associated with Hurricane Ida will lead to 
  flash flooding in most areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood 
Warnings. Those living in areas prone to flooding should be prepared 
to take action should flooding develop.

&&

$$

TDB
1 follow-up statement
803 
WGUS64 KLIX 280747
FFALIX

Flood Watch
National Weather Service New Orleans LA
247 AM CDT Sat Aug 28 2021

LAZ034>037-039-046>050-056>061-063>072-075>078-MSZ068>071-077-
080>082-280900-
/O.CAN.KLIX.FA.A.0002.210829T1200Z-210831T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pointe Coupee-West Feliciana-East Feliciana-St. Helena-Washington-
Iberville-West Baton Rouge-East Baton Rouge-Ascension-Livingston-
Assumption-St. James-St. John The Baptist-Upper Lafourche-St.
Charles-Upper Jefferson-Upper Plaquemines-Upper St. Bernard-Upper
Terrebonne-Lower Terrebonne-Lower Lafourche-Lower Jefferson-Lower
Plaquemines-Lower St. Bernard-Northern Tangipahoa-Southern
Tangipahoa-Northwest St. Tammany-Southeast St. Tammany-Western
Orleans-Eastern Orleans-Wilkinson-Amite-Pike-Walthall-Pearl River-
Hancock-Harrison-Jackson-
Including the cities of Convent, Gonzales, Dexter, Chalmette, 
Covington, Buras, Cut Off, Belle Chasse, White Castle, East New 
Orleans, Gramercy, Bayou Cane, Amite, Pascagoula, Raceland, 
Wakefield, Gloster, Waveland, Easleyville, McComb, McNeil, 
Montpelier, Livonia, Darlington, Gillsberg, Gulfport, Jackson, 
Spillman, Greensburg, Liberty, Port Allen, Diamondhead, Roseland, 
Hammond, Metairie, Salem, Boothville, Galliano, Chauvin, Kenner, St. 
Francisville, Enon, St. Martin, Clinton, Labadieville, Dulac, 
Thibodaux, Yscloskey, Myrtle Grove, Mandeville, Prairieville, 
Violet, Dolorosa, Donaldsonville, Lutcher, Ocean Springs, Robert, 
Bogalusa, Larose, Poplarville, Tylertown, Centreville, Destrehan, 
Baton Rouge, New Roads, Lettsworth, Picayune, Paincourtville, Pointe 
A La Hache, Bay St. Louis, Leeville, Franklinton, Gautier, Slidell, 
Walker, Felps, Laplace, Woodville, Denham Springs, New Orleans, 
Montegut, Wilmer, Golden Meadow, Cocodrie, Venice, Lacombe, 
Plaquemine, Fort Adams, Brusly, Bayou Sorrel, Kentwood, Pierre Part, 
Watson, Houma, Addis, Smithdale, Moss Point, Ponchatoula, 
Crossroads, Norco, Reserve, Port Sulphur, and Empire
247 AM CDT Sat Aug 28 2021

...FLOOD WATCH IS CANCELLED...

The Flood Watch for portions of southeast Louisiana and Mississippi, 
including the following areas and parishes, in southeast Louisiana, 
Ascension, Assumption, East Baton Rouge, East Feliciana, Eastern 
Orleans, Iberville, Livingston, Lower Jefferson, Lower Lafourche, 
Lower Plaquemines, Lower St. Bernard, Lower Terrebonne, Northern 
Tangipahoa, Northwest St. Tammany, Pointe Coupee, Southeast St. 
Tammany, Southern Tangipahoa, St. Charles, St. Helena, St. James, 
St. John The Baptist, Upper Jefferson, Upper Lafourche, Upper 
Plaquemines, Upper St. Bernard, Upper Terrebonne, Washington, West 
Baton Rouge, West Feliciana and Western Orleans. In Mississippi, 
Amite, Hancock, Harrison, Jackson, Pearl River, Pike, Walthall and 
Wilkinson has been cancelled.

This Flood Watch will be replaced by a Flash Flood Watch

$$

TDB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 3:13 AM CDTFlash Flood WatchLIXAmite, Pearl River, Pike, Walthall, Wilkinson61 hr
Aug 28, 10:24 AM CDTRiver Flood WarningLIXPike4 days
Aug 28, 11:34 AM CDTRiver Flood WarningLIXPearl River4 days
Aug 28, 11:34 AM CDTRiver Flood WarningLIXPearl River4 days
Aug 28, 10:05 AM CDTRiver Flood WarningLIXEast Baton Rouge, Livingston3 days
Aug 28, 10:05 AM CDTRiver Flood WarningLIXEast Baton Rouge3 days
Aug 28, 10:05 AM CDTRiver Flood WarningLIXSaint Helena4 days
Aug 28, 10:05 AM CDTRiver Flood WarningLIXEast Baton Rouge5 days
Aug 28, 10:05 AM CDTRiver Flood WarningLIXAscension, Livingston3 days
Aug 28, 10:09 AM CDTRiver Flood WarningLIXEast Baton Rouge4 days
Aug 28, 10:24 AM CDTRiver Flood WarningLIXTangipahoa7 days
Aug 28, 10:24 AM CDTRiver Flood WarningLIXTangipahoa5 days
Aug 28, 10:24 AM CDTRiver Flood WarningLIXTangipahoa4 days
Aug 28, 10:24 AM CDTRiver Flood WarningLIXTangipahoa4 days
Aug 28, 10:47 AM CDTRiver Flood WarningLIXSaint Tammany6 days
Aug 28, 10:47 AM CDTRiver Flood WarningLIXSaint Tammany4 days
Aug 28, 10:52 AM CDTRiver Flood WarningLIXSaint Tammany4 days
Aug 28, 10:52 AM CDTRiver Flood WarningLIXSaint Tammany4 days
Aug 28, 11:06 AM CDTRiver Flood WarningLIXSaint Helena4 days
Aug 28, 11:06 AM CDTRiver Flood WarningLIXSaint Helena5 days
Aug 28, 11:06 AM CDTRiver Flood WarningLIXLivingston6 days
Aug 28, 1:40 PM CDTRiver Flood WarningLIXLivingston7 days
Aug 28, 1:40 PM CDTRiver Flood WarningLIXAscension, Livingston7 days

Nearby

Flood Watches in Louisiana, 2021Flood Watches in Mississippi, 2021Every flood watch 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.