Alert archive / Louisiana / Flash Flood Watches in 2021
Flash Flood Watch 4, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood watch at May 1, 2021, 2:46 PM CDT for 15 parishes in Louisiana; 5 counties in Mississippi. It took effect at May 2, 2021, 1:00 AM CDT. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- May 1, 2021, 2:46 PM CDT (19:46 UTC)
- In effect from
- May 2, 2021, 1:00 AM CDT
- Expired
- May 2, 2021, 3:00 PM CDT
- In force
- 14 hr
- 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 12:00Z, 7.8 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1869 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
080 WGUS64 KLIX 011946 FFALIX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service New Orleans LA 246 PM CDT Sat May 1 2021 LAZ034>037-039-046>050-056>058-071-072-075-076-MSZ068>071-077- 080>082-020400- /O.NEW.KLIX.FF.A.0004.210502T0600Z-210503T0600Z/ /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-Northern Tangipahoa- Southern Tangipahoa-Northwest St. Tammany-Southeast St. Tammany- Wilkinson-Amite-Pike-Walthall-Pearl River-Hancock-Harrison-Jackson- Including the cities of Gillsberg, Dolorosa, Donaldsonville, Hammond, Jackson, Spillman, Gonzales, Robert, Bogalusa, Dexter, Liberty, Denham Springs, Lacombe, Covington, Port Allen, Poplarville, Tylertown, Lutcher, Plaquemine, Centreville, Watson, Pascagoula, Fort Adams, Brusly, Bayou Sorrel, Roseland, Gramercy, Amite, Baton Rouge, Lettsworth, Pierre Part, New Roads, Salem, Franklinton, Addis, Paincourtville, Reserve, Ponchatoula, Kentwood, Moss Point, St. Francisville, Greensburg, Felps, Wakefield, Enon, Gloster, Slidell, Picayune, Diamondhead, Easleyville, Gautier, Gulfport, Ocean Springs, Walker, Woodville, Crossroads, Labadieville, Laplace, White Castle, Bay St. Louis, Clinton, McComb, Mandeville, Convent, Prairieville, Montpelier, Waveland, Livonia, Darlington, St. Martin, Wilmer, Smithdale, and McNeil 246 PM CDT Sat May 1 2021 ...FLASH FLOOD WATCH IN EFFECT FROM LATE TONIGHT THROUGH LATE SUNDAY NIGHT... The National Weather Service in New Orleans has issued a * Flash Flood Watch for portions of southeast Louisiana and Mississippi, including the following areas, in southeast Louisiana, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston, Northern Tangipahoa, Northwest St. Tammany, Pointe Coupee, Southeast St. Tammany, Southern Tangipahoa, St. Helena, St. James, St. John The Baptist, Washington, West Baton Rouge and West Feliciana. In Mississippi, Amite, Hancock, Harrison, Jackson, Pearl River, Pike, Walthall and Wilkinson. * From 1 AM CDT Sunday through late Sunday night * Rainfall totals of 1 to 3 inches with locally higher amounts are forecast late tonight through Sunday night. * High rainfall rates could overwhelm drainage capacity. Ponding of water in low lying and poor drainage areas can be expected, with flash flooding possible where the heaviest rain falls. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to Flash Flooding. Flash Flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Be sure to have multiple ways to receive flash flood warnings should they become necessary for your area. And remember, never drive through flooded roadways as the water may be too deep for safe passage. && $$ DM
4 follow-up statements
489 WGUS64 KLIX 020130 FFALIX Flood Watch National Weather Service New Orleans LA 830 PM CDT Sat May 1 2021 LAZ034>037-039-046>050-056>058-071-072-075-076-MSZ068>071-077- 080>082-021030- /O.CON.KLIX.FF.A.0004.210502T0600Z-210503T0600Z/ /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-Northern Tangipahoa- Southern Tangipahoa-Northwest St. Tammany-Southeast St. Tammany- Wilkinson-Amite-Pike-Walthall-Pearl River-Hancock-Harrison-Jackson- Including the cities of Gillsberg, Dolorosa, Donaldsonville, Hammond, Jackson, Spillman, Gonzales, Robert, Bogalusa, Dexter, Liberty, Denham Springs, Lacombe, Covington, Port Allen, Poplarville, Tylertown, Lutcher, Plaquemine, Centreville, Watson, Pascagoula, Fort Adams, Brusly, Bayou Sorrel, Roseland, Gramercy, Amite, Baton Rouge, Lettsworth, Pierre Part, New Roads, Salem, Franklinton, Addis, Paincourtville, Reserve, Ponchatoula, Kentwood, Moss Point, St. Francisville, Greensburg, Felps, Wakefield, Enon, Gloster, Slidell, Picayune, Diamondhead, Easleyville, Gautier, Gulfport, Ocean Springs, Walker, Woodville, Crossroads, Labadieville, Laplace, White Castle, Bay St. Louis, Clinton, McComb, Mandeville, Convent, Prairieville, Montpelier, Waveland, Livonia, Darlington, St. Martin, Wilmer, Smithdale, and McNeil 830 PM CDT Sat May 1 2021 ...FLASH FLOOD WATCH IN EFFECT FROM LATE TONIGHT THROUGH LATE SUNDAY NIGHT... The Flash Flood Watch continues for * Portions of southeast Louisiana and Mississippi, including the following areas, in southeast Louisiana, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston, Northern Tangipahoa, Northwest St. Tammany, Pointe Coupee, Southeast St. Tammany, Southern Tangipahoa, St. Helena, St. James, St. John The Baptist, Washington, West Baton Rouge and West Feliciana. In Mississippi, Amite, Hancock, Harrison, Jackson, Pearl River, Pike, Walthall and Wilkinson. * From 1 AM CDT Sunday through late Sunday night * Rainfall totals of 1 to 3 inches with locally higher amounts are forecast late tonight through Sunday night. * High rainfall rates could overwhelm drainage capacity. Ponding of water in low lying and poor drainage areas can be expected, with flash flooding possible where the heaviest rain falls. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to Flash Flooding. Flash Flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Be sure to have multiple ways to receive flash flood warnings should they become necessary for your area. And remember, never drive through flooded roadways as the water may be too deep for safe passage. && $$ PG
162 WGUS64 KLIX 020829 FFALIX Flood Watch National Weather Service New Orleans LA 329 AM CDT Sun May 2 2021 LAZ059>061-063>070-077-078-022030- /O.EXA.KLIX.FF.A.0004.000000T0000Z-210503T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Upper Lafourche-St. Charles-Upper Jefferson-Upper Plaquemines-Upper St. Bernard-Upper Terrebonne-Lower Terrebonne-Lower Lafourche-Lower Jefferson-Lower Plaquemines-Lower St. Bernard-Western Orleans- Eastern Orleans- Including the cities of Cocodrie, Venice, Chalmette, Larose, Galliano, Buras, Golden Meadow, Cut Off, Belle Chasse, Destrehan, East New Orleans, Bayou Cane, Metairie, Houma, Thibodaux, Boothville, Leeville, Kenner, Chauvin, Raceland, Norco, Empire, Pointe A La Hache, Port Sulphur, Yscloskey, Myrtle Grove, New Orleans, Montegut, Violet, and Dulac 329 AM CDT Sun May 2 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... The National Weather Service in New Orleans has expanded the * Flash Flood Watch to include a portion of southeast Louisiana, including the following areas, Eastern Orleans, Lower Jefferson, Lower Lafourche, Lower Plaquemines, Lower St. Bernard, Lower Terrebonne, St. Charles, Upper Jefferson, Upper Lafourche, Upper Plaquemines, Upper St. Bernard, Upper Terrebonne and Western Orleans. * Through late tonight * Rainfall totals of 1 to 3 inches with locally higher amounts are forecast through tonight. $$ LAZ034>037-039-046>050-056>058-071-072-075-076-MSZ068>071-077- 080>082-022030- /O.CON.KLIX.FF.A.0004.000000T0000Z-210503T0600Z/ /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-Northern Tangipahoa- Southern Tangipahoa-Northwest St. Tammany-Southeast St. Tammany- Wilkinson-Amite-Pike-Walthall-Pearl River-Hancock-Harrison-Jackson- Including the cities of Gillsberg, Dolorosa, Donaldsonville, Hammond, Jackson, Spillman, Gonzales, Robert, Bogalusa, Dexter, Liberty, Denham Springs, Lacombe, Covington, Port Allen, Poplarville, Tylertown, Lutcher, Plaquemine, Centreville, Watson, Pascagoula, Fort Adams, Brusly, Bayou Sorrel, Roseland, Gramercy, Amite, Baton Rouge, Lettsworth, Pierre Part, New Roads, Salem, Franklinton, Addis, Paincourtville, Reserve, Ponchatoula, Kentwood, Moss Point, St. Francisville, Greensburg, Felps, Wakefield, Enon, Gloster, Slidell, Picayune, Diamondhead, Easleyville, Gautier, Gulfport, Ocean Springs, Walker, Woodville, Crossroads, Labadieville, Laplace, White Castle, Bay St. Louis, Clinton, McComb, Mandeville, Convent, Prairieville, Montpelier, Waveland, Livonia, Darlington, St. Martin, Wilmer, Smithdale, and McNeil 329 AM CDT Sun May 2 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of southeast Louisiana and Mississippi, including the following areas, in southeast Louisiana, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston, Northern Tangipahoa, Northwest St. Tammany, Pointe Coupee, Southeast St. Tammany, Southern Tangipahoa, St. Helena, St. James, St. John The Baptist, Washington, West Baton Rouge and West Feliciana. In Mississippi, Amite, Hancock, Harrison, Jackson, Pearl River, Pike, Walthall and Wilkinson. * Through late tonight * Rainfall totals of 1 to 3 inches with locally higher amounts are forecast through tonight. $$ CAB
039 WGUS64 KLIX 021500 FFALIX Flood Watch National Weather Service New Orleans LA 1000 AM CDT Sun May 2 2021 LAZ034>037-039-046>050-056>061-063>072-075>078-MSZ068>071-077- 080>082-022300- /O.CON.KLIX.FF.A.0004.000000T0000Z-210503T0600Z/ /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 1000 AM CDT Sun May 2 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of southeast Louisiana and Mississippi, including the following areas, 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. * Through late tonight * Rainfall totals of 1 to 3 inches with locally higher amounts are forecast through tonight. * High rainfall rates could overwhelm drainage capacity. Ponding of water in low lying and poor drainage areas can be expected, with flash flooding possible where the heaviest rain falls. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to Flash Flooding. Flash Flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Be sure to have multiple ways to receive flash flood warnings should they become necessary for your area. And remember, never drive through flooded roadways as the water may be too deep for safe passage. && $$ DM
397 WGUS64 KLIX 022000 FFALIX Flood Watch National Weather Service New Orleans LA 300 PM CDT Sun May 2 2021 LAZ034>037-039-046>050-056>061-063>072-075>078-MSZ068>071-077- 080>082-022100- /O.CAN.KLIX.FF.A.0004.000000T0000Z-210503T0600Z/ /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 300 PM CDT Sun May 2 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for Southeast Louisiana and Southwest and Coastal Mississippi has been cancelled. While Isolated showers and storms will continue to be possible through tonight, the flash flood threat will be low. $$ DM
Nearby
Flash Flood Watches in Louisiana, 2021Flash Flood Watches in Mississippi, 2021Every flash 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.