Flash Flood Watch 14, NWS New Orleans, LA

831 
WGUS64 KLIX 061408
FFALIX

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service New Orleans LA
Issued by National Weather Service Mobile AL
908 AM CDT Mon Sep 6 2021

LAZ034>037-046>048-071-MSZ068>071-062215-
/O.EXB.KLIX.FF.A.0014.210906T1408Z-210907T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pointe Coupee-West Feliciana-East Feliciana-St. Helena-Iberville-
West Baton Rouge-East Baton Rouge-Northern Tangipahoa-Wilkinson-
Amite-Pike-Walthall-
Including the cities of Gillsberg, Dolorosa, Dexter, Jackson,
Spillman, Greensburg, Liberty, Port Allen, Tylertown, Plaquemine,
Centreville, Fort Adams, Brusly, Bayou Sorrel, Roseland, Baton
Rouge, Kentwood, New Roads, Salem, Amite, Addis, Lettsworth,
Smithdale, St. Francisville, Felps, Wakefield, Gloster,
Easleyville, Woodville, White Castle, Clinton, McComb,
Montpelier, Livonia, Darlington, and Wilmer
908 AM CDT Mon Sep 6 2021

...FLASH FLOOD WATCH IN EFFECT UNTIL 9 PM CDT THIS EVENING...

The National Weather Service in New Orleans has expanded the

* Flash Flood Watch to include Portions of southeast Louisiana, 
  including the following parishes, East Baton Rouge, East 
  Feliciana, Iberville, Northern Tangipahoa, Pointe Coupee, St. 
  Helena, West Baton Rouge and West Feliciana. Portions of southern 
  Mississippi, including the following areas, Amite, Pike, Walthall 
  and Wilkinson.

* Until 9 PM CDT this evening.

* Numerous slow moving showers and thunderstorms will develop across 
  the area today. The heaviest of these showers and storms will be 
  capable of producing 2 to 3 inches of rain in a short period of 
  time. Locally higher amounts are possible. Soil conditions are 
  saturated or nearly saturated and heavy rainfall may quickly lead 
  to flash flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action 
should Flash Flood Warnings be issued.

&&

$$

LAZ039-049-050-056>061-063>066-072-075>078-MSZ077-080-081-062215-
/O.EXT.KLIX.FF.A.0014.210906T1408Z-210907T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington-Ascension-Livingston-Assumption-St. James-St. John The
Baptist-Upper Lafourche-St. Charles-Upper Jefferson-Upper
Plaquemines-Upper St. Bernard-Upper Terrebonne-Lower Terrebonne-
Southern Tangipahoa-Northwest St. Tammany-Southeast St. Tammany-
Western Orleans-Eastern Orleans-Pearl River-Hancock-Harrison-
Including the cities of Cocodrie, Donaldsonville, Gulfport,
Lutcher, Convent, Gonzales, Robert, Bogalusa, Chalmette, Larose,
Poplarville, Belle Chasse, Destrehan, East New Orleans, Gramercy,
Bayou Cane, Hammond, Metairie, Pierre Part, Watson, Houma,
Franklinton, Picayune, Paincourtville, Reserve, Kenner, Chauvin,
Diamondhead, Ponchatoula, Raceland, Enon, Crossroads, Slidell,
Waveland, Norco, Walker, Labadieville, Laplace, Thibodaux, Bay
St. Louis, Lacombe, Mandeville, McNeil, Prairieville, Denham
Springs, Covington, New Orleans, Montegut, Violet, and Dulac
908 AM CDT Mon Sep 6 2021

...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 9 PM CDT THIS EVENING...

The Flash Flood Watch is now in effect for

* Portions of southeast Louisiana, including the following parishes, 
  Ascension, Assumption, Eastern Orleans, Livingston, Lower 
  Terrebonne, Northwest St. Tammany, Southeast St. Tammany, Southern 
  Tangipahoa, St. Charles, St. James, St. John The Baptist, Upper 
  Jefferson, Upper Lafourche, Upper Plaquemines, Upper St. Bernard, 
  Upper Terrebonne, Washington and Western Orleans. Portions of 
  Mississippi, including the following areas, Hancock, Harrison and 
  Pearl River.

* Until 9 PM CDT this evening.

* Numerous slow moving showers and thunderstorms will develop across 
  the area today. The heaviest of these showers and storms will be 
  capable of producing 2 to 3 inches of rain in a short period of 
  time. Locally higher amounts are possible. Soil conditions are 
  saturated or nearly saturated and heavy rainfall may quickly lead 
  to flash flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action 
should Flash Flood Warnings be issued.

&&

$$

21/CLL

919 
WGUS64 KLIX 062121
FFALIX

Flood Watch
National Weather Service New Orleans LA
Issued by National Weather Service Mobile AL
421 PM CDT Mon Sep 6 2021

LAZ034>037-039-046>050-056>061-063>066-071-072-075>078-MSZ068>071-
077-080-081-070200-
/O.CON.KLIX.FF.A.0014.000000T0000Z-210907T0200Z/
/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-Northern Tangipahoa-Southern
Tangipahoa-Northwest St. Tammany-Southeast St. Tammany-Western
Orleans-Eastern Orleans-Wilkinson-Amite-Pike-Walthall-Pearl River-
Hancock-Harrison-
Including the cities of Convent, Gonzales, Dexter, Chalmette,
Covington, Belle Chasse, White Castle, East New Orleans,
Gramercy, Bayou Cane, Amite, Raceland, Wakefield, Gloster,
Waveland, Easleyville, McComb, McNeil, Montpelier, Livonia,
Darlington, Gillsberg, Gulfport, Jackson, Spillman, Greensburg,
Liberty, Port Allen, Diamondhead, Roseland, Hammond, Metairie,
Salem, Kenner, Chauvin, St. Francisville, Enon, Labadieville,
Dulac, Thibodaux, Clinton, Mandeville, Prairieville, Violet,
Dolorosa, Donaldsonville, Lutcher, Robert, Bogalusa, Larose,
Poplarville, Tylertown, Centreville, Destrehan, Baton Rouge, New
Roads, Lettsworth, Picayune, Paincourtville, Franklinton,
Slidell, Walker, Felps, Laplace, Woodville, Denham Springs, New
Orleans, Montegut, Wilmer, Cocodrie, Lacombe, Plaquemine, Fort
Adams, Brusly, Bayou Sorrel, Kentwood, Pierre Part, Watson,
Houma, Addis, Smithdale, Ponchatoula, Crossroads, Norco, Reserve,
and Bay St. Louis
421 PM CDT Mon Sep 6 2021

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING...

The Flash Flood Watch continues for

* Portions of southeast Louisiana, including the following parishes, 
  Ascension, Assumption, East Baton Rouge, East Feliciana, Eastern 
  Orleans, Iberville, Livingston, 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. Portions of 
  Mississippi, including the following areas, Amite, Hancock, 
  Harrison, Pearl River, Pike, Walthall and Wilkinson.

* Until 9 PM CDT this evening.

* Additional showers and thunderstorms may re-develop late this 
  afternoon into early this evening. The heaviest of these showers 
  and storms will be capable of producing 2 to 3 inches of rain in a 
  short period of time. Locally higher amounts are possible. Soil 
  conditions are saturated or nearly saturated and heavy rainfall 
  may quickly lead to flash flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action 
should Flash Flood Warnings be issued.

&&

$$

21/CLL

Area Forecast Discussion
National Weather Service New Orleans LA
Issued by National Weather Service Mobile AL
1210 AM CDT Mon Sep 6 2021

.AVIATION...Scattered showers will be approaching northwest TAF
sites tonight but should diminish with time as this convection has
outrun the better forcing aloft.

A cold front will approach from the northwest Monday morning with
increasing chances for showers and thunderstorms. There will be
reductions in vsbys and cigs through the day from northwest to
southeast through the late morning and afternoon. Winds will
remain light southwesterly ahead of the front, only modulated by
convective outflows through the day. The greater convective
coverage should move south of the I-10 corridor Monday evening.
There may be some patchy fog redeveloping in the north by end of
the TAF forecast period. /JLH

&&

.PREV DISCUSSION... /issued by National Weather Service Mobile AL/

.NEAR TERM...The upper level ridge of high pressure centered
along the northern Gulf Coast this evening will continue to move
south and weaken. An upper level trough digging across the
Mississippi Valley and an associated surface cold front will drop
southeast into the forecast area on Monday. Showers and
thunderstorms along the front will begin to impact portions of
south central Louisiana late tonight before outrunning the better
upper level support and diminishing in coverage. Much of the
remainder of the forecast region should remain dry overnight with
continued warm and humid conditions.

Scattered showers and thunderstorms should redevelop ahead of the
front across interior southeast Louisiana by late morning before
developing further southeast and becoming increasingly numerous in
coverage. Deep tropical moisture should be in place with PWATS
between 2.0" and 2.25". In addition, the middle and upper level
flow should become increasingly aligned with the surface front
which should support slowing of the frontal boundary. Weak
atmospheric winds should allow for slow moving showers and
thunderstorms that may move repeatedly over the same areas and
produce heavy rainfall. There will be the potential for several
inches of rain to fall quickly in some locations as the very
moist conditions should support heavy rainfall rates. The
potential is increasing for heavy rainfall and areas of flash
flooding over locations that have already experienced excessive
rainfall during Hurricane Ida. This will be closely monitored and
a flash flood watch may become necessary.

Prior to the development of storms, temperatures should quickly
warm into the upper 80s to lower 90s, with dewpoints in the middle
70s. This will likely support heat index values ranging between
100 and 105 degrees. The heat advisory will remain in place for
tomorrow, although temperatures will likely be knock back several
degrees later in the day with anticipated storms. Therefore, the
heat advisory may be cancelled by mid afternoon for many
locations.

The frontal boundary will stall across southeast Louisiana through
Tuesday and with building instability again on Tuesday along and
south of the front, expecting additional development of numerous
showers and thunderstorms across southeast Louisiana. Once again,
with deep tropical moisture in place, there will be the continued
potential for heavy rainfall and at least some continued potential
for areas of flash flooding. Temperatures will remain seasonally
warm through the near term along with very humid conditions. /JLH

&&

.MARINE...Light southwesterly flow will continue across the area
ahead of a weak front that will stall across southeast Louisiana
on Monday night. Northwest winds may develop across inland lakes
behind the front briefly before returning back from the south as
the front lifts back to the north on Tuesday. Deep tropical
moisture will spread over the region late tonight and remain in
place through much of the week. Scattered to numerous showers and
thunderstorms can be expected. /JLH

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  70  87  71  87 /  30  50  10  40
BTR  70  87  71  88 /  30  60  20  50
ASD  72  88  72  86 /  40  70  30  70
MSY  75  89  75  87 /  50  80  30  70
GPT  73  88  73  84 /  40  70  30  70
PQL  72  88  72  86 /  40  70  40  80

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Heat Advisory from 10 AM this morning to 6 PM CDT this evening
     for LAZ034>037-039-046>050-056>061-063>072-075>078.

GM...None.
MS...Heat Advisory from 10 AM this morning to 6 PM CDT this evening
     for MSZ077-080>082.

GM...None.
&&