[Alert]LIX issues Area Forecast Discussion (AFD) at Nov 17, 1:07 PM CST ...New SHORT TERM, LONG TERM, AVIATION, MARINE...

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LIX issues Area Forecast Discussion (AFD) at Nov 17, 1:07 PM CST ...New SHORT TERM, LONG TERM, AVIATION, MARINE...

316 
FXUS64 KLIX 171907
AFDLIX

Area Forecast Discussion
National Weather Service New Orleans LA
107 PM CST Mon Nov 17 2025

...New SHORT TERM, LONG TERM, AVIATION, MARINE...

.KEY MESSAGES...
Updated at 1218 PM CST Mon Nov 17 2025

- Areas of dense fog will develop in the early morning hours on
  Tuesday, Wednesday, and Thursday.  
 
- Above normal temperatures expected through Saturday.

- A cold front will bring higher rain chances to the area on
  Friday.  

- Hazardous marine conditions due to stronger southerly winds on
  Thursday and Friday.  

&&

.SHORT TERM...
(This evening through Wednesday night)
Issued at 1218 PM CST Mon Nov 17 2025

Very little change in the day to day weather conditions are
expected through the short term period as a broad deep layer ridge
axis continues to dominate the Gulf South. Temperatures will
remain well above average with readings running around 10 degrees
above normal through Wednesday night. The deep layer ridging will
keep a strong mid-level capping inversion in place, and this will
prohibit any rainfall from forming. However, there will continue
to be a persistent light onshore flow regime that will allow for
high humidity values in the low levels. As a result, some
scattered strato-cumulus development can be expected each day.
This strato-cumulus will form as an extensive morning fog bank
mixes out with daytime heating each morning. 

In terms of the fog threat, conditions are extremely favorable 
for widespread fog to form across much of the area in the early 
morning hours tonight, tomorrow night, and Wednesday night. Fog 
probabilities remain very high through the period and confidence 
is also high that more fog will form. These conditions include, 
the upper level ridge over the region, strong radiational cooling,
light winds, and the high low level humidity. The fog will turn 
dense at times, and a dense fog advisory will likely be needed 
again for tomorrow morning over portions of the area. Any burning 
of agricultural fields could produce very isolated areas of 
superfog and near zero visibility each morning as well.

&&

.LONG TERM...
(Thursday through Sunday night) 
Issued at 1218 PM CST Mon Nov 17 2025

The long term model guidance is in remarkably good agreement and
overall ensemble spread is on the lower end as move into the
latter part of the workweek and upcoming weekend. This lends
higher confidence to the overall forecast. Thursday will be a day
of transition with stronger winds developing as the pressure
gradient over the area increases in response to a low pressure
system deepening over the Southern Plains. Southerly winds should
increase to 10 to 15 mph by the afternoon hours. Temperatures will
also remain well above average on Thursday with readings easily
rising into the lower 80s. By Thursday night, there are
indications that weak region of increased upper level forcing will
form beneath an increasingly difluent flow pattern aloft.
Additionally, a plume of deeper moisture will feed into the region
with PWATS rising to around the 90th percentile. With favorable 
forcing parameters in place, some scattered shower activity should
form Thursday night over the area. Fortunately, despite the high 
PWATS, a heavy rainfall signal is not in place due to a lack of 
decent thermodynamic support. Any showers will be light and 
transient in nature through the overnight hours. 

Friday will be the primary rain day as the shortwave energy in the
Southern Plains passes through the Mid-Mississippi Valley. A
trailing trough axis will slide through the area and serve as a
focusing mechanism for showers and a few weak and low topped
thunderstorms throughout the day on Friday. PWATS will remain in
the 90th percentile range for this time of year, so a few brief
heavy downpours could occur with any of these weaker storms that
form. However, the lack of sustained updraft development due to
the limited instability will limit heavy rain potential with most
areas seeing less than an inch of rainfall from the event on 
Friday. Temperatures will remain above average with highs once 
again climbing into the upper 70s and lower 80s as winds remain 
from the south.

Well behind the main trough axis and overall rain event, the
trailing cold front will finally push through Friday night. A few
showers and storms could fire up along the front itself, but the
lack of instability will greatly limit overall convective
development. At the same time, some weak cold air advection will 
take hold behind the front. Lows will remain very mild Friday 
night, but daytime highs will be around 5 degrees cooler on 
Saturday. These values will still be above average, but not quite 
as extreme as the temperatures experienced the past several days. 
Additionally, a surge of drier air aloft will feed into the region
and PWATS will fall back to the normal levels seen for this time 
of year. Further drying in the mid and upper levels is expected by
Sunday as an upper level ridge axis begins to build in from the 
west. PWATS will fall to around the 25th percentile and this will 
allow for mainly clear skies and dry conditions as we close out 
the weekend. Temperatures will also continue to cool as the 
northwest flow regime aloft ushers in somewhat cooler air. 
Temperatures will fall to more normal readings for mid to late 
November with highs in the lower 70s and lows in the upper 40s and
50s. Overall, a fairly pleasant weekend is anticipated once the 
front clears the region. 

&&

.AVIATION...
(18Z TAFS)
Issued at 1218 PM CST Mon Nov 17 2025

Another round of dense fog will be the primary concern as
conditions remain extremely favorable for fog and low stratus to
form at all of the terminals. The fog and stratus will tend to
develop after 06z and linger through 15z before gradually
clearing. Prevailing IFR conditions can be expected when the fog
and stratus is occurring. Before the fog forms and after the fog
clears, prevailing VFR conditions can be expected.  PG

&&

.MARINE...
Issued at 1218 PM CST Mon Nov 17 2025

Through Wednesday, a prevailing light southeast flow of less than
10 knots and seas of less than 2 feet can be expected as the
region remains on the western periphery of a broad surface high
pressure system. By Thursday, the pressure gradient over the Gulf
waters will begin to increase as a low pressure system deepens
over Texas. This low will pass to the north of the area on Friday
and push a weak cold front through the waters. Stronger southerly
winds of at least 15 to 20 knots and potentially up to 25 knots
will impact the open Gulf waters as this system moves through.
Seas will also rise to 5 to 7 feet in response to the stronger 
winds. Fortunately, a strong surge of colder air will not
accompany the front, so winds will weaken back below 15 knots as
they shift to the west and northwest on Saturday.  

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  60  81  60  82 /   0   0   0   0 
BTR  62  83  61  83 /   0   0   0   0 
ASD  59  79  58  80 /   0   0   0   0 
MSY  64  80  63  80 /   0   0   0   0 
GPT  62  75  61  77 /   0   0   0   0 
PQL  58  77  58  78 /   0   0   0   0 

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...None.
MS...None.
GM...None.
&&

$$

SHORT TERM...PG
LONG TERM....PG
AVIATION...PG
MARINE...PG

Source: LIX issues Area Forecast Discussion (AFD) at Nov 17, 1:07 PM CST ...New SHORT TERM, LONG TERM, AVIATION, MARINE...

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