321
FXUS66 KLOX 011109
AFDLOX

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
409 AM PDT Sat Nov 1 2025

Updated Aviation Section

.SYNOPSIS...31/109 PM.

Temperatures will rise slightly this weekend as high pressure
rebuilds before a cooling trend begins Monday. Skies will be
mostly clear through Tuesday except for night through morning low
clouds and fog across the coasts and lower valleys. Dry
conditions are expected through next week except for a chance of
rain Wednesday along the Central Coast.

&&

.SHORT TERM (TDY-MON)...01/259 AM.

Tranquil weather will persist into Monday. At the upper levels a
weak ridge will be overhead today; followed by a high hgt dry
upper low passage Sunday and finally a transition to dry SW flow
on Monday. At the sfc the N/S gradient will vary diurnally from
weak offshore to weak onshore. The E/W gradient will be weak all
through Monday morning increasing to moderate onshore Monday
afternoon. Max temps will rise across most areas today as the
ridge and sunshine combine.

The dry upper low passage should lift the marine layer and
eliminate the threat of dense fog and may bring a little better
vly penetration. Most areas will cool due to the lower hgts but
the coasts may warm a degree or two as there onshore push will be
very weak. The nearshore area will come in a few degrees blo
normal but the vlys will end up 3 to 6 degrees over normal while
the mtns and interior will soar to 8 to 12 degrees above normal.

Last night`s eddy has not redeveloped and as a result there is
much less low cloud penetration and much lower cloud bases. So
low, in fact, that dense fog as developed across much of the
coasts. A dense fog advisory is effect until 900 am for the coasts
from Malibu to Morro Bay as well as the Santa Ynez Vly. The clouds
and fog will end by late morning. Skies, otherwise, will be mostly
sunny.

Lower hgts and the stronger afternoon push to the east will bring
most areas 2 to 4 degrees of cooling on Monday. Look for mostly
sunny skies save for the morning marine layer clouds.

.LONG TERM (TUE-FRI)...01/310 AM.

Tuesday will be a duplicate of Monday with little to no change in
any of the synoptic fields. There may be a a few more degrees of
cooling.

The southern end of a large trof originating in the Gulf of
Alaska will sweep through the state on Wednesday. The tail end of
an embedded cold front will pass through SLO and western SBA
counties. It will bring a 20 to 40 percent chc of rain greatest
across SLO county. Rainfall amounts will be under a quarter inch
and mostly under a tenth with the usual exception of the extreme
NW tip of SLO county which could see more. It will be cloudy
across SLO And SBA counties but VTA and LA counties will likely
see some sunshine with partly to mostly cloudy conditions.
Lowering hgts, better onshore flow and the clouds will all gang up
and lower temps by 3 to 6 degrees. The csts and vlys will end up
with highs only in the upper 60s and 70s.

Gusty north winds set up behind the front and this should chase
the low clouds away. Weak ridging pushes in from the west and hgts
will rise both Thu and Fri. Look for two days of warming with
Friday`s highs in the 70s across the csts and lower to mid 80s in
the vlys.

&&

.AVIATION...01/1107Z.

At 11Z at KLAX, the marine layer was 1000 feet deep. The top of
the inversion was at 3000 ft with a temperature of 23 Celsius.

High confidence in weaker than normal winds at all airports.

High confidence in VFR conditions at KPMD KWJF KPRB into Sunday.
30 percent chance of ceilings by sunrise at KBUR and KVNY. All
other airports currently with LIFR/IFR ceilings and visibility.
Expect some improvement around 15Z, then clearing by 18Z.

Moderate confidence in very similar timing and flight categories
Saturday Night/Sunday morning as last night/this morning.

KLAX...Moderate confidence in forecast. High confidence that any
east wind component will be under 6 knots.

KBUR...30 percent chance of BKN003-006 12-15Z Saturday. Otherwise,
high confidence in forecast.

&&

.MARINE...01/238 AM.

Areas of dense fog with visibility under one mile will be a
concern through at least the weekend.

High confidence in the Small Craft Advisory (SCA) level winds or
seas (10+ feet) off the Central Coast through Monday, peaking and
most expansive tonight. Seas likely lowering significantly Monday
and Tuesday, before building again. Large tides (7+ feet) and
swells (westerly 8-15 feet) will bring a moderate risk of breaking
waves at Morro Bay and Ventura Harbor Entrances Thursday and
Friday, as well as moderate coastal flooding.

Southeast winds will be prevalent south of Point Conception each
morning through at least the weekend.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Dense Fog Advisory in effect until 9 AM PDT this morning for
      zones 340-341-346>350-354-355-362. (See LAXNPWLOX).
     High Surf Advisory in effect from 11 AM this morning to 3 AM
      PDT Tuesday for zones 340-346. (See LAXCFWLOX).
PZ...Small Craft Advisory in effect from 3 PM this afternoon to 3
      AM PDT Monday for zones 645-673-676. (See LAXMWWLOX).
     Small Craft Advisory in effect until 3 AM PDT Monday for zone
      670. (See LAXMWWLOX).

&&

$$

PUBLIC...Rorke
AVIATION...Kittell
MARINE...RK
SYNOPSIS...MW

weather.gov/losangeles

Experimental Graphical Hazardous Weather Outlook at:
https://www.weather.gov/erh/ghwo?wfo=lox