634
FXUS66 KLOX 281128
AFDLOX

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
328 AM PST Fri Nov 28 2025

.SYNOPSIS...27/1136 PM.

Dry weather will continue at least through the middle of next
week. A cooling trend will begin today and continue into next
week as an upper low approaches the area. A Chance of rain will
develop towards the middle of next week.

&&

.SHORT TERM (TDY-SUN)...28/257 AM.

Benign weather will continue today. Dry NW flow aloft with 578 dam
hgts. Weak offshore flow this morning will turn onshore this
afternoon. The offshore flow this morning will not be strong
enough to keep the low clouds off of the LA coast, but otherwise
it will be a sunny day. The marine layer is shallow enough (under
600 ft) that dense fog has formed under the low clouds. A dense
fog advisory is in effect through 900am for the Long Beach to KLAX
area. The lower hgts and more importantly the return of onshore
flow in the afternoon will lower max temps across the csts vlys by
8 to 10 degrees. Some interior sections will warm, since cool air
advection from the high deserts will be cut off. Except for the
nearshore area, max temps will remain above normal.

A little ridge will pop up over the area on Saturday. Hgts really
do not change that much. The offshore flow in the morning is even
weaker and its likely that there will be better marine layer
stratus coverage across the immediate coastal areas. Max temps
will fall a few more degrees as the airmass cools.

A weak long wave pos tilt trof will move through the Great Basin
on Sunday. It is dry and there is no chc of rain. It will likely
help the marine layer cloud coverage in the morning. Later in the
afternoon as NW winds aloft set up over the area, gusty sub
advisory NW winds will develop in the mtns and Antelope Vly.
Cooler air moving in with the trof will lower max temps 2 to 4
degrees and cst/vly max temps will end up in the 60s with a
sprinkling of lower 70 degree readings. These max temps are 2 to 4
degrees blo normal.

.LONG TERM (MON-THU)...28/1205 AM.

The usual end result from the passage of an inside slider is a
Santa Ana wind event and Monday will be no exception. All of the
usual Santa Ana parameters are on the low side and do not expect
this one to generate advisory level winds. In fact, the winds will
not be strong enough to chase away the low clouds from the
Central Coast and the LA coast. By afternoon, however, it will be
sunny everywhere. Max temps will warm across the csts/vlys but the
interior will see noticeable cooling as colder air move in from
the NE.

Ensemble based forecasts do not show much marine layer cloudiness
Tuesday morning along with weak offshore flow. A little skeptical
of this forecast and would not be surprised if there will be more
morning low clouds. The weaker offshore flow will bring 2 or 3
degrees of cooling to the csts/vlys, but the shutting off of the
cool air advection across the interior will result in 2 to 3
degrees of warming. Max temps will be close to seasonal norms in
the 60s and lower 70s.

Not much mdl agreement for the Wed/Thu forecast as the mdls
struggle to handle a retrograding trof (GFS) or cut off low (EC).
Mdl consensus (such that it is) gives the best chc of rain to the
LA/VTA county area. Cooler and cloudier on Wed, but Thursday`s
temps really depend on what upper level pattern develops.

&&

.AVIATION...28/1128Z.

At 0505Z at KLAX, the marine layer WAS 500 FT DEEP. The top of
inversion was at 1400 ft with a temperature of 21 C.

High confidence in all TAFs, except for KSMO (A 25 percent chc of
LIFR cig/vis thru 17Z) and KLAX/KLGB (cig/vis will vary and VFR
transition could be off by +/- 90 minutes).

KLAX...Moderate confidence in TAF through 17Z then good
confidence. There is a 20 percent chc low clouds will stay just
south of the airport. There is a 30 percent chc of VFR conds
arriving at 15Z. There is a 20 percent chc of dense fog with RVRs
less than 800ft. Good confidence in any east wind component
remaining below 7kt.

KBUR...High confidence in VFR TAF.

&&

.MARINE...28/207 AM.

A coastal jet is expected to develop early this morning with
Small Craft Advisory level winds and borderline seas across the
northern Outer Waters (PZZ670). These conditions could spread into
PZZ673 at times especially this afternoon and evening. Hazardous
conditions for small craft should last through early Saturday
morning. Then, conditions will struggle to meet SCA criteria even
beyond 30NM from shore through Sunday morning. Chances do increase
Sunday afternoon and evening, but still looks unimpressive and
borderline. For all Inner Waters, conds are expected to remain
below SCA levels through the weekend.

Low to moderate chances for borderline SCA conditions across the
Outer Waters beyond 30NM from shore and low to very low chances
elsewhere across coastal waters Monday through Wednesday.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Dense Fog Advisory in effect until 9 AM PST this morning for
      zones 366-368. (See LAXNPWLOX).
PZ...Small Craft Advisory in effect until 3 AM PST Saturday for
      zone 670. (See LAXMWWLOX).

&&

$$

PUBLIC...Rorke
AVIATION...Rorke
MARINE...Black/CC/KL
SYNOPSIS...MW/CC

weather.gov/losangeles

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