507
FXUS66 KLOX 281024
AFDLOX

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
324 AM PDT Tue Apr 28 2026

.SYNOPSIS...27/1143 PM.

Quiet weather with near seasonal temperatures will prevail this
week. Breezy west to northwest winds will occur across portions of
the area at times. Isolated showers will be possible over the
interior and mountains Wednesday afternoon and evening.

&&

.SHORT TERM (TDY-THU)...28/1222 AM.

A pretty pleasant 3 day stretch of weather is on tap for Srn CA.
Slightly cyclonic westerly flow will be over the area today along
with 571 dam hgts. There will be very weak (.5 to 1mb) offshore
flow in the morning barely enough to create any canyon winds.
Skies will be mostly sunny. More sunshine and the weak offshore
flow will bring 3 to 6 degrees of warming to most of the
csts/vlys. The interior will not have ydy`s cool air inrush and
this will allow for 7 to 10 degrees of warming. Even with this
warming most areas will still have slightly blo normal temps.

The earlier forecast of weak upper low on Wednesday has not panned
out and now the area will be under a col area between a large trof
over the Great Basin and an upper well to the SW of Pt Conception.
There will be enough of an onshore push to bring low clouds to the
LA south coast and the SBA county west coast in the morning. A few
more degrees of warming is forecast although the stronger onshore
push in the afternoon might result in less warming across the csts
and lower vlys.

The upper low to the SW will sweep harmlessly to the SE and pass
south of San Diego. The SLO to LA area will see rising hgts and
weak offshore flow. The offshore flow will likely not be enough to
prevent low clouds from developing across LA south coast and the
SBA county west coast in the early morning. Max temps will respond
nicely with 1 to 3 degrees of warming across the csts vlys (xcp
for the Central Cst where the sea breeze will cool the area by a
degree or two). The far interior will warm by 4 to 6 degrees.

There will be gusty winds across the Antelope Vly, the I-5
corridor and the western portion of the SBA south coast each late
afternoon and evening strongest Thursday night.

.LONG TERM (FRI-MON)...28/226 AM.

Weak ridging with ~575 dam hgts will dominate the weather on
Friday and Saturday. There will be moderate onshore flow. The
onshore flow could a. lead to some night through morning low
clouds and fog across the csts and lower vlys and b. Limit the
amount of warming created by the ridge esp along the csts. Look
for 2 to 4 degrees of warming on Friday with little change on
Saturday. Max temps everywhere, save for the beaches, will end up
2 to 4 degrees above normal.

There is much better agreement this morning between the mdls
(deterministic, AI and ensemble) for the Sunday and early next
week forecast.

A very large (for May) 558 dam upper low will move south about 100
miles west of the Bay Area on Sunday. SW flow will set up over the
area. It will be dry, but there will be plenty of mid and high
clouds and likely a grip of morning low clouds. Max temps will
cool 3 to 6 degrees.

The low will move to the east starting Sunday night. It will bring
a chance of rain to the area Monday and/or Tuesday. Right now
amounts do not look like they will be too great. Max temps will
nose dive 4 to 8 locally 10 degrees and will end up only in the
mid 60s to lower 70s across the csts/vlys or 3 to 6 locally 8
degrees blo normal.

&&

.AVIATION...28/0928Z.

At 0832Z at KLAX, there was no marine layer nor an inversion.

Overall high confidence in the TAFs, except moderate confidence in
KPRB where there is a 30% chance of IFR cigs 13Z-16Z.

KLAX...High confidence in TAF through 29/09Z then lower confidence
with timing of low cloud arrival with a 30 percent of no low
clouds. No significant east wind component is expected.

KBUR...High confidence in CAVU TAF.

&&

.MARINE...28/205 AM.

Moderate confidence in low-end Small Craft Advisory (SCA) W-NW winds
this afternoon and toight. Moderate to high confidence in SCA
winds expanding to the nearshore and outer waters off the Central
Coast Wednesday and Thursday and possibly into Friday. Moderate
confidence that conds will remain near but below SCA levels over
the weekend.

For the Santa Barbara Channel, SCA winds are possible (30% chance)
each afternoon and evening today and Wednesday over the western
Channel. There is a higher chance of SCA winds Thursday afternoon
and night, followed by lighter winds through the weekend.

Otherwise, typical winds expected elsewhere which includes gusty
(but under SCA winds) nearshore each afternoon.

High confidence in swell remaining rather small through Thursday,
but choppy seas will increase with the winds each afternoon and
night. Thursday night into the week seas will build, potentially
reaching 10 feet over the northern outer waters by Saturday.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.

&&

$$

PUBLIC...Rorke
AVIATION...Rorke
MARINE...RK/CC
SYNOPSIS...Munroe/Ciliberti

weather.gov/losangeles

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

NWS Los Angeles (LOX) Office