Acton, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

252
FXUS66 KLOX 251734
AFDLOX

Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
1034 AM PDT Wed Jun 25 2025

.SYNOPSIS...24/718 PM.

Night and morning low clouds and fog will affect the coast and
some valleys through next Tuesday, otherwise mostly clear skies
are expected across the area with gusty onshore winds each
afternoon. Temperatures will turn a bit warmer through the end of
the week, with little change over the weekend into early next
week.

&&

.SHORT TERM (TDY-FRI)...25/858 AM.

***UPDATE***

No major changes are needed to the forecast this morning. Marine
layer clouds have blanketed the coasts and have pushed into most
of the valleys. Clearing is expected across all valleys through
late this morning. Onshore flow to the E and N today will be
slightly weaker than yesterday, which should result in better
clearing at some beaches. Aside from the aforementioned marine
layer clouds, clear skies are expected today.

As the colder air associated with the trough has exited the
region, many interior areas not under marine layer cloud coverage
have seen a warming trend. Temperatures in the valleys and
foothills are around 5 to 10 degrees warmer, while higher
elevation mountains are up about 10 to 15 degrees compared to
yesterday.

Typical gusty SW-W winds across the Antelope Valley and foothills
will occur this afternoon and evening, along with NW-W winds
along the I-5 corridor tonight. Far southwestern Santa Barbara
County will also see gusty NW-N winds this afternoon into the
evening.

***From Previous Discussion***

The marine layer is 2200 ft deep at KLAX and the onshore push is 4
mb to the east and 2 mb to the north. Marine layer stratus has
been slowly pushing over the area and by dawn most of the
csts/vlys will be overcast (save for the the Santa Clarita Vly).
Clearing should be pretty decent today with lingering clouds only
across the western beaches of VTA and SBA counties. Slight hgt
rises due to the exiting trof and better clearing will bring 2 or
3 degrees of warming to the csts and 3 to 6 degrees for the vlys.
The far interior will see the greatest warming of 8 to 12 degrees.
Even with this warming most max temps will still come in 3 to 6
degrees under normals.

A building ridge will rise hgts to 588 dam on Thu. This will
smoosh the marine layer down and there will be less vly
penetration. It will also increase the strength of the marine
inversion which will slow the clearing for the csts and make it
more likely that some beaches will see no clearing. Look for 2 to
4 degrees of warming for most of the area away from the near shore
area. a 7 to 8 mb onshore push to the east in the afternoon will
bring the typical gusty W-SW afternoon winds to the Antelope Vly
and its foothills.

Aside from a cool down across SLO county, Friday`s max temps will
rise another 1 to 2 degrees as hgts over LA county reach 590 dam.
Otherwise, the day will greatly resemble Thursday with a similar
stratus pattern and afternoon winds.

.LONG TERM (SAT-TUE)...25/1214 AM.

Both the GFS and EC agree that the weather will be rather dull for
the xtnd period. At the upper levels an upper level trof will
slowly develop over the east Pacific and then slowly move over the
state. Despite the trof`s advancement hgts over Srn CA will change
little and will hover around 587 dam. At the sfc the pressure
pattern will be quite stagnant with lgt-mdt onshore flow in the
mornings and mdt-stg onshore flow in the afternoon.

It will be hard to tell each day apart from one another. There
will be night through morning low clouds and fog across the csts
and most of the vlys. Temperature will exhibit little to no day to
variation. The beaches will see max temps a few degrees either
side of 70, look for mid 70s to lower 80s across the rest of the
cstl areas, the vlys will see highs mostly in the 80s with a
smattering of 90 or 91 degree readings in the warmest locations,
finally the interior and lower mtn elevations will end up in the
90s with a few 100 or 101 degree highs in the Antelope Vly. These
highs are a few degrees blo normal across the csts and most vlys
and a few degrees above normal.

The strong afternoon onshore push to the west (~8mb) will bring
gusty SW-W winds to many areas, likely strongest in the Antelope
Vly as well as a stronger than normal sea breeze to the csts.

&&

.AVIATION...25/1734Z.

At 1700Z at KLAX, the marine layer was 2300 ft deep. The top of
the inversion was at 3400 ft with a temperature of 21 C.

High confidence in TAFs for desert airfields (KPMD and KWJF).

Moderate confidence in remaining TAFs. Timing of CIG/VSBY
restrictions may be off +/- 2 hours and flight cat minimums
off by one.

KLAX...Moderate confidence in 18Z TAF. Arrival and departure of
CIGs may be off +/- 2 hours, with a 30% chance of IFR CIGs (007-009)
from 03Z - 15Z Thu. No significant wind issues through fcst period.

KBUR...Moderate confidence 18Z in TAF. There is a 20% chance cigs
do not arrive through fcst period.

&&

.MARINE...25/802 AM.

There is a moderate to high chance for SCA level winds (50-80%
chance) across portions of the Outer Waters through Thursday
night, with highest chances in the afternoon and evening hours
Wednesday and Thursday, with lulls likely each morning. Moderate
chances for SCA level winds in the Inner Waters along the Central
Coast Wednesday and Thursday afternoon and evening. The western
portion of the Santa Barbara Channel has a 60% chance of SCA level
winds Today, and a 40% chance tomorrow (Thursday) - during the
afternoon through late evening hours.

Elsewhere and otherwise, relatively benign conditions are
expected through the weekend.

Night to morning patchy dense fog initially focused off of the
Central Coast may become more widespread each day heading towards
the weekend.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement in effect through late tonight for
      zones 349-350-354-362-366. (See LAXCFWLOX).
PZ...Small Craft Advisory in effect until 9 PM PDT this evening
      for zone 645. (See LAXMWWLOX).
     Small Craft Advisory in effect from 3 PM this afternoon to 1
      AM PDT Thursday for zone 650. (See LAXMWWLOX).
     Small Craft Advisory in effect until 3 AM PDT Friday for
      zones 670-673. (See LAXMWWLOX).
     Small Craft Advisory in effect until 3 AM PDT Thursday for
      zone 676. (See LAXMWWLOX).

&&

$$

PUBLIC...Rorke/Lewis
AVIATION...Black
MARINE...Munroe/Lewis/Black
SYNOPSIS...Sirard/Ciliberti

weather.gov/losangeles

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