Acton, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

448
FXUS66 KLOX 121208
AFDLOX

Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
508 AM PDT Mon May 12 2025

.SYNOPSIS...12/206 AM.

temperatures today will come crashing down, with gusty coastal
and desert winds in the afternoon and evening. Temperatures will
drop further Tuesday and drizzle will be possible. Cooler
conditions will last through the weekend, with low clouds and fog
pushing back into the valleys.

&&

.SHORT TERM (TDY-WED)...12/306 AM.

Low clouds are trying to get started and currently are only across
southern LA county. There is an eddy, increasing cyclonic flow and
increasing onshore so there will likely be an explosion of low
clouds towards dawn that will cover most of the csts/vlys of
LA/VTA counties. Low clouds will also likely cover western SBA
county. There is about a 30 percent chc that there will not be
quite as much low cloud coverage as the current forecast. Assuming
the low clouds do form they will be slow to clear across the vlys
with no clearing likely for the much of the csts as the onshore
push to the east is forecast to reach an impressive 9 mb this
afternoon. In addition to the low clouds a grip of low clouds will
also move over the area so expect a mostly cloudy day. Lowering
hgts, low clouds and strong onshore flow will all combine to lower
max temps today by 5 to 10 locally 12 degrees across the csts and
10 to 20 degrees over the rest of the area. Today`s highs will
mostly end up in the 60s across the csts and lower to mid 70s in
the vlys or 3 to 6 degrees blo normal. The strong onshore push
will generate gusty winds in the 25 to 40 mph range across many
coastal and interior areas this afternoon and evening. The
Antelope Vly and western foothills will likely see gusts of 40 to
50 mph and a wind advisory will be posted with the evening
update.

A fairly sharp but also quite dry trof will move over the area on
Tuesday. The biggest precipitation threat from the trof will be
drizzle as it interacts with a deep marine layer but there will be
a slight chc of shower over the higher peaks of the LA/VTA mtns.
The marine layer will be lifted to over 4000 ft and stratus will
likely cover all of the csts/vly and will xtnd deep into the mtns
passes. Clear will be slow with many coastal areas remain cloudy
through the day. 2 to 4 degrees of additional cooling (4 to 8
locally 12 across the Antelope Vly and the VTA/LA mtns) will bring
almost all max temps down into the 60s with just a smattering of
readings in the lower 70s. Advisory level gusts are likely again
across the western Antelope Vly.

Much less to talk about for Wednesday. Morning marine layer clouds
will cover much of the csts/vlys, but offshore trends will allow
for much faster and better clearing. More sunshine, rising hgts
and weaker onshore flow will all mix together to bring 3 to 6
degrees of warming to most areas. Max temps, however, will still
come in 2 to 5 degrees blo normal.

.LONG TERM (THU-SUN)...12/314 AM.

Broad pos tilt troffing will be over the area Thursday and Friday.
There will be moderate onshore flow at the sfc. May Grey will
continue with night though morning low clouds, but there should be
good clearing for most of the area (a few west facing beaches may
stay cloudy). The csts/vlys will not see too much temperature
change and will remain 2 to 4 degree blo normal. There will be
better warming across the mtns and far interior Thursday and
little change on Fri.

An upper low is forecast to move into the far northern portion of
the state Sat and then down into Srn CA on Sun. Look for strong
onshore flow to develop with gusty winds across much of the area.
There may be enough cold advection and mixing to disrupt the
marine layer on Sunday.

&&

.AVIATION...12/1207Z.

Around 12Z at KLAX, the marine layer was around 1400 ft deep. The
top of the inversion was at 3600 feet with a temperature of 20 C.

High confidence for TAFs at KPRB, KSBP, KSBA, KWJF and KPMD.

Low confidence in TAFs for KOXR and KCMA with a 40 percent chc of
IFR cigs through 17Z Mon and after 06Z Tues.

Moderate confidence for the rest of the TAFs. Timing of flight cat
changes could be off by +/- 90 minutes. There is a 30% chance of
MVFR conds after 06Z Tues.

KLAX....Moderate confidence in TAF. VFR conds could arrive as
early as 18Z. Any easterly wind component will be less than 7
knots.

KBUR...Moderate confidence in TAF. Low clouds could clear as late
as 1830Z. There is a 30% chance of BKN008 conds as early as 06Z
Tue.

&&

.MARINE...12/503 AM.

For the outer waters, there is moderate to high confidence in the
current forecast. Small Craft Advisory (SCA) winds will persist
for much of the time thru Mid-week. However, winds across the
waters north of Point Sal (zone PZZ670) will likely drop below
advisory levels this morning before increasing once again this
afternoon. There is a 10-20% chance of GALE force winds during the
afternoon and evening hours today and Tuesday, with the highest
chances around the Channel Islands. Short- period, choppy seas
will continue across the outer waters into Wednesday.

For the inner waters N of Point Sal, there is moderate to high
confidence in the current forecast. High confidence in SCA winds
through at least Wednesday evening, especially during the
afternoon/evening hours. Thereafter, there is only a 20-30%
chance of SCA level winds during the afternoon/eve hours for the
remainder of the work week.

For the inner waters S of Point Conception, there is moderate to
high confidence in the current forecast. GALE force wind gusts
are expected at times across portions of the Santa Barbara Channel
this afternoon through late tonight, with a 40% chance of
reoccuring Tuesday afternoon and evening. Thereafter, SCA level
winds are expected for entire SBA channel through Tue, followed by
a 60% chance for western portions Wed afternoon/eve. For
remainder of work week, conds are generally expected to remain
below SCA Criteria.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory remains in effect until 10 AM PDT this morning
      for zones 349-351-352. (See LAXNPWLOX).
     Wind Advisory remains in effect until 9 PM PDT this evening
      for zones 381>383. (See LAXNPWLOX).
PZ...Small Craft Advisory in effect until 3 AM PDT Wednesday for
      zones 645-655-670-673-676. (See LAXMWWLOX).
     Small Craft Advisory in effect until 3 PM PDT this afternoon
      for zone 650. (See LAXMWWLOX).
     Gale Warning in effect from 3 PM this afternoon to 3 AM PDT
      Tuesday for zone 650. (See LAXMWWLOX).

&&

$$

PUBLIC...Rorke
AVIATION...Rorke/Lund
MARINE...Black/Lund
SYNOPSIS...Schoenfeld

weather.gov/losangeles

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