Acton, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

231
FXUS66 KLOX 070835
AFDLOX

Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
135 AM PDT Mon Apr 7 2025

.SYNOPSIS...06/1142 PM.

Dry weather is expected across Southwest California through next
Saturday. It will be cooler today with a little morning marine
layer. A gradual warming trend will start Tuesday and continue
through Thursday. Well above normal temperatures are likely
Wednesday and Thursday with highs in the mid 80s to low 90s across
the valleys. It will turn cooler Friday and Saturday as onshore
flow increases.

&&

.SHORT TERM (MON-THU)...06/845 PM.

***UPDATE***

Sunny skies prevailed across Southwest California today, with
high temperatures in the 70s to mid 80s. Winds are onshore across
LA and Ventura Counties this evening, with gusts generally 25 to
35 mph through the interior passes and canyons into the Antelope
Valley. Meanwhile, moderate northerly winds are affecting
Southwestern Santa Barbara County, with gusts 25 to 35 mph from
San Marcos Pass to Gaviota.

On the large scale, a sharp ridge of high pressure aloft will be
pushed to the east as a trough moves over the Pacific Northwest.
This will effectively lower heights over the area with a few
degrees of cooling over the coast and valleys on Monday. This
ridge aloft will begin to rebuild on Tuesday, resulting in a few
degrees of warming, followed by more significant warming Wednesday
into Thursday.

Coastal areas are likely to see low clouds, mainly over the
Central Coast and LA Basin late tonight into Monday morning, and
again Monday night into early Tuesday. Northerly winds are
expected to continue each evening to overnight period over SW
Santa Barbara County.

***From Previous Discussion***

Forecast-wise for the short term, no significant issues are
expected. With the upper level ridge weakening and easterly
onshore gradients increasing through Tuesday, there will be some
increase in low clouds/fog across the coastal plain, especially
across the Central Coast. Inversion will remain rather shallow,
so there could be some locally dense fog with any stratus
development. By Wednesday morning, H5 heights will be on the
increase as ridge strengthens and should greatly limit any
potential stratus/fog. Other than the potential stratus/fog
issues, skies are expected to remain mostly clear through
Wednesday.

As for temperatures, will expect some cooling for all areas on
Monday with increasing onshore gradients and lowering thicknesses.
Tuesday, will expect near persistence temperatures across the
coastal plain and a couple degrees of warming across interior
areas. On Wednesday, all areas will warm up noticeably with areas
away from the coast climbing into the 80s to lower 90s.

.LONG TERM (FRI-MON)...07/1209 AM.

Not much excitement on tap for the xtnd period. There is good mdl
agreement for Wed and Thu, but then the mdls and ensembles diverge
for the weekend fcst. Wednesday`s ridge will continue on Thursday
and will then begin to move to the east on Friday. A trof will
approach the state early Saturday. The GFS is more progressive
with the system moving it though the area by Sunday. The EC on the
other hand stalls the system to the west and actually develops a
small pop up ridge. At the sfc there is better agreement with weak
to moderate diurnal onshore pattern in the E/W direction and a
weak offshore to neutral diurnal pattern in the N/S direction.

It will be dry through the period. Marine layer clouds should be
absent on Thursday, but will increase in coverage Friday through
Sunday esp across the Central Coast and the LA cst. Asides from
the low clouds skies will be mostly clear to partly cloudy through
Sunday.

Thursday should be the warmest day for all of the area except for
the Central Coast where an earlier sea breeze will cool temps by 2
to 3 degrees. Max temps will end up 12 to 15 degrees above normal.
This very warm day will be followed by 3 days of cooling as hgts
fall and the onshore push to the west increases. There is some
uncertainty about how much cooling there will be depending if the
cooler GFS or warmer EC comes closest to verifying. Saturday looks
like it will have the biggest cool down regardless of mdl choice.
By sunday most of the csts and lower vlys will be close to or
even under normals while the interior will remain several degrees
above normal.

&&

.AVIATION...07/0828Z.

At 0733Z at KLAX, the marine inversion top was around 1600 ft and
a temp of 18 deg C.

High confidence in TAFs for KPRB, KBUR, KVNY, KPMD, and KWJF.

Low to moderate confidence in remaining TAFS. There is a 40% chance
for VFR conds to prevail at sites with low clouds forecast and a
40% chance of LIFR/IFR conds at sites with VFR conds forecast
through 18Z. If stratus arrives, low confidence in minimum flight
cat, but LIFR conds are most likely, with local VLIFR vsbys
possible at all sites.

KLAX...Low confidence in TAF. There is a 40% chance VFR conds
prevail through the period. If stratus arrives, there is a 30%
chance for vsbys of 1/2SM or lower or cigs VV001 between 10Z and
16Z. High confidence in any east wind component remaining below 8
kts.

KBUR...High confidence in TAF.

&&

.MARINE...06/845 PM.

For the Outer Waters, moderate confidence in current forecast.
This evening through Friday night, there is a 50%-80% chance for
a combination of Small Craft Advisory (SCA) level winds and seas.
However, for PZZ670 (north of Point Sal), SCA level winds will
likely be most widespread starting Tuesday afternoon, but seas are
expected to be at or near SCA levels beginning late tonight. A
lull in the winds is possible Thursday morning for most of the
Outer Waters before ramping back up. There is also a 20% chance of
localized Gale Force wind gusts around the Northern Channel
Islands down to San Nicolas Island Tuesday during the
afternoon/evening hours, with higher chances Friday afternoon and
evening.

For the Inner Waters north of Point Sal, moderate to high
confidence in current forecast. Winds will approach SCA level
Monday afternoon and remain through the evening.Then, from Tuesday
afternoon through Friday night, there is a 40%-60% chance of SCA
winds during the afternoon and evening hours each day, and a
30-40% chance of SCA level seas near 10 feet through Wednesday
morning.

For the Inner Waters south of Point Conception, moderate
confidence in current forecast. There is a 50%-70% chance of SCA
level W to NW winds in western/southern portions of the Santa
Barbara Channel during the afternoon and evening hours through
Friday. Otherwise, conds are expected to be below SCA levels thru
the period.

&&

.BEACHES...07/1243 AM.

A moderate to long period west-northwest swell will bring
high surf conditions to portions of Southwest California this
evening through late Monday night. Peak surf heights will be 4 to
7 feet in Ventura County, and 7 to 11 feet along the Central
Coast. The highest surf will be on west and northwest facing
beaches.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...High Surf Advisory in effect until 3 AM PDT Tuesday for zones
      340-346-354. (See LAXCFWLOX).
PZ...Small Craft Advisory in effect from 3 PM this afternoon to 9
      PM PDT this evening for zone 645. (See LAXMWWLOX).
     Small Craft Advisory in effect until 3 AM PDT early this
      morning for zone 650. (See LAXMWWLOX).
     Small Craft Advisory in effect until 3 AM PDT Wednesday for
      zones 670-673-676. (See LAXMWWLOX).

&&

$$

PUBLIC...Thompson/Smith
AVIATION...Lund
MARINE...Sirard/Lewis
BEACHES...Black/Sirard
SYNOPSIS...Sirard/Smith

weather.gov/losangeles

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