Acton Weather

195
FXUS66 KLOX 270545
AFDLOX

Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
1045 PM PDT Thu Mar 26 2026

.SYNOPSIS...26/528 PM.

Temperatures will remain above normal across all valleys and
interior locations through this weekend. A persistent marine
layer will keep temperatures on the cooler side for coastal areas
south of Point Conception through Friday. A warming trend this
weekend will push temperatures to 10 to 20 degrees above normal.
Cooler conditions are likely early next week with rain likely by
Tuesday.

&&

.SHORT TERM (THU-SUN)...26/820 PM.

Latest satellite and surface observations indicate partly cloudy
skies across the area as high clouds stream overhead. Additionally
there is some stratus/fog offshore between Catalina Island and San
Nicolas Island. Current sounding data indicates marine inversion
around 1000 feet in depth. As for winds, some local northwest to
northeast winds, gusting 20-35 MPH, are observed across the
mountains.

For the short term, models are only indicating minor changes from
day-to-day. Upper level high will remain centered over northern
Mexico/Texas through Sunday. However, it will gradually weaken
with H5 heights slowly decreasing across the area. At the
surface, weak to moderate onshore pressure gradients will continue
to the east with some weak northerly offshore gradients.

Through the weekend, dry conditions are expected. Cirrus clouds
drifting overhead will keep skies partly cloudy through Friday,
but clouds will thin out on Saturday/Sunday. Along the coast,
stratus/fog will continue to be an issue for the coastal plain and
some lower coastal valleys. Stratus coverage looks to be most
robust Friday night/Saturday morning.

As for temperatures, there will be minor day-to-day changes across
the area as marine influence brings a mixed bag of trends. North
of Point Conception, will anticipate some warming on Friday...a
bit of cooling on Saturday then a bit of warming on Sunday. South
of Point Conception, look for some slight cooling on Friday then
slight warming trend Saturday/Sunday. No matter the day-to-day
trend, afternoon high temperatures will remain noticeably above
seasonal normals.

As for winds, no significant issues are expected. The onshore
gradients will generate the typical gusty southwesterly winds
across interior sections during the afternoon and evening hours
through the weekend. The northerly offshore gradients, and the
associated northerly winds, will remain weak through the weekend.
So, no advisory-level winds are expected.

.LONG TERM (MON-THU)...26/820 PM.

For the extended, models continue to indicate an upper level
trough developing over the West Coast. As this pattern develops,
it will bring a very noticeable cooling trend to the area. In
fact, by Wednesday/Thurday, afternoon temperatures will generally
only be about 2-5 degrees above normal. So, a very welcome
reprieve from the heat the last couple of weeks.

More importantly, this pattern will bring the chance of rain to
the area in the Tuesday through Thursday time frame. Due to
uncertainty in the timing of rain in the current models, the POPs
for any 12 hour period Tuesday through Thursday are generally in
the 20-40% range. However, based on the ensembles, there is a high
likelihood of measurable rainfall (70-90%) sometime during the
Tuesday through Thursday time frame. As for amounts, GFS ensembles
are indicating, somewhat surprisingly, higher chances of rainfall
totals greater than 0.50 inches than the ECMWF ensembles. Given
this uncertainty, will not deviate too much from current thinking
of most areas receiving 0.50 inches or less with local amounts up
to around 0.75 inches (mainly across northwest San Luis Obispo
county and the foothills). Overall, based on model trends the last
few days, do not anticipate any significant type of storm.

A quick peek into the Great Beyond, models are not indicating any
chances of rain in the April 3-11 time frame.

&&

.AVIATION...27/0521Z.

At 0504Z at KLAX, there was no marine layer. The top of the
inversion was at 2200 feet with a temperature of 23 C.

High confidence TAFs for KPRB, KPMD, & KWJF.

Low to moderate confidence in remaining TAFs. Timing of CIG/VSBY
restrictions may be off +/- 2 hours. There is a 20% chance of IFR
to LIFR conds at KSMX, KBUR and KVNY overnight. Elsewhere along
the coast south of Pt. Conception, flight conds could be off by a
category, most likely lowering from IFR to LIFR.

KLAX...Low to moderate confidence in the 06Z TAF. Cigs may
scatter and reform at times overnight. CIGs expected to arrive
between 06Z to 08Z but the timing could be delayed by up to 2 hrs.
There is a 20% chance of LIFR conds 10Z-15Z. No significant east
wind component expected.

KBUR...Moderate confidence in the 06Z TAF. 20% chance that Low
CIGs and VSBY form overnight, with conds most likely LIFR to low
IFR.

&&

.MARINE...26/834 PM.

High confidence that Small Craft Advisory (SCA) winds and steep
seas will continue through late tonight for the outer waters down
to the Channel Islands and the nearshore waters along the Central
Coast.

Winds and seas will very likely fall below SCA levels conditions
Friday night through Monday night, but there is a 30-40%  chance
of SCA level winds developing over the outer waters Saturday
afternoon into Sunday.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...Small Craft Advisory in effect until 3 AM PDT Friday for
      zones 645-670-673. (See LAXMWWLOX).

&&

$$

PUBLIC...Thompson
AVIATION...Ciliberti
MARINE...Ciliberti
SYNOPSIS...MW/CC

weather.gov/losangeles

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