Arroyo Grande, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

605
FXUS66 KLOX 271105
AFDLOX

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
405 AM PDT Fri Jun 27 2025

.SYNOPSIS...27/1204 AM.

Night and morning low clouds and fog will affect the coasts and
some valleys, otherwise mostly clear skies are expected across
the area with gusty onshore winds each afternoon. Temperatures
will change little over the weekend and into early next week.

&&

.SHORT TERM (TDY-SUN)...27/237 AM.

Weak cyclonic flow aloft and an eddy have lifted the marine layer
to about 1300 ft and low clouds have moved into the csts and vlys.
The onshore push to the east will increase from 3 mb this morning
to about 8 mb this afternoon. This will mean another day of slow
clearing with no clearing at some west facing beaches. Slightly
weaker onshore flow to the north will allow for a couple of
degrees of warming for most areas south of Pt Conception while
Central Coast sees little change in temps. Most areas south of Pt
Conception will come in 2 to 4 degrees blo normal while the
Central Coast (with highs mostly in 60s) will end up 4 to 8
degrees under normals.

A little ridge noses in from the SE on Saturday this will smoosh
the marine layer some and will result in less morning marine
clouds in the vlys. The onshore flow will be a little weaker as
well so the low clouds will clear quicker and more completely. Max
temps, as a result, will warm 2 to 4 degrees across the board.

Sunday will be quite similar to Saturday. Onshore flow may be a
little stronger so max temps may cool a degree or two. Look for
mostly 70s across the coasts, 80s in the vlys and upper 80s to mid
90s across the interior and lower mtn elevations.

The moderate onshore push to the east will bring the typical
gusty southwesterly afternoon winds to interior sections (esp the
western Antelope Vly), but speeds will remain below advisory
levels. Additionally, there will be some localized sub advisory
Sundowner winds each evening.

.LONG TERM (MON-THU)...27/1218 AM.

Not much change at all for the xtnd fcst. Both the GFS and EC
agree that a high hgt (582 dam) upper low will develop in the east
pac and then slowly move across the state during the week. This
is a little different than the fcst ydy at this time when the fcst
call for an open trof. Despite the change, this change will not
affect the fcst.

There will be mdt onshore flow in the mornings and stg onshore
flow in the afternoon. This onshore flow pattern coupled with the
cyclonic turning aloft will result persistent night through
morning low cloud pattern. The low clouds will affect almost all
of the csts/vlys and clearing will be on the slow side with some
beaches remaining cloudy all day. Aside from the low clouds skies
will be clear.

Max temps will exhibit little day to day change. Most max temps
will be a few degrees blo normal with the exception for the
Antelope Vly and interior vlys of SLO and SBA counties. Coastal
temps will mostly be in the 70s (a little cooler for the Central
Coast) and the vlys will be in the 80s.

With continued strong afternoon onshore pressure gradients, gusty
southwesterly winds can be expected each afternoon/evening across
interior sections. However, speeds should remain below advisory
levels.

&&

.AVIATION...27/1105Z.

At 07Z at KLAX, the marine layer was 1500 ft deep. The top of the
inversion was at 3500 ft with a temperature of 24 C.

High confidence in VFR TAFs for KPMD and KWJF.

Low confidence in KBUR, KVNY, KPRB, especially after 06Z. There
is a 30-40 percent chance of LIFR/IFR cigs/vsbys after 06Z.

Moderate confidence in remaining TAFs. Flight category changes
may be 2 hours off and 3+ hours off after 00Z. There is a 20
percent of brief to no clear at KLAX and KSBA. There is a 50
percent chance of at least brief clearing for KOXR.

KLAX...Moderate confidence in TAF. No significant east wind
component expected.

KBUR...Moderate confidence in TAF. There is a 40 percent chance
of LIFR/IFR cigs/vsbys after 06Z.

&&

.MARINE...27/137 AM.

Small Craft Advisory (SCA) level winds and steep short period
seas of 7 to 9 feet will continue across the Outer Waters through
early to mid morning.

SCA conditions may return as early as Monday afternoon focused
across the Outer Waters with extended guidance hinting at the
continued SCA potential for this area much of the week.

Night to morning dense fog is possible through the weekend,
especially adjacent to the Central Coast.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...Small Craft Advisory in effect until 9 AM PDT this morning
      for zones 670-673. (See LAXMWWLOX).

&&

$$

PUBLIC...Rorke
AVIATION...Munroe
MARINE...Munroe/Lewis
SYNOPSIS...Lewis

weather.gov/losangeles

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