Santa Rosa Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

142
FXUS66 KLOX 051010
AFDLOX

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
310 AM PDT Thu Jun 5 2025

.SYNOPSIS...04/744 PM.

Strong onshore flow and a persistent marine intrusion will
continue night through morning low clouds and fog through
Saturday. Some thinning of the marine layer depth will take place
over the weekend as onshore flow weakens. As a result, low clouds
and fog will retreat to the coast and lower valley areas Sunday
through Tuesday. Cooler than normal temperatures through the end
of the week, then a warming trend will develop for the weekend,
especially away from the beaches.

&&

.SHORT TERM (TDY-SAT)...05/256 AM.

There will be broad pos tilt troffing aloft along with strong
onshore flow at the sfc. The trof has lifted the marine layer to
over 3000 ft and marine layer stratus covers all of the csts/vlys
and even the cstl slopes. There is enough lift from the trof to
create a chance of drizzle esp near the foothills. The onshore
push in the afternoon will approach 8 mb and this will bring slow
clearing to the inland areas and no clearing at many of the
beaches. There is just enough instability and moisture with the
trof to bring a slight chc (20 percent) to the eastern San
Gabriels and northern VTA mtns. The steering flow is exceedingly
weak and any storms that develop will be very slow movers. Max
temps will be very similar to ydy about 3 to 6 degrees blo normal.
The strong onshore push will bring gusty winds to the Antelope
Vly as well as a stronger than normal seabreeze to the beaches.

Friday and Saturday will be fairly similar days. Srn CA will be
under dry SW flow from a high hgt (578 dam) upper low to the west
of SLO county. Hgts will rise a few dam each day and the onshore
flow will weaken slightly. Night through morning low clouds will
persist but there will be slightly less vly coverage, slightly
faster clearing away from the beaches and a few more beaches will
see the sun in the afternoon. Max temps will rise a few degrees
each day and by Saturday will approach normals.

The onshore gradients will generate the usual gusty southwesterly
winds across interior sections both Friday and Saturday. However,
outside of Lake Palmdale, expect winds to remain below advisory
levels.

.LONG TERM (SUN-WED)...05/309 AM.

The xtnd mdls are coming into better agreement and now it looks
likely that some degree of ridging will set up over the area. The
EC remains the warmest mdl, but now the GFS has trended warmer.
Look for building hgts both Sun and Mon along with a decrease in
onshore flow. In fact, there is forecast offshore flow from the
north both Monday and Tuesday morning.

The night through morning low clouds will continue but there will
be less vly intrusion due to the weaker onshore push and the
higher hgts which will squish the marine layer down below many vly
elevations.

Look for two days of warming both Sun and Mon. The coasts will
warm the least, but the vlys will reach into upper 80s. Further
inland areas like the Antelope Vly will soar up to 100 degrees.
Monday`s max temps will be 5 to 10 degrees above normal for the
non coastal areas.

The bulk of ensembles show hgts falling Tue and Wed along with an
increase in onshore flow. Look for more marine clouds and two days
of cooling.

&&

.AVIATION...05/0700Z.

At 0515Z at KLAX, the marine layer was 2400 feet deep. The top of
the inversion was at 5100 feet with a temperature of 18 C.

High confidence in VFR TAFs for KPMD and KWJF.

Moderate confidence in all remaining TAFs. Flight cat change
timing may be off by +/- 90 minutes and cig hgt by +/- 300 ft.

KLAX...Moderate confidence TAF. There is a 30 percent chc of
OVC008 conds 10Z-14Z. SCT conds could arrive anytime between 19Z
and 21Z with a 25% chance of no clearing. No significant east
wind component expected.

KBUR...Moderate confidence in TAF. Flight cat change timing may
be off by +/- 90 minutes. There is a 20 percent chc that cigs will
remain AOA 010.

&&

.MARINE...04/854 PM.

High confidence in unseasonably quiet conditions through Friday
with no Small Craft Advisories (SCA) needed. More seasonally
typical northwest to west winds will form by Saturday or Sunday,
with short period choppy seas likely nearshore. Next week will
bring increasing chances for both SCA winds and seas.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.

&&

$$

PUBLIC...Rorke
AVIATION...Rorke
MARINE...Black
SYNOPSIS...Hall

weather.gov/losangeles

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