Agua Caliente, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

902
FXUS66 KSGX 081600
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
900 AM PDT Sun Jun 8 2025

.SYNOPSIS...
The warming trend sets in through midweek, peaking Monday through
Wednesday for inland areas, before a slow cooldown towards the
end of the week. The marine layer becomes shallower through mid
week with night and morning low clouds for the coastal areas and
western valleys.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

.UPDATE...
No meaningful shift in the forecast from the previous package. The
deep marine layer is quickly eroding from inland areas and will
filter to the coast through the morning. Some light patchy drizzle
was observed this morning, but increasing heights in the coming
days will favor a shallower marine layer with limited drizzle
potential. Still, the marine layer will persist across the coastal
areas each morning, limiting heating while the deserts warm with
the thermal ridge axis displaced to the east. Confidence has
decreased on exceeding 110F in the lower deserts and Coachella
Valley on Tuesday, but conditions remain favorable for
temperatures at least 5-10 degrees above normal for eastern areas
Monday through Wednesday.

.PREVIOUS FORECAST FROM 247 AM...
Marine layer low clouds are slowly making their way into the
Inland Empire with clear skies elsewhere. The marine layer is more
shallow than last night with a cloud deck that is not quite as
thick, limiting the potential for drizzle this morning. Clearing
will be a struggle for the coastal areas, especially in San Diego
County where the gloom is likely to persist through the day.

An upper level ridge of high pressure tries to build in from the
south today, though the closed upper low slowly inches eastwards
towards the Central/So Cal coast. A few degrees of warming is
expected for inland areas, with generally little change closer to
the coast as the persistent marine layer keeps temps down. 00Z
deterministic models, supported by about 70% of the global
ensemble members, show the forecast track of the upper low has
shifted further south as it digs into southeast CA on Monday with
the upper ridge amplifying off the coast. Latest NBM runs have not
caught on to this shift yet, but if it holds it could result in
less warming on Monday than originally thought. The struggle
continues into Tuesday and possibly even Wednesday as there are
hints of a gulf surge into the lower deserts both days. This
added moisture could dampen heating by about 5 degrees in those
areas should the surge occur and moisture doesn`t mix out early in
the day. If the moisture doesn`t materialize, the building ridge
could easily produce temperatures near 110 in the lower deserts.
Confidence is much higher in continued warming for inland areas
Tuesday and Wednesday as the upper ridge strengthens.

An upper level trough slowly amplifies off the West Coast for the
latter half of the week, though the trend has been towards this
trough being positioned further west and forcing a strengthening
upper ridge near the Four Corners region, with So Cal under dry
southwesterly flow wedged between the two. The result is slower
and less noticeable cooling with only subtle changes in the
marine layer depth Thursday through next weekend.

&&

.AVIATION...
081600Z....Coast/Valleys...OVC low clouds with bases 500-1200 ft MSL
have filled in much of the coastal basin. Low clouds will clear
inland areas through 18z, with partial and intermittent clearing for
coastal areas this afternoon. Low clouds slowly push inland again
after 00z Monday. Patchy cig coverage expected to reach portions of
the Inland Empire 09-12Z Mon. Bases tonight into Mon AM are expected
to be 500-1200 ft MSL, with vis restrictions 2-4 SM in patchy FG for
elevated inland valleys.

Mountains/Deserts...Mostly clear skies and unrestricted VIS
through tonight.

&&

.MARINE...
No hazardous marine conditions are expected through Thursday.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

$$

PUBLIC...Zuber
AVIATION/MARINE...CO