Moreno Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

870
FXUS66 KSGX 080947
AFDSGX

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

.SYNOPSIS...
The warming trend continues through midweek, peaking Monday and
Tuesday, 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...

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...
080930Z....Coast/Valleys...Low clouds based 1100-1700 ft MSL with
tops 2000-2500 ft MSL continue to push inland. Coastal basin has
been slower to fill in than the past few days with clouds are just
now spilling into the IE. Patchy -DZ and minor vis restrictions
possible along with IFR cigs for elevated inland areas. Low clouds
should clear for the inland areas through 16-18z Sunday, with
partial and intermittent clearing for coastal areas Sunday
afternoon, especially for Orange County and into northern San Diego
County as was seen today. Low clouds slowly push inland again after
00z Monday. Lowering bases may prevent the IE from filling in
entirely overnight. However, elevated inland valleys that do fill in
will likely experience vis restrictions and patchy FG.

Mountains/Deserts...Mostly clear skies and unrestricted VIS
through Sunday evening.

&&

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

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.


&&

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

&&

$$

PUBLIC...SS
AVIATION/MARINE...KW