Murrieta, California Weather Forecast Discussion

759
FXUS66 KSGX 061049
AFDSGX
Area Forecast Discussion
National Weather Service San Diego CA
349 AM PDT Mon Oct 6 2025
.SYNOPSIS...
High pressure to the southeast will bring gradually warmer days
into Wednesday. The marine layer will decrease in depth with night
and morning low clouds not spreading as far into the valleys by
Wednesday. For late Thursday into Saturday, moisture from the
remnants of Hurricane Priscilla is expected to spread into the
southwestern California with chances for showers peaking on Friday.
Low pressure from the northwest will bring cooling for next
weekend with high temperatures as much as 5 to 10 degrees below
average for inland areas next Sunday.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
.SHORT TERM (Today through Wednesday)...
High pressure to the southeast will bring gradually warmer days
through Wednesday. With the warming, high temperatures for the
coast and valleys will remain a few degrees below average with the
mountains and high desert a few degrees above average. High
temperatures on Wednesday will range from around 70 near the coast
to the 80s for the Inland Empire with the lower to mid 90s for
the lower deserts. The marine inversion will gradually strengthen
and lower with night and morning coastal low clouds increasing in
coverage, but not spreading as far into the valleys for Tuesday
and Wednesday.
&&
.LONG TERM (Thursday through Sunday)...
Low pressure off the West Coast is expected to direct moisture
from the remnants of Hurricane Priscilla into the southwestern
states. The NHC track forecast is closest to the ensemble guidance
of the ECMWF. For late Thursday afternoon through late Saturday
afternoon, the model cluster that is wettest across southern
California contains more than half of ECMWF ensemble members.
Deterministic NBM output has lower level moisture peaking across
the area during the day on Friday. Chances for measurable rainfall
peak on Friday at 25 to 35 percent with chances for one inch or
more of rainfall in the mountains around 5 percent.
The ECMWF Extreme Forecast Index shows the most likely locations
for climatologically-unusual rainfall for Thursday night and
Friday extends from off the central coast of Baja through
northern Baja into the eastern deserts of southern California and
into southwestern Arizona.
Low pressure to the northwest will bring cooling for next weekend
with high temperatures for inland areas next Sunday as much as 5
to 10 degrees below average.
&&
.AVIATION...
060930Z....Coasts/western Valleys...Low clouds near 1500-2000
feet MSL will continue to fill coastal areas and western valleys
through sunrise. Scatter out to occur by 16-18Z, but with patchy
cigs persisting and intermittent at the coast thereafter. Low
clouds with similar bases moving into the coast and western
valleys after 02Z overnight into Tuesday.
Inland Valleys/Mountains/Deserts...Mostly clear and VFR conditions
will continue today and tonight.
&&
.MARINE...
No hazardous marine conditions are expected through Friday, except
there is a slight chance of thunderstorms near the coast on Friday
afternoon.
&&
.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...17
AVIATION/MARINE...MM

NWS SGX Office Area Forecast Discussion