Anaheim, California Weather Forecast Discussion

410
FXUS66 KSGX 261024
AFDSGX
Area Forecast Discussion
National Weather Service San Diego CA
324 AM PDT Fri Sep 26 2025
.SYNOPSIS...
High temperatures of 5 to 10 degrees below average for today will
warm slightly for Saturday through Monday. There is a slight
chance of showers today along with a slight chance of
thunderstorms for this afternoon for the mountains and deserts.
Chances for showers and thunderstorms increase on Saturday for the
mountains and deserts and expand to the inland valleys with
chances for measurable rainfall of 35 to 45 percent during the
afternoon. Tuesday will be cooler with stronger onshore flow and
gusty southwest to west winds for the mountains and deserts, then
gradually warmer for the rest of the week with high temperatures
next Thursday still a few degrees below average.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
.SHORT TERM (Today through Sunday)...
A closed low pressure system will move into southern California
today, linger along the southern California border with northern
Baja on Saturday, the weaken and move to the east on Sunday.
Cooling will continue today with high temperatures for inland
areas of 5 to 10 degrees below average and locally 10 to 15
degrees below average for the inland valleys onto the lower
coastal mountain slopes. Highs today will range from around 70
near the coast to to the mid 70s to lower 80s for the Inland
Empire with the lower 90s for the lower deserts. The lower deserts
will cool a few more degrees on Saturday with the coast and
valleys warming slightly. Most areas will be a degree or two
warmer on Sunday.
The marine layer has deepened to around 4500 feet and continues
to deepen with satellite imagery showing coastal low clouds
extending well inland and onto the coastal slopes of the
mountains. There will patchy drizzle and some light showers for
this morning for coastal areas into some of the valleys.
As the center of upper level low pressure moves into the eastern
deserts of southern California for this afternoon. There is a 15
to 25 percent chance for showers and thunderstorms for the
mountains and deserts for this afternoon as moisture and
instability spreads into the area from the north.
The center of low pressure will move to near a position along the
border of southern California and northern Baja on Saturday with
moisture spreading into the area from the east. This will bring a
chance of showers and thunderstorms for the mountains, deserts,
and valleys. The greatest chances are for the mountains and
deserts of 35 to 45 percent during the afternoon. There will be
peak hourly rainfall of around one inch with isolated flash
flooding possible for the mountains, deserts, and inland valleys.
The low pressure system will weaken and move east on Sunday with a
10 to 20 percent chance of showers and thunderstorms for the
mountains and deserts on Sunday afternoon from lingering moisture
and instability.
&&
.LONG TERM (Monday through Thursday)...
Monday will be dry and slightly warmer, then cooler on Tuesday
with stronger onshore flow. High temperatures on Tuesday will
mostly be 5 to 10 degrees below average for inland areas to
locally 10 to 15 degrees below average for the higher elevations
of the mountains. High temperatures on Tuesday will range from
around 70 near the coast to the mid 70s to lower 80s for the
Inland Empire with around 90 for the lower deserts. This will be
followed by slow warming through the rest of the week with high
temperatures on Thursday still a few degrees below average for
inland areas.
&&
.AVIATION...
260930Z....Coasts/Valleys/Foothills...Low clouds based at 2000-3000
feet MSL have filled the coastal basin up into foothills with tops
to 4500 feet. Vis reduced in foothills. Patchy -DZ is expected, most
likely near the coast, through 17Z. This would intermittently reduce
cigs/vis. FG and terrain obscured in foothills. Only partial,
random, and intermittent scatter out is expected for anywhere in the
coastal basin today, with bases around 2500-3500 feet MSL. BKN-OVC
conditions will develop across the coastal basin into foothills
again tonight after 05Z into Saturday morning.
Mountains/Deserts...Brisk westerly winds 25-35 kts through mountain
passes and desert slopes until 13Z, gradually decreasing thereafter.
20% chance of TSRA 19-01Z across mountains and high desert. Bases
around 10000 feet MSL and storm tops to 30K feet.
&&
.MARINE...
No hazardous marine conditions are expected through Tuesday.
&&
.BEACHES...
South swell from Hurricane Narda will arrive this weekend. Swell of
4-5 feet with a period of 12-14 seconds will produce elevated surf
and a high rip current risk Sunday through Tuesday, especially for
south facing beaches, where sets could reach 7 feet.
&&
.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/BEACHES...MM

NWS SGX Office Area Forecast Discussion