938
FXUS66 KSGX 270030
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
530 PM PDT Tue May 26 2026

.SYNOPSIS...
The marine layer will remain around 5000 feet through Wednesday.
There could be some drizzle or light rain from this deep marine
layer at times, mainly late at night into the morning into
Thursday morning. High temperatures will lower several degrees for
Tuesday and Wednesday to as much as 20 to 25 degrees below
average for the mountains on Wednesday. Southwest to west winds in
the mountains and deserts will strengthen for this afternoon
through Wednesday night, with gusts of 40 to 50 mph with isolated
gusts to 70 mph through the passes. There will be warming for
Friday through next weekend with the marine layer becoming
shallower.

&&

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

New Aviation and Marine Discussion...

This afternoon...The marine layer is about 5000 ft deep with
widespread low clouds west of the mtns, although there are breaks
in the cloud layer with some reverse clearing at the coast.
Temperatures are generally lower than at this time yesterday, with
some locations in the mtns and high deserts as much as 15-20
degrees cooler.

The low pressure system with a closed upper low over NorCal will
move south through Thursday before turning east on Fri, moving
into the Rockies by Saturday. High temperatures today will be as
much as 10 to 15 degrees lower than yesterday for some inland
areas and as much as another 5 to 10 degrees cooler on Wednesday
for the mountains and deserts. High temperatures in the mountains
on Wednesday will be as much as 20 to 25 degrees below average.
High temperatures on Wednesday will be mostly in the 60s for the
coast and valleys and in the upper 70s to mid 80s for the lower
deserts, with the mountains mostly in the 40s and 50s and the
high desert in the 60s.

The marine layer will remain about 5000 ft deep (give-or-take)
through Thursday. The deep marine layer and thick saturated layer
could bring patchy drizzle to areas west of the mtns tonight/Wed
morning and again Wed night into Thu morning, although measurable
precipitation is not very likely.

This low pressure system will also bring stronger onshore flow
resulting in southwest to west winds gusting 40 to 50 mph at times
in the mtns and deserts. Gusts of up to 65 mph could also occur
in the northern Coachella Valley below the San Gorgonio Pass. The
strong winds will likely last from today through Wed night before
weakening on Thu.

A warming trend begins on Friday as the low pressure system begins
to move east but daytime temperatures will likely remain mostly below
normal through Sat. The warming continues into early next week.
Forecast details are uncertain for this period due to the spread
among model solutions but next Tue looks like it will be the
warmest day, with temperatures near or several degrees above
normal. SoCal will remain under weak troughing aloft with (weaker)
onshore flow at the surface which will likely moderate
temperatures west of the mtns.


&&

.AVIATION...
270030Z...Coast/Valleys/Foothills...Patchy areas of BKN/OVC low
clouds based around 3000-4000 ft MSL are beginning to fill back into
Orange County and will fill into the Inland Empire over the next few
hours. Bases are expected to generally stay around 3000-4000 ft MSL
through the period with occasional bases around 2500 ft MSL between
03-13Z. Patchy light drizzle will again be possible with the
deepening marine layer with the highest chances occurring between 06-
11Z. Low clouds will scatter out for the Inland Empire after 19Z but
look to remain over most of the coastal basin through the TAF period.

Higher Mountains/Deserts...Partly cloudy skies and VFR conditions
expected through the TAF period. Winds continue to gust out of the
west easing slightly after 17Z before increasing again after 21-22Z.
Widespread gusts up to 30-40 kts with isolated gusts to 65 kts
through the passes will be possible.

&&

.MARINE...
Winds and seas have increased, continuing into early Wednesday,
generating hazardous conditions for small craft in the outer waters,
especially near San Clemente Island. For more details, see the Small
Craft Advisory product. Winds and seas will decrease Wednesday
night, with no hazardous marine conditions expected thereafter
through Sunday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory until 5 AM PDT Thursday for Riverside County
     Mountains-San Diego County Deserts-San Diego County
     Mountains-San Gorgonio Pass near Banning.

     Wind Advisory until midnight PDT tonight for Apple and Lucerne
     Valleys.

PZ...Small Craft Advisory until 1 PM PDT Wednesday for Waters from
     San Mateo Point to the Mexican Border Extending 10 to 60 nm
     out including San Clemente Island.


&&

$$

PUBLIC...PG
AVIATION/MARINE...Villafane