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000
FXUS66 KSGX 242033
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
133 PM PDT Wed Apr 24 2024

.SYNOPSIS...
A deep marine layer; gusty winds in the mountains and deserts; and
cooler conditions will prevail through Friday. Patchy drizzle or
light rain is expected each night and morning west of the mountains.
Gusty southwest to west winds will peak each afternoon and evening
in the mountains and deserts through Friday. Winds will weaken
through the weekend. Drier and warmer with a shallower marine layer
expected early next week.

&&

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

Low clouds are expected to fill in the coastal basin again tonight
into Thursday morning. Deep marine layer moisture combined with lift
from a low pressure system passing through Southern California and
Northern Baja will generate areas of drizzle and light rain this
evening and overnight. The greatest coverage is expected to be in
the coast and valleys in San Diego County and along the coastal
mountain slopes. Any accumulations for the coast and valleys will be
light, with 0.10 inches or less expected. On the coastal mountain
slopes, around 0.25 inch is expected. Marine layer low clouds may
become patchier Thursday night into Friday morning, but areas of
drizzle or light rain are still possible. Dry conditions expected
for the weekend into early next week.

Gusty southwest to west winds are expected in the mountains and
deserts through Friday. Peak winds gusts will be 50 to 65 mph. Gusts
could locally reach up to 75 mph through the San Gorgonio Pass.
Winds will peak each afternoon and evening. Winds will gradually
decrease in the the weekend, with weaker winds expected early next
week.

Cooler conditions expected for inland areas Thursday, with a few
degrees of warming on Friday for the coast. High temperatures will
be as much as 10 to 15 degrees below average on Thursday for the
mountains and valleys. A warming trend is expected for Saturday
through Monday with not much change on Tuesday. Weak high pressure
aloft is expected to prevail but there are some model differences
for early in the week which would impact the strength of the onshore
flow and the depth of the marine layer. This uncertainty creates
greater spread of the high temperature forecasts for locations in
the coast and valleys. If the warming develops, high temperatures
would be near average for most locations on Sunday with high
temperatures on Monday and Tuesday 3 to 7 degrees above average.

&&

.AVIATION...
241945Z...Coast/Valleys/Foothills...SCT-BKN clouds with bases 2500-
3500 feet MSL and tops to 4000 feet will continue this afternoon.
VIS 0-5SM where clouds and terrain intersect, obscuring foothills.
Expect random and intermittent clearing for most areas west of the
mountains now through 03Z, most likely window for clearing skies 20-
00Z. Low clouds to fill the coastal basin again after 00Z with
similar bases, but tops rising to 6000 feet MSL early Thursday.
-SHRA or -DZ also possible after 06Z, lowering cigs and vis.

Mountains/Deserts...Mostly clear skies above 4000 feet MSL on
coastal slopes, with unrestricted VIS today and tonight.

&&

.MARINE...
No hazardous marine conditions are expected through Thursday night.
Stronger winds and choppy seas arrive Friday morning and continue
into Saturday morning, likely generating hazardous conditions,
especially in the outer waters.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory from 5 PM this afternoon to 11 PM PDT Friday for
     Apple and Lucerne Valleys-Coachella Valley-Riverside County
     Mountains-San Bernardino County Mountains-San Diego County
     Deserts-San Diego County Mountains-San Gorgonio Pass Near
     Banning.

PZ...Gale Watch from Friday afternoon through late Friday night for
     Waters from San Mateo Point to the Mexican Border Extending
     30 to 60 nm out including San Clemente Island.


&&

$$

PUBLIC...CO
AVIATION/MARINE...Adams