693
FXUS66 KSGX 101205
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
405 AM PST Mon Nov 10 2025

.SYNOPSIS...
Continued warmer inland today with areas of dense fog for coastal
areas early this morning. Cooling will spread inland for Tuesday
through Thursday with showers for Thursday into Friday along with
a slight chance of thunderstorms for Thursday evening. For next
weekend there will be drying and warming with high temperatures
for next Sunday still around 5 degrees below average.

&&

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

.SHORT TERM (Today through Wednesday)...
High pressure aloft over southern California will begin to weaken
today with greater weakening for Tuesday and Wednesday as a low
pressure system from the West moves toward the California coast.
Onshore lower-level flow will go from weakly offshore for inland
areas to weakly onshore on Tuesday with strengthening onshore flow
for Wednesday and Thursday.

High temperature for today will range from the 70s near the coast
to the mid 80s to lower 90s for the valleys with the lower 90s for
the lower deserts. With the cooling through Wednesday, high
temperatures on Wednesday will range from around 70 near the coast
to the 70s to around 80s for the valleys with the upper 80s for
the lower deserts.

The marine layer is around 1000 feet deep early this morning with
areas of dense fog for coastal areas with a Dense Fog Advisory in
effect until 8 AM this morning.

&&

.LONG TERM (Thursday through Sunday)...
There is greater model agreement on the arrival of precipitation
on Thursday with the heavier precipitation for Thursday afternoon
and evening with decreasing chances for showers for Friday and
Friday night.

The most likely rainfall through Friday night is from
one-half to one inch near the coast to 1 to 1.5 inches for
mountains, locally 1.5 to 2.5 inches for the coastal slopes of
the San Bernardino County mountains with one-quarter to one-half
inch for the Apple and Lucerne Valleys and one-quarter inch or
less for the lower deserts.

Through Friday, NBM has a 70 to 90 percent chance for one-
quarter inch or more of rainfall from the coast to the mountains
with a 25 to 45 percent chance of 2 inches or more for the
mountains. Snow levels above 10000 feet will lower to 5500 to 6500
feet for Friday morning through Friday night. For early Friday,
the NBM 25th percentile snow level is 4500 to 5500 feet with the
75th percentile snow level 6000 to 7000 feet. NBM for Big Bear
has a 42 percent chance for 1 inch or more of snowfall and a 9
percent chance for 6 inches or more.

There will be drying and warming for next weekend, but with Sunday
high temperatures still around 5 degrees below average.

&&

.AVIATION...
101030Z...Coasts/western Valleys...Low clouds based 100-400 feet
MSL, tops to 900 feet, and vis 0-4SM in FG/BR will continue this
morning. Scatter out 14-16Z. Low clouds and fog to gradually
redevelop after 05Z tonight and spread a little farther inland into
early Tuesday with slightly higher bases/vis.

Inland Valleys/Mountains/Deserts...Clear skies and VFR conditions
today and tonight. Localized east to northeast winds 20-30 knots
through passes and coastal slopes through 20Z.

&&

.MARINE...
Areas of dense fog with visibility 1 nautical mile or less is
expected this morning. Otherwise, no hazardous marine conditions are
expected through early Thursday. A storm system is expected to bring
stronger winds and higher seas for late Thursday through Friday.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Dense Fog Advisory until 8 AM PST this morning for Orange County
     Coastal Areas-Orange County Inland Areas-San Diego County
     Coastal Areas.

PZ...None.

&&

$$

PUBLIC...17
AVIATION/MARINE...MM