452
FXUS66 KSGX 021141
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
341 AM PST Tue Dec 2 2025

.SYNOPSIS...
Patchy coastal low clouds for this morning will become more
widespread and spread onto the coastal slopes of the mountains for
late tonight into early Wednesday as the marine layer rapidly
deepens. Gusty north winds will develop through and below the
Cajon Pass on Wednesday afternoon with more widespread and
stronger northeasterly Santa Ana winds for Wednesday night along
and below the coastal slopes of the mountains with the stronger
gusts to around 45 mph. Northeast to east winds will continue for
Thursday into Friday morning, but with decreasing coverage and
strength. High temperatures will cool to a few degrees above
average on Wednesday. This will be followed by warming into early
next week with high temperatures for Tuesday of next week 10 to 15
degrees above average for inland areas.

&&

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

.SHORT TERM (Today through Thursday)...
The marine layer is around 1000 to 1500 feet deep early this
morning. Satellite imagery shows coverage of low clouds is quite
patch for the coastal waters and adjacent coastal areas with the
greatest coverage over northern Orange County.

A low pressure system moving southward into the Great Basin
tonight will strengthen the onshore flow across southern
California. The marine layer will deepen rapidly through tonight.
The marine layer will deepen to around 4500 feet for early
Wednesday morning with coastal low clouds spreading well inland
and onto the coastal slopes of the mountains. There could be some
light showers or patchy drizzle late tonight into early Wednesday
morning for the inner coastal waters into adjacent coastal areas
with the chance of measurable rainfall less than 10 percent.

Gusty north winds will develop through and below the Cajon Pass
on Wednesday afternoon with more widespread and stronger
northeasterly winds for Wednesday night along and below the
coastal slopes of the mountains with the stronger gusts to around
45 mph. Northeast to east winds will continue for Thursday into
Friday morning, but with decreasing coverage and strength. Lowest
daytime humidity on Thursday for the valleys and inland coastal
areas will fall to 15 to 20 percent, then recover to 20 to 25
percent on Friday.

Cooling will spread inland through Wednesday with high
temperatures on Wednesday a few degrees below average. High
temperatures for the coast and valleys will warm a few to around 5
degrees on Thursday with the warming spreading inland on Friday
through the weekend.

&&

.LONG TERM (Friday through Monday)...
Northeast to east winds will continue to weaken through Friday
morning with the stronger gusts to 35 mph on Friday morning. Dry
weather with a warming trend will continue into early next week.
With the warming, high temperatures for Tuesday of next week will
be 10 to 15 degrees above average for inland areas. High
temperatures for next week will range from the lower 70s near the
coast to the mid 70s to lower 80s for the valleys with the lower
deserts around 80.

&&

.AVIATION...
021030Z....Patchy and intermittent coastal low clouds and fog will
continue this morning through 16Z. Bases with any cigs that form
will be 500-900 feet MSL, with vis 1-5SM. Isolated vis 0-1SM. More
widespread low clouds to develop after 01Z rapidly and move fully
inland to nearly fill the entire coastal basin overnight into
Wednesday. Bases would start out fairly low 500-1000 feet MSL, but
will rise to 1800-2500 feet MSL with tops rising above 4000 feet.
Locally reduced vis over higher coastal terrain and foothills.

&&

.MARINE...
No hazardous marine conditions are expected today through Saturday.

&&

.BEACHES...
Astronomical high tides are forecast to occur each morning Wednesday
through Friday, threatening minor tidal overflow and beach erosion.
Chances of these impacts are higher Wednesday and Thursday mornings
as elevated surf up to 4-6 feet combines with the high tides,
especially for San Diego County. Check the Coastal Hazard Message
for details.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement from this evening through Friday morning
     for Orange County Coastal Areas-San Diego County Coastal
     Areas.

PZ...None.

&&

$$

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