870
FXUS66 KSGX 041715
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
915 AM PST Thu Dec 4 2025

.SYNOPSIS...
Santa Ana winds will weaken this morning with weaker and more
localized winds continuing at times into Friday morning. Patchy
night and morning coastal low clouds could return near the coast
over the weekend. The coast into the valleys will warm today while
the deserts cool. There will be a warming trend for all areas for
Sunday through Wednesday with high temperatures for next Tuesday
and Wednesday as much as 12 to 18 degrees above average for the
lower elevations of the mountains and for the inland valleys.

&&

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


.Morning Update...

Mid-level clouds continue to dissipate, which led to a gorgeous
sunrise across the region this morning. Santa Ana winds continue
to become more localized with gusts near mountain passes and
adjacent foothills gusting near 20-35 MPH. This trend will
continue through the day as a trough pushes further east into the
Great Plains, allowing the pressure gradient to relax. The
forecast remains on track for lighter offshore flow to continue
into Friday across these regions with a warming trend by Sunday
into next week.

.Previous Discussion (230 AM Thursday)...

.SHORT TERM (Today through Saturday)...

For San Diego County except for northwest San Diego County, winds
through sunrise are expected to gradually decrease in strength
and coverage with more localized and weaker winds continuing at
times into Friday morning. Below the Cajon Pass and along the
below the coastal slopes of the Santa Ana Mountains, winds are
expected to increase in coverage through around sunrise, then
decrease in strength and coverage through the morning with more
localized and weaker winds continuing into Friday morning.

The local WRF shows some patchy low clouds could return near
coast of southern San Diego County and northern Orange County
early Friday. More widespread coverage over the coastal waters may
return for Friday night into Saturday morning, locally reaching
the coast.

High temperatures for today will warm for the coast into the
valleys and cool for the lower deserts. Cooling will begin to
spread into coastal areas on Friday as inland areas warm. On
Saturday, inland areas will continue to warm a few more degrees
with not much change near the coast. High temperatures on Saturday
will range from the lower to mid 60s near the coast to the upper
60s to mid 70s for the valleys with the lower to mid 70s for the
lower deserts.

&&

.LONG TERM (Sunday through Wednesday)...
Subtropical high pressure over the eastern Pacific will extend to
near the coast of Baja and southern California with dry generally
northwest flow aloft over southern California. A warming trend
will continue for Sunday through Tuesday with not much change on
Wednesday. There will be weak offshore flow around Monday and
Tuesday of next week, but with less drying and weaker winds than
for the ongoing offshore flow.

High temperatures on Sunday will be a few to around 5 degrees
above average for the coast and valleys and within a few degrees
of average for the mountains and deserts. High temperatures on
Sunday will range from the mid to upper 60s near the coast to the
70s for the valleys and inland Orange County with the mid to upper
70s for the lower deserts.

With the warming, high temperatures for Tuesday and Wednesday will
be as much as 12 to 18 degrees above average for the lower
elevations of the mountains and for the inland valleys. High
temperatures on Wednesday will range from around 70 near the coast
to the mid 70s to lower 80s for the valleys with the lower 80s
for the lower deserts.

&&

.AVIATION...
041630Z....Northeast winds 25-35 kts continue this morning from the
foothills locally westward into eastern valleys, with MOD
up/downdrafts, along with pockets of LLWS where winds do not
surface. Winds will taper off and become more localized, confined to
mountain passes and foothills, after 18Z, continuing in these areas
into early Friday. Mostly clear skies through the period.

&&

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

&&

.BEACHES...
Very high tides will occur this morning and Friday morning,
threatening coastal flooding, minor tidal overflow and beach
erosion. Chances of these impacts are highest this morning as
elevated surf up to 5 feet will combine with the high tides, mostly
in 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 through Friday morning for Orange County
     Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

$$

UPDATE...APR
PUBLIC...17
AVIATION/MARINE...CSP