394
FXUS66 KSGX 031614
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
914 AM PDT Fri May 3 2024

.SYNOPSIS...
This weekend expect cloudy and cool conditions with gusty winds in
the mountains and deserts and periods of showers in and west of the
mountains. Southwest to west winds will increase in strength through
the day Saturday, peaking Saturday night into early Sunday. The
best chances for showers will also be Saturday night into early
Sunday. Dry and warmer conditions expected for next week.

&&

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

Visible satellite at 9 AM was showing low clouds from the ocean to
the coastal mountain slopes. Areas of light drizzle have been
reported, mostly in the valleys. Areas of drizzle will diminish
through the morning, with very slow clearing of the cloud deck this
morning. By this afternoon, the valleys should be seeing some
sunshine, with low confidence in complete clearing at the coast and
beaches.

A low pressure system is on track to move inland through California
on Saturday night and dig into the Great Basin on Sunday. This
system will bring cooler, cloudier, windier (in the mountains and
deserts), and wetter conditions (in and west of the mountains) to
Southern California this weekend. Southwest to west winds will begin
to increase Saturday afternoon, peaking in strength Saturday night
into Sunday, gradually diminishing into Sunday night. Winds will be
strongest on the desert mountain slopes, through passes, and into
portions of the deserts. Peak gusts of 55 to 65 mph expected.
Isolated gusts to 75 mph are possible in wind prone locations on the
desert foothills of the San Bernardino mountains late Saturday
night. Winds will gradually weaken into Sunday night. For much of
next week, a broad troughing pattern over the United States will
enhanced the onshore pressure gradient, bringing periods of breezy
winds to the mountains and deserts each afternoon and evening.

The best chance for showers is late Saturday night into Sunday
morning. Coverage will be scattered with mostly light amounts
expected. A few hundredths to a tenth of an inch of rain are
expected for the coast and valleys. One-quarter to locally one-half
inch expected on the coastal slopes of the mountains with the
greater amounts most likely on the coastal slopes of the San
Bernardino County mountains. A trace of snow is expected above 7000
ft. Dry conditions are expected by Sunday afternoon.

Highs Saturday are expected to be 3 to 5 degrees below average for
the coast and valleys, and near average for the deserts. Sunday will
be even cooler, especially for inland areas with highs 10 to 15,
locally up to 20 degrees below average for the valleys, mountains,
and deserts. Warming conditions expected on Monday, with highs as
much as 10 to 15 degrees warmer for the mountains and High Desert.
Much slower warming for Tuesday through Thursday with Thursday high
temperatures still a few degrees below average.

&&

.AVIATION...
031530Z...Coasts/Valleys...Low clouds based at 1000-1800 feet MSL
with pockets of -DZ lowering cigs to 800 feet and inland vis 2-5SM.
Foothills obscured, but lifting and clearing. The clearing
progression inland to coast should accelerate after 17Z, but with
limited or no clearing in coastal areas. Low clouds will spread
inland again this evening with slightly higher bases and push into
foothills again by 13Z Saturday. Scatter out Saturday will be slow
and gradual again Saturday morning.

Otherwise...Clear skies with unrestricted VIS will continue through
tonight, with increasing high clouds above 15000 feet MSL Saturday.

&&

.MARINE...
No hazardous marine conditions are expected through Saturday
morning. Gusty west to northwest winds late Saturday through Sunday
evening are likely to generate hazardous boating conditions,
especially in the outer waters (30-60 NM from the coast). Current
projections for strongest winds are on Sunday when gusts could be 25-
30 knots near San Clemente Island with a few gusts 20-25 knots near
the coast. No additional hazardous marine conditions are expected
Monday and beyond.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory from noon Saturday to 8 PM PDT Sunday for Apple
     and Lucerne Valleys-San Bernardino County Mountains-San
     Gorgonio Pass Near Banning.

     Wind Advisory from 3 PM Saturday to 8 PM PDT Sunday for
     Coachella Valley-Riverside County Mountains-San Diego
     County Deserts-San Diego County Mountains.

PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE...MM