118
FXUS66 KSGX 032042
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
142 PM 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. Some
drizzle may occur Saturday morning, but the the best chances for
showers and accumulating rain 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...

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. There is a 30 to 40 percent chance
that a few isolated gusts to 70 mph are possible in wind prone
locations on the desert foothills of the San Bernardino mountains
and near the San Gorgonio Pass 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 westerly
winds to the mountains and deserts each afternoon and evening.

A weak coastal eddy is expected to help deepen the marine layer
overnight. This could result in patchy drizzle for the coast and
valleys tonight into Saturday morning. The best chance for showers
and accumulating rain is late Saturday night into Sunday morning.
Shower coverage will be scattered with mostly light amounts expected
to accumulate. 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. This will be a quick moving system and dry conditions are
expected by early 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. Cold conditions expected Monday morning, especially in
the High Desert where lows are forecast to fall to the mid to upper
30s. The highs on Monday will make up for the cool conditions Sunday
and Monday morning, with temperatures as much as 10 to 15 degrees
warmer than Sunday for the mountains and High Desert. Conditions are
expected to gradually warm into the end of next week.

&&

.AVIATION...
032030Z...Coasts/Valleys/Foothills...SCT to locally BKN clouds near
the coast based at around 2000-2500 feet MSL. Low clouds based at
1200-1800 feet MSL will spread ashore and inland this evening push
into foothills by 13Z Saturday. Bases will rise to around 2000 feet
MSL with tops up to 3500-4000 feet, obscuring some higher terrain.
Scatter out Saturday will be slow and gradual, around 17-20Z.

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 much of
Saturday. Stronger and gusty west to northwest winds Saturday
evening through Sunday evening will generate hazardous boating
conditions, especially in the outer waters. Check the Small Craft
Advisory for details. 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...Small Craft Advisory from 3 AM to 10 PM PDT Sunday for Coastal
     Waters from San Mateo Point to the Mexican Border and out
     to 30 nm.

     Small Craft Advisory from 6 PM Saturday to 3 AM PDT Monday for
     Waters from San Mateo Point to the Mexican Border Extending
     30 to 60 nm out including San Clemente Island.


&&

$$

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