973
FXUS66 KSGX 031044
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
344 AM PDT Thu Apr 3 2025

.SYNOPSIS...
A low pressure system over the western states will maintain
cooler than average temperatures through Friday though with
warming for today and Friday. Scattered showers will continue
today with the greatest coverage and amounts for this afternoon
and early evening for the mountains and valleys. There is a slight
chance of showers for Friday afternoon for the mountains and
inland valleys. Then dry and warmer for the weekend with high
temperatures warming to around average. Not much change in
temperatures for Monday with stronger onshore flow. Then warmer
for the middle of next week with high temperatures 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 Saturday)...
The low pressure system over the western states will move slowly
eastward through Saturday. Scattered showers over San Diego
County from the coast to the  mountains will decrease during the
morning. The greater coverage and amounts for the afternoon and
evening are expected for the mountains and valleys. There is also
a slight chance of thunderstorms for this afternoon.

Through this evening, additional rainfall and liquid-equivalent
above the snow level is expected to range from one-tenth inch or
less near the coast to one-quarter to locally one-half inch for
the mountains and valleys. A snow level near 4000 to 4500 feet
early this morning will rise to 5000 to 5500 feet for this
afternoon and evening with a few inches of snowfall possible,
mostly above 5000 to 5500 feet. There is also a slight chance of
showers for the mountains and inland valleys for Friday afternoon
with dry weather then expected into next week.

High temperatures will gradually warm through Saturday. High
temperatures today that are 5 to 10 degrees below average for
coastal areas to as much as 15 to 20 degrees below average for the
mountains will warm on Saturday to around average for the coast
and valleys and to a few to around 5 degrees below average for
the mountains and deserts.

&&

.LONG TERM (Sunday through Wednesday)...
Warming will continue on Sunday with the lower deserts a few
degrees above average to 5 to 10 degrees above average for the
coast and valleys with high temperatures from around 70 near the
coast to the mid 70s to lower 80s for the valleys with the mid to
upper 80s for the lower deserts.

A low pressure system moving inland through northern California on
Sunday night and Monday will pause the warming for the coast on
Monday with resumed warming continue through Wednesday and
Thursday. With the warming, high temperatures on Thursday will be
as much as 15 to 20 degrees above average for the mountains and
inland valleys with high temperatures from the lower to mid 70s
near the coast to the mid 80s to lower 90s for the valleys with
high temperatures for the lower deserts near 100.

&&

.AVIATION...
030930Z...Coast/Valleys/Coastal Mountain Slopes...SCT-BKN clouds
based between 2500-5000 feet MSL, with tops reaching 7000 feet, will
continue most BKN near foothills and in San Diego County. -SHRA most
likely in these areas with briefly lower cigs around 2000 feet MSL
through 16Z. SCT -SHRA and isold TSRA 19-00Z in all areas except
northern Orange County. Lower cigs around 2500 feet MSL and briefly
reduced vis 3-5SM in heavier RA. Decrease in -SHRA chances after 23Z
and SCT to locally BKN clouds 2500-3500 feet MSL after 02Z.

Desert Mountain Slopes/Deserts...Mostly clear skies through 18Z.
Building clouds based around 5000-8000 feet MSL over mountains will
produce scattered -SHRA and isold TSRA with lower bases and vis
briefly in pcpn 19-00Z. Gradual clearing after 02Z.

&&

.MARINE...
Hazardous winds and seas will continue to diminish this morning. See
the Small Craft Advisory, in effect until 7 AM, for details. No
additional hazardous marine conditions are expected through Monday.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 7 AM PDT this morning for Waters from
     San Mateo Point to the Mexican Border Extending 10 to 60 nm
     out including San Clemente Island.

&&

$$

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