108
FXUS66 KSGX 101155
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
455 AM PDT Fri Apr 10 2026

.SYNOPSIS...
Increasing onshore flow and a pair of low pressure systems from
the northwest will bring a cooling trend through the weekend with
stronger and gusty southwest to west winds for the mountains and
deserts during the afternoons and evenings through Sunday. Winds
will gust to 35 to 45 mph today, and 40 to 50 mph for Saturday
and Sunday. There is a chance of showers for tonight into Saturday
morning. A second low pressure system from the northwest will
bring more widespread showers for late Saturday night through
Sunday along with a slight chance of thunderstorms on Sunday
afternoon. Decreasing showers could linger into Sunday night and
Monday morning. Then drying and warming through the middle of next
week.

&&

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

.SHORT TERM (Today through Sunday)...
A low pressure system centered off the northern California coast
early this morning will weaken as it moves through central and
southern California tonight. Onshore flow is strengthening the
the marine layer deepening with satellite imagery showing low
clouds over the coastal waters extending into western portions of
the San Diego County valleys and into southern and western
portions of the Inland Empire and into the Cajon Pass.

The cooling trend will continue through the weekend. Today will
be a few degrees cooler than Thursday with greater cooling for
Saturday and again on Sunday. High temperatures today will range
from around 70 near the coast to the the lower to mid 70s for the
valleys with the lower deserts in the mid 80s to lower 90s.

With the cooling for Saturday and Sunday, Sunday high temperatures
for inland areas will be around 10 to 15 degrees below average to
15 to 20 degrees below average for the mountains above 6000 feet.
High temperatures on Sunday will be mostly in the 60s for the
coast and valleys and in the 70s for the lower deserts.

There is a chance of showers for tonight into Saturday morning
with rainfall from the coast to the mountains mostly one-tenth
inch or less to locally one-quarter inch in the mountains. A snow
level around 8500 feet late this afternoon will fall to around
6500 feet for late tonight into Saturday morning.

For late Saturday night through Sunday, a second low pressure
system from the northwest will bring additional rainfall ranging
from around one-third inch near the coast to one-half to locally
one inch in the mountains with less than one-qaurter inch in the
high desert and less than one-tenth inch in the lower deserts.
A snow level around 6500 feet late Saturday night will rise to
6500 to 7000 feet on Sunday.

There will be stronger and gusty southwest to west winds for the
mountains and deserts, strongest during the afternoon and evening
each day with gusts to 35 to 45 mph today and 40 to 50 mph for
Saturday and Sunday. On Saturday and Sunday, winds along the lower
desert slopes of the San Bernardino Mountains could gust to 65 mph
at times.

&&

.LONG TERM (Sunday night through Thursday)...
Some additional showers could linger for Sunday night into Monday
morning with the snow level lowering to 5000 to 5500 feet late
Sunday night into Monday morning. Not much change in high
temperatures is expected on Monday.

For Tuesday through Thursday, it will be dry and warmer with high
temperatures warming to around average for Wednesday and
Thursday with high temperatures ranging from around 70 near the
coast to the 70s in the valleys with the lower deserts around 90.

&&

.AVIATION...
101200Z...Coasts/Valleys...Low clouds based 1100-1500 ft MSL are
currently widespread along the coast with patchier coverage through
the west IE. Occasional scatter out likely inland, then full scatter
out 16-18Z this morning. BKN-OVC deck moves inland after 02Z,
lifting from 2000-2500 ft MSL to above 3500 ft MSL overnight. Spotty
-SHRA moves inland after 03Z through Sat morning, bringing periodic
lowered cigs and vis 5-6 SM.

.Mountains/Deserts...West to southwest winds increase through
mid-afternoon with gusts 35-50 kt through passes, along deserts
slopes and locally into the deserts. Local areas BLDU (vis 3-5SM)
expected. Moderate up/downdrafts in lee of mtns.

&&

.MARINE...
There is a slight chance of thunderstorms Sunday afternoon.
Additionally there will be periods of increased northwest winds with
gusts 15 to 20 kt and choppy seas that could generate hazardous
conditions through the day Sunday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

$$

PUBLIC...17
AVIATION/MARINE...CSP

NWS San Diego (SGX) Office