DesertWeather.com

931
FXUS66 KSGX 010947
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
247 AM PDT Wed Apr 1 2026

.SYNOPSIS...
Showers are expected to end this morning from northwest to
southeast. Cooler and breezy conditions will continue through
Thursday with west winds in the mountains and deserts gusting to
35 to 45 mph with isolated gusts to 55 mph. For Friday and
Saturday, offshore lower-level flow and high pressure aloft will
bring warming and drying with northeast winds along and below the
coastal slopes of the mountains gusting to 30 to 40 mph. Then
slightly cooler with weaker winds for early next week.

&&

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

.SHORT TERM (Wednesday through Friday)...
Showers have been spreading into portions of southwest California
from the west since late Tuesday afternoon. The showers are
expected to decrease from northwest to southeast during this
morning. In general, rainfall has been greater to the north and
less to the south and greater in the mountains with less at lower
elevations. Showers that moved through the Ontario airport area
produced one-third to three-quarters of an inch in the four
observations nearest the airport. The more widespread showers
moving through northern portions of the Inland Empire around 2 AM
could produce another one-quarter to one-third inch with isolated
rainfall to around three-quarters of an inch.

Beyond the showers this morning, it will be cooler today and
Thursday with high temperatures near sea level around average to
around 5 degrees below average for the mountains and inland
valleys. High temperatures for the coast and valleys will be
mostly in the 60s and lower 70s with the lower deserts in the 80s.
There will also be west winds for the mountains and deserts with
gusts to 35 to 45 mph.

For Friday, the lower-level flow will go offshore with
strengthening high pressure aloft. Areas of northeast winds along
and below the coastal slopes of the mountains will gust to 30 to
40 mph. High temperatures on Friday will warm as much as 10 to 15
degrees with high temperatures ranging from the lower to mid 70s
near the coast to the upper 70s to mid 80s for the valleys and
inland Orange County with the lower deserts in the 80s.

&&

.LONG TERM (Saturday through Tuesday)...
Offshore flow with warming and gusty northeast winds will continue
into Saturday. High temperatures on Saturday will warm another few
degrees near the coast to 4 to 8 degrees inland with high
temperatures ranging from from the 70s near the coast to the 80s
for the valleys and inland Orange County with the lower deserts
in the upper 80s to mid 90s,

For Sunday, the coast will begin to cool with the mountains and
deserts continuing to warm. Cooling will spread inland on Monday
followed by slight warming on Tuesday and slight cooling on
Wednesday.

&&

.AVIATION...
010930Z...Coast/Valleys...Layers of cloud bases between 3500-9000
feet MSL, but with bases in RA dropping to as low as 1500 feet. RA
and lower cigs to move out from northwest to southeast 11-15Z.
Some cigs and isold -SHRA to linger in the foothills through 17Z.
Scatter out first at coast mostly by 18Z, inland by 20Z, but not in
foothills. Low clouds fill in once again gradually after 00Z and
eventually fill the coastal basin with bases 2000-3000 feet MSL
overnight into Thursday.

Mountains/deserts...Areas of higher terrain obscured through 16-18Z
along with RA through 15Z. Layered bases up to 12 kft MSL. Strong
westerly winds 30-40 knots with gusts 50 knots over mountain ridges,
through mountain gaps, and desert slopes today; gusts near 30 kts
possible VCTY KPSP/KTRM. MOD up/downdrafts in lee of mountains, and
areas of vis reduced to 2-5SM in BLDU in deserts.

&&

.MARINE...
No hazardous marine conditions expected through Thursday morning
and Friday through Sunday. Areas of northwest wind gusts to exceed
20 knots late Thursday in the outer waters.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory until 11 PM PDT Thursday for Apple and Lucerne
     Valleys-Coachella Valley-Riverside County Mountains-San
     Bernardino County Mountains-San Diego County Deserts-San
     Diego County Mountains-San Gorgonio Pass near Banning.

PZ...None.

&&

$$

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