Tustin, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

899
FXUS66 KSGX 290536
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1036 PM PDT Sun Jun 28 2026

.SYNOPSIS...
Increased winds over the mountains and deserts at times through
Tuesday. A deep marine layer and well below average conditions
will prevail through the middle of the week. A gradual warming is
expected into the 4th of July holiday weekend, with conditions
warming to near or slightly above normal by next Sunday.

&&

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


...Updated Aviation Discussion Below...

There were a few drizzle reports last night and this morning, mainly
focused in coastal areas of northern San Diego County. The marine
layer deepened about 2300 ft from yesterday as the main core of the
trough of low pressure moved into the Great Basin. The overall
pattern will remain troughy through Friday, with another shortwave
expected to move through the mean flow early Tuesday. This will
increase the onshore pressure gradient again, maintaining a deeper
marine layer, elevating winds, and maintaining below average
temperatures. Additionally, patchy drizzle is possible Monday
night into Tuesday morning.

Winds over the mountains and into the deserts will remain elevated
today, but weaker than yesterday. Peak wind gusts yesterday topped
out at 72 mph at Cuyamaca Peak, 69  mph at White Water, and 56 mph
at Burns Canyon. Strongest winds today will be through the San
Gorgonio Pass and in the San Diego deserts with peak gusts 45 to 55
mph, with local gusts to 65 mph through the pass. Winds will weaken
into Monday morning. Winds for the mountains, deserts, and passes on
Monday evening into Tuesday look like they will likely peak at 35
to 50 mph. Strongest winds will be through west to east oriented
passes, like the San Gorgonio Pass.

Highs through Wednesday for inland areas will be 10 to 20 degrees
below average. There is good model agreement in the upper level
pattern through next Friday. For the 4th of July weekend, there is
more uncertainty in the upper level pattern. About half of the
ensemble solutions indicate ridging will develop over the western
United States although there are varying solutions as to where.
20 to 30 percent of ensemble solutions have the ridge in a
position to bring us more notable warming. Official forecast
follows the NBM for the end of the week which indicates a gradual
warming trend Thursday through the weekend. By next Sunday some
locations will start to see near or slightly above average
temperatures.

&&

.AVIATION...
290530Z....Coast/Valleys/Foothills...Low clouds based 2000-3000 ft
MSL are developing into the inland valleys and into Orange County.
Slow expansion of clouds to continue through 10z, covering most of
the coastal basin. Small chance (10%) for -DZ/BR along coastal
slopes. Vis 0-5SM along foothill terrain. Clouds scatter out 15-18Z
Mon.

Patchy low clouds at the coast become BKN-OVC beginning around 00-
02Z Tue, then expand into inland areas. While the main cloud base is
expected to be around 2500-3500 ft MSL, there may be FEW-BKN cloud
layers down to 1500 ft MSL, as well as patchy -DZ/BR.

.Mountains/Deserts...West winds gusting 25-45 kt on the desert
slopes with local gusts to 55 kt through the San Gorgonio pass
diminish overnight into early Mon. MOD up/downdrafts in lee of
mountains and pockets of BLDU. Winds re-strengthen Monday after 22Z,
with similar gusts as this evening.

&&

.MARINE...
No hazardous marine conditions are expected through Friday.

&&

.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 this evening for San Diego County
     Deserts.

     Wind Advisory until 2 AM PDT Monday for San Gorgonio Pass near
     Banning.

PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE...Westerink