Aliso Viejo, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

691
FXUS66 KSGX 041917
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1217 PM PDT Sat Jul 4 2026

.SYNOPSIS...
High clouds today and tonight with clear viewing conditions for
firework shows. Slow warming trend through Monday with lingering
moisture before more substantial warming and a shallower marine
layer for next week. Minor to moderate HeatRisk returns for the
inland areas and deserts next week.

&&

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

A very light band of rain showers moved through Orange County and
far northern San Diego county this morning, but little to no
accumulation was recorded. The morning sounding showed ample
moisture in the mid and upper levels, evident with the ongoing high
cloud cover we have today region-wide. The high clouds also
helped to push out our marine layer, which eroded before it was
able to make it very far inland this morning. While high clouds
will prevail today, no further rain showers are expected for
anywhere outside of the highest points of the San Bernardino
Mountains, which have a 10-15% chance to briefly see some light
rain early this afternoon.

Conditions for firework viewing for coastal cities tonight will be
quite favorable, as the marine layer will struggle to move back in
early this evening, likely not filling in until closer to 10PM-
midnight. For the deserts, periodic gusty winds at or above 15 mph
this evening may impact things some, but winds should
significantly weaken for everywhere but the mountain passes and
desert slopes by 9PM. As mentioned before, no precipitation is
expected for fireworks viewing. Inland valleys and the IE may be
more prone to lingering air pollution from fireworks, with further
information found in the Air Quality Alert from the SCAQMD.

After today, weak troughing will hold in place while high pressure
begins to build over the Four Corners. Temperatures will warm ever
so slowly through Monday while low level moisture hangs around,
with more noticeable warming in the deserts. By Tuesday, the
thermal ridge axis will pivot with high pressure spreading into
Southern California, and a more substantial warm up is expected by
mid week. The marine layer will become more shallow, allowing
even the coastal valleys to warm. Temperatures peak
Wednesday/Thursday as the high becomes elongated over the
Southwest and minor to moderate HeatRisk returns for the deserts
and inland areas through the end of the week. If you work
outdoors, make sure to have plenty of water and take frequent
breaks! Friday and beyond, an approaching low off the coast of CA
should begin to push the high back towards the Four Corners,
hopefully allowing for at least a subtle cooldown for next
weekend.

&&

.AVIATION...
041730Z....Coast/Valleys...A few low clouds have been drifting in
with bases 1,000-1,500ft MSL with the main cloud deck sitting around
9,000-12,000ft MSL. These mid layer clouds are expected to continue
through most of the period but, clear just enough along the coast to
allow low clouds to form with bases 800-1,500ft MSL after 05-06Z.
Low clouds clear 17-18Z Sunday.

Otherwise...SCT-BKN high clouds lift slightly to AOA 15,000 feet MSL
with coverage beginning to decrease late this evening. Local and
brief 4-6 mi vis restrictions 04-07Z will be possible due to
fireworks smoke this evening.

&&

.MARINE...
No hazardous marine conditions are expected through next Thursday.

&&

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

&&

$$

PUBLIC...Zuber
AVIATION/MARINE...Villafane