344
FXUS66 KSGX 102034
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
134 PM PDT Mon Jun 10 2024

.SYNOPSIS...
Night and morning low clouds will continue west of the mountains
this week. Warmer across inland areas through Wednesday, with
slight cooling following on Thursday. Warmer this weekend.

&&

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

A 581 DM low is about 350 miles southwest of San Diego today and a
ridge is building across the Pacific Northwest. Low clouds have
managed to clear across most areas, with the exception of far
northern San Diego County into coastal Orange County. Temperatures
this afternoon are a few degrees warmer than yesterday, with the
mountains up to 10 degrees warmer. A warming trend starts today,
with highs reaching the upper-60s at the coast, the 70s to 80s
across the inland valleys as well as the mountains, the mid to
upper-80s in the Inland Empire, the mid-90s in the High Desert
and the mid-100s in the lower deserts. Inland areas will warm an
additional 2-5 degrees tomorrow, and little change is expected for
Wednesday.

The marine layer will become more shallow as height rises from the
building ridge to the north impede upon Southern California. Low
clouds won`t extend quite as far inland tonight into tomorrow
morning, with this more shallow trend continuing into Thursday.
The valleys should clear by late morning or early afternoon each
day, with less certainty on if/when the coast clears out. The
persistent marine layer will also continue to keep the coast
seasonably cool.

The 12z ensemble guidance suite has come into closer alignment on
the evolution of the upper low that is currently located to our
southwest: models show the low meandering off the coast of
northern Baja or Southern California through Wednesday before
becoming an open wave and moving inland Thursday into Friday. This
will lead to gusty winds over the mountains and desert slopes,
and slight cooling region-wide. After the low passes, a high
pressure system will promote warming again on Friday and Saturday.

&&

.AVIATION...
102000Z...Coast/Valleys...SCT to locally BKN conditions will
continue this afternoon near the coast, with bases mostly 1500-2500
ft MSL. BKN-OVC cigs will spread inland after 00Z Tue and only reach
the far west and south parts of the Inland Empire by 12Z Tue. Local
vis restrictions of 2-4 SM in BR/HZ near higher coastal terrain and
in the valleys on the edge of the cloud deck. Bases will be slightly
lower tonight, around 700-1200 ft MSL. There is a 40% chance of cigs
with bases below 1000 ft at KONT and an 80% chance at coastal TAF
sites from 11-16Z Tue morning. Low clouds should clear inland areas
16-18Z Tue and SCT out at the coast 18-20Z Tue. Moderate confidence
in cigs lingering at the immediate coast into Tuesday afternoon.

Mountains/Deserts...Occasional SCT clouds AOA 25000 ft and
unrestricted VIS through Tue.

&&

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

&&

.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...EA
AVIATION/MARINE...CO