-- Discussion containing changed information from previous version are highlighted. --
912
FXUS66 KSGX 110413
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
913 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...
-- Changed Discussion --
FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

Evening update...
Orange County manages to remain mostly clear this evening, but low
clouds have pushed into the valleys in San Diego after a day of
actually clearing at the coast. The 00Z KNKX sounding shows a
marine inversion based near 2100 ft MSL, down around 500 ft from
this morning. Low clouds will not extend as far inland tonight
with the shallower marine layer in place. No big changes to the
forecast this evening with June remaining gloomy.

Previous discussion...
Inland areas will warm an additional 2-5 degrees tomorrow, with
highs generally around 3-5 degrees below normal for the coasts and
valleys and 5 to 10 degrees above normal in the mountains and
deserts. Little change is expected for Wednesday.

The marine layer will become more shallow as height rises from the
building ridge to the east 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.
-- End Changed Discussion --


&&

.AVIATION...
-- Changed Discussion --
110335Z...Coast/Valleys...BKN-OVC cigs will continue to spread
inland this evening 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.
-- End Changed Discussion --

&&

.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...SS/EA
AVIATION/MARINE...Suk