Oak Glen, California Weather Forecast Discussion

561
FXUS66 KSGX 301006
AFDSGX
Area Forecast Discussion
National Weather Service San Diego CA
306 AM PDT Tue Sep 30 2025
.SYNOPSIS...
A low pressure system moving inland along the West Coast will
bring cooling today with coastal low clouds extending well inland
and onto the lower coastal mountain slopes this morning as the
marine layer deepens. This will be followed by warming for
Wednesday and Thursday, but with high temperatures remaining below
average. Another low pressure system will move inland through
California on Friday with cooling of a few to around 5 degrees and
slight additional cooling for inland areas on Saturday. Then
mostly slight day to day differences for Sunday and Monday with
high temperatures remaining at least a few degrees below average.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
.SHORT TERM (Today through Thursday)...
A low pressure system moving inland along the West Coast will
bring stronger onshore flow and dry southwest flow aloft. It will
be cooler today with high temperatures as much as 5 to 10 degrees
below average for the inland valleys onto the lower coastal slopes
of the mountains. The marine layer is deepening and will deepen to
4000 to 4500 feet early this morning.
Satellite imagery shows patchier coverage of low clouds over the
coastal waters with more widespread coverage over the coast and
valleys onto the lower coastal slopes of the mountains. While the
marine layer has been deepening, cloud bases along the coast have
been increasing as well to mostly above 3000 to 3500 feet. Even
over land areas, coverage is less than uniform with limited
vertical extent to the clouds. This is less supportive for drizzle
with coverage of patchy drizzle reduced for early this morning.
For Wednesday and Thursday, the low pressure system will move
inland and weaken. High pressure to the south will bring warming
with the marine layer decreasing in depth. High temperatures will
warm a few degrees on Wednesday and a few more degrees on
Thursday, but with high temperatures still a few to around 5
degrees below average on Thursday. High temperatures on Thursday
will range from the lower 70s near the coast to the lower to mid
80s for the Inland Empire with the lower to mid 90s for the lower
deserts.
&&
.LONG TERM (Friday through Monday)...
The next low pressure system moving inland through California will
bring a few to around 5 degrees of cooling on Friday with high
temperatures another 5 degrees cooler for inland areas on
Saturday. With the cooling, high temperatures on Saturday for
inland areas will be as much as 5 to 10 degrees below average.
For Sunday and Monday, there is greater spread in the high
temperature guidance due to differences in the strength and
placement of low pressure over California and Nevada. The
calibrated deterministic NBM is slightly warmer on Sunday, then
slight cooler on Monday.
&&
.AVIATION...
300930Z....Coasts/Valleys...Low clouds based 2500-3500 feet MSL with
tops to 3800 feet will continue to fill the coastal basin this
morning. Scatter out expected 17-19Z. Low clouds to redevelop after
04Z this evening, but in patchy, random, and intermittent fashion,
and less extensive into the inland valleys by early Wednesday. Bases
should be 1200-2000 feet MSL.
Mountains/Deserts...Mostly clear and VFR conditions today and
tonight.
&&
.MARINE...
No hazardous marine conditions are expected through Saturday.
&&
.BEACHES...
South swell will continue to produce elevated surf and a high rip
current risk through this evening. Surf of 3-6 feet with sets 7 feet
expected on south facing beaches. Strong longshore currents will
impact all beaches. Surf will slowly diminish today and tonight.
More information can be found in the Beach Hazards Statement.
&&
.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through this evening for Orange County
     Coastal Areas-San Diego County Coastal Areas.
PZ...None.
&&
$$
PUBLIC...17
AVIATION/MARINE/BEACHES...MM

NWS SGX Office Area Forecast Discussion