La Palma, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

397
FXUS66 KSGX 161557
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
857 AM PDT Mon Jun 16 2025

.SYNOPSIS...
Hot conditions look to continue through Wednesday for inland
locations. Gradual cooling expected Thursday into the weekend.
Patchy night and morning low clouds and fog are expected tonight
into Tuesday along the coast, with more widespread cloud coverage
that will gradually increase in depth Wednesday through the weekend.
Breezy west winds across the mountains and deserts each afternoon
and evening, strongest today.

&&

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

Hot conditions will continue today for inland areas, with
temperatures at 9 AM already running 3 to 7 degrees warmer than this
time yesterday for most locations. Widespread moderate HeatRisk will
impact the inland valleys, mountain foothills, and High Desert
today, with moderate to locally major HeatRisk in the low desert.
Make sure you`re staying hydrated and seeking shade if you`re
spending time outdoors. If possible, avoid strenuous outdoor
activity during the hottest part of the day (through 5pm). Most
model guidance is showing minimal changes in high temperatures
between today and Tuesday for inland Orange County, San Diego
valleys, and mountains. For inland Orange County and portions of the
San Diego valleys, how much marine layer cloud coverage develops
overnight will have an impact on how hot it gets Tuesday. Currently,
high resolution guidance keeps low cloud coverage quite patchy
overnight, so the forecast has been updated and is trending towards
the hotter end of the guidance. For the Inland Empire, temperatures
will see minimal changes through Wednesday, keeping highs between in
the upper 90s to just over 100 degrees.

A very gradual cooling is expected in the deserts for Tuesday into
the weekend. The exception is the High Deserts are expected to see a
degree or two of warming on Wednesday, before continuing their
cooling trend. Widespread moderate HeatRisk will continue through
Thursday for the High Desert and Friday for the low desert.

A passing weak area of low pressure will move across central
California today, which will strengthen the onshore pressure
gradient. That will bring breezy west winds to the desert mountain
slopes, below the passes, and into the deserts during the afternoons
and evenings. Strongest winds are expected today with gusts 30 to 45
mph, locally up to 50 mph through the San Gorgonio Pass.

Ensemble guidance is in good agreement that the ridge of high
pressure will get pushed east ahead of an incoming low pressure
system approaching the Pacific Northwest. That will bring widespread
cooling, a deeper marine layer, and increased winds over the
mountains into the deserts. Marine layer low clouds and fog are
expected to reach well into the valleys by the end of the week.
There is high confidence in dry conditions with this passing trough.
Near average temperatures will return by Friday, with below average
temperatures expected through the weekend.

&&

.AVIATION... 161530Z....Coast/Valleys...Except for patchy low clouds
along immediate coast through 19Z, conditions will be mostly clear
and VFR today through the evening. Areas of low clouds will
redevelop and push ashore after 04Z, but only into westernmost
valleys overnight. Bases will be around 400-600 feet MSL with
widespread vis 2-5SM, but near zero over higher coastal terrain and
western valleys. Scatter out Tuesday 15-16Z.

.Mountains/Deserts...Clear skies and unrestricted vis through
Tuesday morning. West winds 21-08Z with gusts 20-30 kts, locally
near 40 kts through the San Gorgonio Pass, leading to MOD UDDFS.

&&

.MARINE...
Wind gusts up to 20-25 kts possible in the outer waters this
afternoon and evening near San Clemente Island. Otherwise, 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...None.
PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE...MM