Loma Linda, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

566
FXUS66 KSGX 202027
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
127 PM PDT Tue May 20 2025

.SYNOPSIS...
Conditions will continue to warm through Wednesday for areas west of
the mountains and through Thursday for the deserts. The marine layer
will remain shallow and patchy, only impacting locations along the
coast through Thursday. Brief cooling trend expected Friday/Saturday
with a deeper marine layer. A slight uptick in westerly winds will
occur over the mountains and deserts Thursday and Friday afternoon
and evening. For early next week, minor daily temperature
fluctuations expected with a more persistent marine layer for the
coast and portions of the valleys.

&&

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

Temperatures at 1 PM were running 5 to 10 degrees warmer than 1 PM
yesterday. Satellite imagery continues to show a few patches of low
clouds lingering along the immediate coast in San Diego County. Low
cloud coverage may become a little more widespread for tonight into
Wednesday morning along the immediate coast but remain patchy in
coverage. Fog may be locally dense at times. Conditions on Wednesday
will be a few degrees warmer than today, with areas of moderate
HeatRisk expected in inland Orange County, the valleys, and low
deserts. Based on the current forecast, the Inland Empire and the
low deserts have the most widespread coverage of moderate HeatRisk.
High temperatures in the Inland Empire are expected to reach the mid
to upper 90s on Wednesday, with highs in the low desert expected to
be near 105 degrees. Chances of the Inland Empire exceeding 100
degrees on Wednesday is locally 15 to 20 percent in the warmest
locations, elsewhere chances are less than 10 percent.

Highs on Thursday will be a few degrees cooler than Wednesday west
of the mountains, with a couple additional degrees of warming in the
low desert. Chances of temperatures in the low desert exceeding 110
degrees are slim to none for Wednesday and Thursday. By Friday, all
areas will be 5 to 7 degrees cooler than Thursday as a low pressure
system moves across the Pacific Northwest. There is a less than 5
percent chance of high temperatures reaching or exceeding 105
degrees in the low desert on Friday. West of the mountains the
Inland Empire locally has a 20 to 30 percent chance of exceeding 90
degrees Friday with those chances confined to the typically hottest
locations, elsewhere chances are less than 10 percent. In addition
to cooler conditions, the afternoon sea breeze winds will be
enhanced on the desert mountain slopes into the deserts. Peak gusts
Thursday and Friday afternoon and evening are expected to be 30 to
40 mph, with local gusts up to 50 mph through passes.

Additional cooling is expected on Saturday with high temperatures
within a few degrees of average. Saturday high temperatures will
range from the mid to upper 60s near the coast to the upper 70s to
mid 80s for the Inland Empire with the mid 90s to around 100 for the
lower deserts. The marine layer will deepen to around 2500 feet for
the weekend. Night and morning coastal low clouds will spread inland
into portions of the inland valleys with slower or more limited
afternoon clearing near the coast. Sunday may warm slightly followed
by minor day to day differences through the middle of next week.
Night and morning coastal low clouds will continue to spread into
portions of the valleys each night.

&&

.AVIATION...
202030Z...Coast...Mostly clear skies through Wednesday. Except for
patchy low clouds and fog to redevelop after 06Z, with any cigs 200-
400 feet MSL and vis 0-5SM, most likely near KSAN and between 10-15Z
Wednesday.

Elsewhere...Clear with unrestricted vis through Wednesday.

&&

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

&&

.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