107
FXUS66 KSGX 011630
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
930 AM PDT Tue Jul 1 2025

.SYNOPSIS...
Minor cooling is expected each day through Thursday. A gradual
warming is expected Friday through the weekend. Night and morning
low clouds and fog are expected to remain persistent along the coast
and into portions of the valleys through the week.

&&

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

Low clouds made it into the western valleys overnight. Low clouds
are expected to clear to the coast through the morning, with low
confidence in complete clearing at the beaches today. Highs today
will be similar to a few degrees cooler than yesterday west of the
mountains. For the mountains and deserts, highs will be similar to a
few degrees warmer. Highs in the low deserts will still be 110 to
113 degrees today. Moderate to locally major HeatRisk is expected in
the deserts. It is recommended to be extra cautious if planning to
be outdoors, and be sure to stay hydrated to avoid any heat-related
illnesses.

A weak upper level low pressure system centered off the central
California coast will move slowly inland into central and southern
California on Wednesday, then weaken and move inland into Arizona on
Thursday. That will help spread cooling inland through Thursday.
High temperatures will gradually decrease each day, bringing
temperatures on Thursday down to 4 to 8 degrees below average for
the mountains and inland valleys. It will also pull mid to upper
level moisture into Southern California. This will result in areas
of high clouds over the mountains and deserts today and Wednesday.
Even with the influx in moisture, dry conditions are expected to
prevail.

For the 4th of July holiday through early next week, a slow warming
will occur but temperatures will remain within a few degrees of
average. By Monday, NBM chances for the low deserts to exceed 110
degrees begin to increase to around 40 percent. Marine layer low
cloud and fog coverage will remain persistent each night and morning
for the coast and into portions of the valleys with minor variations
in depth.

&&

.AVIATION...
011630Z....Coast/Valleys...Low clouds took a little bit longer to
clear this morning, but have been efficiently scattering out over
the last hours. Areas of low clouds will remain across portions of
the coast through the next hour until full scattering by 17-18z.
However, there is a 30-40% chance of SCT-BKN CIGs persisting at the
San Diego County beaches through the afternoon. Clouds with similar
bases push inland again after 03z Wednesday. Otherwise, localized
areas of FU/HZ near ongoing wildfires (VIS 1-3SM) possible in the
Inland Empire.

.Mountains/Deserts...West winds gusting 25-35 kt through the passes
and on the desert mountain slopes this afternoon and evening with
associated MOD UDDFS over and east of the mountains. Otherwise, VFR
conditions prevail through

&&

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

&&

.BEACHES...

Building southerly swell (190 degrees) of 3 feet at 14-15 seconds
will generate elevated surf of 3-5 ft with sets to 6 ft along
southerly facing beaches in addition to strong rip and longshore
currents at all beaches Friday and Saturday. Swell and surf will
begin to lower on 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/BEACHES...Munyan