675
FXUS66 KSGX 012031
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
131 PM 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...

At 1 PM satellite imagery was showing patches of low clouds
lingering along the immediate coast, mainly in San Diego County,
with high clouds over the mountains and deserts. Real-time
observations were showing temperatures similar to a few degrees
warmer than this time yesterday in the deserts. Moderate to
locally major HeatRisk is expected in the deserts this afternoon.
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 through 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. By Monday, NBM chances for the low deserts to exceed 110
degrees begin to increase to around 40 percent. Similar chances for
Tuesday. By Tuesday, most locations are expected to see high
temperatures 2 to 5 degrees above average. 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...
012015Z....Coast/Valleys...Low clouds have cleared out
of all of the coastal TAF sites but are lingering across the beaches
of San Diego County this afternoon. These clouds will push back
ashore earlier than the last few nights, brining CIGs to KSAN and
KCRQ as early as 03z Wednesday, and eventually to KSNA by 09z. Bases
continue to be around 1000-1400ft MSL with about 10-15 miles of
inland extent. Clouds scatter back to the coasts by 16-18z Wednesday
morning.

.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. Strongest wind
gusts between 00-06z Wednesday, with strong winds waning and
becoming more restricted to susceptible mountain passes by 12z.
Otherwise, VFR conditions prevail through Wednesday afternoon.

&&

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

&&

.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