476
FXUS66 KSGX 310950
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
250 AM PDT Fri Jul 31 2026

.SYNOPSIS...
Strengthening high pressure will bring warming into the weekend. High
temperatures will be 8 to 12 degrees above average for inland
areas during the weekend with moderate to major HeatRisk except at
the beaches and for the highest elevations in the mountains. High
temperatures will slowly cool early next week with some increase
in humidity for inland areas during the middle and latter part of
next week. Night and morning low clouds will spread into coastal
areas with the marine layer a little shallower over the weekend.

&&

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

.SHORT TERM (Today through Sunday)...
High pressure will continue to strengthen over southern California
through Saturday, then begin to slowly weaken into early next
week. High temperatures will continue to warm through Saturday
with Saturday high temperatures around 5 degrees above average
near the coast to 8 to 12 degrees above average farther inland.
High temperatures on Saturday will range from the upper 70s to mid
80s near the coast to 100 to 110 for the Inland Empire with 115 to
120 for the lower deserts. High temperatures on Sunday will begin
to cool a few degrees.

Nights will be warmer for the weekend, mostly in the mid 60s to
lower 70s for the coast and valleys, in the 70s to around 80 for
the Apple and Lucerne Valleys and for mountain areas below 5500
feet, and in the upper 80s to mid 90s for the lower deserts.

The HeatRisk will peak on Saturday with widespread moderate or
greater HeatRisk except at the beaches and for mountain elevations
above 8000 feet. There will be moderate to major heat risk for
the valleys and for mountain elevations below 5000 feet with major
to locally extreme HeatRisk for the deserts.

&&

.LONG TERM (Monday through Thursday)...
The slow cooling trend will continue for Monday and Tuesday with
some model differences for Wednesday and Thursday with the
strength and placement of the high across the central and
southern Rockies westward to California. High temperatures for
next Wednesday will be generally within a few degrees of average
near the coast to 4 to 8 degrees above average for inland areas.
High temperatures for next Wednesday will range from the mid 70s
to lower 80s near the coast to the mid 90s to 105 for the Inland
Empire with 110 to 114 for the lower deserts.

Low temperatures will cool a few degrees on Monday and again on
Tuesday, then change little for Wednesday and Thursday. Low
temperatures on Wednesday will be mostly in the 60s and lower 70s
for the coast and valleys, in the 70s for the Apple and Lucerne
Valleys, and in the mid 80s to lower 90s for the lower deserts.

There will be moderate HeatRisk for next Wednesday for the inland
valleys and mountain elevations below 5500 feet with moderate to
major HeatRisk for the deserts.

Depending on the placement of the high, there could be some
increase in moisture from the east during the latter half of next
week. Through Friday of next week, NBM chances for measurable
precipitation are greatest over the mountains for next Thursday
afternoon at 10 to 15 percent.

&&

.AVIATION...
310600Z....Coast/Valleys...Low clouds based around 800-1200ft MSL
continue to spread up to 15 miles inland by 14z. VIS 5- 6SM for
inland spots with HZ and 2-6SM where clouds intersect terrain and
in some valleys. Scatter back towards the coast by 16- 18z, with
mostly SKC for the afternoon. Very patchy low clouds develop again
after 03z Sat, but don`t look to move inland or impact TAF sites
until later, closer to 09-12z, with intermittent CIGs. Bases will
be at or below 1000ft MSL.

Mountains/Deserts...SKC and VFR through Friday evening. FEW-SCT
high cu AOA 20,000ft MSL possible.

&&

.MARINE...
No hazardous marine weather is expected through Wednesday.

&&

.BEACHES...
A southerly swell from Hurricane Genevieve will continue to generate
elevated surf through Friday before diminishing over the weekend.
Surf of 4-7 feet with sets up to 9 feet for south and southwest
facing beaches. This will create conditions hazardous for
inexperienced swimmers. In addition, high tides each evening will
exceed 5 feet. The combination of high tides and high surf increases
the risk of coastal flooding. Further information on all these
hazards is found in the Coastal Hazard Message.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Coastal Flood Advisory until 3 AM PDT Saturday for Orange County
     Coastal Areas-San Diego County Coastal Areas.

     High Surf Advisory until 5 PM PDT Saturday for Orange County
     Coastal Areas-San Diego County Coastal Areas.

     Heat Advisory from 10 AM this morning to 8 PM PDT Sunday for
     Orange County Coastal Areas-San Diego County Coastal Areas.

     Extreme Heat Warning until 8 PM PDT Sunday for Apple and Lucerne
     Valleys-Riverside County Mountains-San Bernardino and
     Riverside County Valleys-The Inland Empire-San Diego County
     Mountains.

     Extreme Heat Warning from 10 AM this morning to 8 PM PDT Sunday
     for Orange County Inland Areas-San Diego County Valleys-
     Santa Ana Mountains and Foothills.

     Heat Advisory until 8 PM PDT Sunday for San Bernardino County
     Mountains.

     Extreme Heat Warning until 8 PM PDT Monday for Coachella Valley-
     San Diego County Deserts-San Gorgonio Pass near Banning.

PZ...None.

&&

$$

PUBLIC...17
AVIATION/MARINE/BEACHES...Zuber

NWS San Diego (SGX) Office