6800ft. 
024
FXUS66 KSGX 120001
AFDSGX
Area Forecast Discussion
National Weather Service San Diego CA
501 PM PDT Fri Sep 11 2026
.SYNOPSIS...
A cooling and drying trend will occur across the region into the
weekend and early next week. This will be accompanied by a building
marine layer with clouds returning closer to the coastal areas each
night and morning. An area of high pressure may strengthen by the
end of next week, nudging temperatures back above average.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
...UPDATED AVIATION DISCUSSION...
High pressure continues to weaken over the region today with
stronger onshore flow seen at current observations. This has allowed
for a deepening marine layer, where some places along the coast saw
low clouds and patchy fog earlier this morning. Looking toward the
lunch hour, temperatures a relatively cooler with highs in the 70s
to near 90 west of the mountains. Elevated westerly winds will also
be felt across the mountains and deserts with wind gusts 20-40 MPH.
An area of low pressure off the west coast of British Columbia will
continue to push southward today, eventually moving into the Pacific
Northwest this weekend. This weather pattern will help bring in more
cooler air and greater extent to the marine layer into far western
valleys. We can expect to cool a few degrees each day with breezy
westerly winds across the mountains and deserts each afternoon and
evening. Temperatures will be near average by the weekend, with
highs dipping below average by next Monday and Tuesday. High
temperatures may stay below 90 degrees for areas west of the
mountains with highs closer to 100 degrees over the Coachella
Valley. Low temperatures will also begin to cool off through early
next week as well with lows in the 50s and 60s along and west of the
mountains and up in the high desert.
High pressure over the Southern Plains may expand further into the
desert southwest by the end of next week. The placement and strength
of this system is still uncertain, but many models are hinting that
another subtle warm up may take place by this time. NBM shows highs
approaching 100 across inland valleys with 70s and 80s closer to the
coast and across the mountains.
&&
.AVIATION...
120000Z...Coasts...Low clouds are beginning to reform over nearshore
waters late this afternoon. Clouds should move ashore starting 01-
02z Sat with bases around 600-1000 ft MSL. Clouds slowly move 10-15
miles inland overnight, likely rising above 1000 ft MSL sometime
Saturday morning. Minor vis reductions (1-5SM) expected along
elevated coastal terrain and locally into western valleys. Clouds
clear toward the coastline 16-18z with SKC expected for the
afternoon.
Otherwise, FEW clouds above 15 kft and VFR conditions through
Saturday afternoon.
&&
.MARINE...
West-northwest winds expected to gust up to 20 knots Saturday and
Sunday afternoons over outer coastal waters. Otherwise, no hazardous
marine conditions are expected through Wednesday.
&&
.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory until 8 PM PDT this evening for Orange County
Inland Areas-San Bernardino and Riverside County Valleys-
The Inland Empire-San Diego County Coastal Areas-San Diego
County Valleys.
Extreme Heat Warning until 8 PM PDT this evening for Coachella
Valley-San Diego County Deserts-San Gorgonio Pass near
Banning.
PZ...None.
&&
$$
PUBLIC...APR
AVIATION/MARINE...KW
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