000
FXUS66 KSGX 282052
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
152 PM PDT Sat Jun 28 2025

.SYNOPSIS...
High temperatures will warm a few to around 5 degrees this weekend
with high temperatures within a few degrees of average to around
5 degrees above average. High temperatures will then cool about 5
degrees through the middle part of next week with high
temperatures on Thursday around average to around 5 degrees below
average for the valleys. The marine layer lowers some this
weekend, but lifts again early next week, with night and morning
coastal low clouds spreading into the western valleys, clearing by
the mid-late mornings.

&&

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

A warm and dry weekend is on tap as the subtropical ridge axis
stretches over southern California. This is resulting in
temperatures across the inland valleys reaching the upper 80s to low
90s in the San Diego county valleys and the mid to upper 90s for
the Inland Empire, while the deserts see highs 105-110. While
these temperatures are only about 5 degrees above average for the
inland valleys, today/Sunday will still feature the hottest
temperatures of the week as the ridge retreats eastward. A fairly
stagnant upper level pattern is then established late Sunday with
the ridge now in place across the Four Corners and a cut-off low
centered about 200- 300 miles off the coast of California. This
pattern persists through mid-week when the trough slides eastward
over California on Wednesday into Thursday. Through this stagnant
pattern, the deserts stay hot Monday into Tuesday while the inland
valleys are a little cooler. Still, the deserts very slowly cool
Monday through Wednesday. The pattern begins to grow more
uncertainty Thursday through the end of the week. Within this
uncertainty, what appears more certain is the increase in
monsoonal activity, although staying east of SoCal.

&&

.AVIATION...
282100Z....Coast/Valleys...VFR conditions this afternoon. Low clouds
based 700-1200 ft MSL redevelop and push inland tonight up to 5-10
miles with similar or slightly lower bases generally after 04z.
Areas of 1-5SM visibility for western valleys and higher coastal
terrain. Locally below a mile 11-14z Sun. Clearing 15-17z.

.Mountains/Deserts...SW/W wind gusts 25-35 kts across the deserts
and mountain passes this afternoon and early evening leading to MOD
UDDFS at times. Winds weaken substantially by 06z Sunday.

&&

.MARINE...
Periods of gusty northwest winds around 15 to 18 knots possible in
the outer coastal waters near San Clemente Island this afternoon and
evening. Otherwise, no hazardous marine conditions are expected
through Wednesday.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

$$

PUBLIC...Munyan
AVIATION/MARINE...Westerink