Fallbrook, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

012
FXUS66 KSGX 140532
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
932 PM PST Sat Dec 13 2025

.SYNOPSIS...
High pressure will continue to dominate the region over the next
week, keeping high temperatures well above normal with minor day to
day changes. The marine layer remains very shallow, leading to low
clouds and fog near the coast, where the fog may be locally dense
over the next couple of nights/mornings.

&&

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

Satellite at 9 PM was showing areas of high clouds moving across the
area, with ground observations indicating areas of low clouds and
fog at the coast and portions of the western valleys. Areas of fog
are restricting visibility down to 0.5 mile in some locations. Patchy
dense fog is expected into Sunday morning with the highest
chances for dense fog are near higher coastal terrain and in the
western portions of the valleys. Highs on Sunday will still be
about 5 degrees above average near the coast, and 10 to near 20
degrees above average for areas further inland.

From Previous Discussion Issued at 2 PM December 13...

Monday and Tuesday...

The shortwave trough to our east will tighten the surface offshore
gradient some for Monday afternoon, with weak offshore winds
expected, primarily restricted to the main mountain passes.
Strongest wind gusts of 25-30 mph possible in these areas. The weak
offshore flow will also help clear the marine layer out earlier
Monday morning and allow temperatures to warm back up to 15-20
degrees above normal. Onshore flow resumes Tuesday but a meager
marine layer Tuesday morning keeps afternoon temperatures similarly
above normal as Monday`s.

Wednesday through Late Week...

Ensemble clusters continue to favor a generally zonal upper level
flow with broad ridging in place through some clusters feature
slightly stronger ridging. Regardless, this pattern will keep
temperatures slightly above normal, albeit less anomalous than
Monday/Tuesday...with no precipitation chances in sight. Higher
elevations, particularly the High Deserts could see elevated onshore
flow if the ridging isn`t as strong.

&&

.AVIATION...
140330Z...Coast/Valleys...Low clouds and FG have pushed into San
Diego County and will continue to spread both east and north into
Orange County. Clouds may filter up to 10 miles inland by 10z. Bases
are currently 700-900ft MSL and will fall closer to 400-700ft MSL by
06-10z. VIS 2-6SM for most locations but periods of 1/4SM-1SM
possible, especially for coastal terrain and valleys, primarily
after 10z. Clearing will occur for much of San Diego County 18-20z,
20-21z for Orange County, with stratus lingering at certain beaches
beyond this point. Low clouds with similar bases push inland again
as early as 00-02z Mon for SD County, and after 04z for Orange
County.

Mountains/Deserts...Clear skies and VFR conditions expected through
the TAF period.

&&

.MARINE...
Patchy low clouds with visibility generally above 1 nautical mile
will continue into early Sunday afternoon. Otherwise, no hazardous
marine conditions are expected through Thursday.

&&

.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...Zuber