DesertWeather.com

456
FXUS66 KSGX 300452
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
952 PM PDT Sun Mar 29 2026

.SYNOPSIS...
One more day of widespread record breaking temperatures today with
highs 15 to 20 degrees above average for inland locations. Cooler,
windier, and cloudier conditions expected for the middle of week.
Slight chance (15-20 percent) of light precipitation on Wednesday
for areas along and west of the mountains. Drier and warmer
conditions for the end of the week with potential for Santa Ana
winds.

&&

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

...UPDATED 06Z AVIATION/MARINE DISCUSSION BELOW...

Visible satellite at 10 AM was showing a fog bank along the
southern Orange County beaches, extending south towards Mission
Beach in San Diego County. Lifeguards have reported visibility of
1/8 to 2 miles where the clouds are reaching land. Visibility
should improve by later this afternoon but areas of low clouds and
fog are expected redevelop overnight into Monday morning. One
last day of record breaking temperatures for inland locations can
be expected today. By Monday the high pressure aloft will weaken
enough to kick off a cooling trend through mid-week. Highs Monday
will be 5 to 10 degrees cooler than Sunday for inland locations.

Weak troughing over the US West Coast will continue to cool
conditions back to near seasonal average by Wednesday. A few
additional degrees of cooling on Thursday will make it the coolest
day of the week for most locations. Widespread cloud coverage can be
expected for the middle of the week. Westerly winds will increase
over the mountains and into the deserts in the afternoons and
evenings Tuesday through Thursday. Strongest winds are expected
Wednesday and Thursday with peak gusts of 40 to 55 mph.

Precipitation chances on Wednesday are holding steady at around 15
to 25 percent chance of measurable rain, with the highest chances on
the coastal slopes of the mountains. The track of the trough will
keep the bulk of the moisture to our north. Rainfall totals for the
coast and valleys will be 0.10" or less, with the coastal slopes of
the mountains having a 20 to 25 percent chance of rainfall totals
exceeding 0.10".

Once the aforementioned low is to our east, the majority of global
model ensemble solutions show it digging south into the Great Basin
Friday and Saturday. This would turn the pressure gradient offshore,
bringing chances of Santa Ana winds, dry air, and another uptick in
temperatures west of the mountains. While most guidance is in
agreement on this general pattern, there remain differences in how
far south the low will dig and how fast it will continue to move
east. Both of those factors will have an impact on the strength and
duration of Santa Ana winds that develop. Latest guidance from the
CW3E WRF ensemble has a 60 to 80 percent chance of a weak Santa Ana
wind event Friday and Saturday, with a 40 to 60 percent chance of a
weak to moderate Santa Ana wind event.

&&

.AVIATION...
300450Z...Low clouds are beginning to filter in along the coast with
bases at 500ft MSL. Low clouds are still expected to slowly fill in
now through Monday morning, pushing inland 5-10 miles from the
coast. Bases near 300-700ft MSL with lower visibilities in fog on
higher coastal terrain. Low clouds will begin to clear after 17Z-19Z.

Otherwise, VFR conditions prevail. Clouds AOA 20,000ft MSL will
increase in coverage through the period.

&&

.MARINE...No hazardous marine conditions expected through Wednesday.
Northwest winds increase Thursday to near 20 kts across all marine
areas.

&&

.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...Villafane