743
FXUS66 KSGX 061824
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1124 AM PDT Sun Sep 6 2026

.SYNOPSIS...
Widespread mid to high level clouds and periods of light to locally
moderate precipitation will continue today. There is a slight (5-
10%) chance of thunderstorms, mainly over the San Bernardino
Mountains and High Desert this afternoon. Warming high and low
temperatures through the middle of next week. Slight chance of
mountain showers and thunderstorms each afternoon through the
middle of the week. Gradual cooling into next weekend.

&&

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

Widespread cloud coverage is being observed this morning associated
with moisture from Tropical Cyclone Marie. Light to locally moderate
showers have been observed across much of the area through the
morning, with the bulk of the rain at 11 AM north of San Diego
County. There remains a 5 to 10 percent chance of thunderstorms over
the San Bernardino Mountains and High Desert this afternoon. Current
forecast has an additional 0.30 to 0.50 inches of rain accumulating
over the San Bernardino Mountains, with an additional 0.05 to 0.15
inches elsewhere north of San Diego County. Less than 0.05 inches of
additional rain are expected for San Diego County.

Lingering moisture tomorrow and Tuesday will continue chances of
precipitation, mainly over the mountains. Afternoon shower and
potentially thunderstorm chances will continue into Thursday. A
ridge of high pressure will build from the south for the middle of
the week which will turn the upper level flow southeasterly.
Currently Wednesday looks like the most likely day for showers and
thunderstorms to develop over the mountains in the afternoon. Low
confidence in details surrounding rainfall rates at this time.
Shower and thunderstorm chances have decreased for Thursday, with
the potential for the ridge of high pressure moving right over
Southern California, which would result in a very stable air mass
aloft.

High temperatures Monday are expected to be 5 to 10 degrees
warmer than today, with less cloud coverage expected. High
temperatures will continue to increase into Wednesday for areas
west of the mountains and Thursday for the deserts. Above average
high and low temperatures can be expected for the majority of this
week. Widespread minor to moderate HeatRisk is expected for
inland areas Tuesday through Thursday.

&&

.AVIATION...
061800Z...Coast/Valleys/Mountains...Mid/high level clouds SCT-OVC
AOA 10,000-20,000ft will persist through the TAF period. Ongoing -RA
for Orange and Riverside counties, spreading into San Bernardino
County currently. Intermittent VIS down to 2-4SM with -RA. VCSH
elsewhere, clearing San Diego County over the next two hours.
Highest rain expected in SB Mountains. Generally light winds below
10 mph. BKN050 or lower with any -RA. Isolated TSRA over mountain
areas, especially in the SB mountains, through 00z Mon.
Precipitation will end after 03z.

Deserts...Mid/high level clouds SCT-OVC AOA 10,000-20,000ft will
persist through the TAF period. VCSH through 22z with instances of
-SHRA in the High Desert. Otherwise, VFR with no significant impacts
expected.

&&

.MARINE...
No hazardous marine conditions are expected through Thursday.

&&

.BEACHES...
A large south swell from Hurricane Marie is set to peak today into
Monday before gradually diminishing Tuesday. This will result in
elevated to high surf and strong rip and longshore currents at the
majority of beaches. Additionally, waves will occasionally run much
farther up the beach than expected, especially during increasing and
high tides.

For south and southwest-facing beaches, expecting high surf 6-10
feet. This includes Orange County and north San Diego County
beaches. For west-facing beaches, expecting elevated surf 4-7 feet.
This includes most of southern San Diego County beaches.

High surf combined with high astronomical tides 6.2 to about 6.8
feet will lead to tidal overflow and coastal flooding through
Tuesday during evening high tides, especially for south and
southwest-facing beaches as well as low-lying areas.

&&

.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 11 PM PDT Tuesday for Orange County
     Coastal Areas-San Diego County Coastal Areas.

     High Surf Advisory until 11 PM PDT Tuesday for Orange County
     Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE/BEACHES...Zuber

NWS San Diego (SGX) Office