991
FXUS66 KSGX 201326
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
626 AM PDT Sat Jun 20 2026

.SYNOPSIS...
Below average temperatures with limited marine layer low clouds
and fog this morning. Low clouds and fog return with more coverage
tonight into Sunday morning, spreading into portions of the
valleys. Gusty westerly winds expected in the mountains and
deserts this afternoon and evening. Warming trend expected Monday
through at least the middle of next week. Areas of major HeatRisk
possible for the deserts and moderate HeatRisk for inland Orange
County, valleys, and mountains mid next week. The marine layer
will become shallower next week, staying confined to coastal
areas.

&&

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

...Updated Aviation/Marine/Beaches Section...

This morning...There is a lot less low cloud coverage than at this
time yesterday, likely due to onshore pressure gradients trending
weaker. The low clouds will increase in coverage over the next 6
to 8 hours before clearing out, although they will likely remain
limited to the coastal areas and valleys of San Diego County.

Weak upper level troughing over the western states and onshore
flow will keep daytime temperatures near or several degrees below
normal through Sunday. The marine layer will remain relatively
deep with low clouds and fog spreading up to 20 miles inland
tonight into Sunday morning. The onshore flow will produce
westerly winds gusting 25-45 mph in the mtn passes and adjacent
desert areas this afternoon/evening and again Sunday
afternoon/evening.

A warming trend is expected for Monday through mid-week as high
pressure builds over the western states. Current model solutions
show that Wednesday will be the warmest day overall with high
temperatures 5 to 12 degrees above average and areas of moderate
HeatRisk away from the coast and areas of major HeatRisk in the
low desert. Some guidance is indicating an increase in moisture
aloft for the middle of next week. This could bring lower than
expected daytime temperatures and higher than expected overnight
low temperatures. The high pressure aloft will also result in a
shallower marine layer with overnight low clouds and fog mostly
restricted to the coastal areas.

Numerical model guidance is coming into better agreement with
respect to the pattern late next week. A majority of ensemble
members now show some weak troughing aloft approaching the west
coast. This could result in a slight cooling trend as we approach
the end of next week. By next Friday, daytime temperatures could
be near or a little below normal west of the mtns and 2-7 degrees
above normal in the deserts.

&&

.AVIATION...
200930Z...Coast/Valleys...Low clouds with bases 1500-2000ft MSL have
increased in coverage, filling into the San Diego County valley. Low
clouds will continue to spread north and spill into the Inland
Empire over the next few hours. Vis restrictions 1-5SM will be
possible where low clouds intersect terrain. Low clouds will scatter
out 16-19Z. Low clouds redevelop after 01Z Sunday beginning over
coastal SD County and filling into OC after 06Z.

Mountains/Deserts...VFR conditions expected through the TAF period.
Breezy westerly winds continue with gusts 30-45 kts, locally 50 kts
through mountain passes and into deserts but, will begin to ease
slightly over the next couple of hours. Local vis reduced in BLDU.
Moderate up/downdrafts in lee of mtns. Westerly winds 30-40 kts
redevelop through mountain passes into deserts after 18Z.

&&

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

&&

.BEACHES...
Elevated surf and strong rip currents continue through Sunday and
potentially longer. Surf of 3-5 feet with local sets to 6 feet are
expected at south-facing beaches. Expect locally hazardous swimming
conditions with high rip current and longshore current risk. See the
Beach Hazards Statement for more details.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through Sunday evening for Orange County
     Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

$$

PUBLIC...PG
AVIATION/MARINE/BEACHES...Villafane

NWS San Diego (SGX) Office