Area Forecast Discussion
Issued by NWS San Diego, CA

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FXUS66 KSGX 272022
AFDSGX

Area Forecast Discussion
NATIONAL WEATHER SERVICE SAN DIEGO CA
122 PM PDT Sat May 27 2017

.SYNOPSIS...
A warming trend for inland areas will continue through Memorial
day with high temperatures becoming a little above seasonal
averages. The marine layer will become shallower...but with night
and morning low clouds and patchy fog still extending into
portions of the inland valleys for Sunday and Monday mornings. A
cooling trend with a deeper marine layer will return for the
middle part of next week. Slow inland warming and a slightly
shallower marine layer are possible towards the end of next week.

&&

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

This afternoon...a few patches of low clouds still linger near the
beaches. Sfc pressure gradients are trending weaker but remain
strong enough onshore to produce a sea breeze that reaches
portions the inland valleys. Temperatures at the coast are
generally near or a few degrees lower than this time yesterday
while inland temperatures are generally higher.

Through Monday... High pressure aloft over the West Coast...will
shift slowly inland on Sunday...then begin to weaken on Memorial
Day as a trough of low pressure over the eastern Pacific moves
toward the West Coast. Inland high temperatures will slowly
increase through Monday, with high temperatures near seasonal
averages on Sunday and a little above seasonal averages on Monday.
As heights increase aloft, the marine layer is expected to become
a little shallower through Monday...but still deep enough for
night and morning coastal low clouds and patchy fog to extend into
portions of the inland valleys for Sunday and Monday mornings.

Tuesday through Friday... A trough of low pressure will move
inland along the West Coast on Wednesday. On this, the numerical
models are in general agreement with some differences in the
details. Greater differences in solutions develop from Thursday
into next weekend with periods of weak high pressure or weak low
pressure aloft that may spread across Southern California. Inland
cooling and deepening of the marine is expected for the middle
part of next week. The models that previously indicated a slight
chance for showers on Wed have now adjusted their solutions to
show drier conditions. Some slow inland warming and slightly
shallower marine layer are possible towards the end of next week.

&&

.AVIATION...
272000Z...SKC and light winds will prevail through 03Z Sunday for
all areas. After 03Z, low clouds with bases near 2,000 ft msl will
redevelop over the coast and valleys, while the rest of the region
remains predominantly SKC. Ceilings are expected and KSAN, KSNA and
KCRQ overnight. Clearing to the coast is expected by 18Z Sunday.

&&

.MARINE...
Quiet weather will prevail through Memorial Day and into late next
week, with 2-4 ft seas and northwest winds near 10 kts. Brief
periods of stronger winds 15-20 kts will be possible each afternoon
and evening outside of 25 nm. All and all, it looks like quality
boating conditions for the holiday weekend.

&&

.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...PG
AVIATION/MARINE...BA



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