Area Forecast Discussion
Issued by NWS San Diego, CA

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213
FXUS66 KSGX 271015
AFDSGX

Area Forecast Discussion
NATIONAL WEATHER SERVICE SAN DIEGO CA
315 AM PDT Sat May 27 2017

.SYNOPSIS...
High pressure aloft near the West Coast will bring an inland
warming trend through Memorial day with high temperatures warming
to a little above average. The marine layer will become not quite
as deep...but with night and morning low clouds and patchy fog
still extending into portions of the inland valleys for Sunday
and Monday mornings. A trough of low pressure near the West Coast
will bring cooling and a deeper marine layer 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...

.SHORT TERM (Today through Monday)...
High pressure aloft near the West Coast today...will move 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 warming through
Monday with high temperatures near average on Sunday and a little
above average on Monday.

Early this morning the marine layer is still near 3500 to 4000
feet deep with widespread stratus coverage over land areas from
the coast inland to the lower coastal mountain slopes. Some gaps
in the stratus coverage over the coastal waters are continuing to
close. The marine layer is expected to become a little less deep
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.

&&

.LONG TERM (Tuesday through Friday)...
A trough of low pressure will move inland along the West Coast on
Wednesday with some spread among the global models with the
details. Greater spread develops 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. Some slow inland warming and slightly shallower marine layer
are possible towards the end of next week.

&&

.AVIATION...
270935Z...Coast/Valleys...BKN-OVC stratus with bases 3500-4500 ft
gradually clearing 15-18Z. Stratus redeveloping along the coast
after 28/03Z and spreading into the valleys overnight. Bases will be
near 2000 ft MSL.

Mountains/Deserts...Coastal mountain slopes partially obscured in
clouds/fog through about 16Z. Otherwise mostly clear with
unrestricted vis through Sunday morning.

&&

.MARINE...
No hazardous marine weather is expected through Wednesday.

&&

.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...17
AVIATION/MARINE...SS



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