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283
FXUS66 KSGX 241054
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
354 AM PDT Fri May 24 2024

.SYNOPSIS...
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Cooling will continue through Saturday with gusty southwest to
west winds in the mountains and deserts with the strongest gusts
this afternoon and evening with the stronger gusts to 40 to 50
mph. Night and morning coastal low clouds will extend inland across
all of the valleys and onto the lower coastal slopes of the
mountains with slower daytime clearing for coastal areas. High
pressure to the south will bring warming for Sunday through
Thursday. The marine layer will become shallower with night and
morning coastal low clouds only extending inland into portions of
the valleys by the middle of next week.
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&&

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

.SHORT TERM (Today through Sunday)...
The marine layer remains around 3500 feet deep with coastal low
clouds extending inland across all of the valleys and onto the
lower coastal mountain slopes. The marine layer is expected to
deepen to around 4500 feet tonight with some patchy drizzle
possible for late tonight into Saturday morning.

The cooling trend will continue into Saturday with Saturday high
temperatures as much as 15 to 20 degrees below average for the
mountains and inland valleys. Gusty southwest to west winds for
the mountains and deserts will continue into Saturday. The
strongest winds are expected for this afternoon and evening with
the stronger gusts along and below the desert slopes of the
mountains to 40 to 50 mph. The strongest winds are expected in the
northern Coachella Valley below the San Gorgonio Pass with gusts
to 65 mph.

Sunday will be much warmer inland, as much as 10 to 15 degrees
warmer than Saturday for the mountains of Riverside and San Diego
Counties. High temperatures for the Inland Empire will be mostly
in the 70s with high temperatures for the lower deserts mostly in
the lower to mid 90s.
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&&

.LONG TERM (Monday through Thursday)...
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The greater warming of Sunday will continue on Monday followed by
slower warming for Tuesday through Thursday. With the warming,
high temperatures on next Thursday will be around 5 degrees above
average for the deserts and around average for the coast and
valleys, mostly in the 80s for the Inland Empire and 100 to 105
for the lower deserts. The marine layer will gradually decrease
in depth to 2000 to 2500 feet for Wednesday and Thursday with
night and morning coastal low clouds extending inland only into
portions of the valleys.
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&&

.AVIATION...
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240910Z...Coast/Valleys/Foothills...BKN-OVC with bases 1800-2500 FT
MSL extend through the foothills this morning. Locally reduced vis
where low clouds and terrain intersect. Partial clearing across
inland areas by 18z-21z Fri and across the coast 19z-22z Fri with
bases rising abv 2500 FT MSL. Low clouds spreading back inland Fri
evening.

Mountains/Deserts...FEW-SCT AOA 25,000 FT MSL through Fri night. W-
SW wind gusts of 25-40 knots over/east of mtns after 21z Fri,
strongest after 00z Sat. Locally reduced vis of 3-5 SM in local BLDU.
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&&

.MARINE...
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Northwest winds near 20 knots will occur in the outer coastal waters
each afternoon and evening through Sunday.
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&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
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CA...Wind Advisory from noon today to 2 AM PDT Saturday for San
     Gorgonio Pass Near Banning.

PZ...None.
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&&

$$

PUBLIC...17
AVIATION/MARINE...EA