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193
FXUS66 KSGX 072032
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
132 PM PDT Fri Jun 7 2024

.SYNOPSIS...
There will be a slow cooling trend through Sunday. Minor
fluctuations in daily temperatures and marine layer depth then
follow for much of next week. The marine layer will mostly
fluctuate between 2000 and 2500 feet deep, keeping coastal areas
cooler with night and morning coastal low clouds extending inland
into portions of the valleys. There will also be slightly stronger
onshore flow this weekend, with gusty southwest to west winds for
the mountains and deserts each late afternoon and evening.

&&

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

Low clouds continue to linger over and near the immediate coast
as of 1 PM PDT this afternoon. The 12z Miramar sounding indicated
a roughly 9-10C low-level inversion along with a saturated layer
from near the surface to roughly 2000 FT MSL, likely the main
culprits for the slow clearing yet again today. An upper level low
is also sitting off the southern Baja coast, acting to send some
high-level clouds into the deserts of SoCal. High pressure over
the western US will weaken through the weekend and the current
Baja low will open up into a wave and move inland, while another
low pressure system forms offshore. There will accordingly be a
slight and gradual cooling trend this weekend, generally on the
order of 2-5 degrees each day for most locations. Highs will flip
to being several degrees cooler than seasonal normal for areas
west of the mountains, while the deserts slowly fall back to
seasonal average by Sunday and Monday.

Marine layer clouds will cover much of the coastal basin well
into the late mornings and afternoons (location dependent) each
day through the weekend. The developing low off the SoCal/northern
Baja coast this weekend will maintain onshore flow through next
week, which will support a deep marine layer each day and will
also lead to gusty winds over the mountains and deserts each
afternoon and evening. The strongest gusts are expected in the
northern Coachella Valley below the San Gorgonio Pass, with gusts
to around 45-55 mph. Wind gusts of 30-40 mph can be expected
elsewhere for the desert mountain foothills.

The weak upper low off the SoCal/northern Baja coast then looks to
remain in place for much of next week as a blocking pattern sets
up over the Eastern Pacific/NW Mexico, perhaps eventually opening
up into a wave and moving inland sometime around Thursday or
Friday of next week. Very minor fluctuations in temperatures and
marine layer depth is expected during this time, so an abundance
of June Gloom and slightly cooler temperatures look likely for
next week.
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&&

.AVIATION...
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071935Z...Coast/Valleys...Low clouds cover most of the coastal areas
this afternoon, with CIGs at coastal TAF sites. Bases are 900 to
1100 ft MSL with tops to 2000 ft MSL. Low clouds will spread inland
again after 00Z with slightly higher bases and tops, filling the
coastal basin by 13Z Saturday. Higher terrain obscured with VIS 1-
3SM in fog where clouds and terrain intersect. Expect inland
clearing 16Z-18Z Sat and partial clearing at the coast 18Z-21Z Sat.

Elsewhere...FEW-SCT250 and unrestricted VIS through Saturday.
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&&

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

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Excessive Heat Warning until 9 PM PDT this evening for Apple and
     Lucerne Valleys-Coachella Valley-San Diego County Deserts-
     San Gorgonio Pass Near Banning.

PZ...None.

&&

$$

PUBLIC...Adams
AVIATION/MARINE...PG