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000
FXUS66 KSGX 251422
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
722 AM PDT Thu Apr 25 2024

.SYNOPSIS...
Gusty southwest to west winds; areas of night and morning drizzle or
light rain; and cooler conditions are expected through Friday. A
deep marine layer will result in night and morning low clouds
throughout much of the coastal basin for the next couple of days. A
gradual warming is expected over the weekend into early next week.

&&

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

Visible satellite at 7 AM was showing widespread cloud coverage
in the coastal basin, with mostly clear skies in the deserts.
Showers developed overnight, and are currently (as of 7 AM) moving
southeast across San Diego County. Rain has been light, with
0.01-0.05 inches of accumulation over the past 12-hours for the
coast and valleys. In the mountains accumulations have been a
little bit higher with 0.06- 0.08 inches of accumulation. Showers
are expected to taper off by mid-morning. The upper level pattern
stays relatively unsettled into Friday with periods of drizzle or
light rain expected each night and morning through Friday night.

Periods of gusty southwest to west winds will continue over the
mountains and into the deserts through Friday night. Over the past
24-hours, the top wind gusts have been recorded through and below
the San Gorgonio Pass into portions of the northern Coachella
Valley. The top gust so far occurred at Whitewater RAWS just
before 1 AM with a gust of 69 mph. Winds are expected to weaken
into this morning, before strengthening again this afternoon and
overnight. Peak gusts for this afternoon into early Friday morning
will be mostly 50 to 60 mph on the desert mountain slopes,
locally into the deserts. Local gusts up to 70 mph possible
through the San Gorgonio Pass near Whitewater. Gusty winds will
continue for Friday afternoon into early Saturday. There is a
potential for more widespread coverage of stronger wind gusts on
Friday as a low pressure system moves into the Great Basin and
east into the Four Corners region through early Saturday morning.
Gusts of 50 to 65 mph are expected. There will also be the
potential for gusts 70 to 75 mph in wind prone locations like
through the San Gorgonio Pass.

High temperatures today are expected to be a degree or two cooler
than yesterday near the coast and valleys, with highs 5 to 10
degrees cooler than yesterday in the mountains and deserts.
Widespread below average high temperatures are expected into
Saturday. By Sunday, highs will warm to near average, with some
locations still a degree or two cooler than average for this time of
year. Further warming is expected into early next week. By the
middle of next week, some uncertainty develops in the upper level
pattern. This introduces uncertainty into the temperature forecast,
with the potential for a few degrees of cooling. This uncertainty
also impacts the depth of the marine layer. Current forecast
reflects a shallower marine layer for early next week, slowly
deepening into the middle to end of next week.

&&

.AVIATION...
251445Z...Coast/Valleys/Foothills...OVC low clouds based from 2500-
3500 feet MSL and tops to 6000 feet will continue, along with
scattered -DZ or -SHRA dropping cigs to 2000 feet and vis to 3-5SM
with higher terrain obscured through 18Z. BKN briefly SCT low clouds
will prevail thereafter with bases 3000-5000 feet through 03Z. BKN-
OVC low clouds based around 2500-3500 feet MSL along with some
obscuration of higher terrain overnight into Friday.

Mountain Ridges/Deserts...Areas of west winds with surface gusts 25-
55 kt today and tonight. Occasional LLWS and rotors near lee slopes
and adjacent deserts, such as vcnty KPSP, along with MOD
up/downdrafts. Areas of reduced vis 2-5SM in BLDU in deserts.

&&

.MARINE...
Stronger winds and higher seas will generate hazardous boating
conditions Friday through early Saturday, especially beyond 15 NM
offshore. A few gales are possible Friday night near San Clemente
Island. The Small Craft Advisory contains the details. Otherwise, no
hazardous marine conditions are expected.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory until 11 PM PDT Friday for Apple and Lucerne
     Valleys-Coachella Valley-Riverside County Mountains-San
     Bernardino County Mountains-San Diego County Deserts-San
     Diego County Mountains-San Gorgonio Pass Near Banning.

PZ...Small Craft Advisory from 1 PM Friday to 7 AM PDT Saturday for
     Coastal Waters from San Mateo Point to the Mexican Border
     and out to 30 nm.

     Small Craft Advisory from 3 AM Friday to 11 AM PDT Saturday for
     Waters from San Mateo Point to the Mexican Border Extending
     30 to 60 nm out including San Clemente Island.


&&

$$

PUBLIC...CO
AVIATION/MARINE...Small