408
FXUS66 KSGX 152040
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
140 PM PDT Sat Jun 15 2024

.SYNOPSIS...
A cooling trend will occur after today`s warm temperatures across
the region, as a trough to the north brings greater influence. As
the trough pushes into our area, we can expected near to slightly
below average temperatures and greater cloud coverage west of the
mountains. A ridge of high pressure will come back to the region
by the end of the week, providing warmer weather.

&&

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

High pressure over the southwestern U.S. is leading to another day
of heat across the deserts. Temperatures are reaching near the 110
degree mark early this afternoon and will sneak up a bit more over
the next few hours. A trough over the Pacific Northwest will
deepen over the West Coast by Sunday and Monday. This will lead to
greater onshore flow, cooling inland areas by 5 to 10 degrees by
tomorrow. No matter how hot it gets, remember that the sun angle
is more direct in the month of June, so keep that sunscreen and
water handy!

Low clouds will once again impact areas near the coast
by Sunday morning as the marine layer slowly deepens, but will
still be thin enough to lead to patchy fog (locally dense). This
onshore push will also provide increased winds across the
mountains and deserts. NBM probabilities paint a moderate to high
chance in seeing wind gusts over 30 MPH for these areas, best
chances in places along Interstate 10 in the San Gorgonio Pass and
along Route 78 in the Anza-Borrego Desert.

The troughing pattern will stay in place through around Thursday
with minimal temperature changes and low clouds forming each night
and morning west of the mountains. Ensemble guidance is in
agreement on ridging moving back into the region by later next
week. This will bring more warmer weather with a shallower marine
layer staying near coastal areas.


&&

.AVIATION...
152030Z...Coast/Valleys...Mostly clear skies will prevail with
mostly unrestricted VIS through this evening, except for patchy BKN
stratus at the beaches with bases 600-1000 ft MSL, mostly
diminishing by 22Z. Stratus will be delayed tonight but spread up to
20 miles inland after 07Z Sun with bases 700-1100 ft MSL and tops to
1300 ft MSL with an increasing trend in cloud base height,
especially after 14Z Sun. Local VIS 1-3 miles in BR will occur 08Z-
15Z Sun mainly in the coastal valleys. Stratus will clear much
slower Sun, mostly 17Z-20Z.

Mountains/Deserts...SKC with unrestricted VIS will continue through
Sun. Areas of wind gusts 25-35 kt from the west will occur on the
desert mountain slopes and into the deserts from 21Z today through
Sun, along with weak to MOD UDDFS. PSP could have gusts to 25 kt
from 23Z today through 04Z Sun.

&&

.MARINE...
Northwest winds may gust to around 20 knots at times in the outer
waters near San Clemente Island each afternoon and evening through
Monday. Otherwise, no hazardous marine conditions are expected
through Thursday.

&&

.BEACHES...
A combination of a west swell of around 6 feet/10 seconds (outer
waters) and south swells of around 2 feet/14 seconds becoming 18
seconds Monday will bring surf of 3-6 feet along with a high rip
current risk through Monday. The surf and rip current risk will
gradually lower around Tuesday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through Monday evening for Orange County
     Coastal Areas-San Diego County Coastal Areas.

     Heat Advisory until 8 PM PDT this evening for San Bernardino and
     Riverside County Valleys-The Inland Empire.

     Excessive Heat Warning until 8 PM PDT this evening for Coachella
     Valley-San Diego County Deserts-San Gorgonio Pass Near
     Banning.

PZ...None.

&&

$$

PUBLIC...APR
AVIATION/MARINE...Maxwell