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612
FXUS66 KSGX 282025
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
125 PM PDT Tue May 28 2024

.SYNOPSIS...
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Fairly seasonal conditions will continue into Wednesday, with a
slight warm up by Thursday and Friday for areas away from the
coast due to weak high pressure. With this warming, the marine
layer will shrink with some faster clearing each morning for
valleys with better chances for clearing at the beaches. Weak
troughing looks to come back into the picture by the weekend,
which will cool inland areas a few degrees along with a bit more
low cloud coverage nights/mornings west of the mountains.
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&&

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

Warm temperatures near 100 degrees are occurring across the lower
deserts from Palm Springs to Borrego Springs. GOES imagery shows
clouds sticking to the coast with subtle clearing starting to
begin across Orange County. West wind will pick up this afternoon
and evening across mountain passes into the deserts today with
gusts near 25-45 MPH. Today will be the windiest day in these
areas this week, slightly less so by Wednesday. The marine layer
depth will decrease slightly on Wednesday with subtle warming
inland and better chances for clearing at the beaches.

High pressure across northern Mexico will shift further north by
Thursday and Friday. This will shrink the marine layer even more
with slightly warmer temperatures inland. NBM probability points
to about a 30-40% chance in high temperatures over 105 degrees by
this time in the springs of Borrego and Palm. This will lead to
areas of moderate heat risk, so impacts will be felt to those
sensitive to heat or without proper cooling/hydration.

Heights will lower once again by the weekend with a few degrees of
cooling for inland locales, where the region will be near average
with breezy conditions for desert mountain slopes into adjacent
desert regions. With this will also come a slightly deeper marine
layer, with more low cloud coverage and patchy valley fog for
areas like the Inland Empire each night and morning.
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&&

.AVIATION...
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281940Z...Coast/Valleys...Limited or intermittent scattering is
expected at the immediate coast this afternoon. Low clouds with
similar bases/vis as last night, generally around 700-1400 FT MSL,
will spread back inland after 02Z and into portions of inland
valleys early Wednesday. Expect another slow round of clearing
Wednesday morning, generally 16-18z for inland areas and 17-19z for
the coast.

Mountains/Deserts...Areas of W-SW surface gusts 30-40 knots on
desert mountain slopes and locally into the deserts after 22Z.
Otherwise...SCT high clouds this afternoon, but generally clear
skies with unrestricted vis today and tonight.
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&&

.MARINE...
No hazardous marine conditions are expected through Saturday.
&&

.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...APR
AVIATION/MARINE...Adams