Area Forecast Discussion
Issued by NWS San Diego, CA

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FXUS66 KSGX 250914
AFDSGX

AREA FORECAST DISCUSSION
National Weather Service San Diego CA
214 AM PDT WED MAY 25 2016

.SYNOPSIS...
Today will be breezy and cool with a low pressure trough moving
through Southern California. Light showers are possible in the
coastal basin this morning with isolated thunderstorms mainly in
the mountains this afternoon. Cool weather with a deep marine
layer will continue this week, but slightly warmer for the
holiday weekend.

&&

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

A few showers have developed within our deep and convective
marine layer this morning. This is in response to a low pressure
trough advancing into Southern California. This system has little
moisture to add to the marine layer, but will squeeze out some
light showers in the coastal basin this morning. It will also bring
colder air aloft this afternoon that will coincide with maximum
heating of the surface. This will create enough unstable energy
for a few thunderstorms today. These are expected mainly over the
mountains, but it`s not out of the question for far inland valleys
too. Strong winds will develop in the mountains and deserts. Local
gusts will exceed 40 mph and could produce pockets of blowing
dust in the desert. The trough exits east tonight and takes the
precip threat with it. The marine layer remains rather undaunted
by this brief encounter with unstable air. Low clouds will
continue to predominate nights and mornings in the entire coastal
basin through the holiday weekend. Some half hearted attempt at
higher pressure will result in temperatures getting close to
average over the holiday weekend. The models are beginning to hint
at a legit high pressure ridge next week for a more meaningful
warming trend as we head into June.

&&

.AVIATION...
250900Z...Coast/Valleys...SCT to BKN low clouds with bases 2000 to
4000 ft and tops to 6000 ft. Bases most persistent between 12-16z
this morning, and could temporarily lower to 1500 ft under scattered
rain showers. The chance of rain showers will come to an end this
afternoon. Partial clearing this afternoon, but the exact timing is
uncertain, but most likely to be between about 19-21z.

Mountains/Deserts...Coastal slopes below 6000 feet obscured at times
in low clouds, otherwise mostly clear. West winds with gusts of 30-
40 kts will produce weak to moderate up/down drafts over and east of
the mountains through tonight.

&&

.MARINE...
200 AM...Wind gusts to around 20 knots this afternoon and evening.
Otherwise, no hazardous marine conditions are expected through Sun.

&&

.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...MM
AVIATION/MARINE...JMB



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