Area Forecast Discussion
Issued by NWS San Diego, CA

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FXUS66 KSGX 241126
AFDSGX

AREA FORECAST DISCUSSION
National Weather Service San Diego CA
426 AM PDT TUE MAY 24 2016

.SYNOPSIS...
A pair of upper disturbances within the broad trough of low
pressure over the western states will bring a few light showers
early this morning and again late tonight into early Wednesday for
coastal areas to the coastal mountain slopes...with a slight
chance of thunderstorms near the mountains Wednesday afternoon. A
deep marine layer through mid week will become a little less deep
for late in the week through early next week with areas of night
and morning low clouds and patchy fog extending into the far
inland valleys and sometimes the lower coastal mountain slopes.
Well below average high temperatures for far inland areas will
warm slowly for Thursday and Friday...cool slightly for the
weekend...then resume warming early next week.

&&

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

A broad trough of low pressure remains across the western states.
Within this broad trough of low pressure one shortwave is moving
inland through central California today with a second moving
inland through Southern California on Wednesday. A few light
showers have been spreading inland into far southern
California...mainly near the coast of Orange and San Diego
Counties and near the coastal slopes of the San Bernardino County
mountains. Similar conditions are expected for late tonight into
early Wednesday morning. As the coldest mid level air moves across
Southern California Wednesday...there is a slight chance of
thunderstorms near mountains...inland valleys...and upper deserts
for Wednesday afternoon. A deep marine layer will continue and
high temperatures Will remain near average near the coast...to
around 15 degrees below average in the deserts through Wednesday.

The trough of low pressure over the West will weaken a little
across Southern California for late in the week into next weekend.
Inland high temperatures will warm slowly for Thursday and
Friday...cool slightly for the weekend...then resume warming early
next week. Warming aloft will result in a stronger marine
inversion for Thursday into early next week for greater
persistence to the night and morning coastal low clouds. The
marine layer will remain fairly deep...sufficiently deep for low
clouds to extend into the far inland valleys...if not the lower
coastal mountain slopes at times.

Onshore flow will continue to bring periods of gusty west winds to
the mountains and deserts each late afternoon through
evening...mostly below advisory strength.

&&

.AVIATION...
240900Z...Coast/Valleys...Low clouds will fill the coastal basin
this morning through 18z. Bases will be vary between 2000-3500 feet
msl with tops around 6000 feet. Visibility below 3SM is likely where
clouds and terrain intersect. Scattered drizzle or light showers are
possible between 11-16z. Mainly scattered clouds for 18-01z. After
01z low clouds will gradually gather once again in the coastal basin
with similar bases and tops.

Mountains/Deserts...Coastal slopes below 6000 feet locally obscured,
otherwise mostly clear. West winds with local gusts of 30-40 mph
will produce weak to moderate up/down drafts over and East of the
mountains today through tonight.

&&

.MARINE...
200 AM...Wind gusts near 20 knots in the outer waters during the
evenings through Thursday. Otherwise, no hazardous marine weather is
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...17
AVIATION/MARINE...MM


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