Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 182040
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
140 PM PDT Fri Aug 18 2017

.SYNOPSIS...
Fair and mild weather will continue this coming week, with coastal
clouds extending into valleys during nights and mornings. Monsoon
moisture will bring a slight chance of showers and thunderstorms
to the mountains and desert late Sunday and Monday.

&&

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

Sunny skies abound this afternoon, but there are a few cumulus
clouds over the San Bernardino Mountains. A weak low pressure
trough spinning off the California coast will deepen slightly
this weekend. This will deepen the marine layer, allowing coastal
clouds to extend just a little farther inland for Sunday and
Monday. At the same time, the southerly flow on the east side of
the trough will draw monsoon moisture into southeast California.
So you`ll see some afternoon cumulus over the mountains and
deserts. The latest model runs, which now include higher
resolution models, are pointing to at least a slight chance of
showers and thunderstorms late Sunday. A plume of moisture is
shown by models to move from Sonora into Southern California
mainly north of San Diego County Sunday night and Monday. That
will increase the chance of showers and thunderstorms Monday,
even possibly Sunday night through Monday morning in the desert.
It looks like the marine layer will extend the coastal clouds
farthest inland on Monday, but all but the coast should clear out
for best eclipse viewing (provided the higher monsoon cloudiness
doesn`t block the view). For those who like mild summer weather,
enjoy this coming week as it appears temperatures will come in a
little below average each day next week.

&&

.AVIATION...
182030Z...Coast/Valleys...Light westerly sea breezes this afternoon
and evening through and 03Z. Low clouds with bases near 1500 ft msl
will slowly return to areas within 25 miles of the coast after 03Z
Saturday. Look for the low clouds to clear to the coast between 15Z
and 17Z Saturday, with patchy low clouds lingering over the coastal
waters thereafter through about 03Z Saturday evening.

Mountains/Deserts...Mostly Clear skies and unrestricted visibility
will continue through this weekend.

&&

.MARINE...
No hazardous marine weather is expected through Tuesday night.

&&

.BEACHES...
A moderate period south swell (2-3 ft at 200 degrees) will continue
through this weekend. This swell will increase surf, with sets to 5
ft possible north of Carlsbad. Moderate strength rip currents will
accompany the surf. Abnormally high tides are also expected this
weekend, each evening, peaking around 7 feet with each high tide,
with minor overflows possible. A beach hazards statement has been
issued.

&&

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

&&

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

PZ...NONE.

&&

$$

PUBLIC...MM
AVIATION/MARINE/BEACHES...Brotherton



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