Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 181019
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
319 AM PDT Fri Aug 18 2017

.SYNOPSIS...
High temperatures for the next week will be near to slightly below
average with today and Saturday the warmest days. The marine layer
and weak onshore flow will continue areas of night and morning
coastal low clouds and patchy fog extending into the western
valleys. A weak low pressure system off the Southern California
coast may draw a small amount of mid level moisture into Southern
California at times into Tuesday...mostly across the San
Bernardino County mountain areas into the adjacent upper deserts.
Some mid level clouds are possibly...especially near the mountains
in the afternoons...but chances for any precipitation are small.

&&

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

A weak upper level low pressure system will remain just off the
Southern California coast into Tuesday. This system will move
inland around Wednesday or Thursday of next week with weak upper
troughing in some form remaining near the West Coast into next
weekend.

High temperature will remain near to slightly below average with
today and Saturday the warmest days. Areas of night and morning
coastal low clouds and patchy fog will extend into the western
valleys.

That weak upper level low pressure system off the Southern
California coast may draw some mid level moisture into portions of
Southern California at times into Tuesday...mostly from the east-
west mountain ranges into adjacent portions of the upper deserts.
This could bring some mid level clouds at times...and some
afternoon clouds near the mountains...but chances for any
precipitation are small.

&&

.AVIATION...
180900Z...Coast/Valleys...Low clouds with bases near 1500 ft msl
will continue to build within 25 miles of the coast through 14Z.
Ceilings are likely at KSAN, KCRQ and KSNA, but are not anticipated
at KONT during this period. Visibility restrictions of 3 SM or less
will occur near higher coastal terrain. Look for the low clouds to
clear to the coast between 15Z and 17Z, with patchy low clouds
lingering over the coastal waters there after through 03Z Saturday.
Light westerly sea breezes are expected between 17Z Friday and 03Z
Saturday. Low clouds with bases near 1500 ft msl will slowly return
to areas within 25 miles of the coast after 03Z Saturday.

Mountains/Deserts...Clear skies, unrestricted visibility and light
winds will continue through Saturday morning.

&&

.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 the weekend. This swell will increase surf, with sets to 5
ft possible north of Carlsbad. Moderate strength rip currents will
accompany the surf.

&&

.SKYWARN...
Skywarn activation will not be needed today.

&&

.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/BEACHES...BA



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