FXUS66 KSGX 231551 AAB
Area Forecast Discussion
National Weather Service San Diego CA
850 AM PDT Fri Mar 23 2018
Added aviation and marine discussion
Just sent a quick update to add fog this morning to the valleys
and San Diego coast. No other changes attm.
Light showers will end by late morning. Additional light
precipitation is possible Saturday evening through Sunday morning.
Otherwise cool through the weekend. Gradual warming and drying
next week as a ridge of high pressure moves over and offshore flow
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
Scattered light showers continue to move west over Southern
California this evening as the upper level trough pushes inland.
As has been the theme with this system, most of the rain has been
over San Bernardino and Orange Counties, with lighter and more
isolated showers further south. Expect showers to end by late
morning, followed by cool and dry weather for the remainder of the
Weak troughing remains over the region through Monday for
continued cool weather with periods of gusty onshore winds in the
mountains and deserts. A weak wave moving through late Saturday
and Sunday may bring a brief period of drizzle or light showers
over and west of the mountains. Any accumulation will be limited
to a few hundredths. The snow level will gradually drop from
around 5500-6000 ft Saturday evening to 4500-5000 ft Sunday
morning, but snowfall amounts will generally be less than an inch.
As the trough digs further southeast on Tuesday, north-northeast
flow aloft and strengthening offshore pressure gradients will
create gusty north-northeast winds, mainly for the the San
Bernardino Mountains, portions of the Inland Empire, and the Santa
Ana Mountains portions of Orange County. Weaker offshore flow will
follow for Wednesday and Thursday as both upper level support and
pressure gradients weaken. An upper level ridge will slowly move
over So Cal through this period as well. This combination will
lead to gradual warming and drying, especially for the coastal and
valley. High temperatures will be several degrees above normal by
231545Z...BKN010-020 with scattered -SHRA through 18Z in the coastal
and valley airports with areas vis 2-5 miles. Mountains obscured in
clouds and fog. After 18Z...partial clearing with skies becoming SCT-
BKN020-030 through 23Z. Tonight...low clouds reforming after 05Z
with ceilings BKN-OVC010-015 through 17Z Saturday.
Deserts: Mostly clear today and tonight. Gusty northwest winds 15-25
kt from 00-06Z at KPSP and KTRM.
Northwest winds will increase late tonight with gusts to 25 to 30 kt
Saturday through Sunday night. A short-period swell combined with
the strong winds will make boating conditions hazardous for the
weekend. Winds and seas will diminish Monday.
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.
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