Weather Service Report

FXUS66 KSGX 260928

Area Forecast Discussion
National Weather Service San Diego CA
228 AM PDT Wed Oct 26 2016

Fair and warmer weather is expected through today and Thursday
with patchy night and morning coastal clouds. A low pressure
system will bring cooler weather, with showers Thursday night
through Friday. Generally fair on Saturday before another low
pressure system brings a slight chance of showers on Sunday. 
Fair but cool weather will continue Monday and Tuesday. 



Mostly clear skies so far this morning and it looks to stay that
way today. Coastal low clouds will be few and far between this
morning and again Thursday morning. High pressure aloft will
continue to build through Thursday morning and Thursday should be
our warmest day in the coming week with highs a couple degrees
above average. High clouds will gradually increase and thicken
ahead of a low pressure system due Thursday night and Friday. This
will come in the form of a shortwave moving through California
rotating around a large long wave trough over the eastern Pacific.
The shortwave draws in quite a bit of moisture and promises to
soak Northern and Central California. But Southern California
remains on the southern fringes of the swath of moisture, so
expected rainfall amounts drop off sharply from LA to San Diego.
Something on the order of a half inch in southwest San Bernardino
county foothills, but locally higher. Orange County around a
quarter to a third inch. Probably only a few hundredths in San
Diego. Brisk winds are expected Friday mainly in mountain ridge
tops and adjacent desert slopes. Gusts could exceed 40 mph in
those spots. The system exits quickly for a fair but partly
cloudy Saturday, because some moisture hangs around. Another
trough moves through California Sunday and takes advantage of that
residual moisture. It doesn't look like much of a rain maker, but
will probably wring out a few showers mainly mountains westward.
Monday looks fair and cool before the next shortwave, this one
weaker, arrives Tuesday. It doesn't look like a rain maker at all.
Cool weather is a pretty good bet heading into November, although
there are some hints at a high pressure ridge to warm things up
later next week.


260900Z...Away from the coast, conditions will remain primarily P6SM
and SKC this morning, though a few patches of surface fog cannot be
ruled out for the valleys through about 15Z this morning. Near the
coast, patchy low stratus with SCT to BKN decks possible through 14Z
this morning, with bases of 1,200-1,800 ft MSL and tops near 1,800-
2,200 ft MSL. Visual obstructions of 1 sm or less are possible were
low clouds approach the higher coastal terrain. Low clouds will
dissipate by 18Z this morning, leaving FEW-SCT cirrus AOA 20,000 ft
MSL and light winds for this afternoon. Patchy low stratus with SCT
to BKN decks possible again tonight through early Thursday morning,
with bases of 1,000-1,500 ft MSL and tops near 1,800 ft MSL. 


No hazardous weather conditions are expected through this evening.
Patchy fog will be possible tonight into Thursday morning, and
visibilities may briefly fall to 1 nm or less. The next storm system
will arrive Thursday evening and continue into Friday, with periods
of rain showers and thunderstorms. Winds and combined seas should
remain below 20 kts and 5 ft respectively. Another chance of rain is
slated for Saturday night into Sunday.


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






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Western Regional Climate Center,