Area Forecast Discussion
Issued by NWS San Diego, CA

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502
FXUS66 KSGX 212232
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
232 PM PST Sun Jan 21 2018

.SYNOPSIS...
High pressure will bring dry weather with a significant warming
trend through Wednesday with gusty northeast winds near the
coastal foothills and below passes and canyons at times...and some
passing high clouds at times. A fast moving Pacific low pressure
system will move inland through California on Thursday, bringing
cooling...strong gusty west winds in the mountains and
deserts...and a chance of light precipitation. Dry with a warming
trend for Friday through next weekend as high pressure aloft will
strengthen near the West Coast. Surface high pressure over the
Great Basin will bring periods of gusty northeast winds near the
coastal foothills and below passes and canyons.

&&

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

Another chilly night tonight especially for the inland valleys
which will dip into the lower to middle 30s. Temperatures near
freezing however will not be widespread enough for another frost
advisory event.

Pressure gradients are already near neutral this afternoon. Gusty
offshore winds will develop late tonight and continue through
Monday morning near the coastal mountain slopes and canyons with
gusts around 30 to 35 mph in the most wind favored locations.
Light offshore gradients will continue Monday and become a little
stronger Tuesday and Wednesday with some isolated wind gusts over
50 mph possible in the most wind favored locations. In addition
the combination of high pressure and offshore flow will bring
above normal temperatures Tuesday and Wednesday with many
locations likely to reach around 10 degrees...and in isolated
locations 15 degrees above normal with a few readings around 80
degrees possible in the inland valleys.

A vigorous upper level trough will bring some light precip to the
mountains, coast and valleys on Thursday, along with some strong
and gusty westerly winds which will likely reach advisory level in
wind favored locations.

Strong ridging next weekend with offshore flow developing again
and dry conditions with above normal temperatures likely once
again.

&&

.AVIATION...
212035Z...P6SM vis through Monday morning. SCT clouds AOA 20000 ft
msl becoming BKN after 22/0000 UTC.

&&

.MARINE...
Hazardous marine conditions not expected through Wednesday. Thursday
into early Friday, a Pacific storm-system may bring another round of
strong northwest winds of 25 KTS or more, accompanied by rough,
elevated seas.


&&

.BEACHES...
The west-northwest swell is lowering further this afternoon and will
continue to lower through Monday. Elevated surf of 3-6 feet will
occur today and lower a bit more tomorrow, with a high rip current
risk continuing.

&&

.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...Brotherton
AVIATION/MARINE/BEACHES...Harrison



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