Area Forecast Discussion
Issued by NWS San Diego, CA
FXUS66 KSGX 091023
Area Forecast Discussion
National Weather Service San Diego CA
223 AM PST Fri Dec 9 2016
Fair and seasonal weather is forecast today with variable high
clouds. Onshore flow will increase this weekend rebuilding the
marine layer. Low clouds will increase in the coastal basin leading
to a chance of light showers Saturday night and Sunday. Fair and
seasonal weather will follow Monday through at least Wednesday. A
storm system could bring rain Thursday or Friday.
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
Our tranquil morning today features scattered high clouds and
isolated coastal low clouds. We expect another fair day but with
more high clouds. The low clouds will increase this evening and
mostly fill the coastal basin tonight. Onshore flow will increase
this weekend and continue to deepen the marine layer. A band of
moisture that`s been giving rain to Northern California will
gradually drop south into Southern California. This band will
combine with the existing marine layer to produce some showers
along and west of the mountains Saturday night and Sunday morning.
Winds in parts of the mountains and deserts will increase at the
same time and become rather brisk Saturday and Saturday night with
some gusts reaching 40 mph. Rainfall amounts will mostly be
less than a tenth inch. A couple spots will get more and some
spots will get nothing. The rain chances go away Sunday afternoon
and dry air moves into the region. Not much high pressure or warm
air follows Monday and Tuesday, but more sunshine will bring
slightly warmer weather through Wednesday. The Euro and GFS
models are in decent agreement for an upcoming storm, but a little
out of phase on the timing. They show a swath of moisture west of
California getting picked up by a shortwave trough and driving
through Southern California. Either Thursday or early Friday as
it looks right now. It looks pretty wet and average windy for a
winter storm, but will move through fairly quickly. Following the
storm northerly flow coming straight south out of the Yukon will
make things pretty chilly around here and all of the western U.S.
if the models have the right idea.
0910000Z...Coast/Valleys...Patchy low clouds this morning through
16Z with bases of 1000-1500 ft MSL and tops near 2000 ft MSL.
Visibility restrictions of 2-4 SM will occur over the coastal mesas
and portions of the Inland Empire where low clouds near terrain.
Predominantly BKN AOA 10000 ft MSL will prevail through 21Z this
afternoon. BKN-OVC low clouds with bases of 1500-2500 ft MSL should
develop quickly after 21Z this afternoon, building inland over the
valleys through 03z Saturday. Winds will remain light over the
region through Saturday.
Mountains/Deserts....Light winds, unrestricted visibility and high
clouds AOA 10000 ft MSL will prevail through Saturday morning. Gusty
westerly sfc winds developing Saturday afternoon with gusts 35 to 45
knots at times.
No hazardous marine weather is expected through Tuesday.
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.