Area Forecast Discussion
Issued by NWS San Diego, CA

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FXUS66 KSGX 161636

Area Forecast Discussion
National Weather Service San Diego CA
930 AM PDT Wed Aug 16 2017

An upper-level trough along the West Coast will maintain a deep
marine layer and below average temperatures today. The trough will
weaken Thursday through Saturday and create a shallower marine layer
with highs closer to seasonal normals. Another trough will form off
the Southern California coast early next week for cooler weather and
a deeper marine layer.



Cloud cover this morning was very similar to yesterday morning,
extending deep into the valleys and shrouding the lower slopes of
the SBD mountains and the Cajon Pass. The difference between
yesterday and today is the cloud layer is 1400 feet thick this
morning compared to 2800 feet thick yesterday, so clearing will be
faster today.

The synoptic pattern this week shows the long wave trough filling
and weakening over the Southwestern U.S through Saturday. Instead,
dry southwest flow and below average heights will keep temperatures
at or slightly below average. Early next week the trough deepens off
the Southern California coast which will bring a deeper than normal
marine layer. Areas along the coast may have trouble viewing the
solar eclipse on Monday due to possible marine layer clouds.


161500Z...Coast/Valleys...Widespread low clouds with bases between
2000 and 2500 ft MSL and tops to 3500 ft MSL beginning to clear at
this hour. Expect visibility restrictions of 2SM or less where low
clouds and higher terrain intersect. The low clouds will clear
slowly between 17Z and 20Z, with locally SCT-BKN low clouds
lingering over the beaches and coastal waters between 20Z today and
03Z Thursday. Low clouds with bases near 1800 ft MSL and tops 3000-
3500 ft MSL will return to the coast and western valleys after 03z
Thursday, spreading inland overnight.

Mountains/Deserts...Clear skies and unrestricted visibility through
Thursday morning.


No hazardous marine weather is expected through Sunday.


A building moderate period south swell (2-3 ft at 200 degrees) will
arrive in the coastal waters late Thursday and continue through the
weekend. This swell may bring elevated surf (4-6 ft) and strong rip
currents to the beaches Friday - Sunday. No products are being
issued at this time, however a Beach Hazard Statement may be
necessary later in the week.






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