Area Forecast Discussion
Issued by NWS San Diego, CA

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FXUS66 KSGX 161036

Area Forecast Discussion
National Weather Service San Diego CA
235 AM PST Sun Dec 16 2018

High pressure aloft will continue fair, dry and mild weather today.
Monday will be cooler with more clouds. There is a small chance of
light showers along and west of the mountains Monday night as a
trough passes to the northeast. A strong ridge will build in behind
the trough with fair and much warmer weather Wednesday through
Friday. High surf will pound the beaches Monday and Tuesday.



Skies were mostly clear again overnight across SoCal. Weak offshore
gradients prevailed again and wind reports were mostly light. At 2
AM PST...Stronger winds of 15 to 20 MPH were mainly from the NE
and along the coastal foothills.

Brace yourself for another stellar December day across SoCal with
above average temps and plenty of sun. Monday will be cooler with
more high clouds as a trough over the EastPac approaches the Coast.
It will bring rain to northern/central CA, but it will be weakening
rapidly as it moves inland. We continue with a very small chance for
a few light showers along and west of the mts, mainly Mon evening
and overnight. Otherwise continued dry, but with better onshore
flow, higher humidity, and more marine clouds into Tue morning.

Mon/Tue will be the coolest days of the week. A strong ridge is
developing and will drift over SoCal midweek. This will result in
weak/moderate Santa Ana conditions with gusty offshore flow along
the coastal foothills at times, and temps well above normal. Cooling
will begin on Friday as the ridge deflates and moves east. By next
weekend the models show a benign pattern along the West Coast with
dry NW flow aloft with a few embedded weak troughs. Temps will
likely remain above average.


160920Z...Patches of low clouds with bases around 1000 ft MSL
currently over the coastal waters could reach coastal TAF sites
between 11Z and 16Z, however confidence is low that there will be
cig and/or VIS impacts at TAF sites. Elsewhere, clear skies and
unrestricted vis through today.


A large WNW swell Monday and Tuesday will generate combined seas of
10-13 feet in the outer coastal waters. Swell and seas will lower


A High Surf Advisory is in effect from Monday morning through
Tuesday evening. A west northwest swell of 10-13 ft in the outer
waters with a period of 18-20 sec from 290 degrees will impact the
area Monday and Tuesday. Surf of 6-11 feet is likely with sets to 13
ft possible, highest south of Del Mar. Strong rip currents and
dangerous swimming conditions at all beaches. Swell and surf will
gradually lower on Wednesday, though another large swell could
again bring elevated surf around Friday.


Skywarn activation will not be needed this weekend.


CA...High Surf Advisory from 8 AM Monday to 10 PM PST Tuesday for
     Orange County Coastal Areas-San Diego County Coastal Areas.



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