000
FXUS66 KSGX 211716 AAA
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
915 AM PST Sun Jan 21 2018

.SYNOPSIS...
High pressure will bring dry weather with a 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 mostly 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...

The frost advisory was allowed to expire this morning. We did have 
cold temperatures in the deeper valley areas with a lot of 
temperatures in the upper 20s to lower 30s. Temperatures will 
rebound pretty nicely today as we bring some ridging aloft into the 
region. Today will be the start of a long term warmup through 
Wednesday with temperatures generally rising above normal to up to 
10 degrees above normal by Tuesday and Wednesday. No significant 
changes were made to the forecast this morning and the remainder of 
the previous discussion is shown below.

For late Wednesday night and Thursday... a fast moving low pressure 
system will move inland through California with some continuing 
slight differences in timing among the global models.
This will bring cooling...strong gusty west to northwest winds in
the mountains...deserts...and coastal waters...and small chances 
for light precipitation. This system appears to be a little drier 
than the one that moved through Southern California this past 
Friday and Saturday.

Then 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 weak to 
locally moderate strength gusty northeast winds near the coastal 
foothills and below passes and canyons.

&&

.AVIATION... 
211552Z...P6SM vis through Monday morning. FEW-SCT clouds AOA 20000 
ft msl becoming BKN-SCT 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 this morning 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...17/JMB
AVIATION/MARINE/BEACHES...Harrison

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