004 
FXUS66 KSGX 151207
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
507 AM PDT Tue Mar 15 2022

.SYNOPSIS...
Through Friday, the lower level flow will alternated between weak
onshore and weak offshore, cooler with the onshore with more night
and morning coastal low clouds and fog, and warmer with the weak
offshore with fewer coastal low clouds. For the weekend, a
stronger trough of low pressure will move inland through 
southern California spreading cooling inland. There will also be
stronger and gusty southwest to west winds for the mountains and 
deserts and a slight chance for light precipitation.

&&

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

Through Friday, the lower level flow will fluctuate between weakly
onshore and weakly offshore as a series of weak low pressure and
weak high pressure systems move inland across the area in
progressive westerly flow. A weak trough of low pressure will move
inland through California late today and tonight and again late
Thursday with high pressure aloft on Wednesday night and around
Friday. The periods of onshore flow will spread cooling inland
into the coast and valleys with warming in between with weak
offshore and high pressure aloft.

For early this morning, there is a weak coastal eddy with 
satellite imagery showing stratus spread northward along the coast
of Baja and southern California as far north as southern Los 
Angeles County. In San Diego County, the low clouds and fog have 
been as far inland as the mesas, but the eastern edge has migrated
back toward the coast. Higher resolution models continue to move 
the eastern edge slowly westward early this morning. There is 
also a more extensive area of low clouds spreading southward just 
beyond the offshore islands. For tonight into Wednesday morning 
with stronger onshore flow and a weak coastal eddy, coastal low 
clouds and fog should be more extensive and spread inland into the
western San Diego County valleys and northward across much of the
Orange County coastal plain.

A stronger trough of low pressure will move inland through
southern California over the weekend. There remain timing and
amplitude differences among the global ensemble systems with this
low pressure system. It will spread cooling inland for Saturday 
and Sunday and bring a period of stronger and gusty southwest to 
west winds in the mountains and deserts. There is a also chance of
mostly light precipitation with the most likely time for any
precipitation Saturday night into Sunday morning, but with 
precipitation possible as early as Saturday or as late as Sunday 
night. 

&&

.AVIATION... 
150930Z....Areas of low clouds along the coast will be based at 400-
700 feet MSL with vis 2-5SM through 15Z. Otherwise, mostly clear 
skies will prevail today, but with increasing high clouds after 23Z. 
  
&&

.MARINE...
Northwest winds with gusts over 20 knots are expected Wednesday, 
Thursday evening and late Saturday in the outer waters. These winds 
along with choppy sea conditions could be hazardous for small craft 
during these periods. Otherwise, no hazardous marine conditions are 
expected through Saturday. 

&&

.BEACHES...
Elevated surf and strong rip currents will occur tonight through 
Thursday when some sets up to 6 feet are possible.

&&

.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
AVIATION/MARINE/BEACHES...MM