Area Forecast Discussion
Issued by NWS San Diego, CA
FXUS66 KSGX 281023
AREA FORECAST DISCUSSION
National Weather Service San Diego CA
323 AM PDT SAT MAY 28 2016
A weak low pressure system moving inland through Southern
California will bring a slight chance of showers to the mountains
this afternoon and a slight thunderstorms to the mountains and
upper deserts for Sunday afternoon. Slightly below seasonal
high temperatures will continue for inland areas this weekend with
the marine layer and weak onshore flow bringing areas of night and
morning low clouds and patchy fog to coastal and valley areas.
For Monday through Thursday...high pressure aloft over California
will strengthen bringing inland warming and a gradually shallower
marine layer. High pressure may begin to weaken toward the end of
next week with slow inland cooling for next weekend.
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
A weak low pressure system will move inland through Southern
California this weekend...then move into Arizona and weaken
Monday as high pressure aloft strengthens over California through
Thursday. Toward the end of next week...high pressure may begin to
slowly weaken and move inland with more model spread in the
details beyond Thursday.
As the trough of low pressure moves inland this weekend...there
remains a slight chance of showers near the mountains this
afternoon...and a slight chance of thunderstorms Sunday
afternoon...mainly for the mountains and upper deserts. The
marine layer will remain near 3000 to 3500 feet deep for this
weekend with night and morning low clouds and patchy fog extending
into the far inland valleys. Some patchy late night and early
morning drizzle may continue...mainly for coastal and western
valley areas. High temperatures near the coast will remain near
average with inland high temperatures slightly below average.
For Monday through Thursday...inland high temperatures will warm
as high pressure aloft strengthens with the marine layer becoming
gradually shallower. For next weekend...high pressure may begin
to weaken with slow inland cooling and slow deepening of the
280930Z...Coast/Valleys...BKN/OVC stratus with bases 1300-2000 ft
MSL and tops 3000 ft will continue across the coastal and western
valley areas through late morning. Stratus should partially clear to
the coast by early afternoon. Valleys should clear 15-17z and
coastal areas should scatter out 18-21z. Patchy drizzle also likely
through about 16z this morning. Visibility restrictions as low as 1
sm possible in valleys, including vcnty KRNM, KRAL, KRIV, KCNO, and
KF70. Renewed coastal stratus this evening aft 03z building inland
overnight. Bases tonight will likely be a little bit higher, likely
1800-2500 ft msl.
Mountains/Deserts...Mostly clear skies will prevail through midday.
For this afternoon, SCT-BKN086-100 with isolated shra will occur
over the mountains, diminishing by 02Z Sunday. Unrestricted vis will
prevail through Saturday, except under brief showers.
230 am...No hazardous marine conditions are expected through
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.