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000 
FXUS66 KSGX 280415
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
915 PM PDT Sun May 27 2018

.SYNOPSIS...
The warming trend that began today will continue for the next two
days, with Tuesday being the warmest day. The second half of the
work-week will be a little cooler again before temperatures turn
upward next weekend. Along the coast, night and morning low 
clouds will continue, with various degrees of clearing each 
afternoon. The mountains and deserts will see ample sunshine.
 
&&

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

The closed low remains over the Central Rockies this evening and 
a shortwave rotating around the low triggered some showers earlier
over the northern Mojave Desert. The cells weakened quickly as 
they moved to the southeast and failed to reach the southern parts
of San Bernardino County.

Following the sunny afternoon, low clouds have already begun to
encroach on the beaches of southern San Diego County and will
likely spread several miles inland overnight in spite of the
marine layer being shallower than in recent days.

The closed low will move farther to the northeast for Memorial 
Day and a weak, transient ridge begins to build over the region.
This will help push afternoon high temperatures back to near 
seasonal averages. Morning low clouds near the coast should 
transition to sunny skies by the afternoon.

The weather will remain close to seasonal through this week. The weak
high pressure ridge will continue the warming trend through 
Tuesday, before a trough of low pressure sends temperatures back 
to sub-average readings by Thursday. Night and morning low clouds
will continue along the coast and over the valleys, with variable
clearing times each day.

Temperatures could increase again for next weekend as the low
pressure trough moves to the east and weak high pressure builds in
from the southwest.

&&

.AVIATION... 
280415Z..Coast/Valleys...Areas of stratus will gradually spread into 
the valleys tonight, reaching 30-40 miles inland by 10Z Mon. Bases 
will be lower than previous nights, 1300-1700 ft MSL with tops to 
2200 ft MSL, with higher terrain obscured. Local vis below 3 miles 
will occur in the valleys 08Z-16Z Mon. Most valleys will clear 15Z-
17Z Mon, and the coast will mostly clear by 19Z Mon. Stratus will 
develop again Monday evening.

Mountains/Deserts...Mostly clear skies with unrestricted vis will 
continue through Monday evening. Local wind gusts 25-35 kt from the 
west will occur through passes and on desert mountain slopes this 
evening and again late Mon afternoon/evening.

&&

.MARINE...
No hazardous marine weather is expected through Friday.

&&

.SKYWARN... 
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.

&&

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