802
FXUS66 KSGX 091041
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
340 AM PDT Sun Jun 9 2024

.SYNOPSIS...
High pressure building over Arizona and the eastern California
deserts will bring warmer days to the valleys, mountains and
deserts Monday through Wednesday. Coastal temperatures will
remain relatively unchanged due to the persistent marine layer.

&&

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

The marine layer this morning was 2800 feet deep in San Diego
County and 3400 feet deep in San Bernardino County, deep enough to
fill the Cajon Pass with clouds and fog. Drizzle was reported at
several stations in northwestern San Diego County including
Fallbrook, Vista, Carlsbad, Cardiff, Encinitas and Del Mar, all of
which recorded 0.01" of precipitation through 3 AM. The drizzle will
end later this morning with slow clearing from the valleys back to
the coast this afternoon. As we have seen the past few days, the
clouds will likely persist at the coast all day, and any late day
clearing will be brief.

Beach highs will be in the 60s.
Orange County and San Diego Valley highs will be from 70-75.
Inland Empire highs will be from 75 to 83.
Mountain highs will be in the 70s.
High Desert highs will be near 90.
Low Desert highs will be from 100-105.

From Monday through Wednesday a ridge building over Arizona will
exert enough influence over southeastern California to bring warmer
days to the mountains, deserts, and even some inland valleys. In
contrast, the coastal areas will see little change in the weather as
a 500 mb closed low stalls off the coast of northern Baja, keeping a
shallow marine layer in place and coastal highs in the 60s to low
70s.

On Thursday and Friday the cutoff is ejected eastward across
SoCal by a shortwave trough over the eastern Pacific. This wave
will bring a few degrees of cooling Thursday and Friday.

&&

.AVIATION...
090915Z...Coast/Valleys...Widespread OVC clouds with bases 1000-1800
ft MSL will prevail with tops to 3000 ft MSL and higher terrain
obscured. Local VIS below the clouds of 3-5 miles will occur in
BR/DZ. Most valleys will clear 15Z-18Z with partial clearing in
coastal areas 18Z-21Z. Some locations within 3-5 miles of the coast
will have BKN clouds through this afternoon. Low clouds will spread
inland again tonight with similar or slightly higher cloud bases and
will again reach most valleys by 09Z Mon.

Mountains/Deserts...FEW-SCT250 and unrestricted VIS through Mon
morning. Areas of W-NW winds with gusts 25-35 kt will occur again
22Z Sun-08Z Mon from the mountain crests east through the desert
slopes and into the adjacent deserts.

&&

.MARINE...
No hazardous marine conditions are expected through Thursday.

&&

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

&&

$$

PUBLIC...Moede
AVIATION/MARINE...Maxwell