979
FXUS66 KSGX 311640
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
940 AM PDT Fri May 31 2024

.SYNOPSIS...
A weak trough over the Southwest and a Catalina Eddy over the
coastal waters will keep a deep marine layer in place through early
next week. High temperatures will be a few degrees below average
west of the mountains, and a few degrees above average in the
mountains and deserts. High pressure building over the West next
week will bring warmer days Wednesday and Thursday.

&&

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

The 12Z NKX sounding showed the marine layer depth at 2500 feet this
morning, deep enough for low clouds to spread into the valleys near
Ramona, Temecula and San Bernardino. Clouds will slowly burn back to
the coast this afternoon.

This low cloud pattern will repeat Saturday, Sunday and Monday as a
weak trough over the West and a Catalina Eddy over the coastal
waters combine forces to the keep a deep marine layer in place.
There may be patchy morning drizzle each day, the most widespread on
Monday morning when the marine layer will the deepest.

Sunday and Monday will be the coolest days as that will be when the
trough axis passes, the Catalina Eddy will be strongest and the
marine layer will be the deepest. Highs will be in the mid to upper
60s near the coast, the 70s and low 80s in the valleys, the 70s in
the mountains, near 90 in the high deserts and from 100-105 in the
lower deserts.

The trough will also produce gusty west winds each afternoon and
evening in the mountains and deserts this weekend.

On Tuesday the trough moves east, replaced by weak ridging and
warmer days Wednesday and Thursday when highs will be in the upper
60s and low 70s near the coast, the 80s in the valleys, near 90 in
the eastern sections of the Inland Empire, the 80s in the mountains,
from 95-100 in the high deserts and from 105-110 in the lower
deserts.

&&

.AVIATION...
311630Z...Coast/Valleys...Low clouds with bases 1000-1500 feet MSL
with tops to 2600 feet will clear the valleys through 18Z and
coastal areas 18Z-21Z with areas of lingering BKN low clouds within
3 miles of the coast through this afternoon. Local vis 2-4 miles
will continue in the valleys through 18Z. Low clouds will spread
inland again, to 20 miles inland 01Z-06Z Sat and through most of the
valleys by 12Z Sat. Bases will be 1000-1500 ft MSL with tops to 2500
feet, and higher terrain will be obscured. Areas of vis 2-4 miles
with local vis below 1 mile will occur 06Z-17Z Sat. Low clouds will
clear slowly in the valleys Sat morning, mostly 16Z-19Z with only
partial clearing at the coast Sat.

Mountains/Deserts...Clear skies with unrestricted VIS will continue
through Sat morning.

&&

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

&&

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

&&

$$

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