.T WSLAXAFDSGX 2404200338/


FXUS66 KSGX 201037
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
335 AM PDT Sat Apr 20 2024

.SYNOPSIS... 
Warming this weekend with less night and morning marine layer clouds 
as a ridge of high pressure moves over the area. A low pressure 
trough deepening down the coast will come ashore next week, bringing 
gradual cooling and stronger onshore winds. There is a slight chance 
of showers in the latter half of the week when the trough progresses 
inland. 

&&

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

Marine layer clouds that cover the Inland Empire and all of Orange 
and San Diego Counties this morning will retreat back to the coast 
through midday, but skies may not fully clear at the beaches. Weak 
high pressure building over the Southwest this weekend will squash 
the marine layer a few hundred feet, and the night and morning 
clouds will not extend as far inland tonight and Sunday night. 

The ridge will bring warming this weekend, the exception near the 
coast where highs will be in the 60s both days. A few miles inland 
from the coast the highs will be in the 60s and low 70s. Farther 
inland it will be much warmer with highs near 80 in the Inland 
Empire, the 60s and 70s in the mountains, and the mid to upper 90s 
in the lower deserts. Sunday will be the warmest day with highs from 
85-90 in the Inland Empire and the high deserts, near 100 in the 
lower deserts, but cooler 60s to mid 70s in the coastal zones.  

The ridge drifts east Monday and Tuesday and an eastern Pacific 
trough deepening down the West Coast will bring increasing onshore 
flow, a deeper marine layer, cooler weather and gusty onshore winds 
Wednesday and Thursday. This trough will bring a chance for light 
rain or drizzle west of the mountains in the steadily deepening 
marine layer ahead of the trough, and a chance for post frontal 
showers Friday and Saturday as the cold core low tracks across 
Southern California. Highs both days will be 5-10 degrees below 
average Friday and Saturday with coastal and valley highs in the 
60s, mountain highs in the 40s and 50s, high desert highs in the 60s 
and low desert highs near 80. 

&&

.AVIATION...
201030Z...Coast/Valleys...BKN/OVC low clouds will prevail early this 
morning in most locations with bases 1700-2500 ft MSL and tops to 
2800 ft MSL and local VIS 3-5 miles in the valleys. Areas of higher 
terrain will be obscured through 16Z. Most areas will clear 15Z-18Z. 
Stratus will develop again near the coast 01Z-05Z Sun, spreading up 
to 25 miles inland by 09Z Sun, with somewhat lower bases 1200-1600 
ft MSL and areas of VIS 1-5 miles in the valleys. Clearing will be 
slower Sun morning.

Mountains/Deserts...Mostly clear skies with unrestricted VIS will 
prevail through Sun morning.

&&

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

&&

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

PZ...None.

&&

$$

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



.END