632
FXUS66 KSGX 170358 AAB
AFDSGX

Area Forecast Discussion...UPDATED
National Weather Service San Diego CA
858 PM PDT Thu May 16 2024

.SYNOPSIS...
A persistent marine layer will continue into next week with night
and morning low clouds expected each day, and limited clearing at
the coast. Steady high temperatures are expected through the
weekend, with cooling for early next week. Slight warming next
Tuesday and Wednesday will be followed by further cooling late
next week.

&&

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

Evening Update...
After another nice day for the mountains and deserts, some
partial clearing was also seen for some areas in the Inland Empire
and western San Diego County. Temperatures eclipsed the century
mark in the lower deserts with Thermal in the Coachella Valley hitting
100 degrees late this afternoon. Clouds will continue to fill
back into all areas west of the mountains through the early
morning hours on Friday. The deep marine layer will contribute to
another round of drizzle in spots by Friday morning. A troughing
pattern will continue for much of the next week with areas of
gloom west of the mountains and slightly below average
temperatures for mountains and deserts. Take a look below for
further details.

Previous Forecast Discussion (135 PM Thursday)...

Southern California will remain in a fairly stagnant pattern over
the next several days as an upper-level low sits to our west and
multiple lows move through the Pacific Northwest. Persistent "May
Gray" will continue across the coast and valleys each night and
morning with limited clearing expected at the beaches. Patchy
drizzle will be possible at times west of the mountains in the
early morning hours. Minimal changes in high temperatures are
expected through Sunday; highs will top out 2-5 degrees below
normal across the coast, valleys and mountains, and up to 5
degrees above average in the deserts.

The low to our southwest will become an open wave and absorb into
the mean flow, likely passing over the region Monday. This will
lead to an uptick in gusty winds over the mountains and deserts,
and lead to slight cooling-region wide. Monday will likely be the
coolest day of the week, with highs topping out 3-7 degrees below
normal at the coast and in the deserts, and 5-10 degrees below
normal in the valleys and mountains. Slight warming is expected
for Tuesday and Wednesday. Another deep trough moves down the West
Coast by the middle of next week, continuing onshore flow and a
deep marine layer over Southern California.

&&

.AVIATION...
170310Z...Coast/Valleys...BKN-OVC015-025 with tops to 4000 feet
spreading inland tonight, reaching the coastal slopes after 12Z.
Higher terrain will be obscured, with VIS 1-3SM where clouds and
terrain intersect. Expect inland clearing 15Z-18Z and partial
clearing at the coast after 18Z.

Mountains/Deserts...Mostly clear with unrestricted VIS through
Friday morning. West winds gusting 30-40 kt through mountain passes
into adjacent deserts tonight.

&&

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

&&

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


&&

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

&&

$$

UPDATE/PUBLIC...APR/EA
AVIATION/MARINE...PG