175
FXUS66 KSGX 122032
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
132 PM PDT Wed Jun 12 2024

.SYNOPSIS...
Marine layer night and morning low clouds and fog will persist
along the coast, into the valleys at times, each day into next
week. Tomorrow is expected to be a few degrees cooler than today
for most locations. Another bout of warming is expected for Friday
and Saturday, most noticeable in the lower deserts. Seasonal to
slightly below average temperatures will return Sunday through the
middle of next week. Periods of gusty southwest to west winds are
expected in the mountains and deserts each afternoon and evening
into next week. Gusty westerly winds combined with dry and hot
conditions in the deserts and desert mountain slopes will create
elevated fire weather conditions through the weekend.


&&

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

Visible satellite at 1 PM this afternoon showed a few patches of low
clouds lingering along portions of the northern San Diego and
southern Orange County coast. Low clouds are expected to fill inland
overnight again tonight, reaching into portions of the valleys, with
periods of patchy drizzle. A similar clearing pattern is expected
tomorrow, with low clouds clearing inland but locally lingering at
beaches in the afternoon.

A weak low pressure system will move inland through southern
California late Thursday. As a result, a few degrees of cooling are
expected for most areas Thursday. The cooling trend will be brief as
a weak high pressure system sets up over southeastern California,
southern Nevada, and western Arizona Friday and Saturday. For
Friday, highs will be a degree or two warmer for the coast and 2-6
degrees warmer for the valleys, mountains, and deserts. Warming will
continue into Saturday, which will be the peak of this brief warming
trend. Highs are expected to be 3-7 degrees above average for the
coast and western valleys and 6-12 degrees above average for
portions of the eastern valleys, mountains, and deserts. Moderate to
locally major heat risk is expected in the low deserts, with ares of
moderate heat risk in the Inland Empire, mountains, and High Desert.
During this time its recommended that folks stay hydrated and limit
outdoor physical activities between 10am and 5pm.

A low pressure system moves inland through the western states Sunday
into the middle of next week, bringing seasonal to slightly below
average temperatures to the area. Cooling conditions are expected
for most areas Sunday and Monday, with a few degrees of warming
expected by Tuesday. The increase in onshore flow with the passing
trough will also allow for the marine layer to deepen again with low
clouds reaching into the valleys.

&&

.AVIATION...
122020Z...Coast/Valleys...Low clouds based 900-1100 ft MSL with tops
to 2000 ft MSL coastal waters and locally onshore.

After 13/0300 UTC this afternoon low clouds based 900-1100 ft MSL
spreading inland mainly near KCRQ first, reaching KONT around 12Z
but unlikely to reach KSBD. Areas of VIS 2-4SM in fog where clouds
and terrain intersection. Confidence in BKN conditions returning to
KSAN around 12/0500Z this evening is moderate.

Mountains/Deserts...SKC with unrestricted VIS.

&&

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

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Excessive Heat Watch from Friday morning through Saturday
     evening for Coachella Valley-San Diego County Deserts-San
     Gorgonio Pass Near Banning.

PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE...Small