Thermal, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

562
FXUS66 KSGX 100352
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
852 PM PDT Wed Apr 9 2025

.SYNOPSIS...
Warm weather will continue through Friday as high pressure stays
over the region. This will bring a shallow marine layer with periods
of fog along the immediate coast. A troughing pattern will take hold
into the weekend and much of next week, leading to cooler weather
and low clouds venturing further inland across the western valleys.

&&

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

Satellite imagery at 8:30 PM was showing patches of low clouds along
the immediate coast in San Diego County. In areas of fog, visibility
is 1 mile or less. Low cloud coverage is expected to become more
widespread overnight, but stay within a few miles of the coast.
Patches of fog may continue along the beaches into Thursday
afternoon.

Previous discussion issued at 2 PM April 9, 2025...

High pressure over Baja California will dominate the near-term
forecast period, providing warm weather and mostly sunny conditions.
High temperatures will rise a few degrees each day through Friday as
the area of high pressure strengthens. Chances are high to see
triple digit heat across the lower deserts by Friday with highs near
90 degrees in the high desert and across far inland valleys west of
the mountains.

A dry trough will develop off the coast and near SoCal by the
weekend. This will bring cooling across the region to temperatures
near to slightly above average with a deeper marine layer,
inhibiting any fog development to foothills and higher terrain. A
stronger trough will also pass over the Pacific NW on Saturday,
tightening the pressure gradient. This will lead to elevated winds
across the mountains and deserts with gusts near 30-45 MPH at times.
Models are in fairly good agreement on another low rotating through
the trough into the middle of next week. This will keep the similar
weather pattern through much of next week with night and morning low
clouds at the coast and western valleys along with highs near
normal.

&&

.AVIATION...100300Z...Coast...Patchy fog and low clouds with bases
200-300 feet MSL have developed along parts of the coast and will
continue to fill into the areas within a few miles of the coast. Vis
reductions 0-2 SM in low clouds/fog. 60% chance for cigs at KSAN by
06Z, with lower chances (about 40%) for BKN or more cigs at KCRQ and
KSNA after 08Z and 12Z respectively. Scatter out 15-18Z, but patchy
fog will linger at beaches through the afternoon.

Elsewhere...Mostly clear skies tonight and Thursday.

&&

.MARINE...
Areas of fog with visibility 1 NM or less are possible tonight from
about midnight through 10 AM Thursday. Otherwise, no hazardous
marine conditions are expected through Sunday.

&&

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


&&

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

&&

$$

PUBLIC...CO
AVIATION/MARINE...CSP