Mesa Grande, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

856
FXUS66 KSGX 171012
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
312 AM PDT Thu Apr 17 2025

.SYNOPSIS...
Cooler, cloudier, and windier conditions expected through Friday.
Occasional light showers will continue into Friday evening with
the relatively greater coverage and amounts along the coastal
slopes of the mountains and for San Diego County from the coast to
the mountains. Dry for the weekend into next week with areas of
night and morning coastal low clouds and fog. Warmer for the
weekend into Monday, then gradually cooler.

&&

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

.SHORT TERM (Today through Saturday)...
A weakening low pressure system from the west and a low pressure
system from the north moving into the Great Basin will maintain
cool, moist, cyclonic flow across the area +through Friday. High
temperatures will remain below average, as much as 12 to 18
degrees below average for the mountains.

Periods of stronger and gusty southwest to west winds will
continue into tonight with the stronger gusts along and below the
east slopes of the mountains to 45 to 55 mph with isolated gusts
to 70 mph in the northern Coachella Valley below the San Gorgonio
Pass.

Occasional showers will continue into Friday evening with general
rainfall and liquid-equivalent above the snow level ranging from
less than one-tenth inch near the coast to one-tenth to one-
quarter inch in the mountains with local amounts to one-half inch
and isolated amounts to three-quarters of an inch. HREF shows the
relatively greater coverage and amounts along the coastal slopes
of the mountains and in San Diego County from the coast to the
mountains.

Then dry and warmer on Saturday with high temperatures as much as
10 to 15 degrees warmer than Friday for the inland valleys onto
the coastal slopes of the mountains. High temperatures on Saturday
will range from the mid 60s near the coast to the 70s for the
Inland Empire with the 80s for the lower deserts.

&&

.LONG TERM (Sunday through Wednesday)...
Warming will continue on Sunday with continued slower warmer for
the deserts into the mountains on Monday with slight cooling on
Monday for the coast and valleys. Slow cooling of
a few degrees per day will then spread inland on Tuesday and
Wednesday. Dry weather will continue with night and morning
coastal low clouds.

&&

.AVIATION...
170930Z....Coasts/Valleys/Foothills...BKN-OVC clouds based near 5000-
6000 feet MSL will continue today, but locally down to 2500-3500
feet MSL in occasional -SHRA through 18Z. Higher terrain mostly
obscured in FG/-SHRA up to 7500 feet MSL today and tonight. Partial
and intermittent scatter out most likely near the coast 18-02Z.
-SHRA increasing again after 02Z, with bases lowering to 2000-3000
feet MSL.

Higher Mountains/Deserts...Mostly clear, except for some clouds
10000-20000 feet MSL after 00Z. Westerly winds will continue strong
today and tonight with gusts 30-40 kts, locally up to 55 kts through
and below passes. Strong up/downdrafts and isolated LLWS in lee of
mountains such as vcnty KPSP.

&&

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

&&

.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...17
AVIATION/MARINE...MM