Crestline, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

461
FXUS66 KSGX 131538
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
838 AM PDT Tue May 13 2025

.SYNOPSIS...
Cool conditions today along with periods of gusty winds, strongest
over the mountains and deserts, and isolated light rain showers/
drizzle along and west of the mountains. Warmer and dry
conditions will return for Wednesday. High temperatures will
remain below average for the rest of the week. Over the weekend,
additional cooling with an uptick in winds expected. Night and
morning low clouds are expected each day.

&&

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

A trough of low pressure currently over the Great Basin this morning
will continue to dig south as it moves east today. The main impact
from this low so far for Southern California has been areas of gusty
winds in the mountains and deserts, and some light rain/drizzle
along and west of the mountains this morning. As of 8 AM peak wind
gusts today have been in the 45 to 55 mph range with a few gusts
closer to 60 to 65 mph in wind prone locations. Any precipitation
this morning has been light with accumulations under a tenth of an
inch for the coast and valleys and up to 0.15 inches on the coastal
mountain slopes. High resolution model guidance is indicating that
any additional shower activity after this morning will be limited
to the mountains. Guidance has indicated that winds peaked
overnight, with another weaker uptick in winds tonight. Winds will
diminish in to Wednesday morning.

The main trough axis will be to our east by Wednesday but the region
will maintain an overall troughing pattern with a ridge of high
pressure building over the Eastern Pacific. The overall troughing
pattern will keep high temperatures just below the seasonal normal
through Friday and maintain at least night and morning low cloud
coverage. The consistent onshore pressure gradient will maintain
elevated afternoon sea breezes on the desert mountain slopes and
deserts.

For the weekend, there is better agreement that troughing
will continue to prevail over the Western United States. There does
remain some disagreement on the position of the trough, which will
have impacts on our temperature, wind, cloud, and precipitation
forecast. For Sunday there is more agreement in a deeper trough, but
there is uncertainty in how far west or east the trough will be
which will have larger impacts on if any precipitation will be
associated with this system. Regardless of the depth of the trough,
increased winds and cloud coverage this weekend are likely. By
Monday, there is good ensemble agreement that the trough will be
off to our east with upper level ridging beginning to inch closer
to the West Coast. By Tuesday, the majority of ensemble clusters
show ridging over the West Coast.

&&

.AVIATION...
121530Z...Coast/Valleys...BKN low clouds based near 3500 feet MSL
with tops to 5000 feet MSL will continue. Higher terrain 3500-5000
feet MSL obscured. Some scatter out after 18-20Z expected VCNTY
 KSNA and KONT, but more likely to remain BKN in San Diego County
through the day and evening. Low clouds replenishing the coastal
basin again after 04-06Z in northern areas.

.Mountains/Deserts...mostly clear today and tonight. Westerly winds
with gusts 25-40 kts, locally near 50 kts on desert slopes and
through mountain passes. STG UDDFS occurring in lee of mountains.
Areas of BLDU in the deserts. Winds diminish after 04Z.

&&

.MARINE...
Stiff west-northwest winds will continue through this evening in the
outer waters. Gusts to 25 kt will lead to hazardous conditions for
small craft, strongest winds near San Clemente Island. A Small Craft
Advisory remains in effect through late tonight. No additional
hazardous marine conditions are expected Wednesday through Saturday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory until 5 AM PDT Wednesday for Apple and Lucerne
     Valleys-Riverside County Mountains-San Bernardino County
     Mountains-San Diego County Deserts-San Diego County
     Mountains-San Gorgonio Pass near Banning.

PZ...Small Craft Advisory until 11 PM PDT this evening for Waters
     from San Mateo Point to the Mexican Border Extending 10 to
     60 nm out including San Clemente Island.


&&

$$

PUBLIC...CO
AVIATION/MARINE...APR