March Air Force Base, California Weather Forecast Discussion

734
FXUS66 KSGX 031600 AAB
AFDSGX
Area Forecast Discussion...UPDATED
National Weather Service San Diego CA
900 AM PDT Fri Oct 3 2025
.SYNOPSIS...
Gusty winds expected over the mountains and deserts, peaking this
afternoon and overnight. Cooler conditions today, with weak offshore
winds and warming west of the mountains Saturday. Another brief cool
down for early next week, with a gradual warming possible into the
middle/end of next week.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
Visible satellite at 9 AM was showing patchy low cloud coverage at
the coast and into the valleys. The strongest winds this morning
have been confined to the San Gorgonio Pass with gusts in the 40 to
50 mph range. Winds are expected to continue to increase over the
mountains and into the deserts through the day, peaking in strength
in the late afternoon and overnight hours. Gusts 35 to 55 mph with
gusts to 65 mph in the northern Coachella Valley below the San
Gorgonio Pass. The marine layer is expected to be a similar depth
tonight. However, the strength of the marine inversion is still
fairly weak and coverage of low clouds over the coast and valleys
will continue to be quite patchy tonight into Saturday morning.
The upper level low that will move through California today will
quickly move into Nevada Saturday. That will bring a brief period of
northerly winds Saturday morning. Those northerly winds will be most
present on the coastal mountain slopes and below the Cajon Pass. The
offshore winds may result in quicker clearing of any clouds that
develop in the valleys and Orange County. Onshore flow will return
by the afternoon. High temperatures will warm a few degrees west of
the mountains tomorrow, with the deserts still a few degrees cooler.
By Sunday, minimal change in temperatures expected near the coast
with a few degrees of warming further inland.
A broad area of low pressure extending from the Intermountain West
will dig south early next week, which will bring slightly cooler
conditions on Monday. For the middle to end of next week, more
uncertainty enters the forecast. Ensemble guidance is about 50/50 on
whether or not a trough or a ridge will be the main influence on
Southern California`s weather. This is emphasized by the 20 degree
spread in high temperatures between the 90th and 10th percentiles of
temperature guidance. If a more troughy pattern materializes near
California, it`s possible tropical moisture may be drawn northward
into the Southwestern United States, bringing an increase in cloud
coverage and a slight chance of showers. Right now the forecast
closely follows the NBM for the middle to end of next week.
&&
.AVIATION...
031515Z....Coasts/Valleys...Low clouds will continue to scatter out
for inland areas through 18Z, then for coastal areas 17-19Z, though
isolated patches of low clouds could linger along the coast through
20Z. Breezy west to northwest winds expected Friday afternoon, with
gusts to around 20 kts through around 02Z Saturday. Low clouds will
reform in patches after 4/00Z with bases mostly above 2000 ft MSL.
Clouds initially form in San Diego County foothills/valleys, then
spreading north overnight, but remain patchy for most locations.
Some areas of patchy drizzle may be possible, especially for the
foothills. There will begin clearing from inland to the coast on
Saturday between 15-17Z.
Mountains/Deserts...Mostly clear and VFR conditions through Friday
night. Stronger winds out of the west pick up and become more
widespread after 18Z Fri through the late afternoon, especially for
deserts and desert foothills, with gusts generally 25-35 kts except
for typically windy spots gusting to around 45 kts. Winds slowly
diminish after 06Z Saturday.
&&
.MARINE...
Northwest winds Friday afternoon and evening over the outer waters
will lead to hazardous conditions for small craft. Expecting
sustained winds 20 to 25 kts, with occasional gusts over 30 kts
possible, and choppy seas 5 to 8 feet. Winds will be strongest in
the vicinity of San Clemente Island. Winds weaken late Friday
evening. No hazardous marine conditions are expected Saturday
through Monday.
&&
.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory until 11 PM PDT this evening for Apple and Lucerne
     Valleys.
Wind Advisory from 4 PM this afternoon to 5 AM PDT Saturday for
     San Diego County Deserts.
Wind Advisory until 5 AM PDT Saturday for 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...Stewey

NWS SGX Office Area Forecast Discussion