Helendale, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

679
FXUS66 KSGX 141945 CCA
AFDSGX

Area Forecast Discussion...CORRECTED
National Weather Service San Diego CA
1145 AM PST Wed Jan 14 2026

.SYNOPSIS...
Periods of gusty Santa Ana winds will continue this afternoon
with weaker winds for Friday into early next week. Inland areas
will continue to warm today. There will be slight cooling for
today into Friday with not much change for the weekend. Cooling
is expected to spread inland next week as high pressure aloft
weakens and onshore flow spreads inland. Some return of night and
morning coastal low clouds and fog could occur as soon as late
Thursday night.

&&

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

Tonight through tomorrow night...

Very little has changed in terms of the forecast, with mild Santa
Ana conditions persisting through tomorrow night, and gradually
coming down. There will be a few passing high clouds. Today will be
the warmest day of the week, with temperatures within the inland
valleys and the IE getting up into the mid 80s for some areas. Gusty
winds, especially across the higher terrain and within the mountain
passes this afternoon, will begin to decouple and diminish going
into the later evening hours. Weak offshore winds and clear skies
overnight will lead to some sufficient radiational cooling, so some
of the wind-sheltered inland areas may get close to the freezing
mark again tonight, with some patchy frost being possible for
those areas. A few low clouds might develop during the early
morning hours along the coastal areas, although it is looking
better for the marine layer to return later this upcoming weekend.

Friday through Tuesday...

Mild to moderate Santa Ana conditions will continue to diminish by
Friday and gradually into the weekend as the pressure gradient
weakens with the ridge expanding northwestward. As this occurs, the
ridge axis will become more elongated and negatively tilted, which
will act as a blocking pattern and keep the dry conditions
persisting through the beginning of next week, with only a gradual
cooldown as some troughing to the east over central CONUS does help
to influence the region with cooler air advection from the north,
although with the ridge still in control, along with weak
downsloping winds, temperatures will remain above average. Offshore
winds will predominantly keep any development of the marine layer
mostly confined over the coastal waters, although there could be a
return of some fog/low clouds moving in over portions of the coast
and inland areas of San Diego and Orange counties beginning later in
the weekend. The development of the marine layer will continue to
become more prevalent going into early next week. There is also some
indication with some of the deterministic models which shows
possible subtropical influence from a weakening decaying wave moving
up from the southern Pacific Ocean along 120W, which may bring about
a slight chance of a shower/thunderstorm over the mountains of San
Diego County during the afternoon on Tuesday of next week, although
this is still quite far out and therefore is subject to change.
Looking beyond the forecast, ensembles are still hinting a return
in the chance of precipitation towards the end of next week as
there begins a change in the longwave pattern with a break down in
the ridge over the E Pac waters.

&&

.AVIATION...
141630Z...Clear skies and VFR conditions through Thursday morning.
Areas of east to northeast winds 20-30 kts mainly in foothills and
near mountain passes with corridors of 10-20 kts stretching into
into adjacent inland valleys for 18z until 03-06z this evening. Mod
up/downdrafts and local LLWS in lee of mountains.

&&

.MARINE...
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...Stewey
AVIATION/MARINE...Munyan