Belltown, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

182
FXUS66 KSGX 020539
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
939 PM PST Sun Feb 1 2026

.SYNOPSIS...
Slightly cooler conditions expected into Monday. Patchy dense fog is
possible over the coastal waters and along the immediate coast
tonight into Monday, with the potential for patchy dense fog to
develop Monday night into Tuesday. Warmer conditions return for the
middle to end of next week, with periods of Santa Ana winds. Cooler
conditions and onshore flow return for the end of the week.

&&

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

Update: The forecast continues to remain on track, with a weak
trough passing to the north and then a rex blocking pattern setting
up thereafter going into the middle of the week, with an upper level
ridge to the north and an upper level low to the south. The pressure
gradient will cause mild Santa Ana conditions to return to the area
and lead to a gradual warmup through Wednesday. After that, there
will be a cooldown from Thursday through next weekend. There may
also be a slight chance of rain as the trough begins to transition
over the western states and possibly allows an area of low pressure
to drop down over SoCal, although at this time there is too much
disagreement with the deterministic models to have high confidence
of this, although ensembles do reflect that we will be returning to
a more active weather pattern going into the latter part of the
weekend and into early next week.

Previous discussion submitted at 1131 AM:

Weak onshore flow returns for today and Monday as a weak trough
moves across the West Coast. This will allow the marine layer to
rebuild after a period of prevailing offshore flow. Patchy dense fog
is expected to develop tonight over the coastal waters and along the
immediate coast. Areas of visibility of 1 mile or less may impact
travel at times. Patchy dense fog may redevelop for Monday night
into Tuesday for similar areas and with similar impacts.

Highs today are expected to be a few degrees cooler than yesterday
along the coast and western valleys, with cooling spreading further
inland for Monday. Even with widespread cooler conditions on Monday,
highs will remain 5 to 10 degrees above average, locally up to 15
degrees above average in the mountains. By Tuesday, an upper level
high pressure will settle over the West Coast, kicking off another
period of warming. Wednesday is currently forecast to be the warmest
day of the week. West of the mountains widespread highs in the upper
70s to upper 80s, locally low 90s are expected. The mountains and
High Desert will see highs in the upper 60s to low 70s, with highs
in the low desert in the 80s. The majority of global ensembles show
the upper level high pressure shifting east on Thursday, which will
allow for a few degrees of cooling across the area but maintain
above average temperatures.

With the upper level ridge in place over the Western United States,
a surface high is expected to form over the Great Basin for the
middle to end of the week. This will bring another period of Santa
Ana winds. The CW3E West-WRF ensemble guidance maintains a 60 to 80
percent chance of a weak to moderate wind event with a 30 percent
chance of a moderate wind event for Wednesday and Thursday. Current
guidance indicates locations more prone to easterly/northeasterly
winds will be more impacted than areas more prone to northerly
winds.

Uncertainty grows for Friday onward as ensemble solutions begin to
diverge on the evolution of the upper level pattern, particularly
with the progression of an upper low moving into the West Coast. A
cooling trend for Friday and Saturday looks likely, but how much
cooling we`ll see will depend on how the low tracks. A few members
of each of the global ensembles are producing light precipitation
with this low over the weekend, but not enough to introduce a slight
chance into the forecast. The alternative to any precipitation would
be another round of offshore flow and warming conditions by Sunday.

&&

.AVIATION...
020400...Coastal locations beginning along south San Diego will see low
clouds and patchy fog moving in after 09Z with a 45% chance of vis less
than 2 SM. Areas further north along the coast are expected to see
patchy fog after 13Z but with only a 10% chance of vis less than 5 SM.
Low clouds and fog will clear around 15-17Z. Everywhere else, VFR
conditions expected through the TAF period.

&&

.MARINE...
Patchy fog likely to develop over the coastal waters overnight through
late Monday morning, with areas of visibility under 1 SM possible.
Otherwise, no hazardous marine conditions are expected through Thursday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Coastal Flood Advisory from 4 AM Monday to 10 AM PST Tuesday for
     San Diego County Coastal Areas.

     High Surf Advisory from 4 AM Monday to 10 AM PST Tuesday for San
     Diego County Coastal Areas.

     Beach Hazards Statement from 4 AM PST Monday through Monday
     evening for Orange County Coastal Areas.

PZ...Coastal Flood Advisory from 4 AM Monday to 10 AM PST Tuesday for
     Coastal Waters from San Mateo Point to the Mexican Border
     and out to 10 nm.

     High Surf Advisory from 4 AM Monday to 10 AM PST Tuesday for
     Coastal Waters from San Mateo Point to the Mexican Border
     and out to 10 nm.


&&

$$

UPDATE...Stewey
PUBLIC...CO
AVIATION/MARINE...Villafane