702
FXUS66 KSGX 282039
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1239 PM PST Wed Jan 28 2026

.SYNOPSIS...
Very warm weather is expected through Saturday as high pressure
builds into the region, where highs will be up to 20 degrees
above normal with light offshore winds. The high will weaken by
Sunday into Monday, increasing onshore flow and providing some
cooling to the region. A ridge will rebuild over the area by the
middle of next week, which will lead to warm and drier weather.

&&

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

Subtropical moisture is streaming in from the south and the
southwest via satellite imagery. These highs clouds will continue
to move over the region throughout the day, clearing from NW to SE
overnight. Cloud cover will help limit high temperatures today
with 70s in the inland valleys and lower deserts with 50s and
lower 60s for areas over 5,000 feet. Hi-res models show increasing
offshore winds through passes with winds gusting near 20-30 MPH by
this evening through Thursday.

A ridge of high pressure will continue to build into the area
Thursday through Saturday. This will bring very warm temperatures
to Southern California as skies clear out. Chances are moderate to
high to see high temperatures reaching 80 degrees for western
valleys to areas within 10 miles of the coast, as well as the
Coachella Valley. Breezy offshore flow will contribute to this
warming as the ridge builds in through Saturday. By Friday and
Saturday, very warm weather will occur over the area with
temperautres locally over 15 degrees above normal. We will
continue to refine the forecast, but model guidance has shown a
slight warming trend for these days with around a 30-50% chance of
seeing highs over 85 degrees for parts of the inland SD County
valleys, northern Orange County and western parts of the Inland
Empire. Though it is wintertime and the peak of the heat will not
last long in duration, make sure to check on neighbors. Temperatures
will peak in the afternoon with low temperatures dropping off
into the 50s and 60s for lower elevations. Offshore winds will be
fairly weak through this period, but highest for passes/foothills
across SD/RIV Counties on Friday afternoon with gusts 25-35 MPH.

High pressure will weaken by Sunday and Monday. This will increase
onshore flow and lower temperatures around 5 degrees west of the
mountains. The cooling will reach mountain areas by Monday. Monday
will be the coolest day of the week along and west of the
mountains with highs in the upper 60s near the coast with low to
mid 70s in the valleys, and 50s/60s across higher elevations.

Another ridge of high pressure will build into California by
Tuesday through the middle of next week. Models are in fair
agreement of this ridge moving over the region and increasing
temperatures yet again, where NBM shows a subtle warming trend by
next Tuesday into Wednesday. By this time, the ridge may amplify
all the way up into British Columbia/Alberta, Canada. A weak area
of low pressure moving into the Pacific Northwest may drift over
the ridge and drop southward into the Greab Basin by the middle of
next week, which would create an "inslider scenario". This would
lead to increased Santa Ana winds over our region with more warm
and dry weather.

&&

.AVIATION...282030Z...VFR conditions with SCT-BKN high clouds AOA
20000 feet MSL through this evening, clearing out late tonight into
Thursday morning. Afterwards, generally sunny skies. An uptick in
northerly winds over the mountains after 06z, increasing through
18z. There will be some spillover into the Inland Empire with wind
gusts up to 15-20kts after 16z.

&&

.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...APR
AVIATION/MARINE...Zuber

NWS San Diego (SGX) Office