Alpine, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

116
FXUS66 KSGX 060427
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
827 PM PST Thu Feb 5 2026

.SYNOPSIS...
Weakening Santa Ana winds today, with chances of light showers, mainly
for the mountains tonight into Friday. Dry and warm over the
weekend, with periods of weak Santa Ana winds. Pattern change
expected next week, with chances of widespread precipitation.

&&

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

This evening...Radar is showing weak, elevated convection moving
to the northwest but most of the precip is evaporating in the
deep and dry sub-cloud layer. In the last 6 hours, one location
has reported measurable precipitation and that was 0.01 inch.
Temperatures are generally lower than at this time yesterday, with
some locations west of the mtns as much as 10-15 degrees cooler.

From previous discussion...
Mid and high clouds are continuing to move northwest across the
area due to a closed upper level low off the coast of northern
Baja. The low is expected to slowly move northeast maintaining
fairly widespread cloud coverage and bringing isolated to
scattered light showers to the mountains and High Desert into
Friday. Any rainfall accumulations will be light with the
probability of rainfall totals exceeding 0.10" over 24 hours is 5
to 15 percent, highest in the San Bernardino mountains. Dry
conditions will return for the weekend.

Substantial cooling is expected between today and Friday. Highs on
Friday near the coast are expected to be 10 to 15 degrees cooler
than today with highs further inland expected to be 5 to 10 degrees
cooler than today. The cool down will be brief, with warmer
conditions expected for the weekend. By Sunday, highs for inland
locations will be back to 10 to 15 degrees above average. Along with
the warm conditions, weak Santa Ana winds are expected for coastal
mountain foothills and below passes. A change in the overall upper
level pattern is expected for next week. The effects will be felt as
early as Monday, with temperatures expected to be 3 to 5 degrees
cooler than Sunday. Further cooling is expected through next week.

A broad troughing pattern is expected to prevail over the West Coast
next week. This pattern will bring cooler conditions, the return of
onshore flow, and chances of widespread precipitation. About 30
percent of global ensemble clusters have the low in position to
bring us precipitation on Tuesday, with more guidance showing wetter
solutions for Wednesday and Thursday. Most of the individual
ensemble members are indicating mostly light rainfall amounts, with
only a few members showing moderate amounts. There remains quite a
bit of uncertainty in the details, especially when it comes to the
timing of any precipitation. Please continue to monitor the forecast
in coming days for more information.

&&

.AVIATION...
060400Z....Coast/Valleys...Low clouds based 800-1500ft MSL will
develop after 06Z and move inland in areas to 15-20 miles, with
periods of IFR/MVFR CIGs at coastal TAF sites. Bases are expected
to start out on the lower side then gradually rise overnight. Low
clouds are expected to be patchy, which may result in periods of
scattering out and conditions briefly returning to VFR. VIS
generally should be above 5SM everywhere except where clouds
intersect terrain. Low clouds scatter out 16-18Z Fri morning, then
return after 02Z Sat at 1500-2500 ft MSL.

High clouds AOA 15,000 ft MSL continuing to stream over the area,
moving out by early Friday morning. Slight chance of -SHRA mainly
over mountains and deserts through about 12Z, except for through 00Z
Sat for the San Bernardino Mtns, with cloud bases as low as 8000
feet MSL.

&&

.MARINE...
A building northwesterly swell (280 degrees) at 15-16 seconds will
bring seas of 6-9 feet in the outer waters near/around San Clemente
Island Friday and Saturday. This may also lead to localized steep,
rough conditions near the bay entrances, including the entrance to
the San Diego Bay/Zuniga Shoal area. Otherwise, no hazardous marine
conditions are expected through Tuesday.

&&

.BEACHES...
Increasing long-period (15-16 second) swell from the west-northwest
(280 degrees) will bring elevated to high surf of 5-8 feet with
locally higher sets to 10 feet Friday afternoon through early Sunday
morning. Impacts will be greatest at west facing beaches, especially
across southern San Diego County, and there will be a high risk for
rip currents. Further information can be found in the High Surf
Advisory. This may also lead to minor tidal overflow for low-lying
beach areas during high tide late Friday into early Saturday.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...High Surf Advisory from 10 AM Friday to 6 AM PST Sunday for
     Orange County Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

$$

PUBLIC...CO/PG
AVIATION/MARINE/BEACHES...CSP