Alpine, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

775
FXUS66 KSGX 020959
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
259 AM PDT Wed Apr 2 2025

.SYNOPSIS...
A low pressure system over the southwest states will maintain
cooler than average temperatures through Thursday. There will be
occasional showers through Thursday afternoon into Thursday
evening with the greatest coverage and amounts over the mountains.
Then dry and warmer for the weekend into next week with high
temperatures warming to around average over the weekend and to 10
to 15 degrees above average for inland areas for the middle of
next week.

&&

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

.SHORT TERM (Today through Friday)...
A low pressure system over the southwest states will maintain
cooler than average temperatures through Thursday. It will begin
to weaken and move east on Friday.

There will be periods of showers at times through Thursday into
Thursday evening with the greatest coverage over the mountains and
for San Diego County from the coast to the mountains. Rainfall and
liquid-equivalent above the snow level will range from one-tenth
inch or less near the coast to one-quarter to one-half inch in the
mountains with locally greater amounts. There is also a slight
chance of thunderstorms for inland areas on Thursday afternoon.

A snow level near 3500 to 4000 feet early this morning will rise
to 4500 to 5000 feet this afternoon, lower to 4000 to 4500 feet
late tonight, then rise to 5000 to 5500 feet during Thursday
afternoon into Thursday evening. Snowfall of a few inches is
possible above 5000 feet with locally 4 to 7 inches above 7500
feet.

Warming and drying will begin on Friday. High temperatures on
Friday will be around 5 degrees warmer near the coast to 8 to 12
degrees warmer for inland areas. There is a slight chance of
showers for the mountains and inland valleys on Friday afternoon
from residual moisture.

&&

.LONG TERM (Saturday through Tuesday)...
Dry weather with warming will continue for the weekend with high
temperatures warming to around average. A weak low pressure
pressure system moving inland through northern California on
Sunday night into Monday with slow the warming on Monday.
Strengthening high pressure over the western states will bring
greater warming for the middle and latter part of next week with
temperatures 10 to 15 degrees above average for inland areas. High
temperatures on Wednesday will range from the lower to mid 70s
near the coast to the mid 80s to lower 90s for the inland valleys
with high temperatures in the mid to upper 90s for the lower
deserts.

&&

.AVIATION...
020930Z...Coast/Valleys/Coastal Mountain Slopes...SCT to
occasionally BKN clouds based between 2500-4500 feet MSL with tops
reaching 7000 feet will continue today and tonight. Cigs below 3000
feet MSL and -SHRA most likely far inland against the coastal slopes
and in San Diego County. Predominantly SCT conditions vcnty KSNA.
West-northwest winds gusting 25-30 kts today near the coast. Clouds
will lower, -SHRA return, and winds will gradually diminish after
02Z. Cloud bases 2000-3000 feet MSL, lowest in -SHRA, after 02Z into
Thursday, most likely near mountains and in San Diego County.

Desert Mountain Slopes/Deserts...Mostly clear skies today and
tonight. Westerly winds with gusts 30-40 kts over the ridges,
through mountain passes, and locally into adjacent deserts will
continue to diminish this morning. Winds 25-35 kts will be more
isolated in these areas through the day and tonight. Areas of
moderate up/downdrafts, including localized LLWS and rotors, in lee
of mountains (i.e., vcnty KPSP), most prevalent this morning, with
lower chances thereafter.

&&

.MARINE...
Gales and steep seas will continue this morning, diminishing
slightly late this morning. Hazardous winds and seas will continue
across all coastal waters through the afternoon, but through early
Thursday in the outer waters. See the Gale Warning and the Small
Craft Advisory for details. Winds and seas will continue to diminish
Thursday and beyond, and no additional hazardous marine conditions
are expected Thursday through Sunday.

&&

.BEACHES...
Surf of 4 to 7 feet with local sets to 9 feet in San Diego County
will generate dangerous rip currents, hazardous swimming conditions,
and localized beach erosion this morning. Surf will gradually
subside thereafter. The High Surf Advisory, in effect through noon,
contains the details.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...High Surf Advisory until noon PDT today for San Diego County
     Coastal Areas.

PZ...Small Craft Advisory until 5 PM PDT this afternoon for Coastal
     Waters from San Mateo Point to the Mexican Border and out
     to 10 nm.

     Gale Warning until 9 AM PDT this morning for Waters from San
     Mateo Point to the Mexican Border Extending 10 to 60 nm out
     including San Clemente Island.

     Small Craft Advisory from 9 AM this morning to 7 AM PDT Thursday
     for Waters from San Mateo Point to the Mexican Border
     Extending 10 to 60 nm out including San Clemente Island.


&&

$$

PUBLIC...17
AVIATION/MARINE/BEACHES...MM