Snow Valley

000
FXUS66 KSGX 312349
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
449 PM PDT Sat Oct 31 2026

.SYNOPSIS... 
Isolated light showers will continue for the coastal basin 
this morning. More widespread moderate showers develop late this
evening into Sunday morning, becoming more scattered during the
day Sunday before tapering off Sunday afternoon and evening. Dry 
and warmer for the remainder of the week with highs near to a few
degrees below normal each day.

&&

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


...UPDATED AVIATION DISCUSSION...

Satellite this afternoon depicts a broad region of clouds west of 
northern Baja streaming through a branch of the subtropical jet 
stream toward Socal. Radar is beginning to pick up on light rain 
west of San Clemente Island, set to arrive at the coast during the 
later afternoon hours, moving inland through the evening. High 
resolution models now agree that tonight's rainfall will be 
widespread and light region-wide, perhaps more intermittent in the 
high desert, with some brief pockets of moderate to heavy rainfall, 
especially for coastal areas and for San Diego County. Widespread 
rain turns into scattered showers and wrap up in the desert valleys 
Sunday morning. Showers become increasingly more isolated through 
the afternoon, tapering off for northern areas by Sunday evening, 
leaving behind a few isolated showers in San Diego County through 
Sunday night. 

Rain totals for this system will generally be higher for southern 
areas; SD County up to the mountains is expecting 0.75-1" of rain 
with locally high end amounts above 1.5". Orange County and the 
Inland Empire can expect 0.3-0.6" (more south and along foothills), 
with slightly higher totals in adjacent mountains. The deserts can 
generally expect 0.10-0.40" (more south) of generally light rain. 
Given that the system is bringing along subtropical moisture, the 
warm sector will bring snow levels above 10,000 feet tonight before 
dropping back to 7,500-8,000 ft. A dusting is possible above 8,000 
feet over the highest passes and peaks, otherwise, no snow is 
expected for any mountain communities.

As the upper level trough passes to our north Sunday afternoon, 
there will be a brief uptick in west/northwest winds over the 
waters, mountain ridges and desert slopes, with gusts 25-40 mph, 
weakening overnight into Monday.


As the storm exits the region, low temperatures will drop 
Monday/Tuesday morning to the upper-40s inland, upper 30s in the 
high desert and down into the low 30s and 20s in elevated mountain 
valleys. Patchy frost is possible in the high desert. 

Next week, a series of weak, fast-moving ridges and troughs will 
keep temperatures fluctuating, though gradually increasing by late 
week to the low to mid-80s regionwide for lower elevations. These 
are near average temperatures inland but above average for coastal 
areas. Generally expecting sunny skies with a few passing clouds 
Tuesday and Wednesday.

&&

.AVIATION... 
010000...Unbroken OVC mid-high level clouds region-wide through 
Sunday morning. FEW-SCT low clouds in the coastal basin will 
increase in coverage as widespread -RA moves into the region this 
evening. Intermittent MVFR cigs (2000-3000 ft) and vis (3-5SM) 
expected 03-15z Sun from the coast to the mtns. Most persistent MVFR 
conditions will be in San Diego County. Also, localized +SHRA in San 
Diego County and along the coastline may produce brief IFR 
conditions. -SHRA possible in the desrts 10-16Z Sun, but little to 
no cig/vis reductions expected. -RA will become more SCT from west 
to east 15-18z Sun with mid-high level clouds also clearing. 
Thereafter, ISO/SCT -SHRA will linger through Sunday evening in San 
Diego County and in the mtns.

&&

.MARINE...
There is a 5% chance of isolated thunderstorms Sunday morning. 
Westerly winds increase for Sunday afternoon and evening with gusts 
20-25 kt. A Small Craft Advisory has been issued for the outer 
coastal waters from 11AM - 9PM Sunday. Weaker winds expected Monday, 
followed by more elevated onshore winds Tuesday afternoon and 
evening, with gusts in the outer coastal waters potentially 
exceeding 20 knots.

&&

.BEACHES...
An increasing southwesterly swell (3 ft at 15 seconds from 200 
degrees) will bring elevated surf this weekend into Monday, with 
breaking wave heights 3 to 6 feet through Monday. While high tides 
will continue to wane through the weekend, tides will remain just 
above 6 feet which could still lead to local minor tidal overflow 
during high tides where breaking waves approach 5-6 feet, mostly on 
southwest facing beaches Sun.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory from 11 AM to 9 PM PDT Sunday for Waters 
     from San Mateo Point to the Mexican Border Extending 10 to 
     60 nm out including San Clemente Island.


&&

$$

PUBLIC...Westerink
AVIATION/MARINE/BEACHES...KW