739
FXUS66 KSGX 270426
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
926 PM PDT SUN APR 26 2026
SYNOPSIS
ISOLATED LIGHT SHOWERS WEST OF THE MOUNTAINS TONIGHT ALONG WITH
DECREASING WEST WINDS IN THE MOUNTAINS AND DESERTS. WARMER EARLY
THIS WEEK, THEN MINOR COOLING AND A SLIGHT CHANCE OF PRECIPITATION
TOWARDS THE MIDDLE OF THE WEEK. WARMER AND DRIER FOR THE END OF
THE WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
EVENING UPDATE...
NO PRECIPITATION IS EVIDENT ON RADAR OR GAUGES THIS EVENING. A
SECONDARY SHORT WAVE IS DROPPING SOUTH TO NEAR POINT CONCEPTION
AND WILL MOVE INTO SO CAL TONIGHT INTO MONDAY MORNING. THIS WILL
PRODUCE ANOTHER ROUND OF ISOLATED LIGHT SHOWERS ALONG AND WEST OF
THE MOUNTAINS. ADDITIONAL RAINFALL ACCUMULATION IS EXPECTED TO BE
AROUND 0.10" OR LESS, AND MANY LOCATIONS MAY RECEIVE NONE. THE
SNOW LEVEL WILL FALL TO AROUND 5500 FT WITH ANY ACCUMULATION LESS
THAN ONE INCH. OTHERWISE BREEZY WEST WINDS IN THE MOUNTAINS AND
DESERTS WEAKEN OVERNIGHT. MONDAY REMAINS COOL WITH HIGH
TEMPERATURES AS MUCH AS 10-15 DEGREES BELOW NORMAL INLAND, AND
AROUND 3-8 DEGREES BELOW NORMAL CLOSER TO THE COAST.
PREVIOUS DISCUSSION...
FAIR WEATHER WITH A WARMING TREND WILL BEGIN ON TUESDAY AND
CONTINUE THROUGH WEDNESDAY AS A LOW PRESSURE SYSTEM MOVES SOUTH
OUT OF THE GULF OF ALASKA AND A WEAK RIDGE OF HIGH PRESSURE
DEVELOPS OVER THE DESERT SOUTHWEST. WEDNESDAY WILL LIKELY BE THE
WARMEST DAY WITH TEMPERATURES RANGING FROM A FEW DEGREES BELOW TO
A FEW DEGREES ABOVE SEASONAL AVERAGES.
NUMERICAL MODELS HAVE ADJUSTED SOLUTIONS TO SLOW DOWN THE
PROGRESS OF THE GULF OF AK LOW SO THAT IT DOESN'T MOVE INTO
SOCAL/NORTHERN BAJA UNTIL THURSDAY. THIS MEANS THAT WE'RE UNLIKELY
TO SEE ANY PRECIPITATION FROM THIS SYSTEM UNTIL LATE WEDNESDAY/EARLY
THURSDAY. MODELS ARE IN PRETTY GOOD AGREEMENT THROUGH THURSDAY WITH
RESPECT TO THE SYNOPTIC PATTERN, SHOWING THE CLOSED UPPER LOW
MOVING OVER NORTHERN BAJA LATE THURSDAY. THIS TRAJECTORY COULD
BRING US PRECIP ON THURSDAY BUT NOT MUCH IN THE WAY OF WINDS OR
COLD AIR. TEMPERATURES ON THURSDAY WILL LIKELY BE GENERALLY NEAR
OR A LITTLE BELOW SEASONAL AVERAGES.
DRY AND WARMER FOR FRIDAY AND SATURDAY UNDER A TRANSIENT RIDGE OF
HIGH PRESSURE BETWEEN THE DEPARTING SYSTEM MOVING INTO THE
SOUTHERN ROCKIES AND ANOTHER LOW PRESSURE SYSTEM MOVING IN FROM
THE NORTHWEST.
AVIATION
270000Z....COAST/VALLEYS...VFR CONDITIONS WITH SCT-BKN CUMULUS FIELD
BASED AROUND 3000-4000FT MSL IS PERSISTING ACROSS THE COASTAL BASIN
THIS AFTERNOON. GUSTY WESTERLY WINDS UP TO 15-20 KTS WILL GRADUALLY
DIMINISH BY 01-02 MONDAY. ANOTHER ROUND OF VCSH IS SET TO MOVE
THROUGH THE COASTAL BASIN STARTING 06Z MONDAY. ANY SHOWERS WILL BE
FAIRLY LIGHT AND PROVIDE LITTLE TO NOT IMPACT TO ANY TAF SITES
BEFORE EVENTUALLY CLEARING OUT BY 18Z. CUMULUS LIKELY LESS NUMEROUS
AFTER 18Z MONDAY.
MOUNTAINS/DESERTS
GUSTY WEST WINDS WITH SURFACE SPEEDS UP TO 20-
30 KTS, LOCALLY HIGHER THROUGH MOUNTAIN PASSES AND NEAR RIDGELINES,
DYING DOWN BY 12Z MONDAY MOD TO STRONG UP/DOWNDRAFTS NEAR PEAKS AND
ON DESERT SLOPES. PERIODIC REDUCED VIS DUE TO BLDU.
MARINE
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...WIND ADVISORY UNTIL 2 AM PDT MONDAY FOR APPLE AND LUCERNE
VALLEYS-COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-SAN
GORGONIO PASS NEAR BANNING.
PZ...NONE.
PUBLIC...SS/PG
AVIATION/MARINE...MUNYAN
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