023
FXUS66 KSGX 091829
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1129 AM PDT THU APR 9 2026
SYNOPSIS
TWO AREAS OF LOW PRESSURE WILL NEAR THE REGION INTO EARLY NEXT
WEEK, BRINGING INCREASED WINDS FOR INLAND AREAS. THIS WILL ALSO
BRING COOLER WEATHER WITH THE CHANCE OF LIGHT TO MODERATE
RAINFALL. THE HEAVIEST RAINFALL AND MOUNTAIN SNOWFALL IS EXPECTED
ON SUNDAY, WHERE THERE IS A SLIGHT CHANCE OF THUNDERSTORMS WEST OF
THE MOUNTAINS. THE WEATHER SYSTEM MAY LINGER OVER THE AREA INTO
MONDAY, BRINGING ADDITIONAL LIGHT SHOWERS. DRIER AND SLIGHTLY
WARMER WEATHER IS EXPECTED BY THE MIDDLE AND END OF NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SATELLITE IMAGERY SHOWS A COASTAL EDDY OVER THE CALIFORNIA BIGHT,
WHERE LOW CLOUDS ARE BEGINNING TO MIX OUT NEAR THE COAST AND OVER
THE WATERS. AN AREA OF LOW PRESSURE IS ALSO SEEN ABOUT 400 WEST
OF SAN FRANCISCO, WHICH IS HELP STREAM IN HIGHER CLOUDS FROM THE
SOUTHWEST. TODAY WILL BE THE FINAL DAY OF ABOVE NORMAL
TEMPERATURES FOR THIS WEEK AS THIS WEATHER SYSTEM NEARS OUR
REGION. INCREASED ONSHORE FLOW WILL OCCUR ACROSS THE AREA WITH
ELEVATED WINDS ACROSS THE MOUNTAINS AND DESERTS WITH WINDS GUSTING
NEAR 25-45 MPH. THE LOW WILL MOVE CLOSER TO THE REGION FRIDAY,
USHERING IN COOLER WEATHER. HIGHS WEST OF THE MOUNTAINS INTO THE
HIGH DESERT WILL EITHER BE IN THE 60S OR 70S, WITH PALM SPRINGS
SEEING ONLY A 25% CHANCE OF HITTING 90 DEGREES. WEST WINDS WILL BE
PRETTY SIMILAR TO THURSDAY'S WINDS ACROSS MOUNTAINS AND DESERTS.
THE LOW PRESSURE SYSTEM NEAR THE BAY AREA AND ANOTHER CURRENTLY IN
THE GULF OF ALASKA WILL MOVE INTO THE REGION OVER THE NEXT FEW
DAYS. THE FIRST SYSTEM LOOKS TO BE WEAKER AND STAY FURTHER TO THE
NORTH. THE LOW PRESSURE SYSTEM NEAR THE BAY AREA WILL MOVE NEAR
OUR REGION BY FRIDAY NIGHT INTO SATURDAY. MODELS CONTINUE TO SHOW
A DOWNWARD TREND IN PRECIPITATION DURING THIS TIME WITH MOSTLY DRY
CONDITIONS WITH ISOLATED LIGHT SHOWERS ALONG AND WEST OF THE
MOUNTAINS EARLY FRIDAY EVENING INTO SATURDAY MORNING.
ACCUMULATIONS WILL MOSTLY BE A FEW HUNDREDTHS FOR THE COAST /
VALLEYS TO NEAR ONE QUARTER INCH ACROSS THE MOUNTAIN COASTAL
SLOPES.
THE AREA OF LOW PRESSURE SITUATED IN THE GULF OF ALASKA LOOKS TO
BE MORE POTENT. THIS WILL BRING A GREATER CHANCE FOR MORE
WIDESPREAD SHOWERS ACROSS THE REGION. PREFRONTAL SHOWERS WILL
BEGIN AS EARLY AS SATURDAY EVENING WEST OF THE MOUNTAINS WITH
SHOWERS BECOMING MORE WIDESPREAD OVERNIGHT INTO SUNDAY MORNING OR
AFTERNOON. THIS SYSTEM WILL BE COLDER, SO THE CHANCE FOR
THUNDERSTORMS HAS INCREASED FOR AREAS WEST OF THE MOUNTAINS ON
SUNDAY. MOST AREAS WEST OF THE MOUNTAINS ON SUNDAY WILL SEE NEAR
0.25-0.50" OF RAINFALL (NBM CHANCE FOR GREATER THAN ONE HALF INCH
OVER THIS AREA IS 20-40%). SNOW LEVELS WILL START TO FALL BELOW
7,000 FEET BY SATURDAY NIGHT, GOING DOWN NEAR 5,500 FEET BY
SUNDAY NIGHT. AREAS LIKE WRIGHTWOOD AND BIG BEAR LAKE HAVE NEAR A
25-40% CHANCE TO SEE SNOWFALL OVER 1 INCH. MODEL GUIDANCE
CONTINUES TO BE IN FAIR AGREEMENT ON THE POTENT AREA OF LOW
PRESSURE BECOMING A MORE OPEN WAVE TROUGH, WHERE ANOTHER WEAK
SHORTWAVE MAY MOVE OVER THE AREA INTO MONDAY. IF THIS OCCURS,
ADDITIONAL LIGHT PRECIPITATION WOULD OCCUR, INCLUDING LIGHT
MOUNTAIN SNOW. SUNDAY AND MONDAY WILL BE THE COOLEST DAYS OF THE
NEXT WEEK. HIGH TEMPERATURES WILL BE AROUND 5 TO 15 DEGREES BELOW
NORMAL. MOUNTAIN COMMUNITIES WILL HAVE HIGHS IN THE 40S AND LOWS
IN THE 20S AND 30S WITH MAINLY HIGHS IN THE 60S WEST OF THE
MOUNTAINS INTO THE HIGH DESERT. COMFORTABLE TEMPERATURES FOR THE
COACHELLA VALLEY WILL OCCUR THIS WEEKEND WITH HIGHS IN THE 80S ON
SATURDAY TO 70S ON SUNDAY.
TUESDAY INTO THE LATTER PART OF NEXT WEEK LOOKS DRY AS WEAK
TROUGHING OCCURS. THIS WILL KEEP TEMPERATURES IN CHECK WITH HIGHS
CLOSER TO NORMAL WITH LIGHTER WINDS.
AVIATION
091630Z...COASTS/VALLEYS...AREAS OF LOW CLOUDS BASED 900-1400 FT MSL
ARE CURRENTLY LINGERING OVER COASTAL AREAS UP TO 5 MILES INLAND.
REMAINING LOW CLOUDS WILL SCATTER OUT BY 18Z. LOW CLOUDS RETURN
INITIALLY TO COASTAL SAN DIEGO COUNTY 00-03Z FRI WITH SLIGHTLY
HIGHER BASES. BASES SLOWLY CONTINUE TO RISE OVERNIGHT AS CLOUDS
EXPAND NORTHWARD AND INLAND, REACHING INTO THE INLAND EMPIRE BY 09-
12Z. CLOUDS SCATTER TOWARD THE COAST AGAIN 15-18Z.
MOUNTAINS/DESERTS
WEST TO SOUTHWEST WINDS BECOME ELEVATED AGAIN
STARTING 21Z THU-00Z FRI WITH GUSTS 35-45 KTS THROUGH PASSES, ALONG
DESERTS SLOPES AND INTO THE HIGH DESERT. GUSTS 25-40 KTS THROUGH THE
LOWER DESERTS. AREAS BLDU (VIS 3-5SM) EXPECTED. MODERATE
UP/DOWNDRAFTS IN LEE OF MTNS. WINDS BRIEFLY WEAKEN LATE FRIDAY
MORNING BEFORE STRENGTHENING AGAIN LATE FRIDAY AFTERNOON.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH MONDAY, EXCEPT
FOR SUNDAY, WHEN THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ALONG
WITH STRONGER NORTHWEST WINDS AND CHOPPY SEAS THAT COULD GENERATE
HAZARDOUS CONDITIONS.
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...KW
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