704
FXUS66 KSGX 011051
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
351 AM PDT TUE APR 1 2025
SYNOPSIS
A LOW PRESSURE SYSTEM OVER THE SOUTHWEST STATES WILL MAINTAIN
COOLER CONDITIONS INTO THURSDAY ALONG WITH OCCASIONAL PERIODS OF
SHOWERS ALONG WITH A SLIGHT CHANCE OF THUNDERSTORMS FOR THURSDAY
AFTERNOON. THERE WILL ALSO BE PERIODS OF STRONGER AND GUSTY WEST
WINDS THROUGH TONIGHT WITH THE STRONGER GUSTS FOR THE MOUNTAINS
AND DESERTS TO 45 TO 55 MPH. THEN DRY WITH A WARMING TREND FOR THE
WEEKEND INTO NEXT WEEK WITH HIGH TEMPERATURES WARMING TO AROUND
AVERAGE OVER THE WEEKEND AND ABOVE AVERAGE 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 THURSDAY)
STRONGER ONSHORE FLOW WILL CONTINUE TODAY WITH AREAS OF STRONG AND
GUSTY WEST WINDS CONTINUING FOR THE MOUNTAINS AND DESERTS THROUGH
TONIGHT WITH THE STRONGER GUSTS TO 45 TO 55 MPH WITH ISOLATED
STRONGER GUSTS. FOR THE COAST AND VALLEYS, THE STRONGER WINDS ARE
EXPECTED DURING THE AFTERNOON AND EARLY EVENING WITH GUSTS TO 30
TO 40 MPH NEAR THE COAST AND 25 TO 35 MPH FOR THE INLAND EMPIRE.
COOLING WILL SPREAD INLAND WITH THE COAST A FEW DEGREES COOLER
THAN MONDAY TO AROUND 10 DEGREES COOLER FOR THE DESERTS. SCATTERED,
MOSTLY LIGHT SHOWERS WILL CONTINUE NEAR THE MOUNTAINS TODAY WITH
ADDITIONAL RAINFALL IN THE MOUNTAINS OF ONE-TENTH TO ONE-QUARTER
INCH WITH SNOWFALL OF AROUND ONE INCH ABOVE 7000 FEET.
ANOTHER LOW PRESSURE SYSTEM FROM THE NORTH WILL MOVE THROUGH
CALIFORNIA TONIGHT AND WEDNESDAY BRINGING ANOTHER ROUND OF
SHOWERS WITH THE SNOW LEVEL FALLING TO 3000 TO 4000 FEET LATE
TONIGHT AND RISING TO AROUND 4500 FEET FOR WEDNESDAY AFTERNOON.
ADDITIONAL RAINFALL AND LIQUID-EQUIVALENT ABOVE THE SNOW LEVEL IS
EXPECTED TO RANGE FROM ONE-TENTH INCH OR LESS NEAR THE COAST TO
ONE-QUARTER TO ONE-HALF INCH IN THE MOUNTAINS WITH LOCALLY GREATER
AMOUNTS. SNOWFALL OF 3 TO 5 INCHES IS POSSIBLE, MOSTLY ABOVE 5000
TO 5500 FEET.
ANOTHER ROUND OF SHOWERS IS POSSIBLE FOR WEDNESDAY NIGHT INTO
THURSDAY EVENING WITH A SNOW LEVEL OF 4000 TO 4500 FEET FOR
WEDNESDAY NIGHT RISING TO 5000 TO 5500 FEET FOR THURSDAY AFTERNOON
AND EVENING. ADDITIONAL RAINFALL AND LIQUID-EQUIVALENT ABOVE THE
SNOW LEVEL IS EXPECTED TO RANGE FROM ONE-TENTH INCH OR LESS NEAR
THE COAST TO TO AROUND ONE-QUARTER INCH IN THE MOUNTAINS WITH
LOCALLY GREATER AMOUNTS. SNOWFALL OF 3 TO 5 INCHES IS POSSIBLE,
MOSTLY ABOVE 5000 TO 5500 FEET WITH LOCALLY 5 TO 9 INCHES ON THE
HIGHER PEAKS ABOVE 7500 FEET. THERE IS ALSO A SLIGHT CHANCE OF
THUNDERSTORMS FOR THURSDAY AFTERNOON.
LONG TERM (FRIDAY THROUGH MONDAY)
UPPER LEVEL LOW PRESSURE OVER THE SOUTHWEST STATES WILL BEGIN TO
MOVE EAST INTO THE PLAINS AND WEAKEN FOR FRIDAY AND SATURDAY. HIGH
PRESSURE ALOFT WILL MOVE ACROSS CALIFORNIA ON SUNDAY WITH A WEAK
LOW PRESSURE SYSTEM MOVING QUICKLY INLAND NORTH OF POINT
CONCEPTION AROUND MONDAY.
THERE WILL BE WARMING FOR FRIDAY THROUGH SUNDAY WITH HIGH
TEMPERATURES WARMING TO AROUND AVERAGE OVER THE WEEKEND. THE LOW
PRESSURE SYSTEM MOVING INLAND THROUGH NORTHERN AND CENTRAL
CALIFORNIA AROUND MONDAY WILL BRING STRONGER ONSHORE FLOW TO
SOUTHERN CALIFORNIA WITH SLIGHT COOLING AND GUSTY WEST WINDS FOR
THE MOUNTAINS AND DESERTS.
AVIATION
010930Z...COAST/VALLEYS/FOOTHILLS...SCT LOW CLOUDS NEAR COAST WITH
BKN LOW CLOUDS FARTHER INLAND IN THE FOOTHILLS. CIGS BETWEEN 2000-
3500 FEET MSL WITH TOPS TO 6000 FEET. AREAS OF COASTAL FOOTHILLS
OBSCURED IN FG/DZ. SOME CIGS AROUND 2000 FEET MSL TO FORM NEAR COAST
14-17Z, BUT MOST OF COAST AND VALLEYS WILL SCATTER OUT AFTER 17Z.
NORTHWEST WIND GUSTS ALONG COAST 20-25 KTS AFTER 16Z. LOW CLOUDS
BASED AT 1500-2500 FEET MSL WILL INCREASE AFTER 02Z, MAINLY IN SAN
DIEGO COUNTY.
HIGHER MOUNTAINS/DESERTS...SCT-BKN CLOUDS AOA 15000 FEET MSL. AREAS
OF HIGH DESERT BKN CLOUDS 4000 FEET MSL. WESTERLY WINDS WILL
CONTINUE, INCREASING AFTER 20Z WITH GUSTS 35-55 KTS OVER THE RIDGES
AND IN WIND-PRONE MOUNTAIN PASSES, WITH GUSTS 25-35 KTS WITHIN THE
OPEN DESERTS. AREAS OF MODERATE UP/DOWNDRAFTS, INCLUDING LOCALIZED
LLWS AND ROTORS, IN LEE OF MOUNTAINS (I.E., VCNTY KPSP).
MARINE
WINDS INCREASE AND SEAS BUILD TODAY, WITH GALES AND STEEP SEAS IN
THE OUTER WATERS AND HAZARDOUS WINDS AND SEAS IN THE INNER WATERS
THROUGH WEDNESDAY MORNING. WINDS AND SEAS DIMINISH SOME ON WEDNESDAY
BUT HAZARDOUS CONDITIONS PERSIST THROUGH WEDNESDAY EVENING IN THE
OUTER WATERS. CHECK THE GALE WARNING AND THE SMALL CRAFT ADVISORY
FOR DETAILS.
BEACHES
ELEVATED SURF OF 3-6 FEET WITH SETS TO 7 FEET ARE EXPECTED TODAY
THROUGH WEDNESDAY, WITH ASSOCIATED HIGH RIP CURRENT RISK.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...WIND ADVISORY FROM NOON TODAY TO 2 AM PDT WEDNESDAY FOR ORANGE
COUNTY COASTAL AREAS-ORANGE COUNTY INLAND AREAS-SAN
BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY COASTAL AREAS-SAN DIEGO COUNTY VALLEYS-
SANTA ANA MOUNTAINS AND FOOTHILLS.
WIND ADVISORY UNTIL 2 AM PDT WEDNESDAY FOR APPLE AND LUCERNE
VALLEYS-COACHELLA VALLEY-RIVERSIDE COUNTY MOUNTAINS-SAN
BERNARDINO COUNTY MOUNTAINS-SAN DIEGO COUNTY DESERTS-SAN
DIEGO COUNTY MOUNTAINS-SAN GORGONIO PASS NEAR BANNING.
PZ...SMALL CRAFT ADVISORY UNTIL 9 AM PDT WEDNESDAY FOR COASTAL WATERS
FROM SAN MATEO POINT TO THE MEXICAN BORDER AND OUT TO 10 NM.
SMALL CRAFT ADVISORY UNTIL 3 PM PDT THIS AFTERNOON 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 TO 11 PM PDT WEDNESDAY FOR WATERS
FROM SAN MATEO POINT TO THE MEXICAN BORDER EXTENDING 10 TO
60 NM OUT INCLUDING SAN CLEMENTE ISLAND.
GALE WARNING FROM 3 PM THIS AFTERNOON TO 9 AM PDT WEDNESDAY 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
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