056
FXUS66 KSGX 181017
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
217 AM PST TUE FEB 18 2025
SYNOPSIS
COOLING WILL SPREAD INLAND TODAY. WARMER FOR WEDNESDAY WITH SLIGHT
COOLING SPREADING INLAND FOR THURSDAY AND FRIDAY, THEN WARMING
THROUGH SUNDAY AND MONDAY. A COASTAL EDDY WILL MAINTAIN A GREATER
MARINE INFLUENCE FOR THE COAST AND VALLEYS INTO THURSDAY. LOW
CLOUDS WILL COVER MUCH OF THE COAST AND VALLEYS EARLY THIS
MORNING, THEN NOT SPREAD AS FAR INTO THE VALLEYS EACH NIGHT AS THE
MARINE LAYER SLOWLY DECREASES IN DEPTH FOR WEDNESDAY AND THURSDAY.
FOR THURSDAY MORNING THROUGH EVENING, THERE WILL BE WEAK OFFSHORE
FLOW WITH GUSTY NORTH WINDS ALONG AND BELOW THE COASTAL SLOPES OF
THE MOUNTAINS WITH THE STRONGER GUSTS MOSTLY 35 MPH OR LESS.
WITH THE WARMING, HIGH TEMPERATURES FOR NEXT MONDAY WILL BE
AROUND 5 DEGREES ABOVE AVERAGE NEAR THE COAST TO AS MUCH AS 15 TO
20 DEGREES ABOVE AVERAGE FOR THE MOUNTAINS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH THURSDAY)
THERE IS A COASTAL EDDY EARLY THIS MORNING WITH SOUTH TO SOUTHEAST
WINDS ALONG THE COAST THAT GUSTED TO 18 MPH AT SAN DIEGO
INTERNATIONAL AIRPORT AROUND MIDNIGHT. THE MARINE LAYER CONTINUES
TO DEEPEN WITH LOW CLOUDS EXPECTED TO COVER MUCH OF THE COAST AND
VALLEYS EARLY THIS MORNING. A WEAKER COASTAL EDDY WILL CONTINUE AT
TIMES INTO WEDNESDAY AND EARLY THURSDAY, BUT WITH THE MARINE
LAYER DEPTH DECREASING SLOWLY EACH NIGHT WITH NIGHT AND MORNING
COASTAL LOW CLOUDS NOT SPREADING AS FAR INTO THE VALLEYS.
IT WILL BE COOLER INLAND TODAY AND A LITTLE WARMER ON WEDNESDAY.
SLIGHT COOLING WILL BEGIN TO SPREAD INLAND INTO THE COAST AND
VALLEYS ON THURSDAY, THEN SPREAD INTO THE DESERTS ON FRIDAY AS
COASTAL AREAS BEGIN TO WARM. FOR THURSDAY MORNING THROUGH EVENING,
THERE WILL BE WEAK OFFSHORE FLOW WITH GUSTY NORTH WINDS ALONG AND
BELOW THE COASTAL SLOPES OF THE MOUNTAINS WITH THE STRONGER GUSTS
MOSTLY 35 MPH OR LESS.
LONG TERM (FRIDAY THROUGH MONDAY)
HIGH PRESSURE ALOFT ACROSS CALIFORNIA WILL BRING A WARMING TREND
THROUGH SUNDAY AND MONDAY WITH MONDAY HIGH TEMPERATURES AROUND 5
DEGREES ABOVE AVERAGE NEAR THE COAST TO 15 TO 20 DEGREES ABOVE
AVERAGE FOR THE MOUNTAINS. HIGH TEMPERATURES ON MONDAY WILL BE
AROUND 70 NEAR THE COAST TO THE MID 70S TO LOWER 80S FOR THE
VALLEYS AND IN THE MID TO UPPER 80S FOR THE LOWER DESERTS.
AVIATION
181000Z...COAST/VALLEYS...LOW CLOUDS BASED AT 1500-2000 FT MSL WITH
TOPS TO 2500 FT MSL HAVE MOVED INTO THE MAJORITY OF THE COASTAL
BASIN THIS MORNING, AND WILL CONTINUE TO FILTER INTO THE INLAND
EMPIRE THROUGH ABOUT 13Z. VIS RESTRICTIONS FROM THESE CLOUDS WILL
GENERALLY BE LIMITED TO WHERE THE CLOUDS INTERSECT INLAND HIGHER
TERRAIN. CLOUDS WILL BEGIN TO SCATTER OUT AROUND 15-16Z FOR INLAND
AREAS FIRST, WITH FULL CLEARING TO THE COASTS FOR THE MAJORITY OF
AREAS AROUND 17-18Z. OTHERWISE, SCT-BKN HIGH CLOUDS WILL CONTINUE TO
MOVE SOUTH ACROSS THE REGION TODAY. LOW CLOUDS WILL REDEVELOP LATE
THIS EVENING, MOVING INTO COASTAL REGIONS 09-12Z WED. BASES WILL BE
LOWER, AROUND 600-1000 FT MSL, AND CIG COVERAGE LOOKS TO BE MUCH
PATCHIER THAN TODAY.
MOUNTAINS/DESERTS...SCT-BKN HIGH CLOUDS AND VFR CONDITIONS TODAY AND
TONIGHT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE ANTICIPATED THROUGH SATURDAY.
BEACHES
A LONG-PERIOD SWELL WILL ARRIVE TODAY, GENERATING ELEVATED SURF -
ESPECIALLY FOR WEST FACING BEACHES - WITH SETS TO 6-7 FEET, A HIGH
RIP CURRENT RISK, AND SOME DANGEROUS SWIMMING CONDITIONS. SWELL AND
SURF WILL EASE SOMEWHAT WEDNESDAY.
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...17
AVIATION/MARINE/BEACHES...CSP
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