598
FXUS66 KSGX 131054
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
354 AM PDT WED MAY 13 2026
SYNOPSIS
THE MOUNTAINS AND DESERTS WILL CONTINUE TO COOL TODAY WHILE THE
VALLEYS BEGIN TO WARM. SLIGHT WARMING FOR THURSDAY AND FRIDAY
FOLLOWED BY GREATER INLAND COOLING FOR THE WEEKEND. THEN WARMER
EARLY NEXT WEEK WITH HIGH TEMPERATURES FOR TUESDAY OF NEXT WEEK 5
TO 10 DEGREES ABOVE AVERAGE FOR INLAND AREAS. LOW CLOUDS WILL
COVER MUCH OF THE COASTAL WATERS AND THE COAST AND VALLEYS THIS
MORNING, THEN NOT SPREAD AS FAR INTO THE VALLEYS FOR THURSDAY AND
FRIDAY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (WEDNESDAY THROUGH FRIDAY)
THE MARINE LAYER HAS DEEPENED TO AROUND 3000 FEET WITH WIDESPREAD
LOW CLOUDS OVER THE COASTAL WATER EXTENDING INLAND ACROSS MOST OF
THE COAST AND VALLEYS. CLOUD BASES NEAR THE COAST HAVE INCREASED
ENOUGH THAT THE MORE LIKELY LOCATION FOR ANY PATCHY DRIZZLE THIS
MORNING SHOULD BE IN PORTIONS OF THE VALLEYS. THE MARINE LAYER IS
EXPECTED TO BECOME GRADUALLY SHALLOWER FOR THURSDAY AND FRIDAY
WITH LOW CLOUDS SPREADING INTO PORTIONS OF THE INLAND VALLEYS FOR
EARLY THURSDAY AND INTO THE WESTERN VALLEYS FOR EARLY FRIDAY.
HIGH TEMPERATURES FOR THE MOUNTAINS AND DESERTS WILL COOL TODAY
WHILE THE VALLEYS MAY BEGIN TO WARM. THIS WILL BE FOLLOWED BY
INLAND WARMING FOR THURSDAY AND FRIDAY. HIGH TEMPERATURES ON
FRIDAY WILL RANGE FROM AROUND AVERAGE NEAR THE COAST TO 5 TO 10
DEGREES AVERAGE FOR THE DESERTS. HIGH TEMPERATURES ON FRIDAY WILL
RANGE FROM THE MID TO UPPER 60S NEAR THE COAST TO THE UPPER 70S
TO UPPER 80S FOR INLAND EMPIRE WITH THE UPPER 90S TO 104 FOR THE
LOWER DESERTS.
LONG TERM (SATURDAY THROUGH TUESDAY)
STRONGER ONSHORE FLOW FOR THE WEEKEND WILL SPREAD COOLING INLAND.
THE GREATER COOLING IS EXPECTED ON SUNDAY WITH HIGH TEMPERATURES
AROUND 5 DEGREES COOLER FOR THE DESERTS, MOUNTAINS, AND INLAND
VALLEYS. THERE WILL BE WARMING FOR EARLY NEXT WEEK WITH HIGH
TEMPERATURES FOR INLAND AREAS AROUND 5 TO 10 DEGREES ABOVE
AVERAGE ON TUESDAY, AROUND 100 FOR THE LOWER DESERTS.
AVIATION
130930Z...COAST/VALLEYS...LOW CLOUDS WITH BASES 1600-3000 FEET
AND TOPS TO 4000 FEET MSL WILL CONTINUE TO FILL THE COASTAL BASIN
THIS MORNING. VIS REDUCED IN HILLS AND IN COASTAL -DZ THROUGH 17Z.
SCATTER OUT 16-19Z, BUT INCOMPLETE OR INTERMITTENT CLEARING ALONG
THE COAST. LOW CLOUDS TO PUSH ASHORE AND INLAND AFTER 01Z VCNTY
KSAN AND AFTER 07Z VCNTY KSNA. THEY SHOULD FILL THE COASTAL BASIN
AGAIN BY EARLY THURSDAY WITH BASES 1000-1800 FEET MSL.
MOUNTAINS/DESERTS...CLEARING SKIES THIS MORNING, BUT SCT CLOUDS
AROUND 10000 FEET MSL OVER MOUNTAINS 18-00Z. WESTERLY WIND GUSTS 25-
40 KT AFTER 20Z, STRONGEST THROUGH MOUNTAIN GAPS. THESE COULD LEAD
TO MOD UP/DOWNDRAFTS AND LOCAL LLWS IN LEE OF MOUNTAINS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY
MORNING. INCREASING WINDS AND SEAS COULD BECOME HAZARDOUS FOR
SMALL CRAFT SATURDAY AFTERNOON THROUGH SUNDAY.
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...MM
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