948
FXUS66 KSGX 171046
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
346 AM PDT WED SEP 17 2025
SYNOPSIS
THE REMNANTS OF TROPICAL STORM MARIO WILL BRING INCREASING
MOISTURE FOR TODAY INTO THURSDAY WITH THE GREATER CHANCES FOR
SHOWERS AND THUNDERSTORMS ON THURSDAY, ESPECIALLY FOR THE
MOUNTAINS AND DESERTS. THERE WILL BE DECREASING CHANCES FOR
SHOWERS AND THUNDERSTORMS ON FRIDAY AND SATURDAY, MAINLY CONFINED
TO THE MOUNTAINS AND DESERTS DURING THE AFTERNOON BY SATURDAY
WITH WARMING AND GRADUAL DRYING FOR THE WEEKEND INTO EARLY NEXT
WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH FRIDAY)
MOISTURE FROM THE REMNANTS OF TROPICAL STORM MARIO WILL SPREAD
NORTHWARD ACROSS THE AREA THROUGH THURSDAY, THEN BEGIN TO DECREASE
ON FRIDAY. THERE WILL BE INCREASING CLOUDS TODAY WITH THE GREATER
CHANCES FOR SHOWERS AND THUNDERSTORMS ON THURSDAY, ESPECIALLY FOR
THE MOUNTAINS AND DESERTS. THE GREATER CHANCE FOR SHOWERS AND
THUNDERSTORMS FOR TODAY IS DURING THE AFTERNOON FOR THE COASTAL
WATERS AND FOR SAN DIEGO COUNTY. CHANCES FOR SHOWERS AND
THUNDERSTORMS WILL DECREASE FOR THURSDAY NIGHT AND FRIDAY.
HIGH TEMPERATURES FOR THE COAST AND VALLEYS WILL COOL 5 TO 10
DEGREES FOR TODAY WITH THE GREATER COOLING ON THURSDAY FOR THE
MOUNTAINS AND DESERTS. HIGH TEMPERATURES ON THURSDAY WILL BE
AROUND 4 TO 8 DEGREES BELOW AVERAGE FOR INLAND AREAS WITH THURSDAY
HIGH TEMPERATURES RANGING FROM AROUND 80 NEAR THE COAST TO THE 80S
FOR THE INLAND EMPIRE WITH THE LOWER TO MID 90S FOR THE LOWER
DESERTS.
LONG TERM (SATURDAY THROUGH TUESDAY)
THERE WILL BE WARMING AND GRADUAL DRYING WITH CHANCES OF
THUNDERSTORMS ON SATURDAY MAINLY DURING THE AFTERNOON FOR THE
MOUNTAINS AND DESERTS. WITH THE WARMING, HIGH TEMPERATURES ON
MONDAY WILL BE GENERALLY A FEW TO AROUND 5 DEGREES ABOVE AVERAGE,
RANGING FROM AROUND 80 NEAR THE COAST TO THE 90S FOR THE INLAND
EMPIRE WITH 100 TO 105 FOR THE LOWER DESERTS.
AVIATION
170930Z...INCREASING AND THICKENING CLOUDS DURING THE DAY AT AROUND
10000 FEET MSL AND ABOVE. SCT -SHRA AND ISO TSRA TO MOVE IN FROM THE
SOUTH AFTER 20Z, AND CONTINUE MOVING NORTHWARD WITH GRADUALLY
INCREASING SHRA/TSRA AFTER 00Z. AT THE SAME TIME, SOME CLOUD BASES
TO LOWER TO AROUND 5000 FEET MSL TONIGHT INTO EARLY THURSDAY,
INTERMITTENTLY OBSCURING SOME OF THE HIGHER TERRAIN.
MARINE
THE REMNANTS OF TROPICAL STORM MARIO WILL BRING A SLIGHT CHANCE
OF THUNDERSTORMS TODAY THROUGH FRIDAY MORNING, WITH A GREATER
CHANCE THURSDAY. ANY STORM COULD BRIEFLY PRODUCE LIGHTNING, GUSTY
VARIABLE WINDS, AND CHOPPY SEAS. OTHERWISE, NO ADDITIONAL
HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SUNDAY.
BEACHES
THERE IS A SLIGHT CHANCE OF LIGHTNING TODAY THROUGH FRIDAY
MORNING, WITH A GREATER CHANCE THURSDAY.
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...MM
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