228
FXUS66 KSGX 170917
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
217 AM PDT FRI OCT 17 2025
SYNOPSIS
HIGH PRESSURE OVER CALIFORNIA AND WEAK OFFSHORE FLOW WILL CONTINUE
WARMING AND DRYING THROUGH SATURDAY WITH THE WARMING CONTINUING
INTO SUNDAY FOR THE MOUNTAINS AND DESERTS. THERE WILL BE LOCALLY
GUSTY NORTH WINDS THIS MORNING ALONG AND BELOW THE COASTAL SLOPES
OF THE MOUNTAINS IN ORANGE AND SAN BERNARDINO COUNTIES WITH THE
STRONGEST GUSTS TO AROUND 40 MPH. THERE WILL BE COOLING FOR
MONDAY THROUGH WEDNESDAY AS A LOW PRESSURE SYSTEM TO THE SOUTHWEST
MOVES THROUGH SOUTHERN CALIFORNIA FOR TUESDAY AND WEDNESDAY WITH
CHANCES FOR MEASURABLE RAINFALL LESS THAN 10 PERCENT.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SUNDAY)
A LOW PRESSURE SYSTEM WILL DEVELOP AND CUTOFF FROM THE WESTERLIES
REMAINING CENTERED WELL TO THE WEST OF NORTHERN BAJA INTO MONDAY.
HIGH PRESSURE OVER CALIFORNIA WILL BRING WARMING THROUGH SATURDAY,
CONTINUING INTO SUNDAY FOR THE MOUNTAINS AND DESERTS. THERE WILL
GUSTY NORTH WINDS ALONG AND BELOW THE COASTAL SLOPES OF THE SAN
BERNARDINO COUNTY MOUNTAINS FROM BEFORE SUNRISE INTO EARLY
AFTERNOON AND ALONG AND BELOW THE COASTAL SLOPES OF THE SANTA ANA
MOUNTAINS FROM AROUND SUNRISE THROUGH LATE MORNING WITH THE
STRONGER GUSTS MOSTLY 40 MPH OR LESS. WINDS WILL BE WEAKER FOR THE
WEEKEND.
HIGH TEMPERATURES FOR TODAY WILL WARM AROUND 5 DEGREES WITH
ANOTHER FEW TO AROUND 5 DEGREES OF WARMING FOR SATURDAY. ON
SUNDAY, THE MOUNTAINS AND DESERTS WILL CONTINUE TO WARM A FEW
DEGREES ON SUNDAY WHILE THE COAST INTO THE VALLEYS COOLS SLIGHTLY.
HIGH TEMPERATURES ON SATURDAY WILL BE A FEW TO AROUND 5 DEGREES
ABOVE AVERAGE FOR THE COAST AND VALLEYS WITH THE MOUNTAINS AND
DESERTS A FEW DEGREES BELOW AVERAGE. HIGH TEMPERATURES ON SATURDAY
WILL RANGE FROM THE LOWER TO MID 70S NEAR THE COAST TO THE LOWER
TO 80S FOR THE INLAND EMPIRE WITH THE MID 80S TO AROUND 90 FOR THE
LOWER DESERTS.
LONG TERM (MONDAY THROUGH THURSDAY)
LOW PRESSURE TO THE SOUTHWEST OF THE AREA WILL BEGIN TO MOVE
TOWARD THE NORTHEAST ON MONDAY NIGHT, MOVING INLAND THROUGH
CENTRAL AND SOUTHERN CALIFORNIA FOR LATE TUESDAY INTO WEDNESDAY.
THIS WILL BRING COOLING OF AS MUCH AS 4 TO 8 DEGREES ON TUESDAY
FOR THE VALLEYS WITH ANOTHER FEW TO AROUND 5 DEGREES OF COOLING
ON WEDNESDAY.
WEDNESDAY HIGH TEMPERATURES WILL AS MUCH AS 5 TO 10 DEGREES BELOW
AVERAGE FOR THE MOUNTAINS AND VALLEYS. HIGH TEMPERATURES ON
WEDNESDAY WILL RANGE FROM THE MID TO UPPER 60S NEAR THE COAST TO
THE 70S FOR THE INLAND EMPIRE WITH THE 80S FOR THE LOWER DESERTS.
HIGH TEMPERATURES ON THURSDAY WILL WARM AS MUCH AS 4 TO 8 DEGREES
FOR THE VALLEYS.
MOISTURE WITH THAT LOW PRESSURE SYSTEM IS LIMITED. THE MOST LIKELY
TIME FOR ANY SHOWERS WOULD BE FOR LATE TUESDAY INTO WEDNESDAY.
CHANCES FOR ANY MEASURABLE RAINFALL ARE GREATEST IN THE MOUNTAINS,
BUT STILL LESS THAN 10 PERCENT.
AVIATION
170900Z....CLEAR AND VFR CONDITIONS PREVAIL THROUGH EARLY SATURDAY.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH TUESDAY.
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...MUNYAN
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