593  
FXUS66 KSGX 171544  
AFDSGX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
844 AM PDT FRI OCT 17 2025  
   
SYNOPSIS  
 
DRIER AND WARMER WEATHER WITH WEAK OFFSHORE FLOW AND HIGH  
PRESSURE BUILDING IN, ALLOWING TEMPERATURES TO RISE TO NEAR NORMAL  
INTO THE WEEKEND. SLIGHTLY COOLER FOR EARLY NEXT WEEK AS AN UPPER  
LEVEL LOW MOVES INLAND, DECREASING HEIGHTS. THE LOW WILL BRING  
FURTHER COOLING FOR THE END OF THE NEXT WEEK AND A LOW CHANCE OF  
SHOWERS, WITH CHANCES FOR MEASURABLE RAINFALL CURRENTLY LESS THAN  
10%.  
 
 
   
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE  
 
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO  
COUNTIES...  
   
UPDATE  
 
SKIES REMAIN CLEAR TODAY WITH A FEW STRONGER GUSTS EXCEEDING 30  
MPH IN THE MOUNTAINS AND THROUGH MOUNTAIN PASSES THIS MORNING. THE  
MARINE LAYER WILL REMAIN ABSENT INTO SATURDAY, WITH MORE  
PATCHINESS EXPECTED INTO SUNDAY AS HEIGHTS BEGIN TO SLOWLY  
DECREASE. NO SIGNIFICANT CHANGES FROM THE PREVIOUS FORECAST  
PACKAGE AS THE END OF NEXT WEEK CONTINUES TO TREND DRIER WITH EACH  
MODEL RUN.  
 
 
   
PREVIOUS DISCUSSION FROM 217 AM PDT  
   
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  
 
171520Z....CLEAR AND VFR CONDITIONS THROUGH EARLY SATURDAY.  
 
 
   
MARINE  
 
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH TUESDAY.  
 
 
   
SGX WATCHES/WARNINGS/ADVISORIES  
 
CA...NONE.  
PZ...NONE.  
 
 
 
 
 
PUBLIC...ZUBER  
AVIATION/MARINE...SMALL  
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