773
FXUS66 KSGX 210001
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
501 PM PDT SAT JUN 20 2026
SYNOPSIS
BELOW AVERAGE TEMPERATURES WITH MARINE LAYER LOW CLOUDS AND FOG
REACHING INTO PORTIONS OF THE VALLEYS THIS WEEKEND. FOR THE FIRST
HALF OF THE WEEK, WIDESPREAD MODERATE TO AREAS OF MAJOR HEATRISK
POSSIBLE FOR THE DESERTS AND WIDESPREAD MINOR TO LOCALLY MODERATE
HEATRISK FOR INLAND ORANGE COUNTY, VALLEYS, AND MOUNTAINS. THE
MARINE LAYER WILL BECOME SHALLOWER NEXT WEEK, STAYING CONFINED TO
COASTAL LOCATIONS. GRADUAL COOLING EXPECTED FOR THE SECOND HALF OF
THE WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
UPDATED AVIATION AND MARINE DISCUSSION FOR 00Z TAF PACKAGE
AT 11:30 AM, TEMPERATURES WERE RUNNING 3 TO 7 DEGREES WARMER THAN
YESTERDAY IN THE INLAND EMPIRE, SAN BERNARDINO MOUNTAINS, AND INLAND
ORANGE COUNTY WITH TEMPERATURES SIMILAR TO A FEW DEGREES COOLER THAN
11:30 AM YESTERDAY ELSEWHERE. VISIBLE SATELLITE IS SHOWING
PARTIAL CLEARING ALONG THE IMMEDIATE COAST, WITH THE POTENTIAL FOR
WIDESPREAD CLEARING THIS AFTERNOON. LOW CLOUDS ARE EXPECTED TO
REACH INTO PORTIONS OF THE VALLEYS AGAIN OVERNIGHT INTO SUNDAY
MORNING. HIGHS SUNDAY ARE EXPECTED TO REMAIN BELOW AVERAGE BUT
WILL TREND A FEW DEGREES WARMER THAN TODAY.
ADDITIONAL WARMING IS EXPECTED INTO THE MIDDLE OF THE WEEK AS A
RIDGE OF HIGH PRESSURE BUILDS ALOFT FROM THE SOUTH. CURRENT FORECAST
HAS HIGH TEMPERATURES FOR INLAND LOCATIONS 5 TO 10 DEGREES ABOVE
AVERAGE WITH LOCALIZED AREAS OF MODERATE HEATRISK AWAY FROM THE
COAST AND AREAS OF MAJOR HEATRISK IN THE LOW DESERT BY WEDNESDAY.
THE FORECAST HAS TRENDED COOLER BY A FEW DEGREES FOR TUESDAY
THROUGH THURSDAY, WHICH HAS LIMITED THE GEOGRAPHIC EXTENT OF
MODERATE HEATRISK IN THE VALLEYS AND MAJOR HEATRISK IN THE LOW
DESERT. BASED ON THE CURRENT FORECAST, HOTTEST DAY IS EXPECTED TO
BE WEDNESDAY WITH TUESDAY AND THURSDAY A FEW DEGREES COOLER THAN
WEDNESDAY.
GUIDANCE CONTINUES TO INDICATE AN INCREASE IN PRECIPITABLE WATER FOR
THE MIDDLE TO END OF NEXT WEEK. THIS WILL MOST LIKELY RESULT IN
LIMITED DAYTIME HEATING, WARMER THAN NORMAL OVERNIGHT LOW
TEMPERATURES, AND MORE HUMID FEELING CONDITIONS. AS FAR AS THE
MARINE LAYER GOES, THE BUILDING HIGH PRESSURE AND INFLUX OF
MOISTURE WILL RESULT IN A SHALLOWER MARINE LAYER AND LIMITED LOW
CLOUD DEVELOPMENT. WHILE THE MOST LIKELY SCENARIO IS FOR DRY
CONDITIONS TO PREVAIL, THERE IS A 10-15 PERCENT CHANCE SHOWERS OR
THUNDERSTORMS MAY DEVELOP OVER AREA MOUNTAINS WEDNESDAY AFTERNOON.
MOST ENSEMBLE SOLUTIONS ARE NOW ON BOARD WITH A SHORTWAVE TROUGH
MOVING INTO THE PACIFIC NORTHWEST BY THURSDAY. THIS WILL DISPLACE
THE RIDGE ALOFT AND RESULT IN A GRADUAL COOLING. BY NEXT SATURDAY,
CONDITIONS ARE EXPECTED TO BE WITHIN A FEW DEGREES OF NORMAL.
AVIATION
210000Z...COAST/VALLEYS...PATCHY LOW CLOUDS ARE JUST STARTING TO
REDEVELOP OVER COASTAL SAN DIEGO COUNTY, THOUGH COVERAGE SHOULD
REMAIN PATCHY FOR THE NEXT FEW HOURS. THEREAFTER, LOW CLOUDS SPREAD
NORTHWARD AND INLAND OVERNIGHT, REACHING INTO PORTIONS OF THE INLAND
EMPIRE BY 10-12Z. 60% CHANCE FOR CIGS TO REACH KONT AND 30% CHANCE
AT KSBD. BASES MAY HOVER NEAR OR JUST BELOW 2000 FT MSL THIS
EVENING, BUT SHOULD RISE TO 2000-2500 FT MSL SOMETIME EARLY SUNDAY
MORNING. CLOUDS SCATTER TOWARD THE COASTLINE 16-19Z. LOW CLOUDS WITH
LOWER BASES RETURN TO SAN DIEGO COUNTY COASTAL AREAS 01-03Z MON.
MOUNTAINS/DESERTS...VFR CONDITIONS EXPECTED THROUGH THE TAF PERIOD.
WESTERLY WIND GUSTS OF 25-40 KTS WILL CONTINUE THIS EVENING ALONG
DESERT SLOPES AND LOCALLY INTO DESERTS. LOCAL VIS REDUCTIONS 4-6 SM
IN BLDU DURING PERIODS OF STRONG GUSTS AND MODERATE UP/DOWNDRAFTS IN
LEE OF MTNS. WINDS SLOWLY DIMINISH FROM 06-12Z SUN. WESTERLY WINDS
OF SIMILAR STRENGTH RETURN FOR THE SAME AREAS SUNDAY AFTERNOON AND
EVENING.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH THURSDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...BEACH HAZARDS STATEMENT THROUGH SUNDAY EVENING FOR ORANGE COUNTY
COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.
PZ...NONE.
PUBLIC...CO
AVIATION/MARINE...KW
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