944
FXUS66 KSGX 140358
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
858 PM PDT WED MAY 13 2026
SYNOPSIS
BRIEF WARMING TREND EXPECTED THROUGH FRIDAY, WITH COOLER
CONDITIONS OVER THE WEEKEND, AND POTENTIAL FOR ADDITIONAL WARMING
EARLY NEXT WEEK. NIGHT AND MORNING LOW CLOUDS AND FOG WILL BE
PRESENT EACH DAY THROUGH THE FORECAST PERIOD ALONG THE COAST AND
INTO PORTIONS OF THE VALLEYS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
VISIBLE SATELLITE AT 11 AM WAS SHOWING LOW CLOUDS CLEARING FROM THE
VALLEYS TO THE COAST. LOW CLOUDS MAY LINGER ALONG THE IMMEDIATE
COAST INTO THE LATE AFTERNOON. THE MARINE LAYER WILL GRADUALLY
BECOME SHALLOWER FOR THURSDAY AND FRIDAY, WITH OVERNIGHT LOW CLOUDS
NOT REACHING AS FAR INLAND. LOW CLOUDS SHOULD CLEAR MOST LOCATIONS
BY LATE MORNING, WITH THE COAST HAVING THE HIGHEST POTENTIAL FOR LOW
CLOUDS LINGERING INTO THE AFTERNOON. THE MARINE LAYER WILL BECOME
DEEPER FOR FRIDAY INTO THE WEEKEND AS A BROAD TROUGH OF LOW PRESSURE
DIGS INTO THE PACIFIC NORTHWEST.
HIGH TEMPERATURES WILL WARM A FEW DEGREES EACH DAY THROUGH FRIDAY,
MOST NOTICEABLE TO FOR THE DESERTS. HIGHS IN THE DESERTS WILL BE 5
TO 10 DEGREES ABOVE AVERAGE, WITH HIGHS WEST OF THE MOUNTAINS WITHIN
5 DEGREES OF AVERAGE. AS THE AFOREMENTIONED LOW DIGS SOUTH, WINDS
WILL INCREASE OVER THE MOUNTAINS AND DESERTS. WINDS WILL PEAK IN
STRENGTH SATURDAY INTO SUNDAY WITH THE TROUGH PASSAGE. ADDITIONALLY
TEMPERATURES WILL FALL A FEW DEGREES, BECOMING SLIGHTLY BELOW NORMAL
FOR MOST LOCATIONS.
TEMPERATURES ARE EXPECTED TO WARM FOR EARLY TO MID-NEXT WEEK. MOST
ENSEMBLE CLUSTERS INDICATE A RIDGE OF HIGH PRESSURE IN THE VICINITY
OF THE US WEST COAST WITH VARIATIONS IN PLACEMENT. A MORE EASTERLY
POSITION (PUTTING THE RIDGE OVER CALIFORNIA) WOULD LEAD TO A WARMER
SOLUTION WITH A MORE WESTERLY POSITION (KEEPING THE RIDGE OVER THE
EASTERN PACIFIC) WOULD KEEP TEMPERATURES MORE MODERATE.
AVIATION
140400Z...COAST/VALLEYS...CLOUDS BASED 1500-2500 FT MSL ARE EXPECTED
TO DEVELOP THROUGH SAN DIEGO COUNTY FROM 05-09Z, EXPANDING NORTHWARD
INTO ORANGE COUNTY THROUGH 13Z AND SLOWLY FILLING INTO THE INLAND
EMPIRE IN PATCHY FASHION. BY 13Z, 35% CHANCE FOR CIGS OVER KONT AND
50% OVER KSBD. PATCHY VIS REDUCTIONS (HZ/BR) 3-5SM IN THE INLAND
EMPIRE; 0-3SM ALONG THE FOOTHILLS. SCATTER OUT INLAND BEGINS 15Z.
FULL SCATTER OUT TO COAST BY AROUND 18Z. CURRENT GUIDANCE SUGGESTS
CLOUDS WILL DEVELOP AGAIN AT THE COAST BETWEEN 01-04Z FRI WITH
INITIALLY SIMILAR BASES.
MOUNTAINS/DESERTS...WESTERLY WIND GUSTS 25-40 KT ALONG DESERT SLOPES
AND INTO DESERTS THIS EVENING, WEAKENING SLIGHTLY THURSDAY MORNING,
THEN RE-STRENGTHENING AFTER 21Z THU. GUSTS LOCALLY TO 50 KTS THROUGH
THE BANNING PASS. MOD UP/DOWNDRAFTS AND LOCAL LLWS IN LEE OF
MOUNTAINS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY
MORNING. INCREASING WINDS AND SEAS OVER THE OUTER COASTAL WATERS
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...CO
AVIATION/MARINE...WESTERINK
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