515
FXUS66 KSGX 020409
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
909 PM PDT FRI AUG 1 2025
SYNOPSIS
TEMPERATURES NEAR AVERAGE AND MARINE LAYER LOW CLOUDS EACH NIGHT
AND MORNING ALONG THE COAST AND IN THE WESTERN VALLEYS THROUGH
TUESDAY. HIGH PRESSURE OVER THE DESERT SOUTHWEST WILL LIKELY
STRENGTHEN BY THE LATE NEXT WEEK, BRINGING A WARMING TREND WITH
TEMPERATURES 5 TO 10 DEGREES ABOVE AVERAGE AWAY FROM THE COAST.
THERE IS THE POTENTIAL FOR MONSOON MOISTURE TO RETURN LATE IN THE
WEEK BUT PRECIPITATION CHANCES REMAIN BELOW 10 PERCENT.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THIS EVENING, THE MARINE LAYER IS ABOUT AS DEEP AS IT WAS AT THIS
TIME YESTERDAY BUT THE LOW CLOUDS SEEM SLOWER TO INCREASE IN
COVERAGE AND ADVANCE INLAND. THIS MAY BE DUE TO A WEAKER INVERSION
AS A RESULT OF SOME COOLING JUST ABOVE THE INVERSION.
FROM PREVIOUS DISCUSSION...
OUR WEATHER CONTINUES TO BE CONTROLLED BY THE DOMINANT UPPER
RIDGE CURRENTLY POSITIONED OVER SOUTHERN ARIZONA AND THE
LOW/TROUGH CENTERED OVER THE GULF OF ALASKA. AS A RESULT, THE
MARINE LAYER MIXED OUT EFFICIENTLY TODAY WITH SUNNY SKIES
EXTENDING SEVERAL MILES OUT TO SEA THIS AFTERNOON. HIGH
TEMPERATURES TODAY COMING IN RIGHT AROUND CLIMATOLOGICAL NORMALS
TO 5 DEGREES BELOW NORMAL - TOPPING OUT IN THE 80S TO LOW 90S FOR
MOST WITH 100-110 DEGREES FOR THE DESERTS. AS WE HEAD THROUGH THE
WEEKEND AND INTO NEXT WEEK, THIS RIDGE DOESN'T BUDGE MUCH AND
STAYS RELATIVELY WEAK. STILL, TEMPERATURES INCREASE VERY GRADUALLY
THROUGH TUESDAY, WITH HIGH TEMPERATURES BY TUESDAY AFTERNOON ONLY
A COUPLE OF DEGREES WARMER THAN TODAY. THE MARINE LAYER WILL
CONTINUE TO SPREAD INLAND EACH NIGHT AND RETREAT BACK TO SEA EACH
DAY WITH DEPTH VARYING BETWEEN 700 AND 1400FT.
BY THE MIDDLE PART OF NEXT WEEK, THE CENTER OF THE RIDGE SLIDES A
BIT CLOSER TO NEW MEXICO, BUT ALSO BROADENS AND STRENGTHENS
CONSIDERABLY, BRINGING MORE SUBSTANTIAL WARMING FOR WEDNESDAY AND
THURSDAY. THURSDAY AND FRIDAY WILL LIKELY BE THE HOTTEST DAYS OF
THE NEXT WEEK, WITH WIDESPREAD MODERATE HEATRISK STRETCHING
TOWARDS THE COASTS AND HIGH HEATRISK SPREADING OUT OF THE DESERTS
LOCALLY TO INLAND VALLEYS. HIGH TEMPERATURES REACHING OR
EXCEEDING 100 DEGREES FOR INLAND VALLEYS THURS/FRI WITH THE
DESERTS LIKELY EXCEEDING 115 DEGREES (~90% CHANCE). AVAILABLE
MOISTURE WILL LIKELY BE QUITE BELOW NORMAL FOR EARLY AUGUST MOST
OF NEXT WEEK, BUT RECOVER TO CLOSER TO NORMAL BY THE END OF THE
WEEK. STILL, CHANCES FOR ANY MONSOONAL THUNDERSTORMS BY THE END OF
NEXT WEEK STAY LOW, ABOUT 10 PERCENT OR LESS.
AVIATION
020300Z....COASTS/WESTERN VALLEYS...LOW CLOUDS BASED 700-1200 FEET
MSL ARE SLOWLY MOVING INLAND, REACHING ITS FULL INLAND EXTENT BY
07Z. VIS REDUCED 0-5SM OVER HIGHER COASTAL TERRAIN AND WESTERN
VALLEYS. SCATTER OUT SATURDAY 15-17Z. VFR CONDITIONS SATURDAY
AFTERNOON. LOW CLOUDS REDEVELOP AT THE COAST AROUND 04Z SUN.
INLAND VALLEYS/MOUNTAINS/DESERTS
MOSTLY CLEAR WITH VFR CONDITIONS
THROUGH LATE SATURDAY.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH WEDNESDAY.
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...PG
AVIATION/MARINE...WESTERINK
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