067
FXUS66 KSGX 010403
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
903 PM PDT THU JUL 31 2025
SYNOPSIS
QUIET WEATHER WILL CONTINUE WITH TEMPERATURES NEAR AVERAGE AND
NIGHT AND MORNING LOW CLOUDS EACH DAY ALONG THE COAST AND WESTERN
VALLEYS. HIGH PRESSURE OVER THE DESERT SOUTHWEST MAY STRENGTHEN BY
THE MIDDLE OF NEXT WEEK, BRINGING A WARMER TREND WITH TEMPERATURES
NEAR 5 TO 10 DEGREES ABOVE AVERAGE AWAY FROM THE COAST.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THIS EVENING, THE MARINE LAYER IS MARGINALLY DEEPER THAN AT THIS
TIME YESTERDAY, LIKELY DUE TO SOME MINOR HEIGHT FALLS ALOFT. LOW
CLOUDS ARE INCREASING IN COVERAGE IN THE COASTAL AREAS AT THIS
HOUR AND WILL LIKELY SPREAD AS FAR INLAND AS LAST NIGHT, AND
POSSIBLY A LITTLE FARTHER.
FROM PREVIOUS DISCUSSION...
A BROAD TROUGH IS DRAPED ACROSS THE W PAC AND WEST COAST STATES
WITH A PARENT LOW OVER THE GULF OF ALASKA, BRINGING WEAK ONSHORE
FLOW AND TEMPERATURES NEAR AVERAGE. HIGH PRESSURE TO THE SOUTH
WILL TRY TO GAIN STRENGTH OVER THE WEEKEND, BUT THE TROUGHING
PATTERN WILL CONTINUE OVER CALIFORNIA, KEEPING TEMPERATURES
MODERATED WITH MINIMAL DAY TO DAY CHANGES. THE LOWER DESERTS WILL
FEEL THE "GREATEST" WARMING WITH BETTER CHANCES TO CLIMB OVER 110
DEGREES. MARINE LAYER CLOUDS WILL STAY CONFINED TO THE COAST AND
WESTERN VALLEYS EACH NIGHT AND MORNING, WITH AREAS OF FOG ACROSS
HIGHER TERRAIN AND IN VALLEYS, ESPECIALLY THIS WEEKEND.
ENSEMBLE MODELS ARE IN FAIR AGREEMENT WITH RESPECT TO THE HIGH
PRESSURE CURRENTLY OVER MEXICO WHICH WILL LIKELY MOVE OVER THE
DESERT SOUTHWEST BY NEXT WEEK AND STRENGTHEN. THE HIGH MAY EXPAND
FAR ENOUGH WEST TO BRING A WARMING TREND BY WEDNESDAY INTO
THURSDAY OF NEXT WEEK. IF THIS OCCURS, INLAND AREAS COULD SEE
HIGHS 5 TO 10 DEGREES ABOVE AVERAGE. RIGHT NOW, CHANCES ARE AROUND
50% TO SEE HIGHS REACH 115 DEGREES IN THE LOWER DESERTS WITH A
65-80% CHANCE OF SEEING HIGHS REACH 100 DEGREES ACROSS THE INLAND
EMPIRE AND HIGH DESERT. UNCERTAINTY STILL EXISTS IN EXACTLY HOW
MUCH WE WARM UP, BUT DRY WEATHER CERTAINTY REMAINS HIGH FOR THE
UPCOMING WEEK'S FORECAST.
AVIATION
010300Z....COASTS/WESTERN VALLEYS...LOW CLOUDS WITH BASES 700-1100
FEET, TOPS TO 1500 FEET, ARE CURRENTLY BUILDING ALONG PARTS OF THE
COASTLINE, NOT EXPECTING TO START MOVING INLAND UNTIL AROUND 06Z.
CLOUDS WILL SLOWLY PUSH INLAND, DEVELOPING FOG WITH VIS 0-5SM OVER
HIGHER TERRAIN AND LOCALLY IN VALLEYS WEST OF I-15. SCATTER OUT
FRIDAY 16-17Z. OTHERWISE, VFR CONDITIONS FRIDAY WITH LOW CLOUDS
REDEVELOPING AT THE COAST 03Z SAT.
INLAND VALLEYS/MOUNTAINS/DESERTS
MOSTLY CLEAR WITH VFR CONDITIONS
THROUGH LATE FRIDAY.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH MONDAY.
BEACHES
FOR BEACHES AND HARBORS...SMALL WATER LEVEL FLUCTUATIONS WILL
CONTINUE PERIODICALLY FROM THE DIMINISHING TSUNAMI.
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/BEACHES...WESTERINK
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