732
FXUS66 KSGX 312017
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
117 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...
A BROAD TROUGH IS DRAPED ACROSS THE W PAC AND WEST COAST STATES,
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 OF THE HIGH PRESSURE
CURRENTLY OVER MEXICO WILL 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
312030Z....COASTS/WESTERN VALLEYS...LOW CLOUDS AND FOG WITH BASES
700-1100 FEET MSL, TOPS TO 1500 FEET, AND VIS 0-5SM OVER HIGHER
TERRAIN WILL BEGIN TO DEVELOP AFTER 04Z AND MOVE LOCALLY INLAND
AFTER 06Z. SCATTER OUT FRIDAY 16-17Z.
INLAND VALLEYS/MOUNTAINS/DESERTS
MOSTLY CLEAR WITH VFR CONDITIONS
THROUGH 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...APR
AVIATION/MARINE...MM
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