773
FXUS66 KMTR 271751
AFDMTR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1051 AM PDT FRI JUN 27 2025
..NEW AVIATION, MARINE
SYNOPSIS
ISSUED AT 300 AM PDT FRI JUN 27 2025
THE JUNE GLOOM PATTERN CONTINUES WITH CLOUDY COASTAL CONDITIONS,
SOME SUN FOR THE AFTERNOON, AND RETURNING CLOUD COVER INTO THE
EVENING. EXPECT A SLIGHT WARM UP FOR THE INTERIOR TODAY, BUT A
SLOW COOLING TREND FOR THE WEEKEND ITSELF.
SHORT TERM
(TODAY AND TONIGHT)
ISSUED AT 300 AM PDT FRI JUN 27 2025
A VERY SIMILAR DAY TO THE PREVIOUS ONE IS AHEAD OF US WITH LOW
COASTAL CLOUDS LINGERING THOUGH THE LATE MORNING, SOME BREEZINESS IN
THE AFTERNOON (ESPECIALLY ALONG THE COAST) FOLLOWED BY COASTAL CLOUD
COVER RECOVERIES INTO THE EVENING. IT'S THE TYPICAL JUNE GLOOM
PATTERN WITH SOME LIGHTLY WARMER CONDITIONS FOR THE INTERIOR THAN
PREVIOUS DAYS.
THE OVERNIGHT FORECAST PACKAGE DIDN'T NEED TO PUT TOO MANY
ADJUSTMENTS INTO THE OVERALL FORECAST, JUST SOME FINE ADJUSTMENTS TO
THE REGIONAL WINDS, MARINE LAYER LEVELS, AND FOG POTENTIAL. BUT FOR
THE MOST PART, THE FORECAST REMAINS AS ADVERTISED. EXPECT THE
TEMPERATURES TO PEAK IN THE UPPER 50S AND LOW 60S ALONG THE COAST,
INTO THE 70S SLIGHTLY MORE INLAND, AND THE 80S TO LOW 90S FOR THE
MORE INLAND AREAS THAT STAY CLOUD-FREE TODAY. TEMPERATURES WILL BE
SLIGHTLY SLOWER TO COOL THIS EVENING ACROSS THE REGION THIS EVENING,
AND OVERALL LOW TEMPS WILL BE SLIGHTLY WARMER FOR FRIDAY NIGHT
INTO SATURDAY.
LONG TERM
(SATURDAY THROUGH THURSDAY)
ISSUED AT 300 AM PDT FRI JUN 27 2025
THE UPPER-LEVEL PATTERN LOOKS INTERESTING.. FOR AREAS TO THE NORTH,
WHILE OUR PATTERN SITS MOSTLY IN THE IN-BETWEEN. A LOOP OF LOW
PRESSURES AFFECT THE THE PACIFIC NORTH WEST OVER THE NEXT FEW DAYS
LEADING TO SOME GOOD AND VERY PERSISTENT RAIN CHANCES.. FOR JUST
THEM. NORTHERN CALIFORNIA WILL MOSTLY STICK TO ZONAL FLOW, TO THE
POINT THAT ANY RAIN THAT PUSHES SOUTH OF OREGON GETS DIRECTED INLAND
AND AWAY FROM THE BAY AREA.
THERE WILL BE A WEAK TROUGH FORMATION OVER THE BAY AREA AND CENTRAL
COAST INTO THE WEEKEND, CAUSING A SLIGHT DEEPENING AND INLAND
EXPANSION OF THE OF THE MARINE LAYER. THIS TROUGH WILL BE VERY SLOW
TO EXIT, BUT LONGER TERM MODELS HINT AT A RETURN TO MOSTLY ZONAL
FLOW AGAIN IN THE MID WEEK, WITH ANOTHER WEAK TROUGH FORMING RIGHT
AFTER.
WHAT DOES THAT ALL MEAN FOR THE FORECAST? NOT A WHOLE LOT.
TEMPERATURES ALONG THE COAST AND THE SLIGHTLY INLAND AREAS WON'T SEE
MUCH IN THE WAY OF VARIATION. AREAS THAT ARE MORE INLAND WILL SEE
SOME COOLER CONDITIONS AS ONSHORE FLOW CONTINUES AND THE MARINE LAYER
REACHES FARTHER INLAND. THE PATTERN OF CLOUDY MORNINGS, CLEARING
AFTERNOONS, THEN CLOUDY EVENINGS FOR THE COAST AND NEAR-COASTAL
AREAS WILL PERSIST THROUGH THE MID AND LONG TERM FORECAST. THE
SWITCH FROM THE TROUGH TO ZONAL FLOW COULD LEAD TO INCREASED
COASTAL FOG CHANCES, BUT MOSTLY ALONG THE IMMEDIATE COAST.
SO WE'RE FAR FROM DYNAMIC WEATHER, BUT THIS PATTERN DOES KEEP THE
REGION AWAY FROM ANY NOTABLE FIRE WEATHER CONCERNS, WITH EVEN SOME
IMPROVEMENTS TO THE INTERIOR HUMIDITIES.
AVIATION
(18Z TAFS)
ISSUED AT 1051 AM PDT FRI JUN 27 2025
SKY CONDITIONS HAVE EITHER SCATTERED OUT OR COMPLETELY CLEARED AS OF
THIS WRITING. ONSHORE WINDS WILL INCREASE THIS AFTERNOON, YET ARE
FORECAST TO BE SLIGHTLY WEAKER THAN PREVIOUS DAYS. WINDS EASE AFTER
SUNSET AND RETURN TO LIGHT/VARIABLE AT MOST SITES. RATHER HIGH
CONFIDENCE FOR IFR/MVFR CONDITIONS TO RETURN TO THE MONTEREY BAY
TERMINALS LATE EVENING OR EARLY SATURDAY MORNING WITH MUCH LOWER
PROBABILITIES FOR THE BAY AREA TERMINALS.
VICINITY OF SFO...VFR CONDITIONS ARE EXPECTED TO PERSIST THROUGH THE
FORECAST PERIOD. ONSHORE WINDS INCREASE THIS AFTERNOON WITH GUSTS UP
TO 20 KT. LOW CONFIDENCE FOR IFR/MVFR CEILINGS EARLY SATURDAY
MORNING AND HAVE NOT INCLUDED IN THE TAFS AT THIS TIME. ANY LOW
CLOUDS THAT DO DEVELOP WILL SCATTER OUT OR CLEAR BY 16Z-18Z SATURDAY
WITH INCREASING ONSHORE WINDS AGAIN BY SATURDAY AFTERNOON.
SFO BRIDGE APPROACH....SIMILAR TO SFO.
MONTEREY BAY TERMINALS...VFR CONDITIONS ARE EXPECTED TO PERSIST
THROUGH EARLY THIS EVENING. ONSHORE WINDS INCREASE THIS AFTERNOON
BEFORE EASING LATE THIS EVENING. HIGH CONFIDENCE FOR IFR/MVFR
CEILINGS TO RETURN LATE THIS EVENING AND POTENTIALLY LOWERING AT
TIMES TO LIFR EARLY SATURDAY MORNING.
MARINE
(TODAY THROUGH WEDNESDAY)
ISSUED AT 1051 AM PDT FRI JUN 27 2025
NORTHWESTERLY FRESH TO STRONG BREEZES WILL CONTINUE OVER THE
OUTER WATERS NORTH OF POINT REYES THROUGH SUNDAY. MODERATE TO
ROUGH SEAS CONTINUE THROUGH THE DAY, WITH SIGNIFICANT WAVE
HEIGHTS SUBSIDING SATURDAY INTO SUNDAY AS WINDS EASE. THE NEXT
ROUND OF ELEVATED WAVE HEIGHTS, STRONG NORTHWESTERLY BREEZES, AND
MODERATE TO ROUGH SEAS BEGINS TUESDAY AND CONTINUES THROUGH LATE
NEXT WEEK.
MTR WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...SMALL CRAFT ADVISORY UNTIL 3 PM PDT SATURDAY FOR PIGEON PT TO PT
PINOS 10-60 NM-PT ARENA TO PT REYES 0-10 NM-PT ARENA TO PT
REYES 10-60 NM.
SHORT TERM...MURDOCK
LONG TERM....MURDOCK
AVIATION...RGASS
MARINE...RGASS
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