785
FXUS66 KMTR 080505
AFDMTR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
905 PM PST SAT MAR 7 2026
..NEW UPDATE, MARINE
KEY MESSAGES
UPDATED AT 1253 PM PST SAT MAR 7 2026
- HIGH TEMPERATURES 10 TO 15 DEGREES ABOVE NORMAL THROUGH SUNDAY
- COOL TOWARDS CLIMATOLOGY FOR MONDAY AND TUESDAY
- SECOND HALF OF NEXT WEEK WILL BRING ANOTHER WARMING TREND
UPDATE
ISSUED AT 847 PM PST SAT MAR 7 2026
THE HIGH CLOUDS THAT BROUGHT THE COLORFUL SUNSET ARE CLEARING.
WHILE THE LACK OF CLOUDS WILL ENHANCE RADIATIONAL COOLING TONIGHT,
TEMPERATURES WILL BE MODERATED BY THE CONTINUED WARMING EFFECT OF
OFFSHORE WINDS. THE SFO-WMC GRADIENT IS CURRENTLY -9.5 MB, A
LITTLE STRONGER THAN EXPECTED, BUT THAT'S PROBABLY ABOUT THE
STRONGEST IT WILL GET. A DISTURBANCE WILL FLATTEN OUT THE RIDGE
AND BRING MORE ZONAL FLOW BY MONDAY. AT THE SURFACE, THE HIGH
PRESSURE CENTERED OVER UTAH WILL GRADUALLY WEAKEN OVER THE NEXT
36-48 HOURS, FROM 1027 MB TO 1016 MB OR SO. THIS WILL ALLOW WINDS
TO SHIFT BACK TO AN ONSHORE DIRECTION, BRINGING COOLER AND MORE
HUMID CONDITIONS MONDAY - TUESDAY. IF YOU'RE ON THE COAST, YOU
WILL PROBABLY FEEL THE EXACT MOMENT WINDS SHIFT BACK TO ONSHORE
TOMORROW AFTERNOON.
SHORT TERM
ISSUED AT 1253 PM PST SAT MAR 7 2026 (THIS AFTERNOON THROUGH
SUNDAY)
THE UPPER RIDGE OF HIGH PRESSURE IS NOSING OVER NORTH BAY TODAY
WHILE AN UPPER LOW IS OFF THE COAST OF NORTHERN BAJA. THIS IS
SETTING UP RAPIDLY WARMING TEMPERATURES ACROSS A BROAD SWATH IN
NORTH BAY AND BEYOND TO THE NORTHEAST. AS THIS RIDGE PUSHES ON THE
TOP OF THE UPPER LOW, WINDS HAVE BEEN GUSTY ACROSS MANY PART OF
THE BAY AREA. AN UPPER TROUGH OVER THE GULF OF ALASKA IS STARTING
TO PRESSURE ON THE RIDGE, FORCING IT FARTHER SOUTH, THUS PUSHING
THE CUTOFF LOW SOUTH TOO. AS EVERYTHING SHIFTS SOUTHWARD OVER THE
NEXT 24 TO 36 HOURS WE'LL SEE THE GUSTY WINDS SHIFT FROM NORTH BAY
THROUGH THE BAY AREA AND EVENTUALLY INTO THE CENTRAL COAST. THIS
TOO WILL CAUSE TEMPERATURES TO FOLLOW THE RIDGE AXIS FARTHER
SOUTHWARD TOO. WHILE SONOMA COUNTY HAS BEEN THE WARM PLACE TODAY,
TOMORROW IT WILL BE INTO SOUTH BAY AND CENTRAL COAST. THE NBM, FOR
TOMORROW, SHOWS LIMITED SPREAD (~2 DEGREES) IN THE ENSEMBLES FOR
NORTH BAY WITH WIDER SPREAD (~3 TO 5 DEGREES) OVER SOUTH BAY AND
CENTRAL COAST. THIS PROVIDES SOME COMFORT THAT MODELS ARE HANDLING
THE SITUATION WELL ENOUGH. STILL, WITH THE FORECAST TODAY THE NBM
5.0 WAS USED FOR TEMPS TOMORROW. THIS IS ABOUT WHAT NBM 4.3 75TH
PERCENTILE IS AT. IN OTHER WORDS, THE FORECAST IS LEANING A LITTLE
WARMER THAN THE OPERATIONAL NBM DETERMINISTIC.
LONG TERM
ISSUED AT 1253 PM PST SAT MAR 7 2026 (SUNDAY NIGHT THROUGH NEXT
FRIDAY)
ONSHORE FLOW RETURNS TO THE SERVICE AREA SUNDAY AND MONDAY. THIS
WILL BRING A BROAD SCALE COOL DOWN FOR MONDAY AND TUESDAY, MORE
TOWARDS CLIMATOLOGICAL NORMALS. THIS A BE A RESULT OF A SYNOPTIC
SCALE PATTERN SHIFT. THE JET STREAM WILL TAKE A DIVE SOUTH INTO
OREGON, JUST CLOSE ENOUGH TO IMPACT OUR GENERAL FLOW. HOWEVER,
THIS WILL BE BRIEF HIT AS THE JET SHIFTS QUICKLY EAST AND ALLOWS
THE NEXT UPPER RIDGE TO BUILD. MODELS ARE PROJECTING THE NEXT WARM
UP TO BEING ON WEDNESDAY, BRINGING US BACK TO ABOUT WHERE WE ARE
THIS WEEKEND. BY FRIDAY THERE IS, ON AVERAGE, A 10 DEGREE SPREAD
IN THE NBM 25TH AND 75TH PERCENTILES, SO THERE ARE STILL SOME
DETAILS TO BE WORKED OUT. THAT SAID, THE FRIDAY 500 MB HEIGHT
ANOMALY CLUSTERS ARE IN PRETTY GOOD AGREEMENT. ON TOP OF THAT, THE
EFI AND SOT ARE 0.90+ FOR SOUTH BAY AND THE CENTRAL COAST FOR
THURS AND FRI. AT THIS POINT, THINGS ARE LOOKING SOLID FOR THE
WARMER SIDE OF THE SOLUTIONS DURING THE SECOND HALF OF THE WEEK.
TEASER...YOU THINK THIS IS WARM? WAIT UNTIL THE WEEK OF THE 15TH.
CPC HAS OUR AREA WITH 70-80% PROBABILITY OF BEING ABOVE NORMAL
BETWEEN MARCH 15-21. AND THE WHISKERS ON SOME OF THE TEMP MODELS
OUT THAT FAR ARE STARTING TO REACH INTO THE 90S FOR SJC. IF YOU
ARE A SUMMER PERSON, IT'S COMING FOR YOU.
AVIATION
(00Z TAFS)
ISSUED AT 356 PM PST SAT MAR 7 2026
VFR CONDITIONS WILL PREVAIL THROUGH THE TAF PERIOD. OFFSHORE
WINDS AND HIGH CLOUDS WILL CONTINUE THROUGH THE EVENING. THE WIND
DIRECTION WILL TREND MORE ONSHORE OVERNIGHT AND THROUGH SUNDAY
MORNING. WITH LOW DEW POINTS AND HIGH CLOUDS, THERE IS LITTLE
CHANCE FOR FOG FORMATION TONIGHT.
VICINITY OF SFO...THE WIND DIRECTION IS HARD TO PIN DOWN HERE, BUT
WILL REMAIN LIGHT TO GENTLE THROUGH THE NIGHT. BY SUNDAY AFTERNOON
THE WINDS WILL BECOME MORE CONSISTENT OUT OF THE TYPICAL WNW
DIRECTION.
SFO BRIDGE APPROACH...SIMILAR TO SFO.
MONTEREY BAY TERMINALS...ONSHORE WINDS WILL DECREASE THROUGH THE
EVENING BEFORE FLIPPING TO GENTLE TO MODERATE DRAINAGE FLOW
OVERNIGHT. THERE IS ABOUT A 10 PERCENT CHANCE FOR LOW CEILINGS TO
DEVELOP AROUND SUNRISE, BUT VFR CONDITIONS ARE MOST LIKELY.
MARINE
(TONIGHT THROUGH NEXT FRIDAY)
ISSUED AT 847 PM PST SAT MAR 7 2026
WINDS WILL INCREASE TO A FRESH TO STRONG NW BREEZE SUNDAY THROUGH
TUESDAY WITH FREQUENT GUSTS TO GALE FORCE ACROSS THE NW WATERS.
IN RESPONSE TO THESE WINDS, VERY ROUGH SEAS OF 12-15 FEET WILL
BUILD ACROSS THE OUTER WATERS MONDAY THROUGH TUESDAY.
MTR WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...SMALL CRAFT ADVISORY FROM 3 PM TO 9 PM PST MONDAY FOR MRY BAY.
SMALL CRAFT ADVISORY FROM 3 PM SUNDAY TO 3 AM PST TUESDAY FOR PT
ARENA TO PT REYES 0-10 NM.
SMALL CRAFT ADVISORY FROM 9 PM SUNDAY TO 3 AM PST TUESDAY FOR PT
REYES TO PIGEON PT 0-10 NM.
SMALL CRAFT ADVISORY FROM 9 AM TO 9 PM PST MONDAY FOR PIGEON PT
TO PT PINOS 0-10 NM-PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM.
SMALL CRAFT ADVISORY UNTIL 3 PM PST SUNDAY FOR PT ARENA TO PT
REYES 10-60 NM.
GALE WARNING FROM 3 PM SUNDAY TO 3 AM PST TUESDAY FOR PT ARENA
TO PT REYES 10-60 NM.
SMALL CRAFT ADVISORY FROM 9 PM SUNDAY TO 3 AM PST MONDAY FOR
PIGEON PT TO PT PINOS 10-60 NM.
GALE WARNING FROM 3 AM TO 9 PM PST MONDAY FOR PIGEON PT TO PT
PINOS 10-60 NM.
SHORT TERM...BFG
LONG TERM....BFG
AVIATION...FLYNN
MARINE...FLYNN
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