198
FXUS66 KMTR 221936
AFDMTR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1236 PM PDT WED JUL 22 2026
..NEW SHORT TERM, LONG TERM
KEY MESSAGES
UPDATED AT 1234 PM PDT WED JUL 22 2026
- BREEZY ONSHORE WINDS RETURN LATE THIS WEEK AND INTO THE
WEEKEND
- TEMPERATURES NEAR SEASONAL AVERAGES THROUGHOUT EARLY NEXT WEEK
SHORT TERM
ISSUED AT 1234 PM PDT WED JUL 22 2026
(THIS EVENING THROUGH THURSDAY NIGHT)
THE MARINE LAYER REDEVELOPED OVERNIGHT TO AROUND 1,800 FEET IN
DEPTH AND RESULTED IN INLAND EXPANSION OF COASTAL STRATUS.
SOUTHWEST WINDS ALSO RESULTED IN FAVORED LOCATIONS IN THE SANTA
CRUZ MOUNTAINS AND MARIN COASTAL RANGE (MOUNT TAMALPAIS) TO SEE
DRIZZLE AND LIGHT RAIN AT TIMES WITH UP TO 0.16" OF PRECIPITATION.
WITH SOUTHWESTERLY WINDS FORECAST TO PERSIST THROUGH EARLY THIS
AFTERNOON, PLACES SUCH AS THE NORTH BAY AND MONTEREY BAY REGION
MAY ONLY SEE STRATUS SCATTER OUT FOR A FEW HOURS THIS AFTERNOON.
AS DEWPOINT TEMPERATURES REMAIN IN THE UPPER 50S TO LOWER 60S, IT
WILL REMAIN MUGGY FEELING THROUGHOUT MUCH OF THE DAY WITH HIGHER
HUMIDITY REGIONWIDE. TEMPERATURES REGIONWIDE HAVE FALLEN TO
SLIGHTLY BELOW AVERAGE WHILE THE NORTH BAY REGION IS EXPECTED TO
BE AS MUCH AS 15 DEGREES BELOW AVERAGE.
AS WINDS SHIFT MORE OUT OF THE NORTHWEST LATE THIS EVENING AND
INTO THE OVERNIGHT ACROSS THE COASTAL WATERS, EXPECTING INLAND
EXPANSION OF THE STRATUS ONCE AGAIN WITH A RETURN TO A MORE
TYPICAL SUMMERTIME PATTERN. THERE IS AGAIN THE POTENTIAL FOR
MIST/DRIZZLE AGAIN TONIGHT, YET WILL BE LESS WIDESPREAD. LOW
CLOUDS THAT DO DEVELOP INLAND ARE FORECAST TO RETREAT TO THE COAST
BY MID-TO-LATE MORNING AND ESPECIALLY SO BY THURSDAY AFTERNOON.
MAXIMUM AFTERNOON TEMPERATURES ON THURSDAY ARE FORECAST TO RANGE
IN THE UPPER 50S TO LOWER 70S NEAR THE COAST, IN THE 70S BAYSIDE,
AND 80S TO LOWER 90S IN THE INTERIOR. THE SOUTHERN PORTION OF THE
CENTRAL COAST HAS THE GREATEST POTENTIAL TO EXCEED 100 DEG F IN
PLACES SUCH AS LOCKWOOD, BRADLEY AND PARKFIELD.
LONG TERM
ISSUED AT 1234 PM PDT WED JUL 22 2026
(FRIDAY THROUGH NEXT TUESDAY)
THE RIDGE CURRENTLY OVER THE SOUTHERN PLAINS IS FORECAST TO SHIFT
WESTWARD TOWARDS THE FOUR CORNERS REGION OVER THE WEEKEND. THIS WILL
WORK TO COMPRESS OUR MARINE LAYER AND ALLOW FOR A SLIGHT WARMING
TREND ACROSS THE INTERIOR. HOWEVER, TEMPERATURES WILL REMAIN WITHIN
A FEW DEGREES OF SEASONAL AVERAGES INTO EARLY NEXT WEEK. AS SUCH,
EXPECTING TYPICAL EBB AND FLOW OF STRATUS RETURNING INTO THE VALLEYS
OVERNIGHT AND RETREATING TO THE COAST BY MID-TO-LATE MORNING.
AVIATION
(18Z TAFS)
ISSUED AT 1039 AM PDT WED JUL 22 2026
AN ONSHORE GRADIENT AND 1800 FT DEEP MARINE LAYER HAVE KEPT CIGS
IN PLACE OVER COASTAL TERMINALS. LATEST SATELLITE IMAGERY DEPICTS
A RAPIDLY ERODING CLOUD DECK OVER INLAND AREA WHILE COASTAL
STRATUS PERSISTS. WINDS REMAIN OUT OF THE SOUTH TO SOUTHWEST AND
WILL GRADUALLY VEER BACK TO WEST AND NW THROUGH THE DAY AS THE
CLOUDS RETREAT BACK TO THE COAST. ANTICIPATE AN EARLY RETURN TO OF
THE MARINE LAYER THIS EVENING.
VICINITY OF SFO...MODERATE AND OCCASIONALLY GUSTY SOUTHERLY WINDS
WILL PREVAIL THROUGH THE MORNING HOURS AS MARINE LAYER HOVERS NEAR
THE TERMINAL. SOUTHERLY WIND HAVE HELP KEEP THE SKIES MOSTLY MVFR
TO IFR. CIGS ARE EXPECTED TO MAKE AN EARLY RETURN AS WINDS VEER TO
THE NORTHWEST THIS AFTERNOON.
SFO BRIDGE APPROACH...SIMILAR TO SFO.
MONTEREY BAY TERMINALS...MVFR CIGS ARE EXPECTED TO PERSIST THROUGH
THE REMAINDER OF THE MORNING THEN TEMPORARILY SCATTER OUT IN THE
EARLY AFTERNOON BEFORE RETURNING AROUND SUNSET THIS EVENING.
MARINE
(TODAY THROUGH MONDAY)
ISSUED AT 1039 AM PDT WED JUL 22 2026
A MODERATE SOUTHERLY WIND WILL GRADUALLY SHIFT TO NW THROUGH
WEDNESDAY AFTERNOON. WINDS WILL INCREASE TO A FRESH NW BREEZE
THURSDAY-FRIDAY, WITH SIMILAR CONDITIONS CONTINUING INTO NEXT
WEEK. SIGNIFICANT WAVE HEIGHTS WILL REMAIN MODERATE THIS WEEK
BEFORE LONG PERIOD SOUTHERLY SWELL FROM HURRICANE FAUSTO REACHES
THE COASTAL WATERS THIS WEEKEND.
MTR WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...SMALL CRAFT ADVISORY FROM 9 AM TO 9 PM PDT THURSDAY FOR MRY BAY.
SMALL CRAFT ADVISORY FROM 3 PM THURSDAY TO 3 AM PDT FRIDAY FOR
PIGEON PT TO PT PINOS 10-60 NM-PT ARENA TO PT REYES 0-10 NM.
SMALL CRAFT ADVISORY FROM 9 AM THURSDAY TO 3 AM PDT FRIDAY FOR
PIGEON PT TO PT PINOS 0-10 NM.
SMALL CRAFT ADVISORY FROM 9 PM THIS EVENING TO 3 AM PDT FRIDAY
FOR PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM.
SHORT TERM...RGASS
LONG TERM....RGASS
AVIATION...CW
MARINE...CW
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