593
FXUS66 KSTO 292106
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
106 PM PST THU JAN 29 2026
KEY MESSAGES
- DRY WEATHER WITH PATCHY FOG IN THE VALLEY AND LOWER FOOTHILLS
EXPECTED THROUGH SATURDAY.
- PRECIPITATION CHANCES HAVE TRENDED DOWN FOR SUNDAY INTO EARLY
MONDAY MORNING.
DISCUSSION
..TODAY THROUGH SATURDAY
THE UPPER LEVEL PATTERN FEATURES RIDGING, WITH DRY AND MILD
WEATHER PREVAILING ACROSS THE AREA TODAY INTO SATURDAY. MORNING
FOG POTENTIAL IS ALSO ANTICIPATED IN THE VALLEY AND LOWER
FOOTHILLS DURING THIS TIMEFRAME. FOR TONIGHT INTO FRIDAY MORNING,
HIGH RESOLUTION ENSEMBLE GUIDANCE INDICATES A 45 TO 80 PERCENT
CHANCE OF VISIBILITIES LESS THAN 1/2 MILE ACROSS PORTIONS OF THE
DELTA, THE CENTRAL/SOUTHERN SACRAMENTO VALLEY AND THE NORTHERN
SAN JOAQUIN VALLEY. A DENSE FOG ADVISORY HAS BEEN ISSUED FOR THE
DELTA, THE CENTRAL/SOUTHERN SACRAMENTO VALLEY, AND THE NORTHERN
SAN JOAQUIN VALLEY FROM MIDNIGHT TONIGHT THROUGH NOON PST FRIDAY.
BE SURE TO SLOW DOWN AND USE LOW-BEAM HEADLIGHTS IF FOG IS
ENCOUNTERED WHILE DRIVING. A GRADUAL WARMING TREND IS FORECAST
INTO SATURDAY, WITH VALLEY HIGHS REACHING INTO THE LOW TO MID 60S
BY FRIDAY. GENERALLY LIGHT WINDS ARE FORECAST, EXCEPT FOR
PERIODICALLY BREEZY OFFSHORE FLOW.
..SUNDAY THROUGH EARLY MONDAY MORNING
ENSEMBLE GUIDANCE INDICATES THE POTENTIAL FOR A WEAK SYSTEM TO
APPROACH THE AREA BY THE WEEKEND WITH CHANCES FOR VERY LIGHT
PRECIPITATION SUNDAY INTO EARLY MONDAY MORNING, MAINLY OVER THE
COAST RANGE AND SHASTA COUNTY MOUNTAINS. HOWEVER, LATEST GUIDANCE
CONTINUES TO TREND DRIER. MINOR COOLING EXPECTED ON SUNDAY AS
WELL.
..EARLY NEXT WEEK
RIDGING BUILDS BACK IN, WITH DRY AND WARMER WEATHER ANTICIPATED
ACROSS INTERIOR NORCAL ALONG WITH MORNING FOG POTENTIAL. THE
CLIMATE PREDICTION CENTER CONTINUES TO FAVOR DRIER THAN NORMAL
CONDITIONS INTO EARLY FEBRUARY. OTHERWISE, BREEZY OFFSHORE FLOW
IS EXPECTED AT TIMES.
AVIATION
WIDESPREAD VFR CONDITIONS BY THIS AFTERNOON, THEN AROUND 04Z
FRIDAY, BR/FG DEVELOPS ACROSS THE CENTRAL/SOUTHERN SACRAMENTO
VALLEY, NORTHERN SAN JOAQUIN VALLEY, AND PORTIONS OF THE DELTA
BRINGING MVFR/IFR/LIFR CONDITIONS UNTIL AROUND 20Z FRIDAY. LIGHT
SURFACE WINDS BELOW 12 KTS EXPECTED ACROSS THE REGION.
STO WATCHES/WARNINGS/ADVISORIES
DENSE FOG ADVISORY FROM MIDNIGHT TONIGHT TO NOON PST FRIDAY FOR
CARQUINEZ STRAIT AND DELTA-CENTRAL SACRAMENTO VALLEY-NORTHERN
SAN JOAQUIN VALLEY-SOUTHERN SACRAMENTO VALLEY.
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