822
FXUS66 KSTO 282023
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
1223 PM PST WED JAN 28 2026
KEY MESSAGES
- DRY WEATHER WITH PATCHY FOG IN THE VALLEY AND LOWER FOOTHILLS
EXPECTED THROUGH EARLY NEXT WEEK.
- 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 THE WEEKEND. MORNING
FOG POTENTIAL IS ALSO ANTICIPATED IN THE VALLEY AND LOWER
FOOTHILLS DURING THIS TIMEFRAME. FOR TONIGHT INTO THURSDAY
MORNING, HIGH RESOLUTION ENSEMBLE GUIDANCE INDICATES A 55 TO 80
PERCENT CHANCE OF VISIBILITIES LESS THAN 1/2 MILE ACROSS PORTIONS
OF THE CENTRAL/SOUTHERN SACRAMENTO VALLEY AND THE NORTHERN SAN
JOAQUIN VALLEY. A DENSE FOG ADVISORY HAS BEEN ISSUED FOR THE
CENTRAL/SOUTHERN SACRAMENTO VALLEY AND NORTHERN SAN JOAQUIN
VALLEY FROM MIDNIGHT TONIGHT THROUGH NOON PST THURSDAY. 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 OVER THE COAST RANGE AND SHASTA COUNTY MOUNTAINS
SUNDAY INTO EARLY MONDAY MORNING. HOWEVER, LATEST WPC PRECIPITATION
GUIDANCE HAS TRENDED 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.
AVIATION
VFR CONDITIONS EXPECTED THIS AFTERNOON AND EARLY EVENING ACROSS
VALLEY TAF SITES. VALLEY SURFACE WINDS UP TO AROUND 15 KTS THROUGH
AROUND 07Z THURSDAY, THEN FALLING BELOW 12 KTS. CENTRAL/SOUTHERN
SAC VALLEY, DELTA, AND NORTHERN SAN JOAQUIN VALLEY TAF SITES WILL
FALL INTO MVFR/IFR/LIFR AROUND 12Z THURSDAY AS BR/FG DEVELOPS
OVERNIGHT, LINGERING UNTIL AROUND 20Z THURSDAY MORNING.
STO WATCHES/WARNINGS/ADVISORIES
DENSE FOG ADVISORY FROM MIDNIGHT TONIGHT TO NOON PST THURSDAY
FOR CENTRAL SACRAMENTO VALLEY-NORTHERN SAN JOAQUIN VALLEY-
SOUTHERN SACRAMENTO VALLEY.
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