738
FXUS66 KSTO 011941
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
1141 AM PST MON DEC 1 2025
KEY MESSAGES
- PERIODS OF CLOUDS, MIST, OR FOG CONTINUE IN THE CENTRAL VALLEY
FOR THE NEXT FEW MORNINGS.
- BREEZY NORTH TO EAST WINDS WEDNESDAY INTO THURSDAY, STRONGEST
IN THE VALLEY AND DELTA.
- WEAK SYSTEM BRUSHES BY THE AREA THIS WEEKEND, BRINGING THE
CHANCE FOR SHOWERS, MAINLY ACROSS SHASTA COUNTY. DRY WEATHER
CONTINUES ELSEWHERE FOR THE FORESEEABLE FUTURE.
DISCUSSION
..TONIGHT - TUESDAY
MORNING FOG AND STRATUS HAVE BEGIN TO BREAK UP EARLY THIS
AFTERNOON (FINALLY!), MORE SO THAN WE'VE SEEN THE PAST FEW DAYS.
LATEST HI-RES GUIDANCE ATTEMPTS TO CLEAR OUT THE ENTIRE SAC AND
NORTHERN SAN JOAQUIN VALLEYS BY THIS EVENING BEFORE SUNSET. THE
SET-UP FOR TONIGHT WILL BE A BATTLE BETWEEN HOW MUCH WE CLEAR OUT
OVER THE NEXT SEVERAL HOURS AND AN INCOMING CLOUD SHIELD FROM
INSIDE-SLIDER SYSTEM OVER THE THE GREAT BASIN THAT WILL DROP SOUTH
ACROSS THE AREA TONIGHT. THERE MAY BE ENOUGH CLEARING ACROSS THE
SOUTHERN SAC VALLEY AND NORTHERN SAN JOAQUIN BEFORE THE CLOUDS
ARRIVE TO ALLOW FOR THE DEVELOPMENT OF FOG AGAIN BY TUESDAY
MORNING. CERTAINLY WILL BE SOMETHING TO WATCH IN THE NEAR-TERM.
..WEDNESDAY - FRIDAY
AFOREMENTIONED INSIDE-SLIDER WILL SKIRT SOUTHEAST OF THE STATE ON
WEDNESDAY AND INTO THE FOUR CORNERS REGION BY WEDNESDAY NIGHT
INTO THURSDAY. TIGHTENED GRADIENT WILL ALLOW FOR BREEZY NORTH TO
NORTHEAST WINDS ACROSS THE AREA DURING THE PERIOD. WINDS WILL BE
STRONGEST IN THE TYPICAL SPOTS WITH A NORTHERLY PATTERN: ACROSS
THE WESTERN SIDE OF THE SAC VALLEY AND INTO THE DELTA (GUSTS 20-35
MPH), AND OVER THE SIERRA CREST (UP TO 45 MPH). NOT EXPECTING TOO
MUCH IN THE WAY OF IMPACTS WITH THE WIND BUT IT SHOULD BE ENOUGH
TO SCOUR OUT PERSISTENT VALLEY STRATUS AND FOG. RIDGING THEN
REBUILDS OVER THE AREA FOR THE END OF THE WORK WEEK WITH NEAR-
NORMAL TEMPERATURES.
..SATURDAY - SUNDAY
A WEAK SHORTWAVE WILL MOVE ACROSS THE PACIFIC NORTHWEST THIS
WEEKEND LEADING TO MORE ZONAL FLOW ACROSS THE AREA. ALSO BRINGS
ABOUT THE POTENTIAL FOR LIGHT SHOWERS, MAINLY ACROSS SHASTA COUNTY
AND NORTHERN SIERRA BUT ENSEMBLES AREN'T TOO EXCITED ABOUT MUCH IN
THE WAY OF ACCUMULATION OR ANY IMPACTS. ELSEWHERE DRY WEATHER WILL
CONTINUE. THE NEXT HINT AT A POTENTIAL PATTERN CHANGE COMES BY THE
FOLLOWING WEEKEND BUT WE'LL SEE HOW THAT DEVELOPS OVER THE NEXT
WEEK OR SO.
AVIATION
GRADUALLY IMPROVING CEILINGS ACROSS THE CENTRAL VALLEY THIS
AFTERNOON AND EVENING, SHOULD IMPROVE BACK TO VFR. DEPENDING ON
DEGREE OF CLEARING, WILL LIKELY SEE ANOTHER ROUND OF BF/FG AND LOW
STRATUS FOR MOST SITES RETURNING TONIGHT AFTER 08-12Z. POTENTIAL
FOR PERIOD OF IFR/LIFR CIGS, ESPECIALLY FROM SACRAMENTO SOUTHWARD.
GENERALLY LIGHT AND VARIABLE SURFACE WINDS LESS THAN 10 KTS FOR
TAF SITES THRU TUESDAY AFTERNOON.
STO WATCHES/WARNINGS/ADVISORIES
NONE.
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