FXUS66 KSTO 212039
AFDSTO
Area Forecast Discussion
National Weather Service Sacramento CA
139 PM PDT Sat Jun 21 2025
SYNOPSIS...
An active, but predominantly dry weather pattern will keep windy
and cool weather through the weekend, introduce a return to near
normal temperatures and onshore flow, alongside slight mountain
thunderstorm chances into the early week ahead, followed by
potential for above normal temperatures mid to late week.
.KEY MESSAGES...
* Red Flag Warning in effect through 9 AM PDT Sunday for Delta,
Valley, and foothills locations below 3000 feet.
* Today - Sunday:
-Elevated to critical fire weather conditions expected due to the
combination of:
--North to west winds gusting 30 to 40 mph through Sunday
morning, then gradually decreasing into Sunday afternoon, and
--Daytime relative humidity around 15-25% with only modest
overnight recovery.
-Seasonably cool temperatures expected, with Valley high
temperatures in the 80s and 60s to 70s at higher elevations.
-Please continue to practice fire safety such as, properly
extinguishing any campfires, not driving over dry grass,
checking your vehicle for chains or hanging objects that may
cause sparks.
* The Week Ahead:
-Gradual warming trend through midweek with temperatures
returning to seasonal normal values. Valley high temperatures in
the 90s with 70s to 80s expected at higher elevations.
-Slight (10-20%) chance of isolated mountain thunderstorms Monday
PM from Highway 50 southward.
-Primarily dry weather then expected to follow as periodically
breezy onshore flow develops late Monday-Tuesday.
-Some uncertainty in upper level pattern late in the week, but
current ensemble trends indicate further warming with areas of
Moderate HeatRisk potentially returning by Friday.
.Changes from previous forecast...
-Brief periods of elevated fire weather conditions possible into
the early week ahead prior to the transition to onshore flow.
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