Grass Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

376
FXUS66 KSTO 042130
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
230 PM PDT Fri Jul 4 2025


.DISCUSSION...

.SYNOPSIS...
Dry and breezy with below normal temperatures for the rest of today.
There is a small (~10%) chance for the far northern Shasta County
mountain thunderstorms this afternoon. Onshore flow will continue
to bring cooler, below normal temperatures with locally breezy
winds for Saturday, with dry weather. A slow warming trend
continues over the weekend into Monday with near normal
temperatures.

&&

.KEY MESSAGES...

* Friday(Independence Day)- Friday night
 - Mainly dry, mostly clear with breezy onshore winds and below
   normal temperatures
 - Slight (10%) probability of showers and thunderstorms through
   early evening across the mountains of northern Shasta County

*  Weekend - Monday:
 - Quiet, dry weather
 - Onshore winds will keep temperatures below average Saturday
 - Winds will be locally breezy at times, strongest through the
   Delta and over the higher elevations
 - Slow warming Sunday into Monday, with continued dry conditions

*  Tuesday - Friday:
 - Increased onshore flow with below normal temperatures.
   Temperatures trend up by the end of the week with above normal
   highs and widespread Moderate HeatRisk by Thursday

.Changes from previous forecast...
 - Cooler, below normal temperatures for Tuesday


&&

.AVIATION...


VFR conditions across interior NorCal next 24 hours. Periods of
breezy onshore winds with gusts up to 30 knots in the Delta
vicinity; gusts up to around 25 knots in northern/central
Sacramento Valley, until around 10z Saturday. Gusts up to 35
knots across the peaks of the Sierra next 24 hours.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$