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Area forecast discussion 
National Weather Service Sacramento California
259 PM PDT Friday Sep 4 2015

Synopsis...
the chance of showers and/or thunderstorms to the northern
mountains will diminish by Saturday morning, with Lassen Peak
potentially seeing some light snow. Breezy north winds over the
weekend warming to near normal by Sunday. A little warmer than
normal next week under upper level high pressure.

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Discussion (tonight through monday)...
upper trough passing through northern California this afternoon
with isolated showers and thunderstorms over Siskiyou County and
into northern Shasta County. The thunderstorm threat will likely
extend into the evening, while the shower threat continues
overnight over the southern Cascades and the extreme northern
Sierra (shasta and Plumas counties). The upper low will drop
southward with enough instability and cold air to generate light
snow over Lassen Peak tonight. The upper low is then projected to
swing quickly eastward into the Great Basin Saturday inducing a
northerly surface gradient behind the departing low that will
bring breezy north to northeast winds to much of the forecast
area over the weekend. Winds will be strongest down the west side
the Sacramento Valley and adjacent foothills, and the overnight
to mid morning hours down the Sierra. Monday begins the gradual
building of the ridge with warming temperatures. Jclapp

Extended discussion (tuesday through friday)
upper ridging over the epac will gradually build over interior
northern California through the extended forecast period. Dry
weather will result with above normal temperatures. Highs
temperatures in the Central Valley are expected from the mid 90s
to around 100 degrees in the north, with mostly 80s to low 90s for
the mountains and foothills.



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Aviation...
VFR conditions next 24 hrs except for potential MVFR
cigs in Shasta mountains and extreme northern Sierra into tonight.
Typical northerly winds develop Sat behind trough. Jclapp

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Sto watches/warnings/advisories...
none.
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