Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 280405

905 PM PDT Mon Oct 27 2014

Continued mild weather through Thursday. A frontal system will
impact northern interior California Friday (Halloween) and
Saturday with Valley rain and Sierra snow.


.Short Term Discussion (Today through Thursday)...
A flat ridge will be over the area and will amplify slightly on
Thursday ahead of the next system. Other than a few high clouds
at times skies will remain mostly sunny. No major swings in
temperatures the next few days with daytime highs warming to the
70s and nighttime lows in the 40s for the valley. Highs in the
mountains will range from the 50s and 60s with nighttime lows
cooling off into the upper 20s to mid 30s for the mountain

.Extended Discussion (Friday through Monday)

Confidence continues to increase that we`ll see a significant
winter-like system affecting the region Halloween into Saturday.
Timing of the initial frontal system moving inland has improved
with the 00Z Monday operational runs of the GFS, EC and GEM
pointing toward daytime Friday for the onset of precipitation with
showers continuing Friday night and Saturday as the upper trough
moves overhead. Moderate amounts of precipitation, gusty winds and
potentially moderate amounts of snowfall for the higher
elevations of the northern Sierra will be possible with this

Trough shifts east Sunday with ridging forecast to return into
early next week leading to a return of dry northwesterly flow for
much of interior NorCal and a retreat of precipitation chances to
around the Oregon border.




Flat ridge moves over NorCal next 24 hours resulting in general VFR
conditions. Occasional periods of high clouds will move through
the area.


.STO Watches/Warnings/Advisories...

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