Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 201708

908 AM PST Sat Dec 20 2014

Light Rain and light mountain snow continue today, diminishing on
Sunday. Dry Monday and Tuesday under high pressure ridge. There is
a chance another system may impact the region Wednesday into
Christmas Day.


A weak warm front is moving through the region. The atmosphere is
very moist so there is a chance of showers. Any showers should be
light for most areas other than in the far north where there is a
greater chance of seeing some moderate rain. Snow levels will be
rising throughout the day so by early afternoon expect them to be
above major trans-sierra pass levels. Skies should remain cloudy
today over the interior.

Moisture will continue to stream into the region through Sunday
evening before a strong ridge of high pressure builds over the
interior to keep things dry for several days. Fog may becone an
issue each night and morning.

.Extended Discussion (Wednesday through Saturday)

Models continue to be all over the place with solutions on the
Christmas Eve system lending poor confidence to the forecast. EC
continues to be the most bullish spreading precipitation southward
into Central CA while both the latest GEM and GFS operational runs
only slightly dent the ridge over the area and spread
precipitation only as far south as the northern mountains. We`ll
continue to monitor trends with this system. Drier northwesterly
flow forecast over the area in the wake of the system heading into
next weekend.



Widespread IFR/MVFR conditions continue across Valley TAF sites as
abundant moisture remains over the region. IFR/LIFR conditions
will continue over the mountains. Scattered showers will move
through the area today. Snow levels 050-060 will rise to above
080 by early Sunday. SE winds 8-16 kt will continue across the
Valley today.



.STO Watches/Warnings/Advisories...
winter weather advisory until 10 am pst this morning above 6000
feet in the west slope northern sierra nevada.


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