Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 091731

Area Forecast Discussion
National Weather Service Sacramento CA
931 AM PST Fri Dec 9 2016

Wet weather tonight through Saturday. Periods of wet weather
likely to continue mid-to-late next week.


Moist westerly flow continues over the western US. Radar imagery
shows a few light showers across interior northern California,
mainly up along the mountains. Otherwise, low clouds and patchy
fog are blanketing the region.

The next plume of moisture is rapidly approaching the area, and
should bring precipitation later today and into Saturday. Valley
precipitation should remain light for the most part, and moderate
to heavy precipitation is expected for the Sierra. Precipitation
rates suggest that hydrologic impacts will be limited. Snow
levels are forecast to be very high for the bulk of the event
(potentially 9000 ft or above along the Sierra). However, snow
levels will lower below major passes Saturday evening as
precipitation starts to wind down, and could bring light
accumulations along Interstate 80 and Highway 50.

Mainly dry weather is expected Sunday into Monday as a flat ridge
of high pressure moves across California.



Pacific moisture plume will bring precipitation into the area
Tuesday into Wednesday, focused over the northern Sierra. Snow
levels will initially be below pass levels, then rise above them
during the day Wednesday. This could bring some travel impacts in
the mountains. Models diverge after Wednesday, with high
uncertainty on timing of following systems. Will keep general
chances of precipitation through the extended, though there will
likely be breaks at times. Late in the week there are hints of a
cold system with low snow levels, but timing and precipitation
amounts are uncertain. EK



Widespread MVFR CIGS/VIS with areas IFR will continue next 24
hours under warm-advection regime. Locally strong southwesterly
winds across the higher elevations of the northern Sierra Nevada.


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