Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 172150
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
150 PM PST Sun Dec 17 2017

.Synopsis...
Dry conditions this week except for a chance of rain or snow for
most of the region Tuesday night and Wednesday. Breezy northerly
winds Wednesday night and Thursday.

&&

.Discussion...
Some high clouds passing overhead the next couple of days with a
ridge of high pressure over the area. The ridge will weaken Monday
night into Tuesday and surface flow in the valley will become
light southerly. This will help to increase the dewpoints and may
allow for some patches of fog to form...mainly near the water
ways Tuesday morning from around the Sacramento region southward.

A fast moving weather system will move through the region Tuesday
night into Wednesday and may bring 3 to 7 inches of snowfall to
the mountains with minimal QPF in the valley. Models show the
system a little further west than yesterday which has allowed it
to pick up a little bit more moisture. Colder air moving over the
region may keep daytime highs in the 50s for the valley to the 30s
for the mountains and will likely bring lower snow levels. Breezy
southeast conditions in the valley are expected for at least
several hours as the front moves through.

Dry weather returns for Wednesday night with breezy northerly
winds developing by Wednesday night.

&&
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)

A ridge will build back in for the start of the extended period
bringing dry weather and near seasonal temperatures. The 12z EC
has come more in line with the GFS in dropping a trough south into
the region on Saturday. This could bring a few light showers to
the Sierra throughout day. There is still some disagreement on
this system though and confidence in low and anything we do see
looks to remain light. The trough will also bring in much cooler
air especially in the higher elevations where highs could run
5-10 degrees below normal. Overnight lows look to fall into the
low to mid 30`s in the Valley and teens and 20`s in the higher
elevations.

-CJM

&&

.AVIATION...

VFR conditions expected the next 24 hours. Breezy north winds
10-15 knots gusting to 20 knots near KRDD and KRBL will diminish
by 00z with winds staying under 10 knots overnight and tomorrow.

-CJM
&&

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

$$



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