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fxus65 kslc 101759 

Area forecast discussion
National Weather Service Salt Lake City Utah
1059 am MST Sat Dec 10 2016

Synopsis...a moist westerly flow over the region will dry out on
Sunday. Additional moisture will spread back into the area on
Tuesday and persist through Wednesday.


Discussion...strong moist westerlies cover the nrn County Warning Area this
morning with fairly widespread precip in the valleys south to
about Provo with mtn snow noted farther south. Snow levels are
hovering around 6500-7000 ft altho a few valleys across far nrn Utah
have held onto the low level cold air and snow has been falling
along portions of I-84 north of the gsl.

Mountain routes south to around Huntington Canyon are getting snow
per udot cams and roads across the western half of our Wyoming zone
are also snowy.

Expect the far nrn valleys to continue to mix out through midday
with precip changing over to rain there but the snow will persist
in the mtns and across Wyoming with little change in snow levels thru
this eve. The current warnings for the mtns are on track and have
added winter weather advisories for the Wasatch Plateau and our
Wyoming zone thru tonight.

Morning models held onto the idea of a weakening cold front
sagging south thru the County Warning Area tonight with precip tapering off fairly
quickly behind it. This should drop snow levels to the valley
floors but suspect duration will be short and impact minimal.

The fast westerlies will persist but drier conditions spread over
the area by midday sun and last thru Mon night with maybe a little
precip lingering along the Idaho border.

The flow starts to buckle by Tue as low amplitude ridging develops
over the W coast and a warm front forms over our County Warning Area with precip
filling in over the north again, lasting thru Wed.

Updated earlier to add advisory headline and raised qpf a little
for today. No additional updates planned.


Aviation...south winds will generally prevail at the kslc
terminal through the day...although winds may be variable at
times. Winds are expected to become northwest between 0200-0400
UTC tonight. However...there is a 30 percent chance that the winds
could switch prior to 0200 UTC. Occasional MVFR visibilities are
expected in rain into this evening and in a rain/snow mix after
0400 UTC.


Slc watches/warnings/advisories...
Utah...Winter Weather Advisory until 9 am MST Sunday for utz010.

Winter Storm Warning until 9 am MST Sunday for utz007>009.

Wyoming...Winter Weather Advisory until 9 am MST Sunday for wyz021.




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