Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 151615

Area Forecast Discussion
National Weather Service Salt Lake City UT
915 AM MST Fri Dec 15 2017

.SYNOPSIS...High pressure will reside across the area today. A
Pacific system will cross the area Saturday. High pressure will
build into the area once again Sunday into Tuesday with another
storm expected Wednesday.


.DISCUSSION...The area remains on the fringes of the flattening
mid-level ridge today. Some patchy fog has developed over portions
of the Utah, Heber, and Cache valleys this morning and adjusted
fcst to account for this. Temperatures warm aloft a couple degrees
over most of the area today so expect one last day of valley
inversions and haze before the arrival of tomorrow`s system. Cloud
cover gradually increase northwest to southeast this
evening/overnight as flow backs to more southwesterly in advance
of the incoming Pacific trough.

The splitting system tomorrow does not look particularly
impressive from a dynamics standpoint with a lot of energy going
into the southern split. Additionally cold pool instability is
meager with h5 temps staying at or above -25C coincident with h7
temps around -10C. Still given moist northwest flow lingering for
several hours behind frontal passage currently think that 3-6
inches will be possible in the Northern Mountains. Northern
valley impacts are questionable but given cold surfaces some
travel impacts would be possible even with only an inch or two of
accumulation. Will see how 12Z guidance trends before updating
snow amounts and will also further coordinate with partners on
messaging and potential impacts.


.AVIATION...Visibilities at the SLC terminal should generally
fluctuate between 5SM and 7SM through much of the day. Winds are
expected to switch to the northwest around 19-21Z, with only a
slight chance that stronger southeasterlies persist past 21Z.





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