Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 011651
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
951 AM MST Thu Dec 1 2016

.SYNOPSIS...A weak storm system will bring light snow to portions
of northern and central Utah through early tomorrow. High pressure
will move over the area late Friday through early Sunday before a
cold storm system impacts the region early next week.

&&

.DISCUSSION...A weak trough is making its way across northern Utah
this morning. Though moisture and instability is not particularly
impressive with this system, an area of light snow has developed,
primarily in the vicinity of an ill-defined surface boundary. The
snow showers will continue into the afternoon hours before
weakening as the first wave of the trough shifts east.
Accumulations will remain light at best, but there is an outside
chance of lake enhancement, resulting in a few heavier showers.

The boundary is expected to dissipate late this afternoon/early
this evening. Some additional shower activity is possible over
northern Utah tonight into Friday morning as the second part of
the trough rotates in, but overall forcing will be less impressive
than what is presently over the area. That wave is then expected
to merge with a trough over the California coast during the day
Friday as they both continue to weaken.

The track of the merging troughs will result in a good northeasterly
pressure gradient developing over southwest Utah late
tonight/early Friday, persisting through early Saturday. Combined
with relatively strong cold advection, this provides a favorable
scenario for strong northeast winds in favored Washington county
locations. Current forecasts would indicate a high-end
advisory/borderline warning event. Current High Wind Watch covers
the threat well at present, and will make a decision on upgrading
this afternoon.

Behind the weakening trough, high pressure centered off the
California coast is expected to build in late Friday through early
Sunday before another system arrives for early next week. Global
models continuing to indicate the coldest temperatures of the year
arriving by Tuesday, with 700 mb temps dropping as low as -18C.

Updated the forecast earlier to adjust POPs with current trends.
No additional updates planned.



&&

.AVIATION...Expecting northerly winds to persist at KSLC terminal
through the afternoon in and out of snow showers, with MVFR to IFR
conditions. Showers will taper off after 21z, and winds should
switch to southerly between 00z-01z. Another chance for showers
between 06-07z may switch the winds to northerly.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...High Wind Watch from late tonight through Saturday morning for
     UTZ019.

WY...None.
&&

$$

PUBLIC...Traphagan
AVIATION...Dewey

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