Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 200353

Area Forecast Discussion
National Weather Service Salt Lake City UT
853 PM MST Sun Nov 19 2017

.SYNOPSIS...A couple of weak weather disturbances will graze
northern Utah and southwest Wyoming late Monday through early
Tuesday. Strong high pressure aloft will cover the interior west
during the middle and latter portions of the week.


.DISCUSSION...The low amplitude upper ridge across the western
CONUS will begin to build along the west coast Monday, then shift
east and evolve into a strong ridge across the interior west mid
to late week.

Ahead of this building ridge a couple of weak shortwaves will
crest the ridge and ripple east-southeast across far northern
Utah and southwest Wyoming late Monday through early Tuesday. The
rather impressive moisture plume moving northeast from the low-
latitude central Pacific will focus in on the central California
through Oregon coasts. A piece of this moisture plume will get
tapped by the first shortwave, with this moisture accompanying
this feature into northern Utah.

Looking at a somewhat improved chance for measurable precip owing
in large part to the significantly improved moisture profile. Lift
will be largely driven by deep layer thermal advection supported
by dynamic lift associated with the shortwave. The subsequent
shortwave late Monday night/Tuesday will still find plenty of deep
layer moisture, though with heights building and the flow aloft
become more anti-cyclonic the chance for measurable precip will
likely be greatly reduced.

Once the now strong upper ridge becomes firmly established across
the interior west mid to late week a warming trend with dry
conditions will exist across the region through the end of the
week. Travel impacts in Utah and southwest Wyoming are not
expected throughout the holiday weekend.


.AVIATION...Southeasterly winds are expected to become established
at the SLC terminal by around 04z and persist through the night.
Ceilings will lower through the overnight hours, but should remain
well above 7000 feet through at least 14Z.





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