Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 161456
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
856 AM MDT Mon Apr 16 2018

.SYNOPSIS...A cold trough along the West Coast will move in
across the western Great Basin today and across Utah tonight
through Tuesday. The associated cold front will reach northwest
Utah late this afternoon, then track across the area tonight
through early Tuesday. High pressure will return Tuesday night
through midweek, followed by the next storm system late in the
week.

&&

.DISCUSSION...Southwesterly flow aloft prevails across the Great
Basin this morning, downstream from a cold upper trough situated
along the Pacific Coast. The associated low level baroclinic zone
stretches from central Idaho back through northeast and central
Nevada with regional radar imagery indicating precipitation along
this boundary. A shortwave is noted rounding the base of the
larger scale Pacific trough, and is forecast to eject inland and
across the region later tonight before lifting through the
forecast area late tonight through Tuesday morning.

Pressure falls ahead of this approaching shortwave coupled with
mixing of stronger momentum aloft (700mb flow around 50 kts
through the day) will result in strong southerly winds across much
of the forecast area through the day. Going wind headlines seem
to handle this well.

The surface cold front is forecast to push into northwest Utah
this afternoon, then through the Wasatch Front later this
afternoon through early evening. As the approaching upstream wave
interacts with this boundary, precipitation is forecast to become
more widespread late this evening through the overnight hours
along the trialing baroclinic zone from the Wasatch Front south
along the I-15 corridor and adjacent terrain to near Beaver. Snow
700mb temps falling to near -10C should drop snow levels to the
valley floors overnight, and favorable low level northwest flow,
lingering moisture, and steep lapse rates will maintain
orographically forced snowfall along the terrain east of the I-15
corridor, as well as allow the potential for lake effect snowfall
downwind of the Great Salt Lake as well as Utah Lake.

Going forecast seems to handle this reasonably well. Will continue
to monitor trends but no updates are planned at this time.

&&

.AVIATION...Strong southerly winds will continue at the SLC
terminal through the afternoon. A dry cold front will cross the
area between 23-01Z, shifting winds strongly to the northwest.
There is the potential for a period of blowing dust near the
front.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Wind Advisory from noon today to 10 PM MDT this evening for
     UTZ013-014-019>021.

     High Wind Warning until 10 PM MDT this evening for UTZ003-005-
     015-016.

     Wind Advisory until 10 PM MDT this evening for UTZ002-004.

WY...None.
&&

$$

Seaman/Kruse

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