Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 221545

Area Forecast Discussion
National Weather Service Salt Lake City UT
945 AM MDT Wed Mar 22 2017

.SYNOPSIS...A Pacific storm system will move east across the
Great Basin through Thursday, followed by a return of high
pressure for the end of the work week. Another storm system will
cross the region during the upcoming weekend.


.DISCUSSION...An upper trough axis situated along the Pacific
Coast this morning will gradually work its way inland and across
the Interior West and impacting the forecast area over the next
36 hours. At the present time deep layer southwesterly flow
downstream from this trough axis resides across the Great
Basin region, while at the surface a frontal boundary extends from
near Tonopah NV northeastward to near Dugway, then eastward
across the southern Wasatch Front near Provo.

A shortwave ejecting across northern Utah this morning was
accompanied by a round of showers and isolated thunderstorms.
This wave has since lifted into southeast ID, while another
feature is noted in water vapor imagery crossing southern NV. This
upstream feature is forecast to lift across central and southern
UT this afternoon, bringing another round of convection to the
forecast area into this evening. Could see a few severe wind gusts
accompany this convection across areas south of the frontal

The main upper trough axis is forecast to translate across the
forecast area late tonight through Thursday morning, with the
leading 700mb trough axis/surface boundary pushing through
northern and central Utah overnight dropping snow levels to near
7000 feet. This will be followed by a period of northwest low
level flow within a fairly unstable environment through the day
Thursday, resulting in precipitation becoming more orographic in

Updated the forecast earlier to trim PoPs this morning in the wake
of the departing wave.


.AVIATION...Conditions at the SLC terminal are expected to be at VFR
levels through the day with showers developing near and over the
terminal. Ceilings may briefly fall below 6000ft especially during
the late afternoon with the heavier rain/storms expected. Light and
variable winds this morning should become stronger out of the north
after 20z.





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