Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 180454

Area Forecast Discussion
National Weather Service Salt Lake City UT
954 PM MST Fri Feb 17 2017

.SYNOPSIS...The upper level trough along the California coast
will slowly cross the Great Basin through the weekend. High
pressure aloft will briefly return early next week, followed by
another round of active weather.


.DISCUSSION...The deep upper trof is moving on to the west coast
this evening with a mild southerly flow over the Great Basin. A
short wave ejecting nwd out of the trof crossed the CWA this aftn
thru this eve and should shift off to the north later tonight.

Organized but mostly light precip was widespread with this wave
and should continue over the nrn CWA past midnight. The airmass is
fairly moist across the rest of the CWA and orographics have kept
precip going in locations favored in southeasterly flow. This
should continue overnight, and increase towards daybreak and thru
Sat, with the nwrn CWA staying fairly dry.

The upper trof swings thru the ern Great Basin Sat night into Sun
with the flow switching to westerly behind the trof axis, and a
fairly organized band of precip along and ahead of it.

Snow levels have stayed high enough to keep any travel impacts
above about 9000 ft so far and this will remain so thru tomorrow.
Snow levels lower on Sat night and Sun with the trof axis with a
corresponding increase in impacts but snow levels will stay above
most valley floors and even if they do briefly lower, valley roads
should stay just wet.

Short wave ridging brings and end to the precip Sun night with a
warm front bringing it back into nrn UT on Mon, altho the EC is
much weaker with this front, and possibly better.

Updated earlier to adjust pops overnight to match existing trends.
No additional updates planned.


.AVIATION...VFR conditions will prevail at the KSLC terminal
through the night and into Saturday. There is a 20 percent chance
of cigs briefly dropping to around 6000 feet in passing rain
showers. South winds will also prevail and could be gusty at





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