Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 290337

Area Forecast Discussion
National Weather Service Salt Lake City UT
937 PM MDT Fri Apr 28 2017

.SYNOPSIS...A cold upper low near the Four Corners region will
move slowly into the southern Plains by late Saturday. A couple of
weak weather disturbances will graze the area Sunday night and
again Tuesday. Strong high pressure aloft will finally reach the
area around the middle of the week.


.DISCUSSION...The upper low has closed off near the 4 corners
this eve with wraparound moisture continuing to stream westward
across WY and swd across UT. Showers have persisted across the CWA
thru the eve in this moisture and are forecast to become more
isolated but continue overnight, most numerous over swrn UT and
swrn WY.

Easterly flow aloft around the closed low is developing over nrn
UT and this should surface along the Wasatch Front later this eve
as an inverted surface trof slides west of the Great Salt Lake.

This will bring an end to the showers but canyon winds will
develop with gusts into the 50 mph range, lasting into Sat
morning. The n-nely flow across swrn UT will also be favorable
for a gap wind event across Washington Co and expect similar gusts
in this area into Sat morning. Wind Advisories for these areas
remain in effect.

The clouds and showers spreading into swrn UT overnight look to
hold mins up somewhat tonight altho the cold airmass in place
could still allow a few areas to dip into the upper 20s with any
partial clearing. Will leave Hard Freeze Warning in effect.

The airmass dries and warms tomorrow altho it will still feel
chilly with breezy north winds persisting thru the day. Additional
warming is expected Sun with less wind altho mid and high clouds
spread in ahead of a weak short wave trof grazing the nrn CWA Sun

Updated earlier to add isolated pops to sern zones this eve. No
additional updates planned at this time.


.AVIATION...VFR conditions are expected to prevail at the SLC
terminal tonight. Passing rain showers will briefly lower CIGS to
MVFR until about 05z. CIGS will lift above 7000 ft after 06z-
07z. Northwest winds are expected through about 05-07z, with winds
staying mostly light northerly after that. However winds will
become light and variable at times between 07z-16z as the
easterly flow aloft surfaces primarily north of the airfield.


UT...Hard Freeze Warning from midnight tonight to 9 AM MDT Saturday
     for UTZ014>016.

     Wind Advisory until 10 AM MDT Saturday for UTZ002-019.




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