Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 190256

Area Forecast Discussion
National Weather Service Salt Lake City UT
856 PM MDT Thu May 18 2017

.SYNOPSIS...A cold upper low centered over the Utah Colorado
border will continue to move slowly east tonight. High pressure
will temporarily build into the area later Friday into Saturday,
before another, weaker trough clips northern Utah on Sunday.


.DISCUSSION...The large cold upper low is centered just north of
the 4 corners this evening. Clouds and precip wrapping wwd around
the low across WY are spreading into nrn and wrn UT. The
convection across srn UT from earlier today is quickly
dissipating with the loss of daytime heating.

The precip in the wrap around has for the most part stayed north
and east of SLC so far this eve but it is forecast to continue
spreading south with diminishing coverage overnight. The precip
along the Wasatch Front will taper off thru about midnight as
easterly flow becomes established at all levels.

With the clouds spreading swd overnight, temps in the swrn and
central valleys may not end up dropping into hard freeze
territory altho any local clearing could send a few spots below
30F, especially in the Sanpete and Sevier valleys. The downslope
winds along the Wasatch Front should hold temps up there. The
Freeze Warning will remain in effect.

The upper low continues to move slowly east overnight thru Fri
with gradual clearing and drying on Fri. Temps will stay on the
cool side but will warm up a bit from today.

Short wave ridging is forecast for Fri night and Sat with temps
warming back up to near normal and mostly clear skies. A weak trof
slides across the nrn CWA on Sun with a threat of showers while
the south stays dry and warm.

No updates planned at this time.


.AVIATION...The SLC terminal will see light north to northeast
winds prevail through 04Z, before winds shift to the southeast.
Ceiling will likely hover close to 6000 - 7000 feet AGL through
12Z, but there is a 30% chance of MVFR cigs developing near
showers through 06Z. Diurnally driven winds can be expected
Friday, with winds shifting out of the northwest by 17Z.


UT...Hard Freeze Warning from midnight tonight to 9 AM MDT Friday for




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