Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 181630

Area Forecast Discussion
National Weather Service Salt Lake City UT
1030 AM MDT Thu May 18 2017

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


.DISCUSSION...Hard freeze conditions occurred in the Cache Valley,
western Uinta Basin, Wasatch Back, Sanpete and southwest valleys
last night as skies cleared for a time overnight. Those clear
skies over northern Utah will be short lived as moisture from a
wrap around circulation moves in from the east today. Have boosted
PoPs along the northern Wasatch Front and Cache Valley for this
afternoon as models show good convergence along the 700mb
northerly flow over the northwest valleys and a moist easterly
flow across southwest Wyoming and northern Utah mountains late
this afternoon.

Farther south, clear skies should remain well into the afternoon
over southern and east central portions of the CWA, but partly
cloudy skies will develop this afternoon as the cold temperatures
aloft associated with a 500mb trough swings southward across
southern Utah this afternoon and evening. Over the southwest
valleys and southern mountains expect rain and snow showers to
become more widespread this afternoon as the deeper moisture in
place is acted upon by the 500 mb trough passage.

Temperatures will continue to be on the cool side at 10-20
degrees below normal for this time in May.


.AVIATION...Northerly winds will prevail at the SLC terminal
through about 04Z then shift to the southeast. Cigs should remain
above 7K ft AGL through about 21-22Z but have a 40 percent chance
of lowering to between 4 and 6K ft AGL by 18Z.





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