Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 181501

Area Forecast Discussion
National Weather Service Salt Lake City UT
901 AM MDT Fri May 18 2018

.SYNOPSIS...A slow moving storm system will move across the area
through Saturday, resulting in continued showers and
thunderstorms, primarily over northern and central Utah.
Conditions will remain unsettled Sunday into Monday ahead of
another slow moving disturbance that will move through the area
beginning Tuesday.


.DISCUSSION...Core of 500mb cold pool is over northern Utah
(north end of the GSL) this morning causing scattered showers and
isolated thunderstorms earlier. The lapse rate between 700mb and
500mb is forecast to go from about -20C this morning to -18C this
afternoon as the 500mb cold pool moderates. With the thermal
dynamics weakening have pulled back on the valley PoPs across
northern Utah except directly under the cold pool near the
northern tip of the GSL.

Farther east and south have lowered or removed PoPs this morning
as the dynamics are weak and instability is limited this morning.
However, by afternoon the lapse rates increase across the south
and east, especially over the mountains, so have scattered PoPs in
the mountains and isolated in the valleys.

The upper low moves east of the area by this evening with weak
anticyclonic flow developing over the extreme northwest corner of
Utah so have lowered PoPs there for the evening.


.AVIATION...Northerly winds at the SLC terminal are beginning to
settle in, although they may be light and variable through 16-17z
before becoming stronger northerly. Main concern for SLC today
will be showers and thunderstorm hazards through the daylight
hours (18-02z) with possible gusty/erratic outflow winds,
lightning and temporarily low cigs.





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