Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 170332

Area Forecast Discussion
National Weather Service Salt Lake City UT
932 PM MDT Fri Jun 16 2017

.SYNOPSIS...A cold front will make its way across much of the
forecast area tonight and into Saturday. High pressure will
strengthen over the West early next week, resulting in hot
temperatures across the forecast area.


.DISCUSSION...A near-zonal large-scale pattern remains in place over
the western CONUS this evening with an upper jet extending across
the Pacific Northwest through the northern Rockies. A weak shortwave
trough embedded in the flow is evident across Washington state and
moving into northern Idaho. This trough is responsible for pushing a
cold front through Idaho, and this front is expected to cross
northern Utah tonight and central tomorrow before slowly filtering
into southern Utah tomorrow night.

GOES PWATs are near an inch near the Idaho border this evening and a
few showers and thunderstorms are noted across southeastern Idaho
where some instability exists. However, SREF indicates that the
instability will wane tonight. As such, even though higher PWATs
will accompany the front through Utah tonight, any showers and
thunderstorms that do manage to develop over Utah will remain
confined to near the Idaho border and weaken over time.

Otherwise, the cold front will bring a bit of cooling to northern
Utah tomorrow. However, temperatures for much of next week will be
rather warm and with record to near record heat in some areas.
Triple digit highs are forecast for the lower valleys of southern
Utah. An Excessive Heat Watch remains in effect for Monday through
Thursday for parts of southern Utah.

No updates this evening.


.AVIATION...Southeast winds this evening are expected to shift to
the northwest between 07-09z and persist through the night as a dry
cold front reaches the KSLC terminal. There is a 20 percent chance
that this switch to northwest winds occurs after 09Z.


UT...Excessive Heat Watch from Monday afternoon through Thursday
     evening for UTZ013-019>021.




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