Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 280257

Area Forecast Discussion
National Weather Service Salt Lake City UT
857 PM MDT Tue Jun 27 2017

.SYNOPSIS...A westerly flow will remain over the forecast area
through Wednesday. A cold front will cross northern and central
Utah Wednesday night into Thursday before high pressure returns
beginning Friday.


.DISCUSSION...Westerly flow aloft prevails across the forecast
area this evening, in between a shortwave trough which passed by
earlier in the day, and an upstream trough currently along the
Pacific Northwest coast. The surface boundary associated with the
former wave pushed into central Utah this afternoon where it has
effectively stalled. To the north, a cooler and more stable
airmass has spread into northern Utah and southwest Wyoming, while
south of the boundary very warm and breezy conditions continue.

The upstream wave is forecast to dig through the northern Great
Basin during the day Wednesday, inducing pressure falls along the
remnant boundary across eastern Utah. This will tighten the
gradient allowing for a breezy day across much of the forecast
area, with a second surge of low level cold advection arriving
across northern Utah late Wednesday afternoon into Wednesday
evening. Additionally, there is a threat of scattered convection
across the north with the passage of the mid level trough axis
late Wednesday afternoon into Wednesday evening.

Going forecast looks in good shape. Will update later on to remove
evening wording once winds diminish across the south.


.AVIATION...Northerly winds at KSLC are expected to switch back to
the south around 04Z, with a small chance this wind shift is
delayed until after 05z. VFR conditions are expected to prevail
through the TAF period, although there is a 20 percent chance of
MVFR vis during the 10-14Z timeframe associated with smoke from
regional wildfires.


UT...Red Flag Warning until 10 PM MDT Wednesday for UTZ479-482-484-

     Red Flag Warning from 10 AM to 10 PM MDT Wednesday for UTZ478-




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