Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 181607
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1007 AM MDT Mon Sep 18 2017

.SYNOPSIS...A cold front will cross northern Utah tonight through
Tuesday. A stronger trough will move into Utah starting late
Wednesday night and will linger over the area through the upcoming
weekend.

&&

.DISCUSSION...Southerly flow continues to increase over the
forecast area this afternoon as a storm system approaches the
Pacific Northwest coast. Ahead of this system dry, breezy, and
warm conditions will persist into the afternoon hours with maxes
running at or slightly above seasonal normals.

The cold front associated with the storm system is progged to
slide into northwest Utah early this evening and move through the
rest of northern and central Utah tonight into tomorrow morning
before stalling. Behind the front, maxes are expected to be about
20F cooler than today, with conditions remaining similar to today
ahead of the front over southern Utah. The main storm system will
be a grazer for northern Utah with not particularly impressive
moisture, but with good jet support northern Utah and southwest
Wyoming could see some decent precip, particularly over the higher
terrain. 700 mb temps are expected to drop to as low as -3C or -4C
near the UT/ID border so snow is possible down to 7000-7500 feet,
but precip will be diminishing as the coldest air moves in.

Maxes are expected to rebound noticeably on Wednesday as the
airmass warms and southerly flow picks up once again ahead of a
stronger Pacific Northwest storm system that brings another good
cold front through Wednesday night into Thursday. The main system
will be slow to move out of the region, so cool and unsettled
conditions are expected to persist into the weekend.

No updates expected to the forecast this morning.

&&

.AVIATION...The SLC terminal will see VFR conditions throughout
the day with increasing high clouds. Southerly winds, gusty at
times, will continue through the afternoon hours

&&

.FIRE WEATHER...Warm and dry conditions will continue over the
district, with temperatures near or slightly above seasonal
normals. Southerly winds will pick up today ahead of an
approaching cold front. This front will move across northern and
central Utah during the day Tuesday, resulting in much cooler
temperatures and a bit of precipitation for northern Utah.
Southern Utah will stay warmer ahead of the front, with breezy
southerly winds continuing. Winds will pick up again across the
forecast area on Wednesday before a stronger system moves through
the district on Thursday, with cool and unsettled conditions
continuing into the weekend.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...None.
WY...None.
&&

$$

Traphagan

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http://weather.gov/saltlakecity

For frequently asked questions about the Area Forecast Discussion
visit...
http://weather.gov/saltlakecity/general/afd_faqs.php



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