Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 180407
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1007 PM MDT Mon Apr 17 2017

.SYNOPSIS...A weak cold front will stall across central Utah
tonight. A stronger storm system will cross the area Tuesday
afternoon through Tuesday night. Another storm is possible late
Thursday into Friday.

&&

.DISCUSSION...Southwesterly flow aloft prevails across the
Intermountain region this evening, downstream from a longwave
trough situated off the Pacific Coast. A surface boundary which
pushed through northern Utah earlier remains stalled across
central Utah this evening.

A shortwave trough and associated jet streak currently near 135W
is forecast to eject inland and across the Great Basin during the
day Tuesday. Backing flow ahead of this wave will result in warm
advection to the north of the surface boundary, which is forecast
to slowly retreat overnight. This will bring a chance for showers
north of I-80 late tonight but moreso into the morning hours
Tuesday. Have lowered PoPs across the far north into the
chance/slight chance category for tonight due to the slower onset.

The ejecting wave is forecast to light up the surface boundary
late Tuesday afternoon through Tuesday evening as it pushes back
south as a cold front through northern and central Utah. Ample
moisture along with a mild airmass should yield fairly substantial
QPF of 0.50 inches or more across most northern valleys, with
snow levels remaining above 8000 feet for most of the event.

Additionally, surface pressure falls coupled with strengthening
flow aloft to the south of the boundary should result in windy
conditions across most of southern Utah Tuesday afternoon and
evening.

&&

.AVIATION...VFR conditions are expected at KSLC through the
overnight hours. Winds are expected to remain northerly, with a 40
percent chance they switch back to southerly after 08Z.

&&

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

$$

Seaman

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



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