Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 191626
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
926 AM MST Mon Feb 19 2018

.SYNOPSIS...A winter storm will impact much of Utah through early
Tuesday. A series of weather disturbances are expected to impact
the area for the middle to latter part of the work week.

&&

.DISCUSSION...A broad and cold storm system continues to move
through the region this morning. The associated cold front on the
front side of the trough is near a KSGU-KRKS line and is moving
little. Precipitation, heavy at times, is continuing along and
behind the front, with snow even reported in St. George.

The main trough will slide roughly east today, pushing the cold
front out of the forecast area by this evening. This will,
however, put the main cold pool over Utah and southwest Wyoming
this evening into Tuesday. This will allow snow to continue,
though it will be more orographic in nature. Some concern remains
for lake enhancement tonight as well due a cold airmass (700 mb
temps progged to drop to as low as -17C tonight and -20C by
sunrise) moving over a much warmer lake with decent low level
moisture.

The very cold airmass moving over the forecast area will result in
some of the coldest low temperatures of the season so far tomorrow
morning. Given the very mild weather in the days prior to the
storm, many trees and plants have already started to bloom and
could be damaged by the cold. These temperatures will also act to
exacerbate existing travel difficulties as road treatments do not
work as well in those temperatures.

Snow will tend to taper off during the day Tuesday as the main
trough exits, allowing weak high pressure to temporarily move back
in. However, global models indicate a continued active pattern
over the next several days with a weak shortwave moving through
late Wednesday into Thursday and a potentially stronger system
moving through Thursday night into Friday.

No updates expected to the forecast this morning. However, Winter
Storm Warnings for northern Utah valley locations are set to
expire around midday but may need to be extended if snowfall
continues at current rates.


&&

.AVIATION....IFR conditions in snow will generally prevail this
morning/early afternoon at SLC although brief periods of LIFR can`t
be ruled out when strong winds combine with higher snow rates. An
additional inch or so of snow accumulation is possible on untreated
surfaces through 22Z. Conditions are expected to improve to MVFR/VFR
around 21-22Z with snow showers remaining in the vicinity of the
terminal. Winds will remain from the northwest throughout the day
and may be strong at times.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Wind Advisory until 4 PM MST this afternoon for UTZ013-020-021.

     Winter Storm Warning until 4 PM MST this afternoon for UTZ006-
     008>010.

     Winter Storm Warning until noon MST today for UTZ001>004-007.

     Winter Storm Warning until 9 PM MST this evening for UTZ014>016-
     517-518.

WY...Winter Storm Warning until noon MST today for WYZ021.

&&

$$

PUBLIC...Traphagan
AVIATION...Carr

For more information from NOAA`s National Weather Service visit...
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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