Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Salt Lake City Utah
1004 PM MST Thursday Dec 5 2013
Synopsis...the forecast area will remain under a very cold upper
level trough through the end of week. The next cold storm system
to rotate through the trough will impact the area over the
Discussion...a mean cyclonic flow pattern remains over the area
this evening...keeping a very cold airmass in place. Mostly clear
skies exist across the south...but lingering moisture continues to
produce clouds over the north. This cold air has allowed the airmass
to become unstable over the warmer Great Salt Lake. These lake-
effect showers will continue through much of the night...although
most will be confined to over or near the immediate vicinity of the
lake due to light flow. Otherwise...overnight mins will be very cold
again areawide...especially across the high terrain and southern and
central valleys where significant snow cover remains. Double-digit
temperatures below zero will be common again in some of these areas
like they were last night.
A switch to a warm advection pattern will occur tomorrow in advance
of the next approaching storm system. This next storm is still
prognosticated to arrive Saturday morning...bringing snow to the area
initially in a southwest flow pattern through the afternoon. The
flow will turn northwesterly Saturday night...with the area being
treated to another blast of cold Arctic air. Snow will start to
taper off Sunday morning...but accumulating snow is expected across
much of the area Saturday through Saturday night even in Dixie. The
snow will be heavy at times. However...even where snow is
light...any accumulation is expected to cause hazardous travel
conditions so a Winter Storm Watch is in place for the entire
Updated to adjust min temperatures for tonight...mainly lowering
them in some spots.
Aviation...surface winds at the slc terminal are expected to remain
southeasterly through the night. There is a slight chance of brief
MVFR or IFR conditions in light lake effect snow showers after 06z
today...but little to no accumulation is expected.
Utah...Winter Storm Watch from Saturday morning through Sunday
afternoon for utz001>016-019>021-517-518.
Wyoming...Winter Storm Watch from Saturday morning through Sunday
afternoon for wyz021.
For more information from National oceanic and atmospheric administration/S National Weather Service visit...
http://weather.Gov/saltlakecity (all lower case)
For frequently asked questions about the area forecast discussion
http://weather.Gov/saltlakecity/general/afd_faqs.Php (all lower case)