Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Salt Lake City Utah
959 PM MST Monday Mar 2 2015
Synopsis...the next storm system will cross the region Tuesday.
High pressure will bring a drying and warming trend for the latter
half of the week.
Discussion...the storm system that has impacted the area the past
few days is ejecting out across Utah as an open wave trough at this
time...with 700 mb winds now having turned northwesterly across western
Utah. Precipitation filled in this evening along the Wasatch
front...with snow reported down to the valleys floors. Bulk of
accumulations have been on bench areas. A band of showers is also
evident across south-central Utah which produced lightning earlier
but this is band has been gradually weakening.
A bit of a break in precipitation can be expected
overnight...although a few showers are expected to linger. An
upstream trough currently seen dropping south through Idaho will
quickly approach the area and sweep a cold front through Utah
tomorrow...bringing with it another round of precipitation. This
storm will be cold enough for accumulating snow to the valley
floors. Impacts to the morning commute can be expected along the
Wasatch front. Across central and southwest Utah...the heaviest snow
is expected during the afternoon hours.
Despite the expected break in weather...winter weather warnings and
advisories continue for mountains...Wasatch front and Cache
Valley...Wasatch back and southwest Wyoming due to the additional
snowfall expected tomorrow. Have allowed the highlights for the
southern valleys to expire due to waning precipitation. The I-15
corridor near Cedar City could still see a period of intense snowfall
behind the front...but this will not occur until tomorrow afternoon.
High pressure will build into the area tomorrow evening and continue
for an extended period of time...returning a drier airmass to the
Updated mainly to make minor adjustments to sky cover...decrease
probability of precipitation across the southwest...and to remove thunder wording across the
south that was added earlier.
Aviation...ceilings at the slc terminal are expected to remain 6000ft
or less through much of the night. There is a 30 percent chance of
brief additional snow showers during the overnight hours which could
temporarily bring IFR conditions back to the area. The next round of
snow is expected to start about 12-13z but the heavy snow is
expected to occur between 15 and 18z when a few inches could
accumulate on untreated surfaces. There is a 40 percent chance that
vlifr conditions will occur for a time between 15 and 18z.
Utah...Winter Storm Warning until 4 PM MST Tuesday for utz008-009-518.
Winter Weather Advisory until 4 PM MST Tuesday for utz007-010-
Winter Weather Advisory until noon MST Tuesday for utz001>004-
Wyoming...Winter Weather Advisory until 4 PM MST Tuesday for wyz021.
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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)