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Area forecast discussion 
National Weather Service Salt Lake City Utah
922 PM MST Tuesday Nov 24 2015

Synopsis...a cold upper low will settle into the Great Basin
Wednesday. This low will continue to impact the area through the
Thanksgiving weekend.


Discussion...the cold upper low along the northern California coast is
beginning to shift inland this evening. This will keep a strong
southerly flow aloft over our County Warning Area through the night with winds
staying up across most of the western valleys. The winds dropped
off at slc late afternoon through this evening allowing the temperature
to dip into the middle 30s but they are starting to blow again now
and temperatures have jumped back up into the upper 40s and will likely
stay warm for the rest of the night.

The cold front is moving into eastern Nevada at this time but is forecast
to slow its eastward advance not moving into Utah until around 12z Wednesday
and reaching the I-15 corridor around 21z. The new NAM shows the
precipitation along the southern end of the front becoming disorganized
as it crosses southwestern Utah and does not fill in the northern Wasatch front
until after 00z. It is still generating accumulating snow from
about Nephi north Wednesday night with the greatest amounts north of
about Ogden and westward along the Idaho border as well as eastward into
southwestern Wyoming. Current suite of winter weather highlights appears on

This new NAM is quite a bit more aggressive with the canyon winds
for the Wasatch front Thursday afternoon into Friday morning showing a 14 mb
surface gradient between Riverton and slc by 12z Friday supported by
a light easterly flow at 700mb. This if correct could generate
gusts over 50 miles per hour across the wind prone areas of Davis and Weber
Colorado with gusty easterlies in the Cache Valley. East winds also
develop with the onset of snow in our Wyoming zone late tomorrow and
continue through Friday but not as strong.

Precipitation should pretty much be ending Thursday night as the upper low
splits apart and a new center reforms over central California. Snow may
redevelop late Friday/Friday night as the upper low swings back eastward into
the Great Basin.

No updates planned at this time.


Aviation...south winds are expected to continue through the night
and into Wednesday at the slc terminal. Winds will likely become
gusty between 05 and 07z. Ceilings will remain above 8k feet above ground level through
midday Wednesday.


Slc watches/warnings/advisories...
Utah...Winter Weather Advisory from noon Wednesday to noon MST Thursday
for utz001-002-005>009.

Wyoming...Winter Weather Advisory from noon Wednesday to noon MST Thursday
for wyz021.




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