Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Salt Lake City Utah
1034 am MST Tuesday Dec 10 2013
Synopsis...high pressure aloft off the West Coast will produce a
stable and mostly dry northwest flow across the Great Basin
through midweek. The high pressure aloft will shift east over
Utah during the latter half of the week.
Discussion...strong high pressure will remain off the West Coast
this morning with a mean cyclonic northwesterly flow aloft over the
eastern Great Basin. This flow will bring in a weak disturbance
which will graze the area today. Otherwise...700mb warm advection
will continue through this evening. Increasing clouds can be
expected over the north with a few light snow showers or flurries
possible near the Idaho border. Otherwise cold temperatures will
remain in place across valley areas today although mountains should
see a warming trend due to the warming aloft.
The ridge will gradually build into the western Continental U.S. Through
midweek. This will keep valley inversions in place with an increase
in haze over the next few days. The next trough to move through the
area is expected to arrive on Friday. Model 700mb temperatures get
as cold as -10 to -11c by Saturday morning. While this is not nearly
cold enough to turn over the inversions given the extent of the cold
air trapped in the valleys...this could at least weaken them a bit.
Otherwise...this system could produce some light snow for the north
but no significant storms are in the picture through the weekend.
Made minor update to adjust maximum temperature grid for today.
Aviation...the slc terminal will see VFR conditions through the
morning with some scattered clouds. Southeast winds are expected to
shift to the northwest between 18z and 20z.
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