Scientific Forecaster Discussion
fxus65 kslc 142252
Area forecast discussion
National Weather Service Salt Lake City Utah
352 PM MST Fri Dec 14 2018
Synopsis...high pressure will shift east ahead of a weakening
weather disturbance that will graze northern Utah tonight. High
pressure will rebound over the area this weekend before another
weakening storm system arrives early next week.
Discussion...the doldrums of the mid-December weather pattern
look to continue for the next seven days or so. Upper level
ridging remains in place across the Great Basin/Rocky Mountain
region this afternoon. A weakening shortwave is crossing into the
Pacific coast. Regional radar mosaics show a band of
precipitation associated with previously mentioned shortwave
crossing northern California and southwestern Oregon.
This shortwave will bring the threat of spotty precipitation to
portions of Utah tonight into early Saturday. There is little
threat of accumulating precipitation for a large portion of the
County Warning Area.
In the wake of this system, a few weak waves will ripple through
the northern intermountain region over the weekend with little to
no impact across Utah. Upper level ridging will gradually build
eastward with rising heights...warming mid-level temperatures and
thus increasing valley inversions, particularly across northern
Hazy conditions have noticeably increased through the day
today...and should continue to gradually increase over the
weekend. A weakening, splitting system may bring another round of
very light precipitation to Utah Monday.
At this point, significant...strong upper level ridging will build
into the western United States. Inversions will strengthen midweek
and into the end of the week.
Aviation...VFR conditions will prevail tonight and Saturday at kslc. Light,
diurnally controlled winds will prevail, with winds becoming
southeast around 03z tonight, and then back to the northwest around
20z Saturday. Speeds will remain less than 8kts. Otherwise, a weak
disturbance passing by overnight will lower ceilings to around 7-8kft,
but ceilings are expected to remain above crest level.
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