Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 181712

Area Forecast Discussion
National Weather Service Salt Lake City UT
1012 AM MST Sat Feb 18 2017

.SYNOPSIS...The upper level trough along the California coast
will work slowly east across the Desert Southwest and Great Basin
through the weekend. High pressure aloft will return early next
week, followed by a stronger and colder storm system for midweek.


.DISCUSSION...The forecast area remains under a rather moist
southerly flow this morning out ahead of the splitting trough
moving onshore along the California coast. PWs across Utah and
southwest Wyoming are mostly in the 0.5 to 0.6 inch range, which
is near the maximum observed this time of year. Despite all of
this moisture, dynamics are less than impressive, so associated
precip has been generally light.

The California trough will continue east, moving across the Desert
Southwest this evening through Sunday, bringing a frontal boundary
through the forecast area. This will increase coverage and
intensity of precipitation and lower snow levels a bit (from
around 7,000 feet to 5,500-6,000 feet by tomorrow afternoon).
Still, travel impacts will be primarily confined to higher
elevation routes.

High pressure is expected to build behind the exiting system for
Monday. However, some precip is expected to linger over northern
Utah during the day Monday with warm advection developing. A
stronger and colder system is then expected to follow for the
midweek period.

No updates expected to the forecast this morning.


.AVIATION...There is a 40 percent chance of rain showers at the SLC
terminal today, which could briefly bring ceilings below 7000 feet.
While winds will likely remain from the south through the day, there
is a slight chance of winds switching to the northwest between 19Z
and 22Z.





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