Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 210406

Area Forecast Discussion
National Weather Service Salt Lake City UT
1006 PM MDT Fri Oct 20 2017

.SYNOPSIS...The strong cold front that passed through Utah today
will exit the four corners region by late this evening. Cold air
behind the front will remain over the area Saturday, followed by
significantly warmer temperatures Sunday. A weak disturbance will
bring cooler air back to the north Monday, followed by a warming
trend as high pressure aloft returns to the region.


.SHORT TERM (until 00Z Tuesday)...The strong cold front that raced
through the state today will exit through the four corners region
by around midnight tonight. Lingering showers along the Arizona
border and across far eastern Utah will follow the front out of
the state over the next couple of hours. The substantially colder
air behind the front will bring lows tonight and highs Saturday
down about 10-20 degrees from today`s readings.

The upper trough that brought the colder temps to Utah will cross
northern Utah overnight. Can not rule out a few showers developing
again near the Idaho border as trough with it`s associated mid-
level cold air cross the area.

Warming aloft on Sunday will allow temps to bounce back from  he
cold Saturday readings. A shortwave moving east across the
northern Rockies will create another push of shallow cold
advection into northern/central Utah Sunday night/Monday. Not
anticipating any precip with this feature, though cool a few
degrees with this next push of cooler air.

.PREVIOUS LONG TERM (After 00Z Tuesday)...Mid level ridging will
remain centered to the west of the forecast area throughout the
long term period, resulting in a northwest flow aloft across the
Intermountain Region. Initially this ridge will be centered along
the west coast maintaining dry and mild conditions inland across
the eastern Great Basin. However, by midweek this ridge is
forecast to retrograde offshore, allowing a potent but fast moving
shortwave trough to dig through the forecast area Wednesday night
into Thursday. Have increased PoPs for this period across the
north, as well as lowered temperatures for the end of the week.


.AVIATION...The lingering showers that trailed today`s cold front
have end in vicinity of the terminal this evening. VFR conditions
will prevail overnight through Saturday with brief periods of
scattered to broken cloud cover based near 10 kft. Light northwest
winds this evening will gradually work around to the southeast
around 08z to 09z, then return tho the northwest late Saturday





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