Area Forecast Discussion
Issued by NWS Salt Lake City, UT
FXUS65 KSLC 210320
Area Forecast Discussion
National Weather Service Salt Lake City UT
920 PM MDT Thu Apr 20 2017
.SYNOPSIS...An upper level trough will move east of Utah tonight.
A cool northwest flow Friday will be replaced by high pressure on
Saturday bringing a warming trend.
.DISCUSSION...The axis of the cool upper trof is over wrn UT
this eve with scattered convective showers developing east of the
axis and crossing the nrn and central CWA. These will fall as
snow above about 6000 ft and could bring brief accumulation on the
passes thru the nrn and central mtns. Expect this to melt quickly
once the snow showers move past.
The trof axis moves east after 06z and the showers should diminish
but expect enough moisture and low level instability will persist
to keep a few going into Fri morning.
A fairly tight surface gradient and modest upper support will
bring locally strong gusty northwest winds to downslope areas in
ern and swrn UT tonight into Fri morning. Speeds for the most part
look to stay just under advisory levels but gusts in the most
favored spots such as Fremont Junction and Hogan Pass could hit
60 or better. So existing advisory will remain in effect.
Showers should pretty much end Fri aftn with skies clearing Fri
night. The cool airmass in place could allow temps to touch hard
freeze criteria in the colder spots Sat morning. Strong warming
and the low level flow backing around to light southerly by Sat
afternoon should send temps back to near or a little above normal.
Swly flow increases Sun ahead of the first of a series of low
amplitude but increasingly moist short waves forecast for next
GFS is slower and deeper with this first wave than the EC with a
stronger cold front for Sun eve and a chance of rain with the
front. The fast moving waves keep a threat of precip going over
the north each day thru the rest of the week with it occasionally
reaching into srn UT.
No updates planned at this time.
.AVIATION...Periods of MVFR in passing rain showers will continue
at the SLC terminal through about 05-06z with a chance this lasts
until 11-12z. Outside of the showers CIGS will stay at or below
6000 ft until after 12-13z. Winds will be mostly northwest through
the night and into Friday with occasional gusts through about 06z.
Winds could become light and variable for a time between about
UT...Wind Advisory until 11 AM MDT Friday for UTZ012-013.
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