Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 150449

Area Forecast Discussion
National Weather Service Salt Lake City UT
1049 PM MDT Wed Apr 14 2021

Snow showers continue to diminish late this evening over the
northern mountains and southwest Wyoming. Have expired the Winter
Weather Advisories as additional snow accumulations and any
impacts will be minimal overnight.


.SYNOPSIS...A low pressure system will bring cool and unsettled
conditions through the remainder of the week. Drier and warmer
conditions are anticipated over the weekend into early next week.


.SHORT TERM (Through 12Z Saturday)...A broad low is currently
centered over central Nevada and is tracking slowly to the east.
This continued eastward movement has sufficiently weakened the
pressure gradient over northern Utah to limit the threat of
downslope winds. Seeing some isolated 30-40 mph gusts in some of
the most prone areas with weaker winds elsewhere. Earlier
widespread precipitation has become more showery in nature,
limiting associated travel impacts. Still, additional showers are
anticipated through the evening and could see some heavier rates
in the convection so will keep going winter weather headlines in
place for now. Some lightning has been observed with a few showers
along with a bit of small hail in central Utah, but amount of
available energy is dwindling. Over southern Utah, seeing some
gusty winds out ahead of the trough over south central and
southeast Utah with some gusts in excess of 40 mph. Though winds
are marginal for criteria at this time, will keep going wind
advisory in place for that area.

The trough will continue to make its way across the forecast area
through Thursday, keeping northern and central Utah in a
relatively cool and unsettled pattern. Greatest coverage of
showers will be during the afternoon hours with better shortwave
energy and daytime heating. Associated accumulations will be on
the light side, with heavier showers and a few lightning strikes
possible with stronger convection. High temperatures tomorrow are
expected to run 5-10F below seasonal normals.

The main trough is expected to exit by late Thursday but a
trailing wave is expected to follow for Friday. This will bring
another round of showers, primarily during the afternoon over the
higher terrain of northern and central Utah. Some slight warming
is anticipated during the day Friday with temperatures running
close to seasonal normals over southern Utah and up to 5F below
those values over northern Utah.

.LONG TERM (After 12Z Saturday)...The mean pattern of an
upper ridge along the West Coast and a trough across the eastern
U.S. will persist through the long-term period. This pattern leaves
the Great Basin in a generally north to northwest flow on the
eastern side of the aforementioned upper ridge which should provide
mostly dry weather and seasonal temperatures Saturday through the
middle of next week.

An exiting trough will trigger some lingering afternoon and evening
showers Saturday in the higher terrain of southern Utah. Otherwise
expect dry weather for Utah and southwest Wyoming over the weekend
with temperatures rebounding to near seasonal levels on Sunday.

WPC clusters and ensemble means point to at least some chance of
showers from a shortwave that clips southwest Wyoming and the
northeast corner of Utah on Monday. Differences in timing with some
solutions slower and drier and at least one cluster wetter...
average to roughly a slight chance of showers Uintas and northern
Wasatch Monday afternoon and evening. Rest of the state looks dry
with temperatures trending slightly above seasonal readings by
Monday afternoon.

Tuesday looks mostly dry and mild areawide though the slower
solutions of the trough aforementioned on Monday suggest at least a
slight chance of afternoon showers in the Uintas and northern

By Wednesday the EPS mean and EPS dominated clusters show an upper
shortwave trying to close off, centered over western Nevada. GEFS
and Canadian ensembles favor a flatter westerly flow over the Great
Basin with a minor shortwave moving by. The former (EPS) would be
wetter over more of the area while the latter (GEFS and Canadian)
would be drier only favoring showers far north and into the northern
Rockies. Temperatures will be dependent on the eventual winner but
look to be seasonal or slightly above.


VFR conditions will prevail at the SLC terminal through the
evening. Cigs will predominately be at or below 6000 feet AGL with
showers in the vicinity of the terminal. Winds will be largely light
and variable overnight tonight, and will be largely influenced by
any showers in the vicinity of the terminal. That said, winds
should favor a west/northwest component overnight, although there
is a 30% chance winds become light southeast for a period between
08-15Z. However, wind speeds are expected to remain below 8 knots
through about 18Z Thursday, when they will increase out of the




SHORT TERM...Traphagan
LONG TERM...Billingsley

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