Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 192209

Area Forecast Discussion
National Weather Service Salt Lake City UT
409 PM MDT Wed Apr 19 2017

.SYNOPSIS...High pressure will shift east of the area tonight. The
next cold front will cross the region Thursday with a cold
northwest flow for Friday.


.SHORT TERM (Thru 00Z Sunday)...A short wave ridge is centered
overhead this aftn with the flow at lower levels beginning to back
around to swly. A few showers and isolated tstorms popped up over
the nrn CWA this aftn in lingering low level moisture and

The ridge axis shifts east tonight ahead of the next Pac trof and
any showers should quickly end by sunset. This is a negative tilt
feature that shears across mainly nrn UT on Thu at the nose of a
strong nwly jet. The associated cold front crosses SLC around noon
and crosses the srn and ern CWA Thu aftn into Thu night. Precip
looks to be showery behind this front with snow levels lowering to
near 7000 feet by the end of the day then to the valley floors
overnight in any lingering orographic showers. These showers
could last into Friday.

Post frontal downslope winds could get strong in the ern and far
srn valleys Thu night into Fri morning with speeds potentially
reaching advisory levels. Ridging moves in for Sat bringing a
warming trend.

.LONG TERM (After 00Z Sunday)...The ridge over the area Saturday
afternoon shifts east Saturday night, as a larger trough pushes
across the Pacific Northwest. Utah and southwest Wyoming look to
be clipped by the southern end of this trough, with the
associated cold front moving across the northern half of the CWA
Sunday afternoon/evening. Have increased POPs a bit through this
period, but precip values are generally expected to be light at
this time, as the best mid/upper level instability stays north
into Idaho and Montana.

Flat shortwave ridging shifts back over the area Monday afternoon,
but the pattern remains fairly progressive, so the break will be
short-lived. The next Pacific trough begins pushing into far
northern Utah on Monday evening/night, but the best instability
looks to hold off until late Tuesday into Wednesday, when the jet
stream begins pushing over the Great Basin from the northwest.

While there are still some discrepancies about the structure of
this next storm this far out, the general idea looks to be an
extended period of moist west-northwest flow through mid-week,
which could yield another fairly wet spring storm across much of
the area. Have increased POPs a fair amount Tuesday and Wednesday,
and lowered temperatures a bit for what could be some fairly
cloudy/wet days.


.AVIATION...North winds at the SLC terminal will shift to the
south between 04-06Z.




SHORT TERM...Wilensky
LONG TERM...Schoening

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