Sandy, Utah 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

102
FXUS65 KSLC 182128
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
328 PM MDT Sun May 18 2025

.SYNOPSIS...A few showers will linger tonight into Monday, while a
cool airmass will remain in place into Tuesday morning. Thereafter,
the airmass will start to trend drier and much warmer.

&&

.SHORT TERM (THROUGH 12Z TUESDAY)...The axis of the upper trough has
shifted east of Utah this afternoon. Steadier precipitation from
earlier today has mostly wound down across the forecast area,
leaving some scattered showers in its wake. Expect these to also
gradually diminish this evening. A trailing low pressure system is
noted over the PacNW currently. This low is expected to get sheared
out and absorbed into the mean northwesterlies as it heads into Utah
late tonight into tomorrow morning. As the remnant vort lobe moves
into Utah, however, expect some showers to increase again by early
tomorrow morning. These showers should be short-lived and remain
light before the airmass stabilizes behind this disturbance tomorrow
afternoon. Winter Weather Advisories for the mountains remain in
place until 6 PM this evening. With precipitation winding down,
additional accumulations will mostly remain light.

With colder air having settled into the area and reduced cloud cover
expected tonight, overnight min temperatures will run about 5-10
degrees below climatology. This will bring some valley temperatures
to near or below freezing, which could have impacts on early season
vegetation. Affected areas include eastern Box Elder County and the
Cache Valley, the western Uinta Basin, and central and southwest
Utah valleys, mostly in outlying, more rural areas. With cold air
lingering tomorrow, the threat of a freeze continues for the same
areas except eastern Box Elder County and the Cache Valley. Freeze
headlines remain in place with no changes.

.LONG TERM (AFTER 12Z TUESDAY)...High pressure will bring a rapid
warm up, with temperatures averaging around 10 degrees above normal
by Thursday. For most of the state, there is a less than 10% chance
of measurable precipitation between Tuesday and Saturday. By Sunday,
there is a division in ensemble members between a strong ridge
overhead or a weak upper level low undercutting the ridge (and
perhaps bringing light precipitation and lower temperatures).

&&

.AVIATION...KSLC...A 20% chance remains for outflow driven
southeasterly winds (<7 knots) through 00z, otherwise northwesterly
winds are expected to prevail. Coverage of additional showers will
continue to wane, but a 30% chance exists for brief reductions to
MVFR through 03z tonight. Mountain obscuration of local terrain is
expected to persist into Monday.

.REST OF UTAH AND SOUTHWEST WYOMING...Although isolated thunderstorm
potential has shifted east of the area this afternoon, scattered
showers capable of brief MVFR reductions will exist across the north
through 03z tonight, and 00z across the south. Prevailing northerly
winds are expected to dominate, with modestly gusty winds tapering
with sunset this evening. In large, conditions will improve to VFR
for all areas after 03z tonight.

&&

.FIRE WEATHER...Precipitation will wind down this evening across the
area as the trough and associated cold front continues to shift
east of the area. A trailing disturbance is expected to drop into
Utah late tonight into tomorrow morning which should reignite a
few showers, but these should remain generally light. Thereafter,
expect a general warming and drying trend through the end of the
week. However, a series of weak disturbances grazing northern Utah
during this time could bring a few showers to far northern Utah
near the Idaho border, but these will be increasingly high-based
with a potential for gusty outflow winds.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Freeze Warning from 9 PM this evening to 10 AM MDT Monday for
     UTZ103-107-114>116-118-119-122.

     Winter Weather Advisory until 6 PM MDT this evening for
     UTZ110>113-117-125.

     Freeze Watch from Monday evening through Tuesday morning for
     UTZ114>116-118-119-122.

WY...None.
&&

$$

Cheng/Kruse/Merrill

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