Salt Lake City, Utah 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

463
FXUS65 KSLC 211031
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
431 AM MDT Sat Jun 21 2025

.SYNOPSIS...Strong winds and widespread critical fire weather
conditions will persist today across central and southern Utah,
while a cooler airmass settles into the north. A cold front will
cross the region tonight, bringing cooler temperatures for Sunday
and Monday. A warming trend will follow for the middle to latter
portion of the week.

&&

.SHORT TERM (Through 12Z/6AM Monday)...An anomalously deep upper
trough for the latter portion of June encompasses much of the
Pacific Northwest, northern Rockies and northern Great Basin early
this morning. A dry cold front associated with this trough pushed
through northern Utah overnight, and currently stretches from
roughly Delta to Evanston. To the north of this boundary, much
cooler air has spread across northern Utah/southwest Wyoming, and
will remain in place through the day, resulting in a cooling trend
of 10-15 degrees. To the south of the boundary, another day of dry
and windy conditions is on tap across central and southern Utah.

The cold front will stall early this morning before mixing north a
bit this afternoon. To the south of this front strong
southwesterly flow > 40 KTS at 700mb will mix to the surface,
resulting in another afternoon of wind gusts in the 40-55 mph
range, with a few locally favored spots potentially touching 60
mph across southwest Utah. In addition to widespread Red Flag
Warnings (see Fire Weather Discussion for Fire Wx Details), have
maintained going Wind Advisory for lower elevations of central
and southern Utah through this evening.

A shortwave trough currently making landfall along the northern
California coast will rotate inland, and eject across the northern
Great Basin/Snake River Plain late tonight through early Sunday
morning. This wave will push a re-enforcing shot of cold air into
northern Utah, before allowing the stalled frontal boundary to
accelerate southward through central and southern Utah tonight. A
periods of enhanced northwesterly winds will accompany this
secondary surge of cold air through northern Utah this evening,
then west central and southwest Utah overnight, and could see
winds again reach advisory or even low end warning criteria with
this surge, mainly across northwest and west central Utah...something
to monitor through the day today.

As the upper wave lifts through northern Utah overnight into early
Sunday morning, dynamics look favorable for a band of showers
with this region of forcing. Have made adjustments to increase
PoPs along the Wasatch Front and adjacent terrain overnight. With
colder air quickly advecting into the area, snow levels will fall
to near 7000-7500 feet. Additionally, experimental Lake Effect
Guidance gives a 50-60% chance overnight which is reasonable
considering 700mb temps near -4C and lake surface temps near 24C.
Rain/snow amounts will be light, but it`s been nearly a month
since measurable precip has been recorded at KSLC.

With this colder air spreading into the region, temperatures will
trend another 10F cooler Sunday, and struggle to reach the 70F
mark along the Wasatch Front (normal for KSLC is 87). While not as
pronounced, max temps will trend 5-7F cooler Sunday as this more
stable airmass settles into the region.

.LONG TERM (After 12Z/6AM Monday)...A cooler than normal airmass
will lead to chilly Monday morning lows as temperatures dip down
into the 40s across most valley locations with near freezing
temperatures for areas of the Wasatch Back, Bear River Valley, and
SW Wyoming. A longwave trough across the west is responsible for
the cooler airmass, and a trailing wave will move through on
Tuesday before ejecting to the northeast. This will result in
continued cooler than normal temperatures on Monday and Tuesday
with a small chance of some convection on Tuesday as better
forcing interacts with a bit of moisture. Only 22% of ensemble
members have QPF associated with this passing wave, whereas the
remaining 78% of members keep things a bit too dry to develop any
convection, aside from some rogue high elevation convection.

Towards the middle to end of next week the jet stream pushes to
the north with some troughs moving by to the north. This will
prevent any highly amplified ridging from becoming established
across the west, but conditions will remain dry with a gradual
warming trend. Temperatures by the end of the week climb a few
degrees back above normal, but winds will remain weaker compared
to the past couple of days due to the lack of any substantial
pressure gradient.

&&

.AVIATION...KSLC...VFR conditions will prevail at the KSLC
terminal through the period. Dry and clear skies will continue
with mid level clouds moving in from the west late in the
afternoon/evening. Winds will stay northerly throughout the day,
becoming gusty in the afternoon and evening.

.REST OF UTAH AND SOUTHWEST WYOMING...A dry cold front draped
across the middle of the airspace from southwest to northeast will
keep winds lighter out of the north for the northern half of the
area and gusty out of the southwest across the southern half. VFR
conditions will persist for the entire airspace, aside from KBCE
where wildfire smoke could lower categories briefly.

&&

.FIRE WEATHER...Strong southwesterly flow combined with a very dry
airmass will bring another day of critical fire weather conditions
across most of central, southern and eastern Utah. Meanwhile, a
dry cold front which crossed the area last evening will bring
cooler and more stable conditions across northern Utah today.

To the south of this front, overnight RH recovery has been marginal
to poor across central and southern Utah, and as the inversion
lifts by mid morning RH values will quickly fall below 20 percent
by late morning, and below 15 percent by early afternoon.
Strengthening southwesterly winds will bring gusts of 40 to 50 mph
this afternoon and evening. This front will push south again
this evening, crossing most of central and southern Utah overnight.
As a result, very low RH and strong southwest winds will likely
persist through much of the evening. Once the front passes
overnight, winds will shift to the north to northwest, with gusts
in excess of 40 mph possible within an hour or two of frontal
passage. A cooler airmass will settle across the region Sunday,
however RH will remain very low, and with afternoon wind gusts
from the west to northwest approaching 25 mph at times, fire
weather conditions will remain elevated to near critical across
southern and eastern Utah. Further north, a weak weather system
will bring a chance of showers to northern Utah late tonight into
early Sunday morning.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Red Flag Warning until 10 PM MDT this evening for UTZ482>484-489-
     492>498.

     Wind Advisory from 9 AM this morning to 10 PM MDT this evening
     for UTZ114>116-118>123-126>131.

WY...None.
&&

$$

SHORT TERM...Seaman
LONG TERM...Mahan
AVIATION...Mahan
FIRE WEATHER...Seaman

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