294
FXUS65 KSLC 211050
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
350 AM MST Fri Feb 21 2025

.SYNOPSIS...Drier conditions will settle into the area today. A weak
disturbance will bring the potential for some light precipitation to
northern Utah late Sunday into early Monday.

&&

.SHORT TERM (THROUGH 12Z SUNDAY)...Utah remains under a near-
northerly cyclonic flow along the backside of the trough that
brought the latest round of weather to the area. The best dynamics
associated with this trough, however, is associated more with a
closed low which is now over central CO. As such, precipitation has
mostly wound down across Utah. The deeper moisture has decreased
over Utah as well, leaving lingering low-level moisture which has
resulted in fog and stratus over and around the spine of Utah and in
southwest Wyoming. The fog has been locally dense, worst near the
Logan Airport, near Willard Bay, and around Hill AFB. At this time,
coverage of dense fog is not enough to warrant any highlights.

One final, diffuse, disturbance embedded along the back edge of the
trough will drop south near the UT/NV border today before carving
out into a more consolidated trough over AZ. Weak dynamics along
with drier air continuing to move in today will result in very
minimal chances for any precipitation. Main impact would be
continued cool northerly flow maintaining below normal temperatures
across most of the area today.

High pressure will quickly build into the area tonight, bringing dry
and stable conditions. However, a shortwave trough trying to push
into this ridge will cross Utah tomorrow afternoon/evening, but weak
dynamics will likely result in little more than increased clouds.
Temperatures will trend warmer tomorrow, but remain slightly below
climatological normals across the northern Utah.


.LONG TERM (After 12Z/5AM MST Sunday)...A relatively quiet pattern
will be in store for the long term period. High pressure will build
into the area on Sunday with near normal temperatures for this time
of year. Far northern Utah will be on the southern periphery of
moisture from a shortwave passing by to the north. This will bring
PoPs up to ~30% for areas near the Idaho border on Sunday evening.
Warm temperatures will keep snow levels well into the mountains with
only a few hundredths of an inch of QPF possible.

A transient ridge will move through on Monday with temperatures
running ~5 degrees warmer than normal across northern Utah and ~10
degrees warmer than normal across southern Utah. Another grazing
trough to the north will bring similar PoPs to the same areas near
the Idaho border that won`t amount to much. A highly amplified ridge
builds into the western CONUS by the middle to end of next week.
This will keep conditions dry with temperatures well above normal (5-
10 degrees). Some of the more aggressive members have temperatures
as warm as 10-15 degrees above normal which would bring portions of
northern Utah into the 60s.

&&

.AVIATION...KSLC...Low level moisture will keep some scattered low
clouds through the morning period resulting in MVFR conditions
transitioning to predominant VFR after sunrise. Some patchy fog has
been noted east of the GSL, but there is only ~20% chance for fog to
impact the terminal. Mountain obscuration will remain a concern
through the morning hours. Conditions will remain dry with winds
light out of the north transitioning to a light southerly ~12Z.

.REST OF UTAH AND SOUTHWEST WYOMING...Low level moisture across the
northern airspace is resulting in fog with reduced CIGs and VIS for
some valleys. Intermittent MVFR/IFR conditions will continue across
the north through mid morning with mountain obscuration. Conditions
will remain dry with CIGs increasing and clouds breaking during the
day. Winds will remain light and variable across the airspace.

&&

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...None.
WY...None.

&&

$$

Cheng/Mahan

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