Area Forecast Discussion
Issued by NWS Salt Lake City, UT
FXUS65 KSLC 241202
Area Forecast Discussion
National Weather Service Salt Lake City UT
502 AM MST Fri Feb 24 2017
.SYNOPSIS...A cold upper trough over the area this morning will
shift east this afternoon. The next system will cross the area
Saturday afternoon and night, with yet another cold storm on tap
for the first part of next week.
.SHORT TERM (Thru 12Z Monday)...The western portion of the cold
upper trof remains over UT early this morning with a cold moist
and unstable west-northwest flow in place.
Snow showers continue early this morning up and down the I-15
corridor as well as over the mtns from east of Cedar City nwd.
Expect these to persist into late morning then begin to dissipate
as the upstream short wave ridge begins to move in with rising
heights and an increasingly stable airmass spreading in thru the
aftn. The airmass is cold and snow will stick to roads thru about
mid morning before they start to run wet. Existing winter weather
highlights will remain in place.
The short wave ridge only brings a brief break tonight into Sat
morning before the next shearing positive tilt trof sags south
thru the area. This brings a threat of light snow first to the
north Sat aftn then shifting swd Sat night lingering across far
srn UT on Sun. Don`t expect much accumulation anywhere but local
travel impacts could still occur overnight as the airmass is cold
and snow will stick to roads again. Precip should stay as rain
below about 3500 ft down south. The flow begins to back around to
swly and warms somewhat Sun night ahead of the next cold trof.
.LONG TERM (After 12Z Monday)...The next trough pushes into the
CWA in earnest through the day Monday, with the best chance of
valley precipitation from 12Z Monday through 00Z Tuesday. Low
level cold advection continues into Monday night, with 700mb temps
dropping to near -16C at the Utah/Idaho border. Combined with
lingering moisture and persistent westerly flow, snowfall will
likely continue in the mountains through much of Tuesday.
The trough exits the area late Tuesday, leading to a significant
drying trend heading into Wednesday. The ridge that follows looks
to be fairly flat, with the ridge axis well west of Utah,
creating a relatively stable northwesterly flow over the CWA
through at least Thursday. This flat ridge makes the warming trend
relatively slow at first, though it could accelerate heading into
Friday as a shortwave off the Pacific shifts the ridge axis
eastward. Bottom line, the latter half of the upcoming work week
looks to be fairly quiet weather-wise, with temperatures
eventually rising to near average for early March.
.AVIATION...Snow showers across northern Utah will likely bring
periodic MVFR/IFR conditions to the SLC terminal today, with
showers generally dissipating around 00Z. Winds may be light and
variable at times through 16Z, but should eventually increase
from the northwest through the day.
UT...Winter Weather Advisory until 4 PM MST this afternoon for
Winter Weather Advisory until noon MST today for UTZ001>003-006.
WY...Winter Weather Advisory until noon MST today for WYZ021.
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