Area Forecast Discussion
Issued by NWS Salt Lake City, UT
FXUS65 KSLC 271612
Area Forecast Discussion
National Weather Service Salt Lake City UT
1012 AM MDT Mon Mar 27 2017
.SYNOPSIS...An upper trough will cross the region today through
Tuesday. A second storm is expected late Thursday into Saturday.
.DISCUSSION...The upper trof is centered to our west this
morning with precip becoming widespread across much of the CWA
under the lift on the front side of this trof.
The trof is deepening swd and is forecast to end up forming a
closed low over the central UT/AZ border. The surface front is
just crossing SLC at this time and is forecast to be crossing ern
UT this aftn. Precip will persist along and west of this front and
should last well into tonight. It will tend to become limited to
areas favored by low level nwly flow overnight and will taper off
on Tue as the upper low moves away to the east.
Snow levels are around 7000 ft and will lower to around 6000 ft or
so behind the front but any impacts will be limited to areas above
8000 ft today. This will change tonight as the airmass continues
to cool and snow levels lower to near the valley floors. Any
impact tonight however should still be limited to areas around
6000 ft and higher, but this could involve the passes along I-15
as well as the Wasatch Back and swrn WY. Current Winter Weather
Advisory is on track and will consider expanding it into these
other areas for tonight with the aftn forecasts.
Expect a break in the weather on Wed with temps warming back up.
The 00Z EC and 06Z GFS are now are in very close agreement on the
evolution of the next trof with the GFS fully going to the earlier
EC solution. Both now show the closed low centered over wrn NV at
00z Fri with the cold front on the wrn UT border and the low dives
south overnight with the cold air following, staying west of nrn
For now, updated forecasts earlier to raise morning pops for areas
n and w of SLC as well as srn UT. Left the aftn pops unchanged. No
additional updates planned.
.AVIATION...Northwest winds should prevail at the SLC terminal
through today, though winds could be briefly gusty and erratic near
some showers. Ceilings will remain below 7000 feet through most of
the day, and MVFR conditions will be possible under the heavier
UT...Winter Weather Advisory until 10 AM MDT Tuesday for UTZ008>010-
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