Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 230343

Area Forecast Discussion
National Weather Service Salt Lake City UT
943 PM MDT Thu Mar 22 2018

.SYNOPSIS...A cold front will cross the area overnight into Friday
morning. A second cold upper level trough off the Pacific Northwest
coast will move east and impact mainly northern and western Utah and
southwest Wyoming this weekend.


.DISCUSSION...The large-scale pattern this evening consists of an
upper low over the southern BritCol and northern PacNW coast with
southwesterly flow aloft in place over Utah. Meanwhile, the moisture
plume associated with an atmospheric river is shifting east across
Utah with a bit of a dry slot noted on satellite imagery now moving
into the far southwest and west-central Utah at this time. This is
occurring as a weak shortwave disturbance that rippled through the
area lifts northeast into Wyoming. Another shortwave disturbance
upstream will cross the area late tonight into tomorrow morning. As
it does so, the 700mb baroclinic zone currently over far northwest
Utah will shift southeast across the area.

Precipitation decreased across much of the Wasatch Front and west-
central and southwest Utah this evening, and is not expected to fill
in significantly again until the front moves through later tonight.
As such, have updated the forecast to lower PoPs in these areas for
the rest of the evening. Falling snow levels behind the front will
lead to greater accumulating snow for the mountains, as snow levels
have so far been generally above 9000ft.

Otherwise, southerly winds will remain on the high side until the
front moves through. While they have decoupled somewhat and gusts
have weakened from earlier readings, gusts of 40-50 mph and locally
up to 55 mph will remain common the next few hours, especially over
the Salt Lake and Tooele Valleys and the salt flats. As a result,
have extended the High Wind Warning until midnight for these areas.

Precipitation will wind down fairly quickly by late tomorrow morning.


.AVIATION...Gusty south winds will continue at the SLC terminal late
into the evening. A cold front is expected to cross the terminal
between 06-07Z, with winds shifting to the northwest and decreasing.
Winds may then return to the southeast by 12Z. Moderate to heavy
rain is expected with the front, which will likely bring periodic
MVFR conditions to the terminal between 07-14Z.


UT...Winter Weather Advisory until noon MDT Friday for UTZ007-008.

     High Wind Warning until midnight MDT tonight for UTZ003-005.




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