Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 220427

Area Forecast Discussion
National Weather Service Salt Lake City UT
1027 PM MDT Wed Mar 21 2018

.SYNOPSIS...A moist southwest flow aloft focused on California
will spill into the Great Basin late in the week. A weak
disturbance embedded in this moist southwest flow will cross Utah
Thursday night through early Friday. A second cold upper level
trough off the Pacific Northwest coast will move east across the
region this weekend.


.DISCUSSION...Satellite and radar are showing that the main
moisture plume continues to angle north northeast across central
California then northeast into north central Nevada and southern
Idaho. Some showers have been clipping northern portions of the
CWA, but the brunt of the precipitation is hanging way back in
California which will not arrive in Utah until late Thursday or
Thursday night. In addition, the 500mb heights are forecast to either
hold steady or rise some through tonight, indicating the air mass
is continuing to warm aloft and remain relatively stable. Based
on this and the fact that the latest GFS/NAM/HRRR forecasts are
less bullish with the PoPs, have backed off on PoPs forecast for

Winds are just recently starting to increase over the western
valleys in the past hour. As they do this will keep temperatures
on the mild side so current minimum temperature forecasts look on
track. High winds will be the main concern for western valleys
and mountains for Thursday.


.AVIATION...VFR conditions are expected at the SLC terminal
throughout night. Light and variable winds are expected through
about 06Z then becoming south southeast. Winds are expected to
ramp up with gusts over 30 kt after 11-13Z. Best chance of rain
showers and cigs near 7000ft AGL will be between 12 and 15Z then a
hiatus is likely until late Thursday afternoon or evening.


UT...High Wind Warning from 10 AM to 9 PM MDT Thursday for UTZ003-005-




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