Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 210249

Area Forecast Discussion
National Weather Service Salt Lake City UT
849 PM MDT Mon Mar 20 2017

.SYNOPSIS...A series of weak weather disturbances embedded in the
southwest flow aloft will impact Utah and southwest Wyoming through
Tuesday. A series of storm systems will impact the forecast area
beginning midweek.


.DISCUSSION...The forecast area is under a warm southwest flow
this evening ahead of a broad storm system off the Pacific coast.
Weak shortwaves ejecting out ahead of this system have allowed for
enough instability for a few showers and thunderstorms over the
area. Best coverage of storms over the past few hours has been
over the mountains of northern Utah (primarily south of I-80) and
the adjacent Utah valley. Additional storms are persisting in the
vicinity of Lake Powell, but overall coverage is rapidly
diminishing with the loss of daytime heating. Updated the forecast
earlier to adjust POPs with going trends. No additional updates

Utah and southwest Wyoming will see one more day of near record
temperatures tomorrow with maxes again running 15-20F above
seasonal normals as southerly flow continues to increase with the
approaching storm system. Additional shortwave energy will allow
for a few more showers to develop, primarily over the higher
terrain of northern Utah. Coverage is progged to increase over
northwest Utah Tuesday night/early Wednesday as the initial
frontal boundary moves into the state.

The main storm system is then expected to track across the
forecast area Wednesday into Thursday, resulting in good coverage
of precip and temperatures dropping to or below seasonal normals
by Thursday. Snow levels are expected to remain on the high side
through Wednesday (above 9,000 feet) but 700 mb temps in the -4C
to -6C range by Thursday afternoon could drop snow levels as low
as 5,000 feet.

Ridging is expected to move in briefly behind the exiting storm
system, but another system should quickly follow for late Saturday
into Sunday. The active pattern is then expected to continue into
at least early next week.


.AVIATION...The SLC terminal will see VFR conditions through the
evening with some high clouds. Southeast winds should continue
through the night.





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