Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 220340

Area Forecast Discussion
National Weather Service Salt Lake City UT
940 PM MDT Fri Jul 21 2017

.SYNOPSIS...Drier air will gradually spread back into the area
from the northwest through Sunday. Moisture will start to spread
back into Utah Sunday night and Monday.


.DISCUSSION...A broad mid level ridge is centered over the srn
half of the UT/NV border this eve and extends e-w from central CA
into the plains. A drying westerly flow north of the high has
persisted thru today bringing drier air into nwrn UT with
dewpoints down into the 30s at Logan and Wendover and into the
lower 40s at SLC during the late aftn.

Deep moisture persisted over ern and srn UT with fairly numerous
slow moving tstms and local heavy rain creating some flash
flooding. The storms have weakened considerably as of mid eve but
there is still a potential for brief heavy rain for a little

With the high not moving much thru Sat the drier airmass will wrap
south thru ern UT and into srn UT over the next 24 hours altho
there should still be enough moisture in these areas for terrain
based convection tomorrow aftn/eve. Do not expect as much of a
threat of heavy rain however and storms should be somewhat more
isolated, except across the far south where the deeper moisture

Similar conditions are expected Sun but the high does start
shifting east and moisture will begin to spread back into the CWA
from the south and west Sun night and Mon. A well defined short
wave lifts north up the west side of the high on Tue into Wed that
should bring more widespread precip along with the threat of heavy
rain to much of the CWA.

Updated earlier to lower pops north and raised them south the rest
of the evening, and kept isolated showers mentioned across the
south overnight. No additional updates planned.


.AVIATION...Winds at the SLC terminal will become southeasterly by
05z and continue overnight into Saturday.





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