Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 181525

Area Forecast Discussion
National Weather Service Salt Lake City UT
925 AM MDT Tue Jul 18 2017

.SYNOPSIS...Drier will move into northern Utah today. Monsoon
moisture will spread into the area Wednesday and Thursday and may
bring the potential for heavy rain to central and southern Utah.


.DISCUSSION...Some clouds were lingering over central, southern
and eastern portions of the CWA early this morning but latest
satellite imagery shows clouds have dissipated rapidly in the past
hour or two. The few weak radar echoes over the southern mountains
have also vanished. Therefore have improved the sky cover and
reduced the threat of showers and thunderstorms through noon.

Across southern Utah the PWs remain near 1 inch with about
1.2 inches in Washington County. With little transport winds,
thunderstorms that develop over the mountains this afternoon will
be slow moving and this will increase the chance for possible
flash flooding. Have added locally heavy rain to the southern tier
counties for this afternoon.

One concern for late this afternoon and evening is the
increase of instability over west central Utah where the mixed
layer CAPE is forecast to exceed 500 and the MLCIN vanishes. The
PWs are forecast to increase late and current GOES 16 lower lever
WV shows a finger of moisture pointing in this direction. Will
evaluate for afternoon package.


.AVIATION...Winds at the SLC terminal are expected to switch from
southeast to the northwest around 19-20Z today. VFR conditions
will prevail through the day under mostly clear skies.





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