Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 200408

Area Forecast Discussion
National Weather Service Salt Lake City UT
1008 PM MDT Wed Jul 19 2017

.SYNOPSIS...Monsoon moisture will persist over most of Utah
through Thursday. Drier air will spread back into the area from
the northwest Friday into Saturday.


.DISCUSSION...Upper level ridge remains centered over the
southern plains resulting in southerly flow aloft into Utah. This
has allowed deep monsoon moisture to move north into the state
with precipitable water values near 1.5" in far southwest Utah and
around an inch along the Wasatch Front. Remnant mesoscale
convective vortex still circulating in southern Nevada.

Instability diminished rapidly this evening across the state and
the coverage of convection followed in parallel. Cancelled the
Flash Flood Watch with this update as threat for decent coverage
of storms capable of producing significant precipitation rates
has diminished. However, have left mention of isolated showers and
thunderstorms in forecast tonight for all but far northwest Utah.
A zone of weak mid-level convergence stretching from west central
Utah through the southern Wasatch Front and into the Uinta Basin
is forecast to persist through the night and this could generate
some additional showers. Also, as the remnant mesoscale
convective vortex in Nevada drifts south it could generate
additional showers that could impact southwest and south central

Another night of above normal temperatures is in store for most
of the state as the warm and moist airmass remains in place.


.AVIATION...Southerly winds at the SLC terminal are expected to
prevail overnight and will be gusty at times until about 04-05z.
There is a chance that passing showers could bring additional
brief gusty erratic winds after about 05z through 12z Thursday
morning. Any cigs will remain abv 7000 ft.








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