Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 121650

Area Forecast Discussion
National Weather Service Salt Lake City UT
1050 AM MDT Sat Aug 12 2017

.SYNOPSIS...Moisture will remain in place across Utah today. A
drier airmass will start working into the area from the west
Sunday. A cold front will move into northern Utah Monday then
gradually across the state through midweek.


.DISCUSSION...A low amplitude mid level ridge remains centered
over UT this morning. Weak short waves brought isolated convection
to the far nrn CWA and to the southwest so far today. Another
better defined wave is forecast to cross the CWA tonight keeping
convection going overnight.

Moisture is deepest over the south and southeast with PW values
around an inch but amounts of .75-.90 inch are present across the
west as well. The deeper moisture over the south would bring a
threat of heavy rain with storms and that is mentioned in the

Drier westerlies are forecast for tomorrow behind the wave but the
flow quickly backs around to swly again by Mon as a deeper trof
moves into the PacNW states and nrn Rockies. This flow continues
to bring drier air into the CWA and expect a continued downward
trend to the convection.

This trof is fairly deep and is forecast to send a fairly strong
cold front into the nrn CWA late Mon. South winds ahead of this
front could approach advisory levels across the wrn valleys. Much
cooler air behind the front will work south across the CWA on Tue.

Updated forecasts earlier to add pops across the north and far
southwest for the rest of the morning and along the ID border west
of the lake this aftn. No additional changes planned.


.AVIATION...Southeast winds at the KSLC terminal this morning are
expected to switch to the northwest between 1800 UTC and 2000
UTC. Isolated showers and thunderstorms will develop across
northern Utah this afternoon and evening and there is a 20 percent
chance that erratic outflow winds will impact the airport after
2100 UTC.





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