Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 210352

Area Forecast Discussion
National Weather Service Salt Lake City UT
952 PM MDT Sun Aug 20 2017

.SYNOPSIS...Southerly flow aloft early this week will bring an
increase in mid-level moisture, leading to an increase in shower
and thunderstorm chances. Eclipse viewing on Monday will likely
be hampered by clouds in southern Utah.


.DISCUSSION...A closed low remains in place off the southern
California coast this evening while in the southerly flow aloft
upstream of this low, moisture began to increase across southern
Utah. PWATs made it to the 0.8-0.9 inch range across the far south
by late this afternoon. Showers and thunderstorms developed along
the higher terrain today as well some of the southern Utah valleys
where instability was higher. Most of the activity across the north
quickly tapered off with the loss of daytime heating, while across
the south showers and thunderstorms have decreased in intensity. A
few showers are expected to linger through the night across the
south as moisture continues to spread northward.

Similar conditions are expected tomorrow, except with a bit more
coverage of storms across southern and central Utah given the
increase in moisture. Much of northern Utah is expected to remain on
the drier side and less convectively active as a result.

Northern Utah will remain more promising for eclipse viewing
tomorrow compared to southern Utah. Given the convection today and
lingering showers expected overnight, southern Utah will likely be
partly to mostly cloudy with areas of thicker clouds. Northern Utah
is currently seeing little convective debris clouds and most of
these are not expected to persist into tomorrow morning. However, a
band of mid and high clouds is trailing an upper trough currently
crossing the northern Rockies. This band of clouds, evident on
satellite imagery across Oregon and central Idaho, is expected to be
draped across northwest Utah tomorrow morning. However, these clouds
will tend to thin as they continue to approach Utah. By eclipse
time, expect these clouds should be sufficiently patchy and thin to
allow for periods of unobstructed eclipse viewing.


.AVIATION...VFR conditions will continue through the TAF period at
the KSLC terminal. Southeast winds will prevail through the night.





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