Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 260336

Area Forecast Discussion
National Weather Service Salt Lake City UT
936 PM MDT Mon Sep 25 2017

.SYNOPSIS...Warmer and drier conditions will exist across the area
through midweek. The next upper low will develop over western
Arizona Tuesday, then turn back to the north and impact much of
southern and eastern Utah during the latter half of the week.


.DISCUSSION...The forecast area remains within a mean longwave
trough position this evening. The upper low which brought
widespread precipitation this past weekend continues to lift
northeast through the northern high plains, and away from the
area, while upstream a more subtle shortwave and associated 100kt
jet streak is quickly digging through the northern
Rockies/interior Pacific Northwest. This upstream feature will
continue south overnight, eventually forming a closed low over the
lower Colorado River valley during the day Tuesday, leaving a mid
level deformation axis across the forecast area with a dry
airmass. As this low eventually lifts northward during the middle
to latter portion of the week, moisture will spread northward into
the forecast area, bringing a chance of showers to the eastern
half of the CWA.

Made some minor tweaks to the forecast grids primarily to remove
lingering PoPs from the Uintas and to adjust cloud cover.
Otherwise going forecast looks in good shape.


.AVIATION...VFR conditions will prevail at KSLC through the TAF
period. Northerly winds are expected to switch back to the south
between 04-05Z.





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