Sisters, Oregon Weather Forecast Discussion

105
FXUS66 KPDT 182054
AFDPDT
Area Forecast Discussion
National Weather Service Pendleton OR
154 PM PDT Thu Sep 18 2025
.DISCUSSION...Dry conditions across the region today as a weak,
dry upper shortwave moves across the northern portions of the
PacNW. A slight increase in the cross Cascade pressure gradient
has also resulted in locally breezy conditions developing through
the Cascade gaps of Washington, and will continue through this
evening. Otherwise, mostly clear skies prevail, though smoke from
area wild fires are beginning to spread south and east with the
upper shortwave trough.
Tonight through Saturday Morning: Dry conditions with light winds
will prevail into early this weekend as a transient ridge of high
pressure pushes in behind the shortwave exit tonight into early
Friday morning. The upper ridge will also promote a slight warming
trend tomorrow, with temperatures rising back into the mid to
upper 80s in the lower elevations Friday and lingering into
Saturday.
Saturday Afternoon through Sunday Night: The upper ridge over the
area will be pushed east into the northern Rockies by Saturday
evening as a leading cold front and upper level trough dig
southeast out of the Gulf of Alaska. The cross Cascade pressure
gradient will begin to tighten again by late Saturday afternoon,
resulting in breezy to locally breezy west winds developing
through the Cascade gaps and into portions of the Columbia Basin.
While chances will generally be low (

NWS PDT Office Area Forecast Discussion