Area Forecast Discussion
Issued by NWS Pendleton, OR

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713
FXUS66 KPDT 271001
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
300 AM PDT TUE SEP 27 2016

.SHORT TERM...Today through Thursday...A weakening Pacific
disturbance will continue to move into and over the upper level
ridge over the western U.S. today. This disturbance will have a
limited impact on the weather conditions across the Pacific
Northwest through tonight. Will see a few mid and high level clouds
drift across the area today and tonight. Any precip will be limited
to Cascade crest area in extreme western Kittitas county in central
Washington. Will see some increased west and northwest winds with
the strongest winds occurring in the Gorge and the Kittitas valley.
High temps will continue to run 5 to 10 degrees above seasonal,
though a bit cooler than yesterday due to the increasing onshore
flow. An upper level trough is still expected to develop over the
Gulf of Alaska Wednesday and then sink southeast towards the PACNW
Wednesday night and Thursday. This will cause the flow aloft to
shift from west-southwesterly Wednesday to southwesterly Thursday.
Initially moisture will be limited and expect fair and dry
conditions Wednesday. Temps will cool some between the Blue
mountains and the Cascade crest Wednesday, but will continue warm
(similar to today) south and east of the Blues. Cooling will begin
to shift into these areas Thursday due to increased moisture and
cloud cover. There should be enough instability for the development
of a few showers Thursday afternoon over the Blue and Wallowa
mountains. At this time instability looks too weak for any
thunderstorms in these areas. 90

.LONG TERM...Thursday night through Monday...An offshore upper level
trough will deepen Thursday night and Friday. This will increase
southerly flow over WA and OR and transport moisture and instability
into the CWA. Friday and Saturday the trough will shift east. This
will bring higher pops and cooler temperatures to WA and OR next
weekend. A series of disturbances will rotate through the trough
bringing showers...cooler temperatures...and lowering snow levels to
5-6 kft Saturday night through Monday. Coonfield

&&

.AVIATION...12Z TAFs...Mostly clear skies this morning.
Increasing mid/high level clouds this afternoon as a weak frontal
boundary moves through the area. Light winds this morning increasing
to  7-15 kts  after 18Z. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  84  49  80  50 /   0   0   0   0
ALW  85  55  80  57 /   0   0   0   0
PSC  86  50  81  50 /   0   0   0   0
YKM  84  47  81  46 /   0   0   0   0
HRI  85  49  81  49 /   0   0   0   0
ELN  80  46  80  47 /   0   0   0   0
RDM  83  40  81  41 /   0   0   0   0
LGD  85  44  82  47 /   0   0   0   0
GCD  86  45  84  46 /   0   0   0   0
DLS  81  52  81  52 /   0   0   0   0

&&

.PDT Watches/Warnings/Advisories...
OR...None.
WA...None.
&&

$$

90/76/76



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