Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 262149
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
249 PM PDT THU MAY 26 2016

.Short Term...Tonight through Sunday...A mostly dry cold front
associated with an upper level low over British Columbia continues
to move across the region this afternoon. Precip with this front
will be limited to a few showers over Wallowa county and along the
Cascade east slopes. Winds are breezy to windy in the Gorge, and
across the Columbia Basin and it`s adjacent valleys. Local very
windy conditions will continue to be possible into early evening,
especially in the Gorge. Thus will continue the current advisory in
the Gorge. The upper low will linger over British Columbia Friday
through Sunday. As such will see a persistent westerly onshore flow
through this period. Winds will be breezy to windy again Friday and
Friday evening. Winds will be lighter over the weekend. Generally
can expect dry conditions across the area due to the west flow.
There will be some showers at times near the Cascade crest and into
the Cascade east slopes, as well as over our northeastern mountain
zones. A wave in the flow on Sunday may cause isolated to scattered
showers over our eastern zones as well as near the Cascade crest.
Also a slight chance of thunderstorms may be possible over Union and
Wallowa counties Sunday afternoon due to this wave. 90

.Long Term...Sunday night through Thursday...Models in fair
agreement on upper ridge building across the region beginning Monday
which a chance for an intrusion of moisture from the south by
Thursday. GFS has an upper level low pressure area scooting by
across northern WA and ID panhandle Sunday night and Monday. Will
keep a small chance for thunder in Wallowa County Sunday night and
small chance for showers along the Central WA Cascades. This will
also keep breezes going in the Kittitas valley. With the upper level
ridge, we will see above normal temperatures return for Tuesday
through Thursday. The warm temperatures aloft combined with short
nights will lead to poor humidity recovery overnight on the ridges
which may be a concern for land managers. Both GFS/EC models agree
on increasing moisture by Thursday so have put in a chance for
thunderstorms over mainly the mountains.

&&

.Aviation...Previous Discussion...18z TAFs...Westerly winds
increasing becoming 15-30kt. Strongest winds likely at KDLS and
KPDT. Weak instability with cumulus developing at 040-070. Otherwise
upper low moving into the Pac NW with sct-bkn 200.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  45  66  43  71 /  10  10  10  10
ALW  49  66  46  71 /  10  10  10  10
PSC  49  73  46  74 /  10  10   0  10
YKM  40  70  42  74 /  10  10  10  10
HRI  48  70  44  74 /  10   0  10  10
ELN  45  64  44  71 /  10  10  10  10
RDM  34  64  32  70 /  10  10  10  10
LGD  41  61  36  66 /  10  10  10  10
GCD  39  63  37  70 /  10  10  10  10
DLS  49  66  47  75 /  10  10  10  10

&&

.PDT Watches/Warnings/Advisories...
OR...Wind Advisory until 8 PM PDT this evening for ORZ041.

WA...Wind Advisory until 8 PM PDT this evening for WAZ024.

&&

$$

90/79/79


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