Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 272137
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
237 PM PDT FRI MAY 27 2016

.SHORT TERM...Tonight through Monday...An upper low will remain over
British Columbia tonight through Saturday night. The flow on the
south side of the low, and over the Pacific Northwest, will be
westerly through Saturday night. As such will see a persistent, but
weakening onshore surface flow. Breezy to locally conditions will
continue into this evening, then lighten overnight. Winds will be
lighter Saturday. Precip will be limited to some showers near the
Cascade crest and the Cascade east slopes, primarily in Washington,
through Saturday night. Some of these showers may extend into the
Kittitas Valley on Saturday. Elsewhere conditions will remain dry.
High temps will warm 5 to 8 degrees Saturday afternoon versus today.
An upper ridge will begin to build over the eastern Pacific Sunday,
causing the upper low to start shifting north and weakening. A piece
of this low will swing across northern Washington Sunday afternoon
and evening. This disturbance has the chance to cause isolated to
scattered showers over our eastern mountain zones Sunday afternoon
and evening. Thunderstorms may also develop in these areas as well,
with the best chances of storms over Wallowa, Union and eastern
Grant counties in Oregon. Some slop over showers will persist over
the Cascade east slopes Sunday as well. By Monday, the region will
be under a drier northwest flow as the building upper ridge moves
toward the PacNW. Thus will continue the current dry and seasonally
warm forecast. 90

.LONG TERM...Monday night through Friday...A ridge of high pressure
will be over the region throughout the extended period. This will
bring back hot and dry conditions to the forecast area. There are
some model differences in the amplitude of the ridge and the
placement and strength of an upper level trough off the coast by
midweek so forecast confidence begins to decrease.

&&

.AVIATION...00Z Tafs...VFR conditions will prevail through the
forecast period. Expect a few low level CU through this evening then
SCT-BKN high clouds overnight and Saturday. Winds will be sw-nw at
10-20KT except 20-30KT at KDLS and 15-25KT at KPDT this afternoon.
Winds decrease overnight.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  43  71  47  75 /   0  10   0  10
ALW  47  71  52  75 /   0  10   0  10
PSC  47  75  50  80 /   0  10   0  10
YKM  43  74  47  77 /  10  10  10  10
HRI  45  75  48  79 /   0  10   0  10
ELN  45  70  48  70 /  10  20  10  20
RDM  32  70  39  74 /  10  10  10  10
LGD  38  66  42  71 /  10  10  10  30
GCD  36  69  41  74 /  10  10  10  10
DLS  48  74  53  75 /  10  10  10  10

&&

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

$$

90/91/91


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