Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 260543
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1040 PM PDT Tue Apr 25 2017

.SHORT TERM...next storm to impact the Pacific Northwest is now
moving into the region. Rain is overspreading the forecast area
this evening. Satellite imagery offshore looks fairly impressive
with long fetch of moisture and strong jet. Expect rain to continue
through the night and into Wednesday morning with weak warm advection
pattern. Cascades could see over an inch with northeast Oregon mountains
a half inch. Cold front will then move through later Wednesday. Steady
precipitation will change to showers and westerly winds will increase
with surface high pressure building in. Expect breezy to windy conditions
to continue into Thursday. 94

.AVIATION...06z tafs. Occasional rain tonight into Wednesday morning
with ceilings 030-060. Winds 5-15kt. Rain tapering off Wed afternoon
after cold frontal passage. Ceilings 040-080. Winds increasing to 15-
30kt.

&&

.PREV DISCUSSION... /issued 200 PM PDT Tue Apr 25 2017/

SHORT TERM...Tonight through Friday...An upper level storm system
will move across the region tonight through Wednesday with another
storm moving across the area Thursday as the upper flow transitions
to nwly by the end of the work week. Rain is currently overspreading
western Oregon and the precipitation will move into our forecast
area this evening. There could be a brief break in the rain later
this evening before another round of mostly rain moves in ahead of a
cold front late tonight. The precipitation will be heaviest in
Oregon. A good dose of rain will occur in Oregon and extreme se
Washington on Wednesday ahead of the cold front. QPF amounts could
reach or exceed .5 inches in the mountains. It will become
windy/very windy with the frontal passage. Have issued Wind
Advisories for the Kittitas Valley and Simcoe Highlands for gusty w-
nw winds. It is quite possible that a few more lower elevation zones
will need to be added for wind highlights. Once the front clears the
area Wednesday evening precipitation will become more showery
through Thursday with favored upslope regions of the eastern
mountains receiving the most rain/snow. There could be several
inches of snow for the Northern Blue Mountains above 4000-4500 feet
from Wednesday evening through Thursday night. It is possible that
winter highlights will be needed. By Friday a drier northerly flow
will develop with decreasing chances for showers.  78

LONG TERM...Friday night through Tuesday...High pressure will build
into the region late Friday bringing showers to an end. The ridge
will flatten Saturday night allowing a weather system to impact the
forecast area Sunday with some precipitation and breezy conditions.
Following this system we will be under a northwest flow which will
mainly impact the Washington Cascades and the northern Blue
Mountains with some lingering showers.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  44  57  40  55 /  70  70  20  30
ALW  46  58  43  58 /  70  70  40  40
PSC  47  63  44  62 /  50  40  20  20
YKM  40  63  39  59 /  60  40  10  10
HRI  45  61  43  59 /  60  60  10  20
ELN  42  58  39  54 /  60  40  10  10
RDM  38  54  30  51 /  70  80  10  20
LGD  40  52  37  49 /  80  80  30  40
GCD  35  52  34  50 /  80  90  30  40
DLS  45  59  45  57 /  80  70  20  20

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...Wind Advisory from 11 AM Wednesday to 9 PM PDT Thursday for
     WAZ026-521.

&&

$$

94



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