Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 230957
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
257 AM PDT Tue May 23 2017

.SHORT TERM...Today through Thursday. Upper level ridge currently
over the region. Satellite showing clear to partly cloudy skies.
Upper low moving out of the Gulf of Alaska toward the Pacific
northwest along with a strong cold front. This will push the
ridge axis off to the east later today. Expect a mostly sunny and
warm day with highs in the 80s to lower 90s. As the cold front
begins to move into the northwest later today surface gradients
will increase. Westerly winds will increase along the Cascades and
through the gorge by afternoon. The front moves across the forecast
area overnight. Fairly dry airmass so partly cloudy skies for most
locations. Main impact will be gusty west winds and rapidly
falling temperatures. Upper level trough remains over the region
Wednesday with much cooler temperatures. Highs only in the 60s to
lower 70s with continued breezy conditions. A short wave moving
through the upper trough will cross the region Wed night into
Thursday with partly to mostly cloudy skies and scattered showers.
Weak instability may result in a few thunderstorms mainly over
northeast Oregon. Winds will be lighter.  94

.LONG TERM...Thursday Night through Tuesday...Thursday night an
upper trough will be over the forecast area and a wave will moving
through the trough. A slight chance of showers will be present over
the mountains tapering off in the evening. There will also be enough
instability for a slight chance of thunderstorms in the eastern
Oregon mountains in the early evening. Friday and Friday night the
trough will be moving eastward. There will continue to be a slight
chance of showers and afternoon thunderstorms in the eastern Oregon
mountains while the rest of the area remains dry. Saturday through
Tuesday an offshore ridge will build over the area. Saturday through
Sunday should be sunny and warming though an upslope northwesterly
flow may generate a few showers in the the Blue and Wallowa
mountains Sunday afternoon. By Monday the trough will have moved
east with its axis in Idaho. This will give us a more unstable
southwesterly flow aloft and there will be a slight chance of
showers and afternoon thunderstorms in the mountains with the rest
of the area remaining dry. Temperatures Friday will be in the mid
70s to lower 80s with mid 60s to lower 70s in the mountains. As the
ridge moves overhead, highs will be in the 80s with 70s in the
mountains on Saturday. Temperatures will warm a few degrees more
Sunday through Tuesday to the mid 80s to lower 90s with upper 70s to
mid 80s in the mountains. Perry

&&

.AVIATION...Previous discussion...06Z TAFs...VFR conditions will
prevail through the next 24 hours with mostly clear skies except for
a few mid and high clouds. Winds will be light through most of
Tuesday and then will increase...especially in the Gorge and the
Kittitas Valley Tuesday evening to the breezy/windy category ahead
of the mid week cold front. 88

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  88  51  67  43 /   0   0   0  10
ALW  89  53  69  47 /   0   0  10  10
PSC  94  54  74  47 /   0   0   0  10
YKM  92  50  72  45 /   0   0   0  10
HRI  92  54  72  45 /   0   0   0  10
ELN  87  48  64  42 /   0   0   0  10
RDM  90  43  69  34 /   0   0   0   0
LGD  84  48  64  41 /   0   0  10  10
GCD  87  46  67  36 /   0   0   0  10
DLS  89  53  69  47 /   0   0  10  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&

$$

94/83/83



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