Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 201000
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
300 AM PDT Wed Sep 20 2017

.SHORT TERM...Today through Thursday night...KPDT radar and surface
observations indicate rain showers south of a line from White Swan
to Kennewick to Dayton early this morning. The showers are being
triggered by dynamic lift associated with the left exit region of an
upper level 125 mph jet stream around 30000 feet. Upstream a
mid/upper level shortwave offshore of the Washington coast will move
inland and east of the Cascades today and deliver categorical rain
accumulations in the Blue Mountain Foothills and the Blue Mountains.
The shortwave will remain over the region through tonight and
the sweep into Idaho by day break Thursday  for unsettled conditions.
Polan

.LONG TERM...Friday through Wednesday...Models in good agreement
that the persistent cold upper level trough will finally exit the
region towards the end of the week and be replaced by an upper level
ridge of high pressure for the first of next week. What the models
do not agree on is the amplitude and location of the highs ridge
axis during this time. So, will see a few lingering showers mainly
in the eastern mountains Friday and possibly into Saturday before
the ridge begins to build into the region from the west. With the
ridge intensity and position uncertain but known to be in general
over the region there will be a warming trend heading into the
weekend and then remain warm into the first of the week. Overall the
forecast looks dry after the trough exits but the uncertain position
of the ridge will lead to some uncertainty in the temperature
forecast for the first of the week.

&&

.AVIATION...12Z TAFs...Conditions will be mainly VFR, though brief
MVFR CIGs may occur with some moderate rain showers and or
thunderstorms at times. Winds will also increase the winds again
with 10-20 sustained and G25kt mainly 18z-03z at KRDM, KBDN, KDLS,
and KPDT.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  56  42  58  42 /  80  40  20  20
ALW  56  44  60  44 /  80  40  20  20
PSC  59  42  63  43 /  50  20  10  10
YKM  58  39  62  42 /  40  20  20  10
HRI  58  44  61  43 /  70  20  20  10
ELN  59  39  64  41 /  40  20  20  10
RDM  55  30  55  33 /  70  40  20  20
LGD  54  36  53  35 /  90  60  40  30
GCD  55  38  54  37 /  80  60  40  30
DLS  60  45  66  48 /  90  30  20  10

&&

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

$$

99/91/91


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