Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 261657
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
955 AM PDT MON SEP 26 2016

.UPDATE...
A high pressure ridge axis will push east of the region today. A
very dry air mass will result in mainly sunny skies...with very
warm high temperatures in the upper 80s to around 90 for the
lower elevations with upper 70s/lower 80s mountains. No significant
changes to the near term forecast planned.

&&

.AVIATION...18z TAFS. Mainly clear skies for the next 24 hours
with scattered thin cirrus at times. Winds 5-10kt.  94

&&

.PREV DISCUSSION... /issued 400 AM PDT MON SEP 26 2016/

SHORT TERM...Today through Wednesday Night...An upper level ridge
over the region early this morning will gradually shift east during
this period. This eastward shift will be due to weak disturbances
moving into and over the ridge. The air mass over the region will be
dry with generally sunny skies today. High temps today will be above
seasonal and should be the warmest of the week. The strongest of the
systems moving into the ridge will swing through western Washington
and into British Columbia late tonight and Tuesday. As such will see
some clouds over south-central Washington with a slight chance of
light rain near the Cascade crest late tonight and Tuesday.
Elsewhere conditions will remain fair, though winds will increase
Tuesday afternoon and evening, especially in the Gorge and the
Kittitas Valley. Generally fair and dry conditions will continue
into Wednesday and Wednesday night despite an increasing southwest
flow aloft. Temps will remain above seasonal Tuesday and Wednesday,
though these days will be a bit cooler than today. 90

LONG TERM...Thursday through Sunday...An offshore upper level
trough will deepen Thursday and Friday. This will increase southerly
flow over WA and OR and transport moisture and instability into the
CWA. Thursday there will be a slight chance of showers from central
to northeast OR and along the Cascades as a weak disturbance in the
southerly flow moves through eastern WA and OR. Friday and Saturday
the trough will shift east. This will bring higher pops and cooler
temperatures to WA and OR next weekend. Friday a stronger
disturbance will move through WA and OR. There may be enough
instability ahead of the trough to trigger a few thunderstorms
Friday afternoon/evening. Broad troughing will keep some showers in
the CWA Saturday. The trough axis will move east across eastern WA
and OR Sunday with another round of showers. There is some
uncertainty in timing Saturday and Sunday with the ECMWF indicating
slower movement of the trough...but either solution would indicate
showers. Coonfield

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  88  57  82  50 /   0   0   0   0
ALW  89  62  83  55 /   0   0   0   0
PSC  88  57  85  50 /   0   0   0   0
YKM  88  54  83  46 /   0   0   0   0
HRI  88  56  84  49 /   0   0   0   0
ELN  86  55  78  47 /   0   0   0   0
RDM  91  48  82  42 /   0   0   0   0
LGD  85  50  81  46 /   0   0   0   0
GCD  88  49  84  45 /   0   0   0   0
DLS  90  59  82  51 /   0   0   0   0

&&

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

$$

80/94/82


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