Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 242106
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
206 PM PDT Sun Sep 24 2017

.SHORT TERM...Tonight through Wednesday. Upper ridge over the
area today although high level clouds are starting to increase
ahead of the next offshore system. This system will move through
overnight and Monday with mostly cloudy skies. Much of the
cloudiness will be mid and high level. Any precipitation will be
confined to just light rain showers over the Cascades. By Tuesday
the upper ridge will strengthen over the Pacific northwest and
remain in place through Wednesday. This will bring clear to partly
cloudy skies and warmer temperatures. High temps Monday in the
60s to lower 70s then warming into the 70s to near 80 Tue/Wed.
Winds will remain fairly light through the period mostly in the
5-10 mph range. 94

.LONG TERM...Wednesday night through Sunday...An upper level
ridge will move over eastern WA and OR Wednesday night. Strong
radiational cooling will occur Wednesday night under clear skies and
light winds...especially in mountain valleys including Seneca
Meacham and Ukiah. As the ridge axis moves east of the CWA Thursday
night or Friday southwest flow aloft will bring increasing moisture
to eastern WA and OR. A weak front will move through Canada Friday
night. Since the dynamic lift will remain in Canada the main effects
will be increased cloud cover and a slight chance for rain showers
along the East Slopes of the Washington Cascades. Both the GFS and
ECMWF 12Z models rebuild the upper level ridge behind the
front...but previous runs have varied solutions and GFS ensembles
have a mixture of troughs...ridges...and zonal flow. This
variability provides low confidence in any solution so I based
forecast for Saturday and Sunday on a more zonal pattern from
SuperBlend and CONSALL models rather than operational models.
Coonfield

&&

.AVIATION...00z TAFS...VFR conditions will prevail through the
period. There will be intermittent mid and high level clouds moving
across the region from north to south over the next 24 hours. These
will be mainly above 8K FT AGL. Winds will remain generally under 12
kts through the period. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  43  70  48  73 /   0  10  10   0
ALW  47  71  51  74 /   0  10  10   0
PSC  46  72  50  77 /   0  10  10   0
YKM  46  71  48  76 /   0  10  10   0
HRI  45  72  50  78 /   0  10  10   0
ELN  45  69  46  75 /   0  10  10   0
RDM  37  69  41  73 /   0  10  10   0
LGD  37  66  42  70 /   0  10  10   0
GCD  36  66  40  73 /   0  10  10   0
DLS  49  73  52  79 /   0  10  10   0

&&

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

$$

94/76/76



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