Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 281510
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
810 AM PDT WED SEP 28 2016

.SHORT TERM...Today and tonight...Forecast area is between a ridge
of high pressure over the northern Plains and a trough of low
pressure in the eastern Pacific. This places us under a dry
southwest flow with just a few cirrus clouds expected. Today will be
another above normal temperature day with light winds. Just made
minor changes to sky conditions, winds and temperature for today and
tonight in the morning forecast update.


&&

.PREV DISCUSSION... /issued 200 AM PDT WED SEP 28 2016/

SHORT TERM...Today Through Friday...Dry southwest flow will
continue today over WA and OR. There may be a few high clouds in WA.
An upper level low and associated trough in the Gulf of Alaska will
deepen as it shifts southeast today through Friday. This will
increase southwesterly flow over WA and OR and transport moisture
and instability into the CWA Thursday and Friday. Thursday afternoon
and evening a weak disturbance in the southwest flow will move
through central OR to the WA Blue Mountain Foothills. This will
combine with increasing moisture, elevated instability, and daytime
heating to trigger showers over the area. A few thunderstorms are
possible as well. Friday the southwest flow aloft will continue, but
the strongest instability will remain west of the Cascades. There
will be a slight chance of showers along the Cascades and from
central OR to the northeast mountains. Coonfield

LONG TERM...Friday night through Tuesday...Unsettled weather
pattern is in store through the period as a series of three upper
lows/troughs move across the forecast area. This will keep mostly
cloudy conditions with a chance of showers each day. The best chance
for rain will be over Oregon. The models could be underdoing qpf a
bit given the strength of the systems so pops and qpf may need to be
nudged upward in the coming days. Have chosen to leave thunderstorms
out of the forecast for the time being given what is now an
unfavorable climatology. However there is some limited potential for
a storm or two on Saturday afternoon. Temperatures will be cooler
than normal through the period with highs mostly in the 60s lower
elevations and 50s mountains. There could be some snow at night in
the mountains above 5000-5500 feet. 78

AVIATION...12Z TAFS...VFR conditions will prevail through the
forecast period. Just some high cirrus cloudiness is expected today
and tonight. Winds will be 10 kt or less. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  79  51  79  52 /   0   0  20  20
ALW  80  54  81  55 /   0   0  20  20
PSC  81  54  82  53 /   0   0  10  20
YKM  82  48  81  47 /   0   0  10  10
HRI  81  51  81  53 /   0   0  10  20
ELN  80  48  79  46 /   0   0  10  10
RDM  81  43  79  42 /   0   0  20  20
LGD  83  47  82  48 /   0   0  20  20
GCD  86  49  83  45 /   0   0  20  10
DLS  82  54  79  50 /   0   0  10  20

&&

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

$$

91/77/77



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