Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 290959
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
300 AM PDT Mon May 29 2017

.SHORT TERM...Today through Wednesday. High pressure will dominate
the areas weather with mainly dry conditions and above normal
temps today. Afternoon temps are expected to climb into the 90s
across some locations in the basin. As the high pressure slips
east...a return flow of moisture will work its way along the or/wa
cascades tonight where a few showers and an isold tsra is
possible. A low pressure systems pushes toward our area and the
showers and tsra will spread into central oregon and the john day
highlands Tuesday afternoon. Also a cold front is forecast to move
through the region and the tsra should then expand into the
blue/wallowa mountains Tuesday night. With the passage of the
front...breezy west winds could develop in the gorge and spread
into parts of the columbia basin and kittitas valley.

By Wednesday drier conditions can be expected across our western
zones and noticeably cooler temps is forecast. Further east...
showers are expected to linger especially in and near the
blue/wallowa mountains.


.LONG TERM...Wednesday night through Sunday...A broad mid/upper
level trough in the Gulf of Alaska sets the stage for a cyclonic
flow aloft over the forecast area Wednesday night, which will allow a
SW flow to continue over the eastern Oregon mountains for a chance
of showers Wednesday night along with a slight chance of evening
thunderstorms in the Blue Mountains with threat of thunderstorms
ending by sunset. Thursday a mid/upper level shortwave in the
upstream westerly flow makes landfall and sweeps across interior
Pacific Northwest during the day on Thursday, thus keeping a chance
of orographic showers over the eastern Oregon mountains with a
slight chance of thunderstorms in the Blue Mountains during the
afternoon/evening. Thursday night the shortwave exits into Idaho in
the evening resulting in showers tapering off and ending in the
evening. Friday through the weekend flat high pressure will keep
dry conditions in the region.  Polan

&&

.AVIATION...12Z TAFs...Clear skies tonight into Monday morning. Sct
cumulus 060-090 developing in the afternoon mainly over the
mountains. Winds 5-10kt.  Polan

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  89  56  92  54 /   0   0  10  30
ALW  91  61  92  59 /   0   0  10  20
PSC  95  55  97  59 /   0   0  10  30
YKM  94  59  93  57 /   0  10  10  30
HRI  93  54  94  57 /   0   0  10  30
ELN  93  55  87  56 /   0  10  20  40
RDM  89  49  83  42 /   0  20  30  20
LGD  84  47  91  56 /   0   0  10  20
GCD  89  52  92  53 /   0  10  20  20
DLS  95  60  78  56 /   0  10  20  30

&&

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

$$

97/99/99



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