Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 282123
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
223 PM PDT Wed Jun 28 2017

.SHORT TERM...Tonight through Saturday...The forecast area remains
between an offshore ridge and a trough centered in Alberta. This is
keeping a dry northwesterly flow over the area. Some of the models
show a few thunderstorms this afternoon and early evening over the
Wallowa Mountains and far southeastern Wallowa County. Webcams show
some cumulus building over the Wallowa Mountains so have kept
isolated thunderstorms there though I am expecting that it will
remain out of the Wallowa Valley. Satellite imagery shows a wave
heading south through the trough and nearing the British Columbia-
Washington border. Models are suggesting that during this evening
the wave will brush the eastern portion of the area and a
thunderstorm or two may be possible in the early evening and showers
later in the evening around Dayton and in the northern Blue
Mountains. Have isolated showers and thunderstorms there. Do not
expect any storms will get into Walla Walla. Breezy winds of 10 to
20 mph with 20 to 30 mph in the Columbia Gorge and the Kittitas
Valley will continue into this evening. Winds will decrease
overnight. Lows tonight will be in the 50s to lower 60s with 40s in
the mountains. Tomorrow the trough will be moving east and the ridge
will move closer to the coast. The trough will then move overhead on
Friday. Sunny and fair weather is expect Thursday and Friday. Winds
will be light generally though on Friday afternoon, the Columbia
Gorge and Kittitas Valley will see winds increase to 10 to 20 mph.
Temperatures will be warming with highs Thursday in the mid to upper
80s and in the mid 70s to lower 80s in the mountains. Friday will
reach the upper 80s to mid 90s with mainly 80s in the mountains. On
late Friday night and Saturday a weak front and trough will cross
the area and a slight chance of thunderstorms will be possible over
the Wallowa Mountains and eastern Wallowa County. Winds will be
breezy to windy Saturday afternoon and evening. Temperatures will
cool 2 to 5 degrees with highs in the upper 80s to mid 90s and in
the upper 70s to mid 80s in the mountains. Perry

.LONG TERM...Saturday Night through Wednesday...Mainly zonal dry
upper level flow with occasional weak troughs and ridges will
persist through the long term period. Weak ridging will move through
WA and OR Saturday night and Sunday. Broad troughing will be over WA
and OR Monday and Tuesday. A dry cold front will move through the
area Monday and may bring breezy to windy conditions in the Columbia
Basin. Cross Cascade pressure gradients will keep gap winds in the
Kittitas Valley and Columbia River Gorge Tuesday. Weak ridging will
return Wednesday. High temperatures in lower elevations will be mid
80s to lower 90s under ridging Sunday and Wednesday and 80s after
the dry cold front Monday and Tuesday.   Coonfield

&&

.AVIATION...0Z TAFs...VFR conditions will persist at all TAF sites
for the next 24 hours. Winds will decrease during the evening then
become light and diurnal late tonight and Thursday.  76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  54  84  59  90 /   0   0   0   0
ALW  60  87  64  92 /  10   0   0   0
PSC  58  88  61  95 /   0   0   0   0
YKM  56  90  62  94 /   0   0   0   0
HRI  56  87  59  93 /   0   0   0   0
ELN  54  88  57  92 /   0   0   0   0
RDM  41  86  48  91 /   0   0   0   0
LGD  50  81  52  88 /  10   0   0   0
GCD  47  85  53  93 /   0   0   0   0
DLS  56  90  63  92 /   0   0   0   0

&&

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

$$

83/76/76


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