Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 280956
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
256 AM PDT THU JUL 28 2016

.SHORT TERM...Today through Saturday...A building ridge of high
pressure over the western US will keep the area dry and hot for the
next couple of days. Models show instability over the mountains but
moisture will be very limited. Models do show some moisture over the
Washington Cascades this afternoon but also show that any showers or
thunderstorms will stay north of our area. The GFS also shows some
moisture circulating around the low and into southern Oregon but it
does not appear that it will get as far north as central Oregon.
Temperatures will be quite warm again and perhaps a couple of
degrees warmer than Wednesday with highs in the mid 90s to lower
100s with mid 80s to mid 90s in the mountains. Winds will be fairly
light in general though the Kittitas Valley, Columbia Gorge and
Central Oregon will reach 10 to 15 mph in the late afternoon and
early evening. Friday will be similar to today with any moisture and
convective activity staying to the north and south of our area.
Temperatures will nudge up a degree or so from today. Friday
afternoon an upper low and trough will move into northern British
Columbia and begin flattening the ridge. Friday afternoon will see a
slight increase in winds in the Kittitas Valley with 15 to 20 mph
winds which will continue into the night while the rest of the area
is similar to today. On Saturday the trough will begin having more
of an effect as winds shift to the west and bring cooler air into
the area. Temperatures will drop to the lower to mid 90s with 80s in
the mountains. Models show some moisture brushing the southern
fringe of the area Saturday morning but getting pushed to the south
in the afternoon, so no showers or thunderstorms are anticipated.
The trough will tighten pressure gradients in the afternoon and the
Columbia Basin will reach 10 to 20 mph with 15 to 25 mph in the
Kittitas Valley and Columbia Gorge. The combination of wind and low
relative humidities may create some fire weather concerns Saturday
afternoon. Perry

.LONG TERM...Saturday night through Thursday...The first part of the
extended period will be dominated by a dry and stable westerly flow
aloft. This will keep warm conditions with mostly clear skies over
the CWA from Saturday night through Monday. Pressure gradients will
tighten up on Sunday causing breezy to windy conditions...mainly in
the Lower Columbia Basin and adjacent foothills...as well as the
Kittitas Valley. Then there will be a very weak disturbance and a
broad upper trough passing across the region Monday night and
Tuesday. However moisture will be very limited and can only expected
perhaps a few sprinkles over the Washington Cascades. Pressure
gradients will tighten up again on Monday night and Tuesday as well
for breezy conditions. The flow will then become northwest and
dry/stable by Wednesday morning. This will bring a return to fair
weather. Temperatures will be warm on Wednesday, and then hot on
Thursday as the dry west to northwest flow continues with mostly
light winds and mostly clear skies. 88

&&

.AVIATION...12Z TAFs...VFR conditions with hot temperatures and
mostly clear skies will prevail during the next 24 hours. Winds will
be light and less than 15 kts at all TAF sites. 88

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  99  65 100  65 /   0   0   0   0
ALW  98  72 100  71 /   0   0   0   0
PSC 101  68 102  67 /   0   0   0   0
YKM 100  70 102  68 /   0   0   0   0
HRI 101  66 102  67 /   0   0   0   0
ELN  97  65  96  63 /   0   0   0   0
RDM  96  56  99  54 /   0   0   0   0
LGD  94  58  96  59 /   0   0   0   0
GCD  98  60  99  61 /   0   0   0   0
DLS 100  69  97  66 /   0   0   0   0

&&

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

$$

83/88/88


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