Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 252145
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
245 PM PDT MON JUL 25 2016

.SHORT TERM...Tonight through Thursday evening...Westerly upper
level flow will persist through this period. A couple of weak waves
within this flow will move across the Pacific Northwest during the
next 24 hours. The first of these waves is moving across the area at
the moment. Cumulus clouds have been developing over the mountain
ridges in east-central Oregon and along the Washington Cascade east
slopes. At this time, instability still looks to favor the WA
Cascade east slopes in terms of the best development this afternoon
into early evening. Thus will continue to mention a slight chance of
showers and thunderstorms over the ridges of the WA Cascade east
slopes. The second wave will move across the region late tonight and
Tuesday. The air mass over the region will gradually become drier
through day Tuesday as the wave passes through the area. There could
be enough lift and moisture ahead of the wave to cause a few showers
and/or thunderstorms over portions of Wallowa county. The air mass
over the entire area will dry further Tuesday night through
Thursday. Thus expect fair and dry conditions as any other weak
waves moving east within the westerly flow aloft will not have
enough moisture to produce active weather. Locally breezy conditions
will also occur at times through Tuesday evening due to the passage
of the weak waves. High temps will remain 2-4 degrees above
seasonal, while overnight low temps will run near or slightly above
seasonal. 90

.LONG TERM...Friday through Monday...Friday the forecast area will
remain under the grip of the high pressure cell centered over the
Great Basin and as such Friday will be the warmest day with the high
temperatures in the mid 90s to lower 100s. An amplifying mid/upper
level trough in the Gulf of Alaska on Friday will move southeast
Friday night to British Columbia, which will allow flow aloft over
the Pacific Northwest to back from the west to the southwest during
the day on Saturday, which then transports some mid level moisture
and marginal instability into Wallowa County and the Wallowa
Mountains for a slight chance of afternoon/evening thunderstorms in
far NE Oregon. Otherwise, dry conditions will persist through the
extended period. The aforementioned trough will drag a dry cold
front through the region this coming weekend and this will usher in
a marine push on Saturday and Sunday, which will result in breezy to
locally windy conditions and the start of a cooling trend that
commences on Saturday and continues Sunday with cooler daytime high
temepratures 3-5 degrees below normal on Monday, or highs Monday of
82-92 degrees.

Residents and travelers should take precautionary steps to stay cool
and well hydrated on Friday. Highs on sunday will be 82 to 92
degrees, which is 3-5 degrees below normal for July 31st. Polan

&&

.AVIATION...00Z TAFS...VFR conditions will continue for the next 24
hours. Skies will be mostly clear with a few mid/high level clouds
at or above 15K feet AGL over most of the area and some cumulus
clouds developing over the Strawberry Mountains this afternoon.
Cumulus buildups are expected again along ridges in the southern
Blue mountains and the Strawberry Mountains Tuesday afternoon and
evening. Visible satellite imagery loop shows cumulus buildups
developing this afternoon over the central Washington Cascades as
well. These cumulus buildups will continue into this evening above
7K feet AGL over the Washington Cascades, but the buildups should
stay over the east slopes of the Washington Cascades and not drift
over KYKM. Sustained winds will remain below 15 kts Tuesday
afternoon, except at KDLS, which will have winds of 10-20 kts with
higher gusts after 21Z. Polan

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  64  93  59  94 /   0   0   0   0
ALW  68  94  66  94 /   0   0   0   0
PSC  65  97  63  96 /   0   0   0   0
YKM  65  96  62  96 /   0   0   0   0
HRI  66  96  61  96 /   0   0   0   0
ELN  66  91  63  93 /  10   0   0   0
RDM  52  90  47  92 /   0   0   0   0
LGD  58  91  51  90 /   0  10   0   0
GCD  56  92  52  93 /   0   0   0   0
DLS  68  89  63  93 /   0   0   0   0

&&

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

$$

90/99/99



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