Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 271724 AAA
AFDPDT

Area Forecast Discussion...Update
National Weather Service Pendleton OR
1024 AM PDT Sat May 27 2017

Updated Aviation Discussion

.SHORT TERM...Morning Update...The region will be under a high
amplitude upper level ridge today and tonight. The axis of the ridge
will be just west of the Cascades today and along the Cascades
tonight. As a result, the Interior Northwest will be under the
strong subsidence portion of the upper ridge. Thus expect dry and
sunny conditions with warming temps. A few high based, flat cumulus
clouds should form over the mountains this afternoon. Current
forecasts are on track, though did make some adjustments to winds,
sky cover and high temps. 90

.LONG TERM...Previous Discussion...Mid/upper level ridge of high
pressure shifts eastward Monday night allowing increasing mid level
moisture into central and north central Oregon and along the east
slopes of the Washington Cascades for a chance of showers along in
these western sections of the forecast area. Lingering marginal
instability will be present through Monday night for a slight chance
of nocturnal thunderstorms. Tuesday through Thursday night a
mid/upper level trough swings inland and moves across the interior
Pacific Northwest for an unsettled period of scattered showers and a
chance of afternoon/evening thunderstorms Tuesday afternoon/night
due to a cold front moving into the region. The upper trough exits
the region on Friday.

&&

.AVIATION...18Z TAFs...VFR conditions will prevail at all TAF sites
over the next 24 hours. There will be some cumulus buildups this
afternoon and evening over the mountains...generally between 070-
100. Otherwise skies will be clear. Winds will be light and terrain
driven at all TAF sites, less than 10 kts. Visibility will be
unrestricted. 77

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  84  52  86  53 /   0   0   0   0
ALW  86  58  90  59 /   0   0   0   0
PSC  89  52  91  54 /   0   0   0   0
YKM  90  52  90  54 /   0   0   0   0
HRI  88  51  91  52 /   0   0   0   0
ELN  88  47  88  51 /   0   0   0   0
RDM  83  42  88  47 /   0   0   0   0
LGD  79  44  84  45 /   0   0   0   0
GCD  83  42  88  43 /   0   0   0   0
DLS  91  55  93  59 /   0   0   0   0

&&

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

$$

90/99/77



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