Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 281724 AAA
AFDPDT

Area Forecast Discussion...Update
National Weather Service Pendleton OR
1025 AM PDT Sun May 28 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
is roughly along the Cascade crest this morning, then shift to a
position over eastern Washington and Oregon this afternoon. As a
result, much of the Interior Northwest will continue to be under the
subsidence portion of the upper ridge. Thus expect dry and sunny
conditions with warming temps and a few high based, flat cumulus
clouds over the mountains this afternoon. The exception will be
along the Cascade crest area where a southerly flow will develop
this afternoon and subsidence will be on the decrease. Thus could
see some isolated towering cumulus along the Cascade crest. At this
time do not expect any showers/storms over our area this afternoon.
Could see something develop or move into the crest area this
evening. For now will leave area dry this evening pending actual
development trends later today. Otherwise current forecasts are on
track, though did make some adjustments to winds, sky cover and high
temps. 90

.LONG TERM...Previous Discussion...A negatively tilted mid/upper
level shortwave moves through forecast area Tuesday night through
Wednesday night for a chance of rain showers and a slight chance of
thunderstorms through Wednesday night. The disturbance exits the
region on Thursday although a slight chance of showers will linger
over the eastern mountains of Oregon through Thursday evening with a
slight chance of afternoon/evening thunderstorms over the Blue
Mountains on Thursday. Friday and Saturday westerly flow aloft will
keep dry conditions over the interior Pacific Northwest.

&&

.AVIATION...18z TAFS...VFR conditions will persist over the entire
area for the next 24 hours. A ridge of high pressure will keep skies
mostly clear today, tonight and into Monday morning. There could be
a few mid level cumulus clouds (8-12k ft agl) developing over the
mountains this afternoon. Winds will be light and diurnally terrain
driven, AOB 12 kts through the period. Visibility will remain
unrestricted. 77

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  88  52  89  56 /   0   0   0   0
ALW  90  59  91  62 /   0   0   0   0
PSC  92  53  94  56 /   0   0   0   0
YKM  92  55  94  58 /   0   0   0  10
HRI  92  53  92  55 /   0   0   0   0
ELN  90  51  92  54 /   0   0  10  10
RDM  87  46  89  49 /   0   0   0  20
LGD  83  45  84  48 /   0   0   0   0
GCD  87  49  90  52 /   0   0   0  10
DLS  95  58  94  61 /   0   0   0  20

&&

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

$$

90/99/77


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