Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 241000
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
300 AM PDT TUE MAY 24 2016

.SHORT TERM...Today through Thursday...The forecast area will remain
under the influence of an elongated upper trough that is stretched
from northeast to southwest from southern Canada. This trough is
causing some moisture to sag southward into the northern portions of
the CWA. This is mainly currently causing clouds...but there is also
some light rain showers over eastern Washington and the Idaho
panhandle. This moisture is expected to continue sagging southward
today into the eastern/northeast mountains of the CWA by this
afternoon. This combined with surface heating will trigger mainly
afternoon showers and isolated thunderstorms. There will also be
some residual moisture over the Cascade east slopes and in central
Oregon where isolated showers may also occur. This pattern will
persist into Wednesday but the focus of the showers and afternoon
thunderstorms will shift eastward as the upper trough weakens and an
upper ridge off shore tries to build into the Pacific Northwest. The
mid level flow over the CWA will become northwest on Thursday ahead
of the next upper low pressure system that is expected to move
southeast out of BC into the CWA on Thursday. The overall trend is
for decreasing showers on Thursday, with the showers then mainly
just over Wallowa County and the northern Blue Mountains. Some
showers may also develop along the Cascade east slopes on Thursday
as the next trough moves into the region. Thunderstorms are not
expected on Thursday. It will become breezy at times during the
afternoons and evenings...especially in the eastern Columbia River
Gorge...the Kittitas Valley and the Lower Columbia Basin of Oregon.
Temperatures will slowly warm by a degree or two today and Wednesday
to near normal, but then will cool back down on Thursday to slightly
below normal. 88

.LONG TERM...Thursday night through Memorial Day...a mid/upper level
low will enter Pacific Northwest thursday night and move slowly
south across forecast area on Friday. scattered showers will be
possible over the eastern mountains Friday afternoon with a slight
chance of afternoon/evening thunderstorms in Grant County, southern
Union County and Wallowa County. Friday night through Memorial Day
the mid/upper low will meander and remain essentially stationary
over the region for a chance of showers over mountains and a slight
chance of afternoon/evening thunderstorms each day.  Polan

&&

.AVIATION....12Z TAFS...VFR conditions will occur through the
forecast period. SCT high clouds around daybreak this morning. then
cloud bases will lower to mid levels by late this morning and
persist through this afternoon. then some afternoon showers possible
over and near the mountains. Winds will be 5-15 kts peaking Tuesday
afternoon.  polan

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  71  48  72  44 /  10  10  10  10
ALW  73  52  73  50 /  10  10  10  10
PSC  77  53  81  50 /  10  10  10  10
YKM  76  49  80  46 /  10  10  10  10
HRI  76  51  79  49 /  10  10  10  10
ELN  72  52  74  48 /  20  10  10  10
RDM  67  38  69  33 /  10  10  10  10
LGD  66  43  69  43 /  20  30  30  20
GCD  67  41  70  40 /  20  20  20  10
DLS  75  53  72  50 /  10  10  10  10

&&

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

$$

88/99/99


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