Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 270959
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
259 AM PDT MON JUN 27 2016

.SHORT TERM...Today through Wednesday...A high pressure ridge will
continue its dominance over the CWA. The ridge axis will shift to
the east a little causing the flow to become southwest. Some
moisture and instability will be pulled northward into the CWA in
the southwest flow. With strong surface heating and hot temperatures
combined with the increased moisture and instability will result in
isolated afternoon thunderstorms today...mainly over the northeast
mountains and the Cascade east slopes. Elsewhere it should remain
dry today. Still have some isolated pops for thunderstorms over the
Wallowa Mountains on Tuesday...though it will be drier and more
stable on Tuesday. Then on Wednesday there will be another increase
in moisture and instability resulting in a slight chance of
afternoon thunderstorms over the northeast mountains. Thunderstorms
throughout the short term period will be weak and isolated.
Temperatures will continue on a warming trend...though it will only
be slightly warmer each day through Wednesday. Maximum temperature
readings will be in the upper 80s to mid 90s by Wednesday in the
lower elevations with mostly 70s and 80s in the mountains. Winds
will generally be light and under 15 kts during the short term
period. 88

.LONG TERM...Wednesday night through Sunday night...A long wave
mid/upper level ridge of high pressure will remain parked over the
Rockies thus putting the interior Pacific Northwest on the western
flank of the ridge. This upper level pressure pattern will place a
southwest flow aloft across the forecast area, which will allow a
modest influx of mid level moisture to enter the region from
offshore waters Wednesday night through Saturday. Daytime surface
heating over the mountains of northeast Oregon will give a slight
chance of thunderstorms Wednesday afternoon/evening from the
northern Blue Mountains of Oregon to Idaho. The greatest instability
and moisture will occur on Thursday and Friday for a slight chance
of afternoon/evening thunderstorms in the Blue Mountains of
Washington and Oregon to Idaho. High temperatures through Friday
will be in the upper 80s to mid 90s each day at lower elevations, or
around 8-15 degrees above normal, and in the upper 60s to mid 80s in
the mountains. Saturday a weak mid/upper level trough will swing
through the region and usher in a marine push that will bring in a
tad cooler airmass for high temperatures on Saturday and Sunday in
the mid 80s to around 90, upper 60s to mid 80s in the mountains.
Polan

&&

.AVIATION...12Z TAFs...VFR conditions will continue at all TAF sites
for the next 24 hours.  Polan

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  95  64  94  65 /   0  10   0   0
ALW  95  69  95  68 /  10  10   0   0
PSC  97  64  96  64 /  10   0   0   0
YKM  97  63  97  63 /  10  10   0   0
HRI  96  65  96  65 /  10   0   0   0
ELN  92  62  93  61 /   0  10   0   0
RDM  89  54  90  54 /   0   0   0   0
LGD  93  58  90  58 /  20  20   0   0
GCD  93  57  91  57 /  10  10   0   0
DLS  97  66  94  65 /   0   0   0   0

&&

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

$$

88/99/99



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