Area Forecast Discussion
Issued by NWS Pendleton, OR

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143
FXUS66 KPDT 240811
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
110 AM PDT SUN JUL 24 2016

.SHORT TERM...Today through Tuesday night...The short term period
will start out with a dry and stable northwest flow aloft today with
a high pressure ridge off the coast. Despite the northwest flow
heights and thickness values will be on the increase resulting in a
warming trend beginning today. The flow will then become southwest
tonight with weak upper troughing developing off the coast.
However...the atmosphere will remain dry and stable due to a lack of
moisture. After that the flow will become west to southwest on
Monday. The warming trend will continue as a result on Monday. There
will be very little moisture with the system on Monday and the main
effect will be some mid to high clouds and some increase in
instability. However...am not impressed with the amount of
instability or the increase in moisture. Will therefore leave out
any mention of thunderstorms on Monday afternoon or evening. On
Tuesday drier air will move into the region with a westerly flow for
mostly clear skies again. Temperatures on Tuesday will be a few
degrees cooler in the wake of the weak disturbance on Monday. Not
much change is expected going into the extended forecast period
except there will be another slow warming trend. Winds will be light
today through Monday...but then winds will increase to the breezy to
windy category by Tuesday afternoon in the eastern Columbia River
Gorge and in the Kittitas valley. These winds will diminish and
become light again Tuesday night. Elsewhere winds will remain light
on Tuesday and Tuesday night. 88

.LONG TERM...Wednesday through Saturday...The interior Pacific
Northwest will reside at the northern periphery of a large dome of
high pressure centered across the Desert Southwest/Great Basin.
Dry conditions will prevail through at least Friday. The GFS
continues to show some moisture nudging northward Saturday...but the
other medium range models keep the local area dry. Will cap PoPs at
around 10% Saturday afternoon across Central Oregon to the eastern
mountains. The main forecast concern will be the building heat...as
850mb temperatures rise from 21-23C Wed/Thu to 24-26C Fri/Sat. Will
continue to forecast highs at the warmer side of the guidance
envelope...with mid/upper 90s for the lowest elevations
Wed/Thu...and 98-103 Fri/Sat. There will be only minor relief from
the heat across the mountains...with highs warming well into the
80s...with some lower 90s possible by Saturday. Low temperatures
will rise gradually as well...with widespread 60s for the lower
elevations...with a few locations remaining around 70 Friday night.

&&

.AVIATION...12Z TAFs...VFR/mainly SKC conditions will prevail for the
next 24 hours. Winds will generally remain 12 KT or less.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  89  58  94  63 /   0   0   0   0
ALW  90  64  95  68 /   0   0   0   0
PSC  92  59  97  65 /   0   0   0   0
YKM  91  59  96  64 /   0   0   0   0
HRI  92  57  96  66 /   0   0   0   0
ELN  90  59  92  65 /   0   0   0   0
RDM  89  50  91  51 /   0   0   0   0
LGD  86  50  92  58 /   0   0   0   0
GCD  90  55  93  57 /   0   0   0   0
DLS  92  64  92  66 /   0   0   0   0

&&

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

&&

$$

88/80/80



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