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Area forecast discussion 
National Weather Service Pendleton or
110 am PDT sun Jul 24 2016

Short 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. 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
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 sky clear conditions will prevail for the
next 24 hours. Winds will generally remain 12 knots 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...




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