FXUS66 KPDT 250336

Area Forecast Discussion
National Weather Service Pendleton OR
836 PM PDT Sat Aug 24 2019

.UPDATE...A weak disturbance moving near to the area was
tightening pressure gradients and creating breezy west winds.
As the disturbance drifts away tonight the winds are expected to
lessen. Meanwhile some mid and high level clouds were passing
through the area and this should decrease as well and the forecast
was modified to reflect this. Also overnight low temps were
adjusted and are expected to fall into the 50s with 40s in the


.PREV DISCUSSION... /issued 420 PM PDT Sat Aug 24 2019/

SHORT TERM...Tonight through Monday night. Upper level trough and
strong jet moving across the Pacific northwest. Main impacts for
today and this evening are breezy to locally windy conditions.
These winds will diminish after sunset. Otherwise plenty of high
level clouds evident on satellite with partly cloudy conditions
expected tonight into Sunday morning. Upper ridge starts to build
back into the area later Sunday with clearing skies. The ridge
becomes stronger Monday and Tuesday with warming temperatures and
mainly clear skies. Locally breezy westerly winds Sunday then
lighter Mon and Tue. 94

LONG TERM...Tuesday through Thursday Night...Models are in good
agreement in having a ridge over the area Tuesday and Tuesday night
with clear skies and fair weather expected. However, by Wednesday,
models have a weak wave approaching from the southwest and shoving
the ridge eastward. It also pulls subtropical moisture northward on
a south to southwesterly flow. Wednesday afternoon and evening the
front edge of the moisture is in central Oregon and the John-Day
Ochoco Highlands. The moisture is at around 12-15 thousand feet and
I do not see much instability, so have kept the forecast dry for
now. Moisture drops to 5-10 thousand feet overnight and models start
showing showers in the overnight period. Will take a wait and see
approach on nocturnal showers but have added a slight chance of
showers and thunderstorms in central Oregon and the eastern Oregon
mountains Thursday afternoon and evening. The wave and most of the
moisture is moving out of the area overnight Thursday night so have
a dry forecast. Tuesday will have temperatures in the 80s and lower
90s and Wednesday and Thursday will warm to the mid 80s to mid 90s.
Winds will be light through the period. Perry

Friday through Saturday...Overall quiet pattern will persist across
the region as broad southwest flow brings near to above normal
temperatures in the upper 80s to lower 90s. Will need to watch a
system for overnight Saturday into Sunday morning that may bring a
few showers to the Washington Cascades, but most of this energy
looks to impact areas north of the region. Richards

AVIATION...Mainly vfr conditions will persist. However brief
gusty winds between 20 kts to 25 kts may develop at some taf sites
after 20z tomorrow.


PDT 54 81 47 82 / 0 0 0 0
ALW 58 83 52 85 / 0 0 0 0
PSC 57 85 51 86 / 0 0 0 0
YKM 52 84 47 86 / 0 0 0 0
HRI 57 85 50 87 / 0 0 0 0
ELN 55 77 47 84 / 0 0 0 0
RDM 45 82 41 84 / 0 0 0 0
LGD 51 77 43 80 / 0 0 0 0
GCD 49 82 44 84 / 0 0 0 0
DLS 57 82 52 88 / 0 0 0 0




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