745
FXUS66 KPDT 192134
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
233 PM PDT Wed Jun 19 2024

.SHORT TERM...Tonight through Friday...As mentioned in the morning
forecast update discussion, some shallow instability from the weak
upper level trough over the region has lead to some showers
developing over the eastern mountains this afternoon. These showers
will continue into the evening then dissipate towards sunset. The
shallow nature of the convection means lightning is unlikely but
would not rule out some random strikes. Otherwise, skies remain
mostly clear across the rest of the forecast area today with warmer
temperatures boosting high temperatures into the 80s around the
Columbia Basin and 70s in the mountains and light winds.

Conditions will be very similar Thursday with the weak lingering
trough over the region and its associated instability. For now the
chance of showers over the eastern mountains is less than 10% so no
mention of showers at this time but this could change with
subsequent forecast updates. By Friday the weak trough finally exits
to the east and a flat ridge of high pressure moves over the area.
This will allow temperatures to continue to increase another 3 to 6
degrees on Thursday and 2 to 5 on Friday. This will bring high
temperatures in the Columbia Basin to the upper 80s to mid 90s on
Friday and 80s in the mountains. Winds will remain light overall
with an afternoon north to northeast in the afternoon producing
winds of 5 to 10 mph Thursday and Friday.


.LONG TERM...Saturday through Wednesday...A upper level ridge will
remain over the region Saturday until exiting eastward Sunday when
the zonal pattern arrives through Monday. Then, a weak ridge will
build over the PacNW late Monday into Wednesday. Dry, warm
conditions continues for the extended period with no chances of
precip. High temperatures for Saturday will remain above normal in
the 80s and 90s for the forecast area. Sunday through midweek,
temperatures cool down by few degrees as westerly flow increases
with the arrival of the weak upper trough driven by a closed low off
British Columbia.

High chances (>70%) for breezy conditions with wind gusts at 20-30
mph beginning late Saturday along the east slopes of the Cascades
then spreading across the Columbia Basin Sunday. Sunday windy
conditions could occur for Blue Mountain Foothills, Columbia River
Gorge and the Kittitas Valley with wind gusts exceeding to 40-45 mph
(60-80% probability). With increased winds and dry conditions, this
will elevate concerns for increased fire weather through Sunday
around Columbia Basin. Otherwise, winds will then decrease late
Sunday night but breezy winds continue across the forecast area with
wind gusts at around 15-25 mph through Wednesday (40-50%
probability). Feaster/97


&&

.AVIATION...


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  51  88  54  91 /  10   0   0   0
ALW  53  92  56  93 /  10   0   0   0
PSC  56  93  59  95 /   0   0   0   0
YKM  54  89  58  93 /   0   0   0   0
HRI  54  94  57  96 /   0   0   0   0
ELN  51  87  55  91 /   0   0   0   0
RDM  43  84  51  88 /   0   0   0   0
LGD  43  84  53  86 /  20   0   0   0
GCD  46  86  51  88 /  10   0   0   0
DLS  59  93  62  95 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&

$$

SHORT TERM...91
LONG TERM....97
AVIATION...97