757
FXUS66 KPDT 102221
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
221 PM PST SAT JAN 10 2026
DISCUSSION
A RIDGE SITUATED OVER THE PACNW WILL FLATTEN TODAY IN
RESPONSE TO A SERIES OF UPPER-LEVEL WAVES PASSING TO OUR NORTHWEST.
THESE WAVES WILL BRING PRECIP TO THE CENTRAL WA CASCADES OVER THE
NEXT COUPLE OF DAYS, BUT WITH SNOW LEVELS RISING TO ABOVE 5000 FT BY
MIDDAY SUNDAY DUE TO W/SW FLOW ALOFT, NOT EXPECTING ANY SNOW IMPACTS
TO OUR MAIN MOUNTAIN PASSES IN THE AREA. THE REGION WILL OTHERWISE
BE ENTERING A BENIGN PATTERN OVER THE NEXT WEEK, AS HIGH PRESSURE
RETURNS TUESDAY INTO WEDNESDAY.
NOT MUCH TO SPEAK OF THIS AFTERNOON AS LATEST SATELLITE IMAGERY
DEPICTS MID-LEVEL CLOUDS POURING INTO THE FORECAST AREA AS A RESULT
OF THE AFOREMENTIONED W/SW FLOW. SHOWERS REMAIN SITUATED OVER THE
OLYMPIC PENINSULA, BUT ARE EXPECTED TO SHIFT WEST-NORTHWESTWARD
OVER THE NEXT 24 HOURS, CLIPPING THE CENTRAL WA CASCADES WITH
PRECIP. AGAIN, OUTSIDE OF MOUNTAINTOPS, SNOWFALL IMPACTS TO THE AREA
ARE EXPECTED TO BE MINIMAL, WITH LITTLE TO NO SNOW OCCURRING ACROSS
SNOQUALMIE, BLEWETT, OR WHITE PASSES. OTHERWISE, ONLY IMPACTS TODAY
ARE BREEZY WINDS ACROSS THE GRANDE RONDE VALLEY STEMMING FROM THIS
RIDGE FLATTENING, AND SOME LOCALLY DENSE FREEZING FOG IN THE
KITTITAS VALLEY THIS MORNING DUE TO RELATIVELY STAGNANT CONDITIONS
THERE.
HIGH PRESSURE REBUILDS BY THE MIDWEEK, HOWEVER MODELS DISAGREE AS TO
WHERE THIS RIDGE CENTERS ITSELF THROUGH THE END OF THE WORK WEEK.
DETERMINISTIC GUIDANCE SUGGESTS WE'LL SEE ANOTHER FLATTENING OF THIS
RIDGE LATE WEDNESDAY INTO THURSDAY, BEFORE REBUILDING OFFSHORE
HEADING INTO NEXT WEEKEND. LITTLE SIGNAL FOR PRECIP CURRENTLY EXISTS
ACROSS ENSEMBLE GUIDANCE AS OF NOW, SO MAIN IMPACTS FROM THIS
PATTERN WOULD BE A SLIGHT REBOUNDING OF TEMPS, BEFORE FOG DEVELOPS
ACROSS THE BASIN MIDWEEK DUE TO THE STRENGTHENING TEMPERATURE
INVERSION OVER TIME. 74
AVIATION...00Z TAFS
HIGH PRESSURE CONTINUES TO DOMINATE THE
REGION, LEADING TO LIGHT WINDS. VFR FLIGHT CATEGORIES ARE OF HIGH
CONFIDENCE FOR ALL THE THE TERMINALS (90%) FOR THE DURATION OF
THE PERIOD. THERE IS A LOW CONFIDENCE (MAYBE 10%) THAT IFR STRATUS
(500 TO 1000 FT CEILINGS) CAN RETURN AROUND KDLS AT ANY TIME
OVERNIGHT OR EARLY IN THE DAY SUNDAY. RUSSELL/71
PRELIMINARY POINT TEMPS/POPS
PDT 30 52 34 55 / 0 0 0 0
ALW 34 50 37 55 / 0 10 0 10
PSC 29 49 33 54 / 0 10 0 0
YKM 30 44 33 50 / 0 20 10 10
HRI 30 47 32 53 / 0 10 0 0
ELN 29 41 32 48 / 10 30 30 30
RDM 26 52 28 54 / 0 0 0 0
LGD 30 44 31 48 / 0 0 0 0
GCD 28 48 30 53 / 0 0 0 0
DLS 35 49 36 51 / 0 10 10 10
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
DISCUSSION...74
AVIATION...71
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