374
FXUS66 KPDT 282252
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
252 PM PST FRI NOV 28 2025
DISCUSSION
SKIES ARE CLEARING ONCE AGAIN OVER MUCH OF THE BASIN
AS AN UPPER-LEVEL TROUGH THAT BROUGHT STEADY SHOWERS AND MOUNTAIN
SNOW TO MUCH OF THE FORECAST AREA EARLY THIS MORNING MOVES OUT OF
THE PACNW. NW FLOW ALOFT WILL TAKE ITS PLACE AS WE ENTER A PROLONGED
PERIOD OF COLDER CONDITIONS, AS ENSEMBLE GUIDANCE GENERALLY LOCKS
THE FORECAST AREA UNDER A STEADY SYNOPTIC PATTERN OF NW FLOW WITH
EMBEDDED SHORTWAVE ACTIVITY WITHIN. WHILE THESE SHORTWAVES LOOK TO
BE RELATIVELY MOISTURE-STARVED, OUR MOUNTAIN ZONES AND EVEN LOWLAND
AREAS COULD SEE LIGHT SNOW OVER THE NEXT WEEK AS THIS PATTERN FAVORS
UPSLOPE ENHANCEMENT OF PRECIP EVEN IN THE ABSENCE OF AN ATMOSPHERE
CHARGED WITH MOISTURE.
REST OF THE DAY LOOKS DRY, HOWEVER LOW CLOUDS AND EVEN PATCHY FOG
MAY PERSIST AND REDEVELOP THIS EVENING GIVEN RECENT MOISTURE AND
LIGHT WINDS IN THE FORECAST. THE NEXT BEST CHANCE FOR PRECIP (AS
PART OF THE AFOREMENTIONED SHORTWAVES) LOOKS TO BE LATE SATURDAY
EVENING INTO SUNDAY MORNING. MODELS AREN'T BULLISH ON PRECIP
AMOUNTS, SO NO HEADLINES LOOK TO BE NECESSARY, HOWEVER SHOULD NOTE
THAT THESE NW SYSTEMS DO FAVOR POCKETS OF PROLONGED SNOWFALL ALONG
THE NORTHERN BLUES AND EVEN INTO THE FOOTHILLS. THE HREF IN
PARTICULAR SEEMS TO SUGGEST A LOW-END (30-40%) CHANCE FOR SNOW ALONG
THE FOOTHILLS, STRETCHING FROM PENDLETON TO WALLA WALLA. SNOW LEVELS
SEEM BORDERLINE, AND TEMPS MAY WARM UP DURING THE DAY SATURDAY, BUT
THE COMBINATION OF ONCOMING CLOUD COVER + COLD POOLING IN THE BASIN
MAKES ME PARTIALLY SKEPTICAL OF THE NBM SNOW LEVEL FORECAST. COULD
ULTIMATELY AMOUNT TO NOTHING, BUT AM STILL WARY OF STUBBORN, UPSLOPE
SNOW SHOWERS GIVEN THE PATTERN. BUT FOR THE BLUES THEMSELVES,
EXPECTING ONLY ABOUT 1 TO 2 INCHES AT BEST.
THE NEXT SHORTWAVE LOOKS TO ARRIVE AROUND TUESDAY. THIS WAVE LOOKS
TO BE A BIT MORE POTENT BASED ON EARLY NBM QPF READINGS (AT LEAST
FOR THE BLUES), BUT MUCH COULD CHANGE GIVEN HOW PROGRESSIVE THE
SYNOPTIC PATTERN IS. THE KEY WILL BE WHERE EXACTLY THE AXIS OF THIS
SHORTWAVE FALLS UPON ARRIVAL. OTHERWISE, EXPECT COLD AND GENERALLY
CLOUDY CONDITIONS, WITH HIGHS IN THE 40S AND LOWS IN THE 20S ACROSS
MOST AREAS. 74
AVIATION...00Z TAFS
SUB-VFR CONDITIONS DUE TO LOW CIGS
ARE AFFECTING RDM/BDN ARE SUB-MVFR AND ALW IS SUB-VFR AND WILL
CONTINUE TO REMAIN AS SUCH THROUGH 14Z FOR RDM/BDN AND 08Z FOR ALW.
HOWEVER, THERE IS A 30% CHANCE CIGS COULD RETURN TO SUB-MVFR BETWEEN
05-09Z AT RDM/BDN. PDT IS SUB-VFR BUT MAY SEE A (60-80%) CLEARING OF
CIGS AFTER 01Z ONLY TO SEE SUB-VFR CONDITIONS RETURN AROUND 14Z.
YKM/PSC ARE VFR AND WILL REMAIN VFR THROUGH THE PERIOD. WINDS ARE
MOSTLY VARIABLE AND BELOW 10KTS. 90
PRELIMINARY POINT TEMPS/POPS
PDT 29 40 26 38 / 0 10 30 0
ALW 31 38 28 37 / 0 10 40 10
PSC 29 41 24 38 / 0 10 20 0
YKM 28 41 23 41 / 0 10 10 0
HRI 29 41 26 39 / 0 10 30 0
ELN 25 38 21 38 / 0 10 10 0
RDM 24 43 25 40 / 0 0 20 0
LGD 27 43 25 40 / 0 10 50 0
GCD 27 48 26 41 / 0 0 40 0
DLS 34 44 34 44 / 0 10 30 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
DISCUSSION...74
AVIATION...90
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