444
FXUS66 KPDT 301201
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
401 AM PST SUN NOV 30 2025
UPDATED AVIATION...12Z TAFS
FOG MAY HAVE SIGNIFICANTLY
DECREASED, BUT THE LOW STRATUS LAYER WITH LIGHT SNOW/MIST WILL BE
THE MAIN HIGHLIGHTS FOR THIS MIXTURE OF FLIGHT CATEGORIES (MVFR
CONDITIONS OR LOWER) FOR MOST SITES EXCEPT KDLS/KYKM/KPSC BEING
VFR. KBDN WILL CONTINUE SEEING LIGHT SNOW INTO THIS LATE MORNING
(20-40% CONFIDENCE). THE LOW STRATUS LAYER MAY LAST THROUGH THIS
LATE MORNING/EARLY AFTERNOON FOR KPDT, KRDM, KBDN, AND KALW, WHICH
SHOULD BEGIN DISSIPATING BY THEN. HOWEVER, PATCHY FOG MAY RETURN
THIS EARLY MORNING FOR KDLS/KPDT/KALW/KPSC BUT WILL CONTINUE TO
MONITOR THOSE AREAS. WINDS WILL REMAIN LESS THAN 10 KTS.
FEASTER/97
PREV DISCUSSION
/ISSUED 323 AM PST SUN NOV 30 2025/
DISCUSSION
SNOW IS TAPERING OFF OVER THE BLUE MOUNTAINS AS THE
UPPER-LEVEL LOW THAT INDUCED LIGHT SNOW ACROSS MUCH OF CENTRAL TO
EASTERN OREGON AND SOUTHEAST WASHINGTON EXITS TO THE SOUTHEAST.
IN ITS WAKE, CONFIDENCE IS HIGH (90 PERCENT) THAT WIDESPREAD LOW
STRATUS ACCOMPANIED BY AT LEAST PATCHY DENSE FOG WILL CONTINUE
THROUGH THIS MORNING. DRY CONDITIONS ARE THEN ANTICIPATED INTO
MONDAY AFTERNOON AS UPPER-LEVEL RIDGING NOSES INTO THE PACIFIC
NORTHWEST. THIS WILL LIKELY (70 PERCENT CONFIDENCE) RESULT IN
ANOTHER ROUND OF STRATUS AND FOG FOR BASIN AREAS TONIGHT THROUGH
MONDAY MORNING.
LOOKING AHEAD, ANOTHER SHORTWAVE EMBEDDED WITHIN NORTHWESTERLY
FLOW ALOFT IS ADVERTISED FOR LATE MONDAY THROUGH TUESDAY NIGHT.
SNOW CHANCES ARE REDUCED ACROSS THE COLUMBIA BASIN AND BLUE
MOUNTAIN FOOTHILLS (10-30 PERCENT CHANCE OF MEASURABLE SNOW PER
NBM GUIDANCE) COMPARED TO THE ONE THAT BROUGHT LOW-ELEVATION
SNOWFALL TO THE BLUE MOUNTAIN FOOTHILLS YESTERDAY EVENING INTO
EARLY THIS MORNING, BUT A BETTER MOISTURE TAP SHOULD FACILITATE
SLIGHTLY BETTER CHANCES (15-30 PERCENT) OF ADVISORY-LEVEL SNOW
FOR THE BLUE MOUNTAINS. ENSEMBLE GUIDANCE IS NOW ALSO SUGGESTING
SOME LOCALLY BREEZY WESTERLY WINDS THROUGH THE CASCADES GAPS ON
TUESDAY.
BY THE END OF THE WEEK, ENSEMBLE SOLUTIONS BEGIN TO DIVERGE WITH
REGARD TO PATTERN DETAILS, SPECIFICALLY WHETHER UPPER-LEVEL
RIDGING WILL PERSIST ON FRIDAY (~60 PERCENT OF MEMBERS) OR A MORE
ZONAL PATTERN (~40 PERCENT OF MEMBERS) WILL BEGIN. BY SATURDAY, A
TRANSITION TO A MORE ZONAL UPPER-LEVEL PATTERN IS PRESENT AMONG
ALL ENSEMBLE CLUSTERS. AS FAR AS TANGIBLE WEATHER, THIS WOULD
RESULT IN WARMER, WETTER, BREEZIER CONDITIONS. OF NOTE, EFI
VALUES RANGING FROM 0.5-0.8 ACROSS THE COLUMBIA PLATEAU ARE
POINTING TO DECENT ENSEMBLE AGREEMENT IN WINDY CONDITIONS RELATIVE
TO MODEL CLIMATOLOGY.
PRELIMINARY POINT TEMPS/POPS
PDT 22 39 29 41 / 0 0 40 60
ALW 25 37 31 38 / 0 10 50 60
PSC 24 37 27 39 / 0 0 30 20
YKM 24 38 26 43 / 0 0 20 10
HRI 25 37 29 42 / 0 0 30 40
ELN 22 37 26 42 / 10 10 20 10
RDM 19 49 27 47 / 0 0 10 10
LGD 21 42 31 41 / 0 0 40 80
GCD 21 46 31 43 / 0 0 30 60
DLS 30 42 35 49 / 0 10 30 20
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
SHORT TERM...86
LONG TERM....86
AVIATION...97
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