691
FXUS66 KPDT 261146
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
346 AM PST WED NOV 26 2025
DISCUSSION
A SHORTWAVE IS CURRENTLY MAKING ITS WAY
THROUGH OREGON, BRINGING RAIN IN THE LOWER VALLEYS WITH
SNOW/WINTRY MIX IN THE EASTERN MOUNTAINS AND PARTS OF THE BLUE
MOUNTAINS. UP TO A TENTH OF AN INCH HAS FALLEN IN THE BASIN WITH
HIGHER QPF AMOUNTS IN THE WA CASCADES. PRECIPITATION WILL CONTINUE
TO PUSH TOWARDS THE SE WITH A MORE SOUTHERN DIRECTION OVERNIGHT.
HEADING INTO THE AFTERNOON HOURS TODAY, THE SYSTEM WILL REVERSE
COURSE AND BEGIN TO PUSH FROM THE SW TO NE WITH A MORE WARMER
SET-UP COMPARED TO WHAT WE SEE CURRENTLY AND EARLIER IN THE NIGHT
THANKS TO AN INCOMING WARM FRONT. THANKSGIVING DAY WILL PAVE TO
BE A MORE RAIN ORIENTED EVENT, WITH HINTS ON LIGHT SNOW AND WINTRY
MIX IN THE WA CASCADES NEAR THE KITTITAS VALLEY.
SNOW LEVELS WILL DROP TO 3500 TO 4500 FEET GOING THROUGH FRIDAY AS
A COLD FRONT BRINGING LIGHT MOUNTAIN SNOW BACK INTO THE PICTURE.
QPF AMOUNTS DON'T LOOK IMPRESSIVE WITH THE LATEST NBM RUN
SHOWCASING UP TO 2 INCHES (40-60 PERCENT CHANCE CONFIDENCE).
ELSEWHERE, LOW VALLEY RAIN WILL CONTINUE TO DEVELOP WITH 30 TO 50
PERCENT POPS THROUGH FRIDAY EVENING. THE COLD FRONT IS EXPECTED TO
PASS SOMETIME LATE SATURDAY MORNING TO EARLY AFTERNOON, WITH
ENOUGH COLD AIR TO GIVE 15 TO 25 PERCENT CHANCES OF SNOW IN THE
BASIN, GIVING US THE FIRST POSSIBLE SNOW DAY IN MANY PARTS OF THE
LOW LYING AREAS. ANY ACCUMULATIONS IS NOT EXPECTED TO BE GREAT
WITH THE NBM BARELY SHOWING TRACE AMOUNTS OVER THE REGION (70 TO
90 PERCENT CONFIDENCE). REGARDLESS, LOW TEMPERATURES SATURDAY
GOING INTO SUNDAY ARE EXPECTED TO DROP INTO THE LOW TO MID 20S
OVER THE REGION WITH HIGH TEENS IN PARTS OF HIGHER ELEVATIONS
LASTING THROUGH MONDAY AS WELL.
AVIATION...12Z TAFS
AN ADVANCING WARM FRONTAL ZONE LATER TODAY WILL PROMOTE A GRADUAL
DETERIORATION OF CEILINGS FOR THE TERMINALS THROUGH THE TAF PERIOD.
LIGHT AND VARIABLE WINDS TO CALM WINDS AS CEILINGS ACROSS THE AREA
THROUGH THE PERIOD. A RELATIVE LULL TO THE RAIN AT THE TERMINALS
WILL GIVE WAY CERTAINLY BY AFTERNOON AS THE EAST TO WEST RAIN AXIS
LIFTS NORTH OVERSPREADING THE COLUMBIA BASIN IN THE LATE AFTERNOON
AND EARLY EVENING. IFR WILL BE COMMON BY THE EVENING WITH LOWER
CEILINGS BECOMING ESTABLISHED DURING THE OVERNIGHT IN THE LIFR
FLIGHT CAT.
PRELIMINARY POINT TEMPS/POPS
PDT 48 35 46 35 / 40 50 40 70
ALW 46 37 46 38 / 50 60 60 80
PSC 45 36 46 36 / 10 50 50 70
YKM 45 35 45 35 / 10 50 70 70
HRI 47 36 46 37 / 20 50 50 70
ELN 42 32 41 33 / 10 70 80 80
RDM 52 27 57 33 / 30 0 10 20
LGD 46 35 49 35 / 70 50 30 60
GCD 50 33 56 34 / 50 20 10 30
DLS 48 40 48 42 / 60 60 80 90
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...WINTER WEATHER ADVISORY UNTIL 4 AM PST EARLY THIS MORNING FOR
WAZ026-522-523.
SHORT TERM...95
LONG TERM....95
AVIATION...71
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