166
FXUS66 KPDT 231755
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
955 AM PST MON FEB 23 2026
KEY MESSAGES
- AREAS OF MOUNTAIN SNOW AND LOW VALLEY RAIN CONTINUE THROUGH
THE NIGHT.
- DRIER PATTERN, ESPECIALLY IN THE COLUMBIA BASIN, EXPECTED IN
THE SECOND HALF OF THE WEEK.
- CHANCES OF LIGHT MOUNTAIN SNOW SHOWERS CONTINUE THROUGH NEXT
WEEK, WITH MOSTLY DRY CONDITIONS IN LOWER ELEVATIONS.
DISCUSSION
SATELLITE AND RADAR CONTINUE TO ADVERTISE THE ATMOSPHERIC RIVER
IMPACTING THE PACNW REGION WITH HEAVY MOUNTAIN SNOW IN THE
WASHINGTON CASCADES AND, TO A LOWER EXTENT, AT THE OREGON
CASCADES. HEAVIER SNOW BANDS ARE COUPLED WITH LOWER VISIBILITY,
BRINGING FREEZING FOG CONDITIONS ACROSS PARTS OF THE WA CASCADE
CREST, THUS A FREEZING FOG ADVISORY WAS ISSUED THROUGH LATE
MORNING MONDAY. WE'LL CONTINUE TO SEE CHANCES OF MOUNTAIN SNOW
SHOWERS UNTIL THEY TAPER DOWN BY WEDNESDAY EVENING. UNTIL THEN,
WE'LL SEE AN ADDITIONAL 4 TO 8 INCHES AROUND THE PASS LEVELS AND
AN ADDITIONAL 14 TO 20 INCHES AREA ABOVE 5000 FEET (70 TO 80
PERCENT CHANCE) FOR THE WASHINGTON CASCADE CREST REGION. GIVEN SNOW
FALL RATES WILL DROP TO A HALF INCH TO AN INCH BY THE LATE
AFTERNOON HOURS, THE WINTER WEATHER ADVISORY WAS EXTENDED UNTIL
1 PM THIS AFTERNOON.
GOING FORWARD, A STATIONARY FRONT WILL SET-UP TUESDAY UNTIL IT
PASSES AS A COLD FRONT BY WEDNESDAY, ALLOWING CHANCES FOR
MODERATE TO HEAVY RAIN TO INCREASE ACROSS THE COLUMBIA BASIN
AND INTO CENTRAL OREGON. SIX-HOUR QPF AMOUNTS ADVERTISE ANYWHERE
FROM .15" TO UPWARDS OF .25", WITH THE HEAVIEST RAIN EXPECTED
OVERNIGHT MONDAY INTO TUESDAY, WITH RAIN RATE DROPPING DOWN IN
THE LATE AFTERNOON HOURS. THE PATTERN SHIFTS TO A MORE DRY,
WARMER PATTERN AS THE PATTERN SHIFTS MORE ZONAL WITH A WEAK
RIDGE MOVING JUST SOUTH OF OREGON THROUGH THE WEEKEND. DRIER
PATTERN IS EXPECTED TO CONTINUE FOR THE LOWER ELEVATIONS AS
CHANCES OF LIGHT MOUNTAIN SNOW REMAINS THROUGH NEXT WEEK.
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
CEILINGS MIGHT BE PROBLEMATIC AT DLS WHERE PERIODS OF A BKN
LAYER AROUND 600 FT WANTS TO REDEVELOP AT TIMES TODAY.
OTHERWISE, THE BULK OF THE TERMINALS WILL SEE VFR CEILINGS AND
MVFR CATEGORY VISIBILITY AT TIMES IN ENHANCED RAINFALL RATES AND
A LIGHT SOUTHWESTERLY SURFACE FLOW. A DIURNAL DETERIORATION OF
CEILINGS AND VISIBILITY TO THE IFR CATEGORY IS EXPECTED AFTER
ABOUT 6Z AT ALL TERMINALS, WITH THE EXCEPTIONS OF RDM AND BDN.
PRELIMINARY POINT TEMPS/POPS
PDT 38 47 35 49 / 100 90 70 20
ALW 38 46 36 50 / 90 90 80 30
PSC 38 47 34 54 / 90 80 40 10
YKM 33 43 29 50 / 70 70 40 10
HRI 38 47 35 54 / 90 90 50 10
ELN 30 39 28 45 / 50 60 40 20
RDM 36 53 29 47 / 100 90 40 10
LGD 38 49 34 46 / 100 100 90 40
GCD 39 51 34 44 / 100 100 80 20
DLS 38 47 36 52 / 90 90 60 30
PDT WATCHES/WARNINGS/ADVISORIES
WA...WINTER WEATHER ADVISORY UNTIL 1 PM PST THIS AFTERNOON FOR
WAZ522.
OR...NONE.
DISCUSSION...95
AVIATION...71
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