517
FXUS66 KPDT 232219
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
219 PM PST MON FEB 23 2026
KEY MESSAGES
- PRECIPITATION WILL LINGER THROUGH TUESDAY.
- DRY WEATHER WITH WARMER TEMPERATURES FROM MIDWEEK ONWARD.
- ANOTHER SYSTEM IS POSSIBLE NEXT WEEKEND.
DISCUSSION
SOUTHWESTERLY FLOW WILL KEEP MOISTURE FLOWING OVER THE REGION
THROUGH EARLY TUESDAY. THIS WILL BRING RAIN TO THE LOWER
ELEVATIONS AND SNOW TO THE MOUNTAINS. LIQUID EQUIVALENT QPF IS
ABOUT 0.25 TO 0.50 INCHES OVERNIGHT INTO TUESDAY MORNING IN THE
LOWER ELEVATIONS AND UPWARDS OF AN INCH IN SOME OF THE MOUNTAIN
AREAS.
SNOW LEVELS WILL BE RISING TO OVER 7000 FEET IN THE OREGON
CASCADES AND TO ABOVE 6500 FEET IN THE BLUE MOUNTAINS. LEVELS
WILL RANGE FROM 2500 FEET TO AROUND 5000 FEET IN THE WASHINGTON
CASCADES. ANY SNOW THAT DOES FALL HAS BEEN HARD PRESSED TO
ACCUMULATE ON ROAD SURFACES DUE TO WARM DAYTIME TEMPERATURES AND
MARGINAL OVERNIGHT TEMPERATURES. RISING SNOW LEVELS AND
CONTINUED MARGINAL TEMPERATURES SHOULD CONTINUE THIS TREND. ANY
ACCUMULATIONS AT PASS LEVEL SHOULD BE MINIMAL, WITH HIGHER
AMOUNTS AT THE CRESTS.
ECMWF EFI QPF IS 80TH TO 90TH PERCENTILE THROUGH TUESDAY ACROSS
PORTIONS OF THE COLUMBIA BASIN, BLUE MOUNTAIN FOOTHILLS AND
BLUE MOUNTAINS. WHILE AMOUNTS ARE NOT ALL THAT HIGH, EXCEPT FOR
THE BLUE MOUNTAINS, THE NORMALS ARE LOW ENOUGH TO ACCOUNT FOR
THESE ANOMALIES.
AFTER TUESDAY, THE FLOW BECOMES MORE ZONAL, THEN A RIDGE BUILDS
IN AND PRECIPITATION ENDS AND TEMPERATURES WILL WARM INTO THE
MID TO UPPER 50S IN THE LOWER ELEVATIONS AND 60 DEGREES CAN NOT
BE RULED OUT.
BREEZY CONDITIONS ARE EXPECTED TO DEVELOP WEDNESDAY AFTERNOON
ACROSS PORTIONS OF THE COLUMBIA BASIN AND THE FOOTHILLS OF THE
BLUE MOUNTAINS. WINDS MAY GUST TO THE 30 TO 35 MPH RANGE. AT
THIS TIME, NO WIND HEADLINES ARE ANTICIPATED.
OVER THE WEEKEND, ANOTHER SYSTEM IS POSSIBLE WHICH COULD BRING
MORE MOUNTAIN SNOW AND LOWER ELEVATION RAIN, BUT GUIDANCE IS IN
CONSIDERABLE AGREEMENT AT THIS POINT.
AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/
CEILINGS ARE EXPECTED TO GRADUALLY DETERIORATE, ESPECIALLY
OVERNIGHT AS PRECIPITATION WINDS DOWN ACROSS THE LOW LANDS AND
DEW POINT DEPRESSIONS DROP. NBM DEVELOPS THE GREATEST RISK FOR
IFR TO VLIFR CEILINGS AND VISIBILITY DUE TO DENSE FOG IN THE YKM
AND PSC/ALW/PDT AREAS. RDM AND BDN COULD SEE IFR CEILINGS AS
WELL OVERNIGHT AND INTO TUESDAY MORNING. LIGHT AND VARIABLE
WINDS.
PRELIMINARY POINT TEMPS/POPS
PDT 39 45 34 49 / 100 100 70 10
ALW 39 45 34 49 / 100 100 80 20
PSC 38 46 34 54 / 90 90 40 10
YKM 34 43 29 49 / 90 70 30 0
HRI 39 46 34 52 / 100 90 50 10
ELN 31 39 28 44 / 70 60 40 10
RDM 37 54 29 46 / 100 90 50 10
LGD 39 49 34 45 / 100 100 90 30
GCD 39 49 34 44 / 100 100 70 20
DLS 39 46 36 51 / 100 90 60 20
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...77
AVIATION...71
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