831
FXUS66 KPDT 261140
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
440 AM PDT SUN OCT 26 2025
UPDATED FOR AVIATION
AVIATION
12Z TAFS...VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD.
ANOTHER ROUND OF RA IS EXPECTED THIS AFTERNOON. IF THE RA IS HEAVY
ENOUGH THERE COULD BE LOCAL REDUCED CONDITIONS.
WINDS WILL GUST TO AROUND 20 TO 25 KTS THIS AFTERNOON THROUGH
EVENING.
PREV DISCUSSION
KEY POINTS
1. MOUNTAIN SNOW AND WIDESPREAD RAIN TODAY
2. BREEZY CONDITIONS THROUGH THE AFTERNOON
3. RETURN TO DRIER CONDITIONS LATER IN THE WEEK
DISCUSSION...TODAY THROUGH MONDAY...CURRENT RADAR SHOWS SHOWERS
MOSTLY OVER THE CASCADES THIS MORNING WITH GROUND OBSERVATIONS
SHOWING UPWARDS OF 0.06 INCHES OF IN THE LAT 3 HOURS.
LOOKING AT WEB CAMERAS ALONG THE I-90 CORRIDOR, A FEW CAMERAS SHOW
LIGHT SNOW FALLING WHILE THOSE ALONG THE EASTER SLOPES SHOW MAINLY
RAIN.
SNOW WILL CONTINUE THROUGH THE EVENING WITH RAW ENSEMBLES SHOWING
OVER 80% PROBABILITIES OF ACCUMULATION AMOUNTS NEARING 6 TO 8 INCHES
ABOVE 3500 FEET, LIKE ACROSS SANTIAM AND WHITE PASSES, WHILE
SNOQUALMIE PASS WILL SEE 45-65% PROBABILITIES OF 2 INCHES THROUGH 11
PM TONIGHT AN INTO MONDAY. SNOW LEVELS WILL CONTINUE TO DECREASE
THROUGH THE MORNING WITH SOME AREAS SEEING SNOW LEVELS DROP TO 3000
FT (KITTITAS VALLEY). MODELS SHOW THE SYSTEM TO CONTINUE TO PUSH
SHORTWAVES ACROSS THE AREA WHICH WILL CONTINUE TO BRING MOUNTAIN
SNOW SHOWERS. MODELS SHOW PRECIPITATION TO CONTINUE MOVING EAST
BRINGING MORE PRECIPITATION TO THE LOWER ELEVATIONS. RAW ENSEMBLES
SHOW THAT PORTIONS OF THE BASIN, SOUTHERN BLUE MOUNTAIN FOOTHILLS
AND CENTRAL OR WILL SEE LIGHT PRECIPITATION UNDER 0.05 INCHES WHILE
THE REMAINING AREAS WILL SEE 80% PROBABILITIES OF 0.05-0.10 WITH
SOME ISOLATED LOCATIONS ALONG THE FOOTHILLS OF THE NORTHERN BLUES
SEEING UP TO 0.20 INCHES THROUGH THE DAY TODAY.
WHILE WINDS WILL CONTINUE TO BE A BIT ON THE BREEZY SIDE ACROSS MANY
AREAS, THE MAJORITY OF THE REGION WILL SEE SUSTAINED WINDS BELOW 15
TO 20 MPH WITH GUSTS 25 TO 30 MPH. MODELS SHOW THE TROUGH HAS
FLATTENED TO A BIT MORE NORTHWEST TO ZONAL FLOW WITH AN EASING TO
THE PRESSURE GRADIENTS WHICH IS ALLOWING WINDS TO SETTLE THROUGH
TODAY. MODELS CONTINUE TO SHOW A SLIGHT NORTHWEST FLOW SETTLING OVER
THE REGION MONDAY AHEAD OF A RIDGING PATTERN.
MONDAY NIGHT THROUGH THURSDAY...MODELS ARE IN RELATIVELY FIRM
AGREEMENT WITH AN UPPER LEVEL RIDGE MAKING ITS WAY OVER THE REGION.
WITH THE LEADING EDGE OF THE UPPER LEVEL RIDGE MOVING INTO THE AREA
MONDAY, THERE IS MODERATELY HIGH CONFIDENCE (65-85%) THAT ACTIVE
WEATHER WILL BREAK WAY TO A DRY CONDITIONS FOR THE MAJORITY OF THE
REGION. LINGERING LIGHT SHOWERS WILL REMAIN THROUGH WEDNESDAY FOR
MOUNTAIN SNOW AS MODELS SHOW PRECIPITATION LINGERING ALONG THE REAR
OF THE RIDGE. ENSEMBLES SHOW 2-4 INCHES ALONG THE RIDGETOPS FOR
MONDAY, LESS THAN 1 INCH WEDNESDAY.
FRIDAY THROUGH THE WEEKEND...MODELS SHOW AN ACTIVE WEATHER PATTERN
COULD GRACE THE REGION AGAIN BEGINNING SATURDAY. HOWEVER, CONFIDENCE
PRELIMINARY POINT TEMPS/POPS
PDT 57 34 54 32 / 70 50 10 10
ALW 57 38 54 36 / 70 70 20 10
PSC 57 35 58 30 / 60 30 0 10
YKM 51 29 54 30 / 80 20 10 10
HRI 57 36 57 32 / 70 30 0 10
ELN 46 27 50 27 / 80 40 10 20
RDM 50 24 51 25 / 80 20 10 10
LGD 52 32 49 27 / 70 90 20 10
GCD 51 30 48 27 / 80 60 0 10
DLS 54 39 57 38 / 90 40 20 20
PDT WATCHES/WARNINGS/ADVISORIES
OR...WIND ADVISORY UNTIL 5 AM PDT EARLY THIS MORNING FOR ORZ041-044-
507.
WINTER WEATHER ADVISORY FROM 8 AM THIS MORNING TO 8 AM PDT
MONDAY FOR ORZ502.
WINTER WEATHER ADVISORY UNTIL 2 AM PDT MONDAY FOR ORZ509.
WA...WIND ADVISORY UNTIL 5 AM PDT EARLY THIS MORNING FOR WAZ024-
027>029-521.
WINTER WEATHER ADVISORY FROM 8 AM THIS MORNING TO 8 AM PDT
MONDAY FOR WAZ030.
WINTER WEATHER ADVISORY UNTIL 11 PM PDT THIS EVENING FOR WAZ522.
SHORT TERM...90
LONG TERM....90
AVIATION...77
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