385
FXUS66 KPDT 261753
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1053 AM PDT SUN OCT 26 2025
AVIATION...18Z TAFS
PREDOMINANTLY VFR CONDITIONS ARE LIKELY (70
PERCENT CHANCE OR GREATER) FOR TAF SITES THROUGH THE NEXT 24 HRS.
RAIN SHOWERS AND PERIODS OF BKN-OVC SKIES ARE LIKELY (50 PERCENT
CHANCE OR GREATER) AT ALL SITES LATER THIS MORNING INTO THE
EVENING AS A WEATHER SYSTEM MOVES EAST ACROSS THE FORECAST AREA.
CONFIDENCE IN SUB-VFR CONDITIONS DUE TO VSBY OR CIG REDUCTIONS IS
LOW (30 PERCENT OR LESS), WITH HIGHEST CHANCES AT ALW THIS EVENING
DUE TO UPSLOPE STRATUS.
WINDS WILL BECOME BREEZY THIS AFTERNOON, SUSTAINED 10-15 KTS WITH
GUSTS UP TO 25 KTS AT MOST SITES.
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.
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...WINTER WEATHER ADVISORY UNTIL 8 AM PDT MONDAY FOR ORZ502.
WINTER WEATHER ADVISORY UNTIL 2 AM PDT MONDAY FOR ORZ509.
WA...WINTER WEATHER ADVISORY UNTIL 8 AM PDT MONDAY FOR WAZ030.
WINTER WEATHER ADVISORY UNTIL 11 PM PDT THIS EVENING FOR WAZ522.
SHORT TERM...90
LONG TERM....90
AVIATION...86
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page