958
FXUS66 KPDT 270949
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
249 AM PDT MON OCT 27 2025
KEY POINTS
1. LINGERING MOUNTAIN SNOW
2. MOSTLY DRY CONDITIONS RETURN TO LOW ELEVATIONS
3. PRECIPITATION WILL RETURN THIS WEEKEND
DISCUSSION...TODAY THROUGH THURSDAY
CURRENT RADAR SHOWS THE
PSCZ HAS DISSIPATED. HOWEVER, THERE ARE STILL SOME SNOW SHOWERS
OVER THE WA CASCADES. CAMERAS ALONG THE I-90 AND OVER SANTIAM PASS
SHOWS SNOW IS STILL ONGOING. SNOW OVER THE I-84 CORRIDOR AND UP
THROUGH TOLLGATE AND SKI BLUEWOOD HAS TAPERED OFF SINCE EARLIER
IN THE PERIOD. LINGERING SNOW SHOWERS ARE EXPECTED TO CONTINUE
THROUGH THE MORNING, HOWEVER, ACCUMULATIONS WILL BE LIGHT WITH
60-80% PROBABILITIES OF AN ADDITIONAL 2 INCHES ACCUMULATING
THROUGH LATE MONDAY MORNING.
MODELS SHOW THAT ONCE THIS SHORTWAVE MOVES ACROSS, THE LEADING
EDGE OF AN UPPER LEVEL RIDGE WILL BEGIN TO MOVE INTO THE REGION.
NORTHWEST FLOW ALOFT WILL REPLACE THE SOUTHWEST FLOW AND
PRECIPITATION WILL MAINLY LINGER ACROSS THE MOUNTAINS WITH
UPSLOPE FLOW. WITH THE INCOMING RIDGE, NBM SHOWS SNOW LEVELS TO
STEADILY INCREASE AND TEMPERATURES TO WARM ENOUGH THAT THE
PRECIPITATION THAT LINGERS THROUGH MONDAY WILL BE A RAIN SNOW MIX
AND THEN MAINLY RAIN TUESDAY. RAW ENSEMBLES SHOW 80%
PROBABILITIES OF MOUNTAIN PRECIPITATION TO ACCUMULATE 0.10 INCHES
OF PRECIPITATION WITH 50-60% SHOWING UP TO 0.50 INCHES ON
TUESDAY. BY TUESDAY AFTERNOON, THE AXIS OF THE UPPER LEVEL RIDGE
WILL BE MOSTLY OVERHEAD ALLOWING FOR DRY CONDITIONS TO PERSIST
ACROSS THE REGION THROUGH THURSDAY.
FRIDAY ONWARD...CONFIDENCE IN THE NEXT ROUND OF PRECIPITATION IS
MODERATE (40-60%) AS MODELS SHOW THE UPPER LEVEL RIDGE TO BEGIN
FLATTENING AS AN UPPER LEVEL TROUGH BEGINS TO PUSH IN OFF THE
COAST OF BC. THIS WILL BRING ANOTHER ROUND OF WIDESPREAD
PRECIPITATION AS WELL AS ANOTHER ROUND OF MOUNTAIN SNOW. 90
AVIATION...06Z TAFS
VFR CONDITIONS ARE EXPECTED THROUGH THE
PERIOD. LOW SCT-BKN CIGS WILL GRADUALLY CLEAR OUT HEADING INTO
MONDAY MORNING, LEAVING ALL SITES WITH PERSISTENT WESTERLY WINDS
LESS THAN 15 KTS. 74
PRELIMINARY POINT TEMPS/POPS
PDT 54 30 56 37 / 10 0 0 10
ALW 53 35 55 41 / 20 0 0 20
PSC 58 28 52 35 / 10 0 0 20
YKM 55 29 50 33 / 0 0 10 40
HRI 56 29 54 36 / 10 0 0 10
ELN 50 25 47 31 / 10 0 20 60
RDM 50 24 61 34 / 0 0 0 20
LGD 48 26 52 36 / 30 0 0 10
GCD 48 26 57 32 / 0 0 0 0
DLS 56 36 55 41 / 30 10 10 60
PDT WATCHES/WARNINGS/ADVISORIES
OR...WINTER WEATHER ADVISORY UNTIL 8 AM PDT THIS MORNING FOR ORZ502.
WINTER WEATHER ADVISORY UNTIL 5 AM PDT EARLY THIS MORNING FOR
ORZ509.
WA...WINTER WEATHER ADVISORY UNTIL 8 AM PDT THIS MORNING FOR WAZ030.
WINTER WEATHER ADVISORY UNTIL 5 AM PDT EARLY THIS MORNING FOR
WAZ522.
SHORT TERM...90
LONG TERM....90
AVIATION...74
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