577
FXUS66 KPDT 081824
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1024 AM PST SUN FEB 8 2026
.UPDATED AVIATION DISCUSSION.
DISCUSSION
SATELLITE AND RADAR IMAGERY TONIGHT SHOW A FRONTAL
BOUNDARY IN THE PROCESS OF STALLING ACROSS THE PACNW, WITH AN
ASSOCIATED BAND OF PRECIP DRAPED FROM SOUTHWEST OR TO SOUTHEAST
WA. NORTH OF THIS BAND, AREAS OF LOW STRATUS ALONG THE WA
CASCADE EAST SLOPES AND IN THE YAKIMA/KITTITAS VALLEYS HAS
MANAGED TO SURVIVE AN EARLIER FRONTAL PASSAGE, AND ARE EXPECTED
TO PERSIST IN THESE AREAS THROUGH THE MORNING. OTHERWISE, LIGHT
TO MODERATE BAND OF RAIN WILL CONTINUE TO FALL ALONG THE STALLED
FRONT.
TODAY THROUGH MONDAY: PRECIPITATION CHANCES WILL CONTINUE ACROSS
THE FORECAST AREA TODAY AS A STALLED COLD FRONT WILL TAP INTO
AN ACCOMPANYING WEAK PLUME OF MOISTURE. SNOW LEVELS WILL REMAIN
ABOVE 5.5KFT THROUGH THIS MORNING, RESULTING IN MOSTLY RAIN
FALLING BELOW THE HIGHEST PEAKS ACROSS THE OR CASCADES AND THE
EASTERN MOUNTAINS. BANDS OF RAIN WILL ALSO CONTINUE TO DEVELOP
ACROSS THE LOWER ELEVATIONS OF OR AND FAR SOUTHEAST WA
THROUGHOUT THIS MORNING AND THE REMAINDER OF TODAY. A SHORTWAVE
ARRIVING TO THE REGION THE LATTER HALF OF TODAY WILL PULL THE
STALLED FRONTAL BOUNDARY NORTH WHILE DROPPING SNOW LEVELS TO
3KFT TO 4.5KFT BY TONIGHT. THIS WILL RESULT IN THE BEST CHANCE
OF SNOW ACCUMULATIONS ACROSS THE CASCADES AND BLUES THROUGH
MONDAY, WITH NBM CHANCES OF 6 INCHES OF SNOW BETWEEN 50-75% FOR
THE BLUES AND OR CASCADES ABOVE 4.5KFT. OTHERWISE, SNOW AMOUNTS
WILL REMAIN QUITE MEAGER FOR THE WA CASCADES, WITH ONLY A 20-40%
CHANCE OF 3 INCHES OF SNOW ACCUMULATIONS. PRIOR TO THE CHANGE
OVER TO SNOW, THERE IS A 75-95% CHANCE OF AT LEAST 0.5 INCHES OF
RAINFALL ACROSS THE BLUES AND THE OR CASCADES. THIS WILL RESULT
IN RISES IN RIVERS/STREAMS IN THE ASSOCIATED DRAINAGE BASINS,
THOUGH AT THIS TIME ALL RIVER FORECASTS REMAIN BELOW ACTION
STAGE.
THE INCOMING SHORTWAVE TODAY WILL PRODUCE BREEZY WINDS IN THE
LOWER ELEVATIONS AND ALONG EXPOSED RIDGES, WITH WIND GUSTS
BETWEEN 25 TO 40 MPH DEVELOPING THIS AFTERNOON THROUGH MONDAY
MORNING.
LIGHT SNOW WILL CONTINUE ACROSS THE CASCADE CREST AND THE
INTERIOR NORTHERN BLUES AS FLOW ALOFT BECOMES ZONAL BRIEFLY
EARLY MONDAY. BY MONDAY EVENING, FLOW ALOFT WILL TRANSITION INTO
A SPLIT FLOW THAT WILL BRING DRY CONDITIONS ACROSS MOST OF THE
REGION.
TUESDAY THROUGH THURSDAY: ENSEMBLE CLUSTER GUIDANCE INDICATES
THAT THE SPLIT FLOW PATTERN WILL PERSIST THROUGH LATE WEDNESDAY,
WITH TRANSIENT RIDGING NOW DEVELOPING ACROSS THE REGION BY EARLY
THURSDAY. MUCH OF THE FORECAST AREA WILL REMAIN DRY UNDER THIS
PATTERN, HOWEVER, CLUSTER AND ENSEMBLE SOLUTIONS SHOW MOISTURE
ROUNDING A LOW TO THE SOUTH AND CLIPPING PORTIONS OF CENTRAL OR,
OCHOCO-JOHN DAY HIGHLANDS, AND THE STRAWBERRYS/ELKHORNS/WALLOWAS
TUESDAY NIGHT AND WEDNESDAY MORNING. SNOW LEVELS WILL BE LOW
ENOUGH TUESDAY NIGHT FOR LIGHT SNOW ACCUMULATIONS ACROSS THESE
AREAS.
FRIDAY AND SATURDAY: BY EARLY FRIDAY, ENSEMBLE CLUSTER SOLUTIONS
SHOW A TROUGH DROPPING OUT OF THE GULF OF ALASKA AND SETTING UP
OFFSHORE THE PACNW. HOWEVER, THERE REMAINS DISAGREEMENT IN THE
STRENGTH OF POSITION OF THE APPROACHING TROUGH INTO THE WEEKEND.
CONFIDENCE REMAINS MODERATE (50-65%) IN AT LEAST LIGHT TO
MODERATE SNOW IN THE MOUNTAINS WITH MOSTLY LIGHT RAIN AND
OVERNIGHT RAIN/SNOW MIXES IN THE LOWER ELEVATIONS. LAWHORN/82
AVIATION /18Z TAFS THROUGH 18Z MONDAY/
VARIABLE CONDITIONS
ACROSS ALL SITES, WITH VFR AT KRDM/KBDN/KYKM AND MVFR AT
KDLS/KPDT/KALW/KPSC DUE TO REDUCED CEILINGS OF 2-3KFT AND
VISIBILITIES OF 3SM AT KDLS. LIGHT RAIN IS CURRENTLY IMPACTING
ALL SITES, WHICH WILL LINGER THROUGH MUCH OF THE DAY BEFORE
TAPERING OFF LATE THIS EVENING. AS A RESULT, MVFR CONDITIONS ARE
EXPECTED TO PERSIST TODAY AND IMPROVE TO VFR OVERNIGHT AS
CEILINGS LIFT TO 5-15KFT. WINDS WILL STAY LIGHT AND BELOW 10KTS
THROUGH MUCH OF THE PERIOD, BUT INCREASE TO 10-15KTS FOR KPSC
AND KALW TOWARD THE END OF THE PERIOD. 75
PRELIMINARY POINT TEMPS/POPS
PDT 35 49 30 46 / 100 30 0 0
ALW 37 49 32 47 / 100 40 0 0
PSC 36 54 30 49 / 90 10 0 0
YKM 31 50 28 46 / 70 10 0 0
HRI 36 53 29 46 / 90 20 0 0
ELN 31 45 27 42 / 50 20 0 0
RDM 27 45 23 46 / 60 0 0 0
LGD 33 45 26 46 / 100 50 0 0
GCD 33 43 26 46 / 90 10 0 10
DLS 38 51 34 48 / 80 20 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...82
AVIATION...75
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page