438
FXUS66 KPDT 311729
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1029 AM PDT SUN MAY 31 2026
KEY MESSAGES
- DRY CONDITIONS AND WARMING TEMPERATURES INTO THE MIDDLE OF THE
WEEK
- MOUNTAIN SHOWERS AND THUNDERSTORMS RETURN WEDNESDAY, THEN
POTENTIALLY FRIDAY INTO THE WEEKEND
DISCUSSION
TODAY THROUGH EARLY WEDNESDAY: WATER VAPOR
SATELLITE IMAGERY TONIGHT SHOWS THE UPPER TROUGH OVER THE
NORTHERN ROCKIES, WITH NIGHTTIME SATELLITE IMAGERY SHOWING HIGH
CLOUD DECKS OVER FAR NORTHEAST OR AND SOUTHEAST WA.
THE TREND AMONGST ENSEMBLE AND DETERMINISTIC GUIDANCE TODAY IS
FOR A WEAK, BROAD AREA OF LOW PRESSURE TO DEVELOP OVER THE
NORTHERN ROCKIES WITH A RIDGE BUILDING OFFSHORE THE
PACNW. TUESDAY THROUGH EARLY WEDNESDAY, THE RIDGE WILL SLIDE
OVER THE PACNW, BRINGING TEMPERATURES INTO THE UPPER 70S TO MID
80S IN THE LOWER ELEVATIONS. OTHERWISE, CONDITIONS WILL REMAIN
DRY WITH LOCALLY BREEZY AFTERNOON WINDS.
WEDNESDAY THROUGH SATURDAY: ENSEMBLE GUIDANCE IS IN GOOD
AGREEMENT OF AN UPPER SHORTWAVE TROUGH SLIDING ACROSS THE PACNW
WEDNESDAY, THOUGH THERE REMAINS SOME UNCERTAINTY IN TIMING AND
STRENGTH OF THIS FEATURE. WHILE THE MAIN CONSENSUS IS FOR A
RETURN OF MOUNTAIN SHOWERS AND BREEZY LOWLAND WINDS INTO
THURSDAY MORNING, SOME SOLUTIONS (22% OF MEMBERS) FAVOR A
STRONGER SHORTWAVE THAT WILL BRING AREA WIDE SHOWERS THAT WILL
PERSIST THROUGH THURSDAY AFTERNOON. OTHERWISE, THIS PATTERN
WOULD ALSO FAVOR A RETURN OF AFTERNOON/EVENING ISOLATED
THUNDERSTORMS OVER THE MOUNTAIN AREAS WEDNESDAY.
DRY CONDITIONS WILL RETURN TO THE AREA AFTER THE SHORTWAVE EXIT
THURSDAY, BUT BREEZY TO LOCALLY GUSTY CASCADE GAP WINDS WILL
PERSIST(CONFIDENCE 45-60%). ENSEMBLE GUIDANCE IS IN AGREEMENT
THAT AN UPPER LOW WILL ARRIVE OFFSHORE THE PACNW FRIDAY THEN
PUSH INLAND SOMETIME SATURDAY, THOUGH THERE IS UNCERTAINTY IN
TIMING. THAT SAID, THE TREND AMONGST ENSEMBLES IS THAT THE
UPPER LOW WILL PRODUCE SHOWERS ACROSS THE CASCADES FRIDAY
AFTERNOON AND OVERNIGHT, WITH SHOWERS SPREADING TO THE EASTERN
MOUNTAINS SOMETIME SATURDAY (CONFIDENCE 40-60%). OTHERWISE, THE
UPPER LOW ARRIVAL AND SUBSEQUENT PASSAGE WILL PRODUCE BREEZY
WINDS ACROSS THE LOWER THE ELEVATIONS (CONFIDENCE 45-65%).
LAWHORN/82
AVIATION /18Z TAFS THROUGH 18Z MONDAY/
VFR CONDITIONS PREVAIL WITH DRY WEATHER THROUGH THE TAF PERIOD.
WINDS REMAIN LIGHT AND VARIABLE WITH WIND MOSTLY 12 KNOTS OR
LESS AT ALL SITES WITH THE EXCEPTION OF THE DLS EXPERIENCING
10-20 KNOT WINDS.
PRELIMINARY POINT TEMPS/POPS
PDT 71 45 76 48 / 0 0 0 0
ALW 72 50 76 51 / 0 0 0 0
PSC 77 48 80 51 / 0 0 0 0
YKM 77 48 81 52 / 0 0 0 0
HRI 75 46 80 50 / 0 0 0 0
ELN 71 45 76 48 / 0 0 0 0
RDM 67 34 74 41 / 0 0 0 0
LGD 68 41 73 44 / 0 0 0 0
GCD 70 37 75 42 / 0 0 0 0
DLS 76 49 83 57 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...82
AVIATION...95
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page