684
FXUS66 KPDT 031125
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
425 AM PDT SAT OCT 3 2026
KEY MESSAGES
- UPPER LEVEL HIGH PRESSURE BUILDING OVER THE REGION THROUGH
NEXT WEEK, WITH DRY CONDITIONS PREVAILING
- TEMPERATURES CONTINUE TO INCREASE WITH PEAK TEMPERATURES
EXPECTED MONDAY (TEMPERATURES AROUND 15 DEGREES ABOVE NORMAL)
- MOSTLY LIGHT WINDS EACH DAY, BUT BREEZY CASCADE GAPS WINDS
WILL DEVELOP MONDAY AFTERNOON
DISCUSSION
A FEW HIGH CLOUDS WERE ALL THAT WERE FOUND ACROSS THE FORECAST
AREA THIS MORNING, MAINLY OVER THE WA CASCADES SLOPES AND
CENTRAL WA, AND GOES SATELLITE SHOWED A DEEPER LAYER OF DRY AIR
OVERSPREADING CENTRAL OREGON INTO THE EASTERN MOUNTAINS.
THE 500 MB FLOW AMPLIFIES A RIDGE ACROSS THE INTERIOR NW INTO
THE CANADIAN ROCKIES TODAY AND TONIGHT, WHICH WILL BE BRIEF AS
THE RIDGE SLIDES INTO THE CENTRAL CANADIAN PROVINCES BY SUNDAY
NIGHT. THE UPPER RIDGING THOUGH THE LATE WEEKEND WILL PROMOTE
SUBSIDENCE AND A WARMING TREND WHICH PEAKS ON MONDAY WHEN THE
LOWER COLUMBIA BASIN REACHES WIDESPREAD MID 80S. MID AND UPPER
80S WILL ALREADY BE SEEN OVER THE WEEKEND ACROSS THE CENTRAL
OREGON MOUNTAIN AND MAYBE 90 DEGREES THROUGH THE JOHN DAY
BASIN/GRANDE RONDE VALLEY. BREEZY CONDITIONS THOUGH THE GAPS
AGAIN ON MONDAY APPEAR SOMEWHAT MUTED WITH MEAN NBM ONLY AROUND
15 MPH AND A 75TH STILL BELOW 20 MPH ACROSS THE COLUMBIA RIVER
GORGE AND THE OREGON COLUMBIA BASIN.. YAKIMA/KITTITAS VALLEYS.
THURSDAY NIGHT AND FRIDAY MORNING SHOWS AND MOIRE SIGNIFICANT
RAMP UP IN THE WINDS ACROSS THESE MICROCLIMATE REGIONS, WITH 15
TO 25 MPH BEING MORE LIKELY (THE 25TH TO 75TH PERCENTILES), AND
RECURRING BREEZY CONDITIONS DIURNALLY ON SATURDAY. ADDITIONALLY,
ENSEMBLES THROUGH THE CLUSTER GUIDANCE STILL POINT TO THIS
OCTOBER 10-11TH WINDOW FOR SOME AGREEMENT ON THE NEXT CHANCES
FOR PRECIPITATION MAINLY ACROSS THE WA CASCADE CREST AND EASTERN
SLOPES, AND MUCH MORE MINOR AMOUNTS POSSIBLE ACROSS THE EASTERN
MOUNTAINS.
AVIATION /12Z TAFS THROUGH 12Z SUNDAY/
HIGH PRESSURE AND A DRY BOUNDARY LAYER WILL PROMOTE LIGHT AND
VARIABLE WINDS (UNDER 12 KNOTS), AND VFR CONDITIONS FOR ALL
TERMINALS THROUGH THE TAFS.
PRELIMINARY POINT TEMPS/POPS
PDT 79 48 79 52 / 0 0 0 0
ALW 81 53 80 58 / 0 0 0 0
PSC 82 48 81 49 / 0 0 0 0
YKM 79 50 81 51 / 0 0 0 0
HRI 81 48 81 49 / 0 0 0 0
ELN 75 48 77 51 / 0 0 0 0
RDM 82 41 86 47 / 0 0 0 0
LGD 83 49 87 52 / 0 0 0 0
GCD 88 48 91 54 / 0 0 0 0
DLS 83 55 84 56 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...71
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