221
FXUS66 KPDT 010759
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1259 AM PDT THU OCT 1 2026
KEY MESSAGES
- UPPER LEVEL HIGH PRESSURE BUILDING OVER THE REGION THROUGH
NEXT WEEK, WITH DRY CONDITIONS PREVAILING
- TEMPERATURES BEGIN TO SLOWLY INCREASE TODAY, WITH PEAK
TEMPERATURES EXPECTED EARLY NEXT WEEK (TEMPERATURES 5 TO 15
DEGREES ABOVE NORMAL)
- LIGHT, DIURNALLY DRIVEN WINDS WILL PREVAIL EACH DAY
DISCUSSION
NIGHTTIME SATELLITE IMAGERY TONIGHT SHOWS DECKS OF
CIRRUS MOVING EAST ACROSS THE NORTHERN TWO-THIRDS OF THE
FORECAST AREA, WHILE MID LEVEL STRATUS OVER THE YAKIMA/KITTITAS
VALLEYS PEAKS THROUGH BREAKS IN THE CIRRUS.
THROUGH THE MIDDLE OF NEXT WEEK, ENSEMBLE AND DETERMINISTIC
MODEL GUIDANCE STAY IN GREAT AGREEMENT OF THE PACNW REMAINING
UNDER THE INFLUENCE OF UPPER LEVEL RIDGING OR ZONAL FLOW ALOFT.
THROUGH FRIDAY NIGHT, THE UPPER LEVEL RIDGE WILL REMAIN QUITE
FLAT OVER THE PACNW DUE TO SEPARATE SHORTWAVE PASSAGES THROUGH
SOUTHERN BC THURSDAY AND FRIDAY (CONFIDENCE 75-90%). MEANWHILE,
THE UPPER LEVEL RIDGE WILL AMPLIFY OVER THE EASTERN PACIFIC
DURING THIS PERIOD, THEN SLIDE INLAND OVER THE WEEKEND
(CONFIDENCE 70-85%). MONDAY THE RIDGE AXIS WILL PUSH EAST OF
THE PACNW AS AN UPPER TROUGH SLIDES INTO NORTHERN BC, WITH ZONAL
FLOW DEVELOPING OVERHEAD AND HIGH PRESSURE ALOFT TO THE SOUTH
(CONFIDENCE 65-70%). BY TUESDAY THROUGH WEDNESDAY, ENSEMBLE
GUIDANCE IS IN GREAT AGREEMENT OF UPPER LEVEL RIDGING BUILDING
BACK OVER THE PACNW THEN AMPLIFYING POLEWARD. THROUGH MONDAY,
TEMPERATURES WILL BE ON A GRADUAL INCREASE, WITH PEAK AFTERNOON
TEMPERATURES IN THE UPPER 70S TO MID 80S MONDAY (CONFIDENCE
65-75%). TEMPERATURES WILL DROP A COUPLE DEGREES INTO TUESDAY,
BUT EXPECT HIGH TEMPERATURES TO REMAIN IN THE UPPER 70S TO LOW
80S. CONDITIONS ARE EXPECTED TO REMAIN DRY INTO MIDDLE OF NEXT
WEEK WITH LIGHT, DIURNALLY DRIVEN WINDS EACH DAY. THE EXCEPTION
WILL BE MONDAY, WHERE BREEZY WINDS (15-20 MPH WITH GUSTS TO
AROUND 30 MPH) WILL DEVELOP THROUGH THE CASCADE GAPS AS SURFACE
PRESSURE GRADIENTS SLIGHTLY STRENGTHEN IN RESPONSE TO THE UPPER
TROUGH PASSING TO THE NORTH. LAWHORN/82
AVIATION /06Z TAFS THROUGH 06Z FRIDAY/
VFR CONDITIONS ARE
FORECAST THROUGH THE PERIOD. SOME MID AN HIGH LEVEL CLOUDS HAVE
MOVED OVER THE REGION OVERNIGHT AND WILL LINGER THROUGH THE
PERIOD. WINDS WILL BE PRIMARILY DIURNALLY DRIVEN WITH VARIABLE
UNDER 6KTS.
PRELIMINARY POINT TEMPS/POPS
PDT 74 46 78 48 / 0 0 0 0
ALW 75 52 78 53 / 0 0 0 0
PSC 77 46 81 47 / 0 0 0 0
YKM 74 49 80 49 / 0 0 0 0
HRI 76 46 80 49 / 0 0 0 0
ELN 69 45 75 45 / 0 0 0 0
RDM 77 41 80 41 / 0 0 0 0
LGD 76 48 81 47 / 0 0 0 0
GCD 81 47 82 47 / 0 0 0 0
DLS 80 53 83 52 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...82
AVIATION...90
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