532
FXUS66 KPDT 301739
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1039 AM PDT WED SEP 30 2026
KEY MESSAGES
- UPPER LEVEL HIGH PRESSURE BUILDING OVER THE REGION THROUGH
NEXT WEEK, WITH DRY CONDITIONS PREVAILING
- NEAR NORMAL TEMPERATURES TODAY, BECOMING ABOVE NORMAL THROUGH
THE REMAINDER OF THE FORECAST PERIOD
- LIGHT, DIURNALLY DRIVEN WINDS WILL PREVAIL EACH DAY
DISCUSSION
NIGHTTIME SATELLITE IMAGERY TONIGHT SHOWS MOSTLY CLEAR SKIES
ACROSS THE FORECAST AREA, WITH AREAS OF STRATUS ALONG THE WA
CASCADE EAST SLOPES AND NORTHERN BLUE MTNS/FOOTHILLS. OF NOTE,
SATELLITE IMAGERY SHOWS A COUPLE OF HOT SPOTS ALONG THE SOUTHERN
AND EASTERN WALLA WALLA COUNTY BORDER, WITH THE
BRIGHTEST/BIGGEST JUST EAST OF WALLULA GAP.
BREEZY SOUTHWEST WINDS CONTINUE ALONG PORTIONS OF THE HORSE
HEAVEN HILLS TONIGHT, WHILE MORE ISOLATED BREEZY CONDITIONS ARE
OCCURRING IN WIND PRONE AREAS OF THE COLUMBIA BASIN AND KITTITAS
VALLEY. WINDS WILL CONTINUE TO WEAKEN TONIGHT BEHIND THE
PASSAGE OF A COLD FRONT BOUNDARY AND UPPER SHORTWAVE TROUGH TO
THE NORTH.
FOR THE NEXT WEEK, ENSEMBLE AND DETERMINISTIC MODEL GUIDANCE ARE
IN GREAT AGREEMENT IN THE PACNW BEING UNDER THE INFLUENCE OF
UPPER LEVEL RIDGING. 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
65-75%). MEANWHILE, THE UPPER LEVEL RIDGE WILL AMPLIFY OVER THE
EASTERN PACIFIC DURING THIS PERIOD, THEN SLIDE INLAND OVER THE
WEEKEND (CONFIDENCE 60-75%). MONDAY AND TUESDAY, THE RIDGE AXIS
WILL PUSH EAST OF THE PACNW, BUT THE REGION WILL REMAIN UNDER
THE INFLUENCE OF THE HIGH PRESSURE ALOFT (CONFIDENCE 60-70%).
DURING THIS PERIOD, TEMPERATURES WILL BE ON A GRADUAL INCREASE,
WITH PEAK AFTERNOON TEMPERATURES IN THE UPPER 70S TO MID 80S
MONDAY (CONFIDENCE 60-75%). OVERALL, CONDITIONS ARE EXPECTED TO
REMAIN DRY INTO MIDDLE OF NEXT WEEK WITH LIGHT, DIURNALLY DRIVEN
WINDS EACH DAY. LAWHORN/82
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/
VFR CONDITIONS ARE FORECAST THROUGH THE PERIOD, THOUGH LOW
STRATUS DRAPED OVER NORTH-CENTRAL TO NORTHEAST OREGON AND SOUTH-
CENTRAL TO SOUTHEAST WASHINGTON WILL PRESENT LOW (30% OR LESS)
CHANCES OF MVFR CIGS AT PDT/ALW THROUGH MORNING. THE BASE OF
THE STRATUS DECK SHOULD CONTINUE TO RISE TO 4-5 KFT AGL THROUGH
AFTERNOON AND GRADUALLY DISSIPATE. WINDS WILL BE PREDOMINANTLY
LIGHT AND DIURNALLY DRIVEN, SUSTAINED AT 10 KTS OR LESS.
PRELIMINARY POINT TEMPS/POPS
PDT 72 46 74 46 / 0 0 0 0
ALW 72 49 75 51 / 0 0 0 0
PSC 75 48 77 49 / 0 0 0 0
YKM 73 49 74 50 / 0 0 0 0
HRI 75 48 76 49 / 0 0 0 0
ELN 67 43 69 46 / 0 0 0 0
RDM 76 42 78 43 / 0 0 0 0
LGD 71 45 76 48 / 0 0 0 0
GCD 75 45 80 48 / 0 0 0 0
DLS 78 52 80 55 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...82
AVIATION...86
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