148
FXUS66 KPDT 151029
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
329 AM PDT THU OCT 15 2026
KEY MESSAGES
1. DRY AND WARM CONDITIONS THROUGH THE END OF THE WEEK
2. BREEZY CONDITIONS THROUGH THE GRANDE RONDE VALLEY FRIDAY WITH
LIGHT MOUNTAIN PRECIPITATION.
3. BREEZY THROUGH THE WIND PRONE AREAS SATURDAY
DISCUSSION
CURRENT NIGHTTIME SATELLITE IS SHOWING CLEAR SKIES OVER THE REGION.
THIS WILL ALLOW FOR COOLER OVERNIGHT TEMPERATURES. TEMPERATURES WILL
BE IN THE UPPER 20S TO LOW 30S ACROSS PORTIONS OF CENTRAL OR AND THE
EASTERN MOUNTAINS IN LOCATIONS LIKE LA PINE AND SENECA. THE BASIN,
GORGE, FOOTHILLS AND YAKIMA/KITTITAS VALLEYS WILL SEE TEMPERATURES IN
THE UPPER 30S TO LOW 40S.
DETERMINISTIC MODELS ARE IN FIRM AGREEMENT WITH THE UPPER LEVEL
RIDGE REMAINING OVER THE AREA THROUGH FRIDAY AFTERNOON. TEMPERATURES
WILL PEAK ON FRIDAY WITH IN OFFICE CALCULATIONS SHOWING TEMPERATURES
TO BE NEARLY 15-20 DEGREES ABOVE SEASONAL NORMAL. LOOKING AT THE
ENSEMBLE GUIDANCE, 80-90% OF THE HREF RAW ENSEMBLES SHOW
TEMPERATURES TO BE IN THE LOW TO MID 70S THROUGH THE BASIN,
FOOTHILLS, GORGE AND YAKIMA/KITTITAS VALLEYS WHILE CENTRAL OR AND
THE JOHN DAY BASIN WILL SEE UPPER 70S WITH SOME POSSIBLE 80S MIXED
IN.
MODELS SHOW THAT FRIDAY WILL BEGIN TO SEE THE SYNOPTIC TRANSITION OF
THE UPPER LEVEL RIDGE MOVING EAST AND AN UPPER LEVEL TROUGH BUILDING
INTO THE REGION FROM THE NORTHWEST. AS THE RIDGE EXITS THE AREA, A
SURFACE HIGH WILL FORM IN TREASURE VALLEY WHILE A WEAK SURFACE LOW
WILL FORM OVER THE COLUMBIA BASIN. THIS IS THE PERFECT SYNOPTIC SET
UP FOR EASTERLY BREEZY WINDS THROUGH THE GRANDE RONDE VALLEY. WINDS
THROUGH THE AREA ARE EXPECTED TO BEGIN TO PICK AFTER MIDNIGHT
REACHING ITS PEAK AFTER 11 AM AND PERSISTING THROUGH 5 PM. HREF RAW
ENSEMBLES SHOW SUSTAINED WINDS OF 20-25 MPH WITH GUSTS OF 30-35 MPH
WITH SOME ISOLATED 40 MPH GUSTS WITH 80-90% AGREEMENT.
SATURDAY MODELS SHOW THE UPPER LEVEL TROUGH BEGINNING TO DIG INTO
THE PACNW. AS THE LEADING EDGE OF THE TROUGH WEDGES ITSELF AGAINST
THE CASCADES, THE PRESSURE GRADIENTS BEGIN TO TIGHTEN LEADING TO
BREEZY CONDITIONS THROUGH THE TYPICAL WINDS PRONE GAP AREAS. LOOKING
AT THE NBM RAW ENSEMBLES, 60-80% ARE IN AGREEMENT THAT THE KITTITAS
VALLEY WILL SEE WINDS BETWEEN 20-25 MPH SUSTAINED WINDS WITH GUSTS
OF 30-35 MPH. THE GORGE WILL SEE 15-20 MPH SUSTAINED WINDS AND GUSTS
OF 25-30 MPH.
AVIATION /12Z TAFS THROUGH 12Z FRIDAY/
VFR CONDITIONS WILL PERSIST THROUGH THE FORECAST PERIOD. WINDS WILL
BE GENERALLY LIGHT THROUGH THE PERIOD WITH ONLY DLS SEEING WINDS
NEAR 9 KTS AFTER 21Z. CLEAR SKIES WILL ALSO PERSIST THROUGH THE
PERIOD.
PRELIMINARY POINT TEMPS/POPS
PDT 69 38 74 43 / 0 0 0 0
ALW 69 44 75 50 / 0 0 0 0
PSC 72 36 70 38 / 0 0 0 0
YKM 70 42 69 43 / 0 0 0 0
HRI 70 38 71 40 / 0 0 0 0
ELN 67 37 67 39 / 0 0 0 0
RDM 75 33 79 35 / 0 0 0 0
LGD 70 40 70 46 / 0 0 0 0
GCD 75 36 76 38 / 0 0 0 0
DLS 74 44 75 46 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...90
AVIATION...90
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page