600
FXUS66 KPDT 041036
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
336 AM PDT SUN OCT 4 2026
KEY MESSAGES
- UPPER LEVEL HIGH PRESSURE BUILDING OVER THE REGION THROUGH
NEXT WEEK, WITH DRY CONDITIONS PREVAILING AND ABOVE NORMAL
TEMPERATURES
- MOSTLY LIGHT WINDS EACH DAY, BUT BREEZY CASCADE GAPS WINDS
WILL DEVELOP MONDAY AFTERNOON
- INCREASING CONFIDENCE IN UNSETTLED WEATHER CONDITIONS
RETURNING AT THE END OF THE WEEK
DISCUSSION
A RELATIVELY LOW IMPACT/RISK WEATHER PATTERN LOOKS TO BE IN
STORE FOR THE UPCOMING WEEK WITH NO OTHER NOTABLE ELEMENTS OTHER
THAN MINOR BREEZY GAP WINDS ON MONDAY AND SOME AREAS OF LOW
RELATIVE HUMIDITY. WINDS WILL BECOME BREEZY AGAIN ON THE WEEKEND
WHEN A PATTERN CHANGE BECOMES MORE PROBABLE. MONDAY THE WINDS
THOUGH THE GAPS WILL BE ENHANCED AS THE PRESSURE DIFFERENTIAL
CREATES A GRADIENT DRIVING WESTERLY WINDS THOUGH THE KITTITAS
VALLEY AND COLUMBIA RIVER GORGE TO AROUND 20-25 KNOT
GUSTS/APPROACHING 30 MPH NEAR THE DALLES/ELLENSBURG, BASED ON
NBM AVERAGE. CONFIDENCE IN THESE WIND SPEEDS MONDAY ARE AT
AROUND 30%. MONDAY WILL ALSO MARK THE PEAK OF THE WARMING TREND
AND THE DOWNSLOPING SURFACE WIND ACROSS THE COLUMBIA BASIN WITH
FULL INSOLATION PROMOTES WARMING TEMPS INTO THE MID 80S. NBM
SHOWS TEMPERATURES PUSHING NEAR 90S DEGREES OVER PARTS OF
CENTRAL OREGON AND THE JOHN DAY BASIN. A PATTERN CHANGE LOOKS
MORE LIKELY BY AROUND FRIDAY INTO SATURDAY AS THE NBM RAMPS UP
WINDS ACROSS THE GAPS AND BRINGS IN RAIN CHANCES OVER THE
CASCADE CREST AND EASTERN SLOPES. BETTER CONFIDENCE IN WETTING
RAINS ARE RELEGATED TO THE WA CASCADES UPPER SLOPES ZONES, WHERE
ABOUT A 20% CHANCE NEAR CLE ELUM INCREASING TO ABOUT A 60%
CHANCE FOR GREATER THAN TENTH OF AN INCH ACROSS THE CASCADE
CREST BY SATURDAY MORNING. ABOUT A 10 TO 20 PERCENT CHANCE
EXISTS ACROSS THE BLUE MOUNTAINS.
AVIATION /12Z TAFS THROUGH 12Z MONDAY/
ANOTHER ROUND OF VFR CONDITIONS AND LIGHT WINDS UNDER 12 KNOTS
THROUGH THE TAF PERIOD.
PRELIMINARY POINT TEMPS/POPS
PDT 79 50 83 50 / 0 0 0 0
ALW 79 56 83 55 / 0 0 0 0
PSC 81 48 83 48 / 0 0 0 0
YKM 81 51 83 50 / 0 0 0 0
HRI 81 49 84 49 / 0 0 0 0
ELN 77 50 78 47 / 0 0 0 0
RDM 87 46 86 42 / 0 0 0 0
LGD 88 51 86 48 / 0 0 0 0
GCD 91 53 87 48 / 0 0 0 0
DLS 85 55 86 52 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...71
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