564
FXUS66 KPDT 201040
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
340 AM PDT WED MAY 20 2026
DISCUSSION
A WARMING PATTERN WILL CONTINUE INTO THE END OF THE WORKWEEK AS
AN OFFSHORE RIDGE AXIS AMPLIFIES AND BUILDS INLAND, BRINGING
SUBSIDENCE AND BENIGN SENSIBLE WEATHER. FORECAST HIGH
TEMPERATURES CONTINUE TO TREND HIGHER THROUGH THE 70S AND 80S
BY THE END OF THE WEEK WITH LIMITED HEATRISK OF LEVEL 1 WHICH
AFFECTS THE MOST VULNERABLE TO HEAT WHO ALSO HAVE NO COOLING OR
HYDRATION. A BACKDOOR SURFACE COLD FRONT WILL BE DRIVEN
SOUTHWEST ACROSS THE REGION WEDNESDAY NIGHT THROUGH THURSDAY
MORNING, DRIVEN BY AN ASSOCIATED MID LEVEL SHORTWAVE JUST EAST
OF THE REGION, FLIPPING WINDS OUT OF THE NORTHEAST BUT HAVING
LITTLE IMPACT ON THE WARMING TREND INTO THURSDAY AFTERNOON OTHER
THAN MUTING HOW WARM THE AFTERNOON TEMPS JUMP FROM THE PREVIOUS
DAY.
THE DAY 7, THE ENSEMBLES HINT SYNOPTIC PATTERN DEVELOPING AN
UPPER TROUGH OVER THE PAC NW, LEADING TO COOLER AND WETTER
CONDITIONS MAY 26-27. CLUSTERS 1-3 ARE IN REASONABLE PATTERN
AGREEMENT, WITH CLUSTER 4 SHOWING AN ALTERNATIVE SCENARIO AND A
5% OUTLIER PLACING A WARM DRY RIDGE OVER THE REGION. THE LEADUP
TO THIS MAY BRING ENHANCED WINDS IN THE GAPS AREAS OVER THE
WEEKEND AS THE WESTERLY WINDS RETURN WITH STRONGEST WINDS WITH
POTENTIAL FOR WIND ADVISORIES OVER THE USUAL WINDY SPOTS LIKE
KITTITAS VALLEY, EASTERN COLUMBIA RIVER GORGE AND THE THE BLUE
MOUNTAIN FOOTHILLS.
AVIATION /12Z TAFS THROUGH 12Z THURSDAY/
VFR CONDITION ARE EXPECTED (95% CONFIDENCE) FOR THE ENTIRE TAF
PERIOD AS THE ONLY CLOUDS REMAINS CIRRUS CLOUDS ABOVE 20KFT AND
LIGHT WINDS UNDER 10 KTS EVERYWHERE WITH THE EXCEPTION OF DLS
WHERE SLIGHTLY MORE BREEZY WINDS COME THOUGH THE GORGE (10-20
MPH), AND YKM AND RDM BETWEEN ABOUT 5 PM AND 11 PM.
PRELIMINARY POINT TEMPS/POPS
PDT 73 46 76 47 / 0 0 0 0
ALW 73 49 76 50 / 0 0 0 0
PSC 78 51 81 50 / 0 0 0 0
YKM 79 50 80 52 / 0 0 0 0
HRI 76 49 79 49 / 0 0 0 0
ELN 73 45 75 47 / 0 0 0 0
RDM 73 39 77 41 / 0 0 0 0
LGD 70 41 73 42 / 0 0 0 0
GCD 73 39 75 40 / 0 0 0 0
DLS 77 51 83 54 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...71
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