683
FXUS66 KPDT 181728
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1028 AM PDT MON MAY 18 2026
KEY MESSAGES
- BREEZY GAP WINDS TODAY AND TUESDAY
- PLEASANT WEATHER FOR MOST OF THE WEEK WITH A WARMING TREND
- MOUNTAIN SHOWERS IN THE WALLOWAS THIS AFTERNOON
DISCUSSION
GOES SATELLITE SHOWED CIRRUS OVERSPREADING EAST OF THE CASCADES
BUT MAINLY CLEAR CONDITIONS ACROSS THE MUCH OF EASTERN OREGON
WITH THE CAVEAT OF LINGERING MID LEVEL CLOUDS FROM EARLIER RAIN
SHOWERS OVER THE WALLOWAS AND NORTHERN BLUE MOUNTAINS OF
WASHINGTON. ROUGHLY 20 TO 50 % CHANCES REMAIN FOR SHOWER ACROSS
THE WALLOWAS THIS AFTERNOON, WHERE SNOW COULD MIX IN BUT IS
UNLIKELY TO ACCUMULATE EVEN ABOVE 6500 FT AGL. MODELS GOING
FORWARD SHOW A GRADUALLY BUILDING RIDGE ACROSS THE PAC NW AS 500
MB HEIGHTS RISE FROM ABOUT 564DM TO 570 BY TUESDAY. THIS SUNNY
HIGH PRESSURE SETUP WILL BRING SOME MODIFICATION TO SURFACE
TEMPERATURES ESPECIALLY IN THE SECOND HALF OF THE WEEK WHERE
HIGHS IN THE 80S SHOULD BE RETURNABLE BY THURSDAY AND FRIDAY.
WESTERLY GAP AND VALLEY WINDS WILL ALSO BE A DIURNALLY DRIVEN
SENSIBLE WEATHER BEGINNING WITH THE KITTITAS VALLEY AND THE
EASTERN COLUMBIA GORGE, AND ADJACENT BLUE MOUNTAIN FOOTHILLS.
HERE, AREAS AROUND ELLENSBURG HAS ABOUT 75% CHANCES FOR WIND
GUSTS ABOVE 30 MPH BUT LITTLE IF ANY APPRECIABLE CHANCES FOR
GUSTS ABOVE 40 MPH. STRONGEST WINDS IN THE REGION LOOK TO BE
ALONG RIDGE TOPS. AS THE TRANSITION FORM THE COOLER AIRMASS TO
THE A WARMER ON ON WEDNESDAYS WITH THE UPPER RIDGE BECOMING MORE
CENTERED ACROSS WASHINGTON AND OREGON, THE WINDS WILL BECOME
LIGHTER OVER A BROADER AREA.
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
VFR CONDITIONS ARE FORECAST FOR THE NEXT 24 HOURS AT ALL SITES.
WINDS WILL BE DIURNALLY AND TERRAIN-DRIVEN, BREEZY FROM LATE
MORNING THROUGH EVENING. THERE IS A VERY LOW (10 PERCENT) CHANCE
OF RAIN SHOWERS THIS AFTERNOON AT YKM WITH EVEN LOWER CHANCES
(5 PERCENT OR LESS) ELSEWHERE.
PRELIMINARY POINT TEMPS/POPS
PDT 69 42 72 46 / 0 0 0 0
ALW 69 46 72 49 / 0 0 0 0
PSC 75 44 77 48 / 0 0 0 0
YKM 74 44 76 47 / 0 0 0 0
HRI 73 44 75 48 / 0 0 0 0
ELN 68 41 68 43 / 0 0 0 0
RDM 68 30 72 37 / 0 0 0 0
LGD 64 36 68 40 / 0 0 0 0
GCD 65 34 71 38 / 0 0 0 0
DLS 73 45 74 49 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...86
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