964
FXUS66 KPDT 252115
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
215 PM PDT MON MAY 25 2026
KEY MESSAGES
- BREEZY TO WINDY CONDITIONS THROUGH THIS EVENING.
- INCREASING PRECIPITATION CHANCES LATER THIS AFTERNOON/EVENING
AS A COLD FRONT MOVES ACROSS THE REGION.
- SHOWER AND THUNDERSTORM CHANCES CONTINUE FOR THE NEXT FEW DAYS
WITH DRIER CONDITIONS FOR THE END OF THE WEEK.
DISCUSSION
AN UPPER LOW AND COLD FRONT WILL MOVE ACROSS THE PACIFIC
NORTHWEST TODAY. THE UPPER LOW WILL THEN GRADUALLY MOVE SOUTH
INTO CALIFORNIA OVER THE NEXT FEW DAYS. HOWEVER, THE LARGER
CYCLONIC CIRCULATION ASSOCIATED WITH THE BROADER TROUGH WILL
REMAIN OVER THE PACIFIC NORTHWEST THROUGH THURSDAY. THE LOW IS
THEN FORECAST TO MOVE NORTHWARD AND WEAKEN, AND BE ABSORBED INTO
A DRIER SOUTHWESTERLY FLOW BETWEEN A RIDGE OVER THE MIDSECTION
OF THE COUNTRY AND A LOW WELL OF THE COAST BY LATER FRIDAY INTO
THE WEEKEND.
AS THE LOW AND COLD FRONT MOVE ACROSS THE REGION TODAY, GUSTY
WINDS ARE EXPECTED. A WIND ADVISORY HAS BEEN ISSUED FOR PORTIONS
OF THE AREA. EVEN IN LOCATIONS NOT UNDER THE WIND ADVISORY,
BREEZY CONDITIONS ARE ANTICIPATED. THE COMBINATION OF BREEZY TO
WINDY CONDITIONS AND LOW RELATIVE HUMIDITIES WILL BRING ENHANCED
FIRE WEATHER CONCERNS, EVERYWHERE, BUT ESPECIALLY ACROSS CENTRAL
OREGON AND THE JOHN DAY HIGHLANDS, WHERE RH VALUES ARE LOWEST.
SHOER CHANCES WILL INCREASE FROM WEST TO EAST LATE THIS
AFTERNOON INTO THIS EVENING AND OVERNIGHT AS THE FRONT MOVES
THROUGH. THE BEST (ALBEIT LOW) CHANCE FOR THUNDERSTORMS IS IN
FAR EASTERN OREGON.
ON TUESDAY, THE LOW WILL BE OVER THE REGION, BEGINNING TO MOVE
SOUTH. AS WITH ANY UPPER LOW, THERE IS INSTABILITY FOR
THUNDERSTORMS AND THE BEST CHANCES (<15%) LOOK TO BE OVER
CENTRAL OREGON.
AFTER TUESDAY NIGHT, LOW RAIN CHANCES WILL CONTINUE MAINLY OVER
THE MOUNTAINS WEDNESDAY, THEN INCREASE AGAIN THURSDAY INTO
FRIDAYAS THE LOW TREKS NORTH. ONCE AGAIN, DUE TO THE PROXIMITY
OF THE UPPER LOW THERE WILL BE AT LEAST SOME THUNDERSTORM
POTENTIAL. WILL HAVE TO SEE HOW THIS DEVELOPS THROUGH THE WEEK.
BEYOND LATE FRIDAY A DRIER PATTERN THEN MOVES IN FOR THE
WEEKEND.
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
VFR CONDITIONS CURRENTLY ACROSS ALL SITES, WHICH WILL STAY THE
COURSE THROUGH THE PERIOD. WIDESPREAD WIND GUSTS OF 20-30KTS ARE
EXPECTED, AS LIGHT RAIN ALSO PASSES THROUGH THE AREA THIS
AFTERNOON AND EVENING ASSOCIATED WITH A COLD FRONT. WINDS WILL
STAY ELEVATED THROUGH THE DAY BEFORE SLOWLY SUBSIDING THIS
EVENING INTO THE OVERNIGHT PERIOD. CLOUDS WILL INCREASE AND
CEILINGS WILL DROP TO 5KFT AS THE SYSTEM PASSES THIS AFTERNOON,
WHICH CONTINUES THROUGH THE REMAINDER OF THE PERIOD. 75
PRELIMINARY POINT TEMPS/POPS
PDT 43 61 45 73 / 90 50 60 10
ALW 47 61 48 75 / 70 60 60 0
PSC 44 68 46 81 / 70 20 40 0
YKM 45 69 48 85 / 30 0 10 0
HRI 44 65 46 78 / 80 20 40 10
ELN 41 63 45 80 / 40 10 10 0
RDM 33 59 35 71 / 30 20 40 20
LGD 41 54 43 73 / 70 90 80 20
GCD 38 55 39 72 / 90 70 90 40
DLS 45 69 50 81 / 20 10 10 10
PDT WATCHES/WARNINGS/ADVISORIES
WA...WIND ADVISORY UNTIL 11 PM PDT THIS EVENING FOR WAZ027-521.
OR...WIND ADVISORY UNTIL 11 PM PDT THIS EVENING FOR ORZ510-511.
DISCUSSION...77
AVIATION...75
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