704
FXUS66 KPDT 041712
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1012 AM PDT THU JUN 4 2026
KEY MESSAGES
- BREEZY WINDS DEVELOPING IN THE SIMCOE HIGHLANDS, COLUMBIA RIVER
GORGE AND KITTITAS VALLEY TODAY, WITH WINDS PEAKING FRIDAY.
- COOLING TREND THROUGH SATURDAY WITH WEEKEND CASCADES RAIN.
- MORE WIDESPREAD RAIN SHOWERS MONDAY INT TUESDAY.
DISCUSSION
THE SYNOPTIC SETUP FEATURES AND EASTWARD MOVING/EXITING
SHORTWAVE IN ADVANCE OF EASTERN PACIFIC UPPER LOW THAT WILL DIVE
SOUTHEAST TOWARD THE BC/WA COAST THROUGH FRIDAY NIGHT. IN THE
MEANTIME FOR THURSDAY, A BROAD UPPER WEAKLY DIFFLUENT FLOW WILL
BE IN PLACE WITH DRY WEATHER ACROSS THE COLUMBIA BASIN AND
MOUNTAIN ZONES.
BREEZY WINDS THROUGH THE MOUNTAIN GAPS CAN BE EXPECTED TO
INCREASE OVER THE NEXT COUPLE OF DAYS AS THE AFOREMENTIONED
UPPER LOW SPREADS TO THE PAC NW COAST BY FRIDAY EVENING,
BRINGING A MARINE PUSH AND FRONTAL PASSAGE INTO THE INTERIOR FOR
SATURDAY. THE BREEZY WINDS TODAY WILL BE LARGELY RELEGATED TOT
HE KITTITAS VALLEY AND THE EASTERN COLUMBIA RIVER GORGE/LOWER
COLUMBIA BASIN. THOSE CONDITIONS BECOME MORE WINDY BY FRIDAY
AFTERNOON WITH SUSTAINED SPEEDS THOUGH THE GORGE ON THE ORDER OF
20- TO 25 MPH AND HIGHER GUSTS IN THE 30 TO 40 MPH RANGE ACROSS
THE SIMCOE HIGHLANDS AND COLUMBIA BASIN OF OREGON.
A SECONDARY UPPER COLD CORE LOW IS SHOWN BY THE EC/CANADIAN AND
GFS MODELS TO IMPACT THE REGION MONDAY NIGHT INTO WEDNESDAY
BRINGING OPPORTUNITY FOR CLOUDY, COOLER AS WELL AS MORE WET
WEATHER EVEN FOR THE BASIN AREA AND EASTERN MOUNTAINS.
RUSSELL/71
AVIATION /18Z TAFS THROUGH 18Z FRIDAY/
VFR CONDITIONS TO
PREVAIL THROUGH THE PERIOD. WINDS AT SITE DLS WILL INCREASE TO
12-20KTS WITH GUSTS TO AROUND 30KTS TODAY, THEN BECOME 12KTS OR
LESS AFTER 07Z. SITE PDT WILL SEE WINDS AROUND 12KTS AND GUSTS
AROUND 20KTS THROUGH THIS EVENING WITH BREEZY WINDS REDEVELOPING
AFTER 16Z TOMORROW. SITE YKM WILL SEE GUSTS UP TO 20KTS LATE
THIS AFTERNOON AND EARLY EVENING, WITH OTHERWISE LIGHT WINDS
THROUGH THE PERIOD. ALL OTHER SITES WILL SEE LIGHT WINDS THROUGH
THE PERIOD. LAWHORN/82
FIRE WEATHER
THURSDAY AND FRIDAY POSE ELEVATED FIRE WEATHER
RISK IN THE COLUMBIA BASIN AS WINDS PICK UP LEADING TO COMBINED
PROBABILITIES FOR LOW RH AND STRONG WINDS. COMBINES PROBS OF OF
25% AND 15 MPH ARE BETWEEN 30 AND 70% ACROSS THE OREGON BASIN
ZONES TODAY AND THE WASHINGTON COLUMBIA BASIN AREA ON FRIDAY.
CHANCES FOR WETTING RAINS INCREASE TO A 20-80% RANGE BY SATURDAY
NIGHT ACROSS THE CASCADES EASTERN SLOPES TO THE CREST. AS THE
UPPER LOW MAKES IT WAY ACROSS THE REGION OVER THE WEEKEND, A DRY
PERIOD ON SUNDAY IS ANTICIPATED. ANOTHER UPPER LOW IN THE
MODELS DIGS FARTHER SOUTH ACROSS THE INTERIOR MONDAY NIGHT
SPREADING HIGH WETTING RAIN CHANCES ACROSS THE CASCADES CREST
(80%) AND EASTERN SLOPES (30-65%). THE EASTERN MOUNTAINS WILL
HAVE SIMILAR CHANCES FOR WETTING RAINS BUT WITH A SLIGHT TIME
LAG INTO THE TUESDAY NIGHT TIME WINDOW ON A 24 HOUR BASIS.
RUSSELL/71
PRELIMINARY POINT TEMPS/POPS
PDT 75 47 72 44 / 0 0 0 0
ALW 76 52 73 49 / 0 0 0 0
PSC 80 49 77 46 / 0 0 0 0
YKM 80 47 74 43 / 0 0 0 0
HRI 78 50 73 45 / 0 0 0 0
ELN 71 43 65 38 / 0 0 0 0
RDM 76 39 72 37 / 0 0 0 0
LGD 74 43 74 42 / 0 0 0 0
GCD 77 41 79 40 / 0 0 0 0
DLS 77 51 71 48 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...82
FIRE WEATHER...71
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