716
FXUS66 KPDT 102143
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
243 PM PDT WED JUN 10 2026
KEY MESSAGES
- DRYING AND WARMING TREND THROUGH EARLY NEXT WEEK
- LOCALLY BREEZY NORTHERLY WINDS DEVELOPING OVER THE WEEKEND
DISCUSSION
TODAY: SATELLITE IMAGERY THIS AFTERNOON SHOWS AN
UPPER SHORTWAVE TROUGH HAS EXIT THE REGION, WITH MAINLY CLOUDY
TO PARTLY CLOUDY CONDITIONS ACROSS THE EASTERN HALF OF THE
FORECAST AREA. BEHIND THE SHORTWAVE EXIT, WINDS HAVE STARTED TO
WEAKEN AND RADAR SHOWS SHOWERS ARE DIMINISHING ACROSS THE
EASTERN MOUNTAINS. THIS WILL BE THE TREND THROUGH THE REMAINDER
OF TODAY, WITH DRY CONDITIONS AND LIGHT WINDS RETURNING LATE
THIS EVENING.
THURSDAY THROUGH SUNDAY: THE REGION WILL SIT BETWEEN AN
AMPLIFYING UPPER LEVEL RIDGE OFFSHORE AND A BROAD TROUGH CENTERED
OVER THE NORTHERN GREAT PLAINS THROUGH THE WEEKEND. CONDITIONS
WILL REMAIN DRY ACROSS THE FORECAST AREA THROUGH THIS PERIOD,
WHILE DIURNALLY DRIVEN WINDS DEVELOP THURSDAY AND FRIDAY. OVER
THE WEEKEND, ENSEMBLE GUIDANCE IS IN GOOD AGREEMENT OF SHORTWAVE
TROUGHING DIVING DOWN THE NORTHERN ROCKIES, WHICH WILL CLIP THE
PACNW. THIS WILL SHIFT SURFACE WINDS TO THE NORTH AND NORTHEAST
SATURDAY AND SUNDAY, WITH LOCALLY BREEZY WINDS (10-20 MPH)
DEVELOPING FROM THE COLUMBIA BASIN INTO CENTRAL OR IN THE
AFTERNOONS. THIS WILL LEAD TO ELEVATED FIRE WEATHER CONDITIONS
ACROSS PORTIONS OF THE OR COLUMBIA BASIN SATURDAY AND SUNDAY
AFTERNOONS, THOUGH CHANCES OF RED FLAG THRESHOLDS BEING MET ARE
ONLY 25-40% SATURDAY AND 35-50% SUNDAY.
SUNDAY, ENSEMBLE CLUSTER GUIDANCE IS IN GOOD AGREEMENT THAT THE
UPPER LEVEL RIDGE OFFSHORE WILL MOVE CLOSER TO THE PACNW, WHICH
WILL INTRODUCE CHANCES (30-50%) OF HITTING 90 DEGREES ACROSS
PORTIONS OF THE COLUMBIA BASIN AND EASTERN GORGE.
MONDAY AND TUESDAY: MOST RECENT ENSEMBLE CLUSTER GUIDANCE IS IN
GOOD AGREEMENT THAT THE UPPER LEVEL RIDGE WILL SLIDE INLAND
MONDAY, LIMITING WIND CONCERNS BUT ALSO INCREASING THE WARMING
TREND ACROSS THE LOWER ELEVATIONS, WITH MOD-HIGH CONFIDENCE
(65-80%) OF WIDESPREAD LOW TO MID 90 DEGREE HIGH TEMPERATURES
DEVELOPING MONDAY AFTERNOON. WITH THE RIDGE AXIS MOVING
OVERHEAD, WINDS WILL BECOME LIGHT, WHICH WILL LIMIT FIRE WEATHER
CONCERNS TO THE VERY DRY CONDITIONS IN THE LOWER ELEVATIONS.
BY TUESDAY, GREAT AGREEMENT REMAINS IN THE UPPER RIDGE BREAKING
DOWN AS IT MOVES FURTHER INLAND, BRINGING THE PEAK OF THE
WARMING TREND IN THE AFTERNOON AS WELL AS INTRODUCING BREEZY TO
LOCALLY WINDY CONDITIONS TO THE INTERMOUNTAIN PACNW (CONFIDENCE
60-70%). LOOKING TO THE NBM, THERE IS A 30-50% CHANCE OF 100
DEGREE TEMPS DEVELOPING TUESDAY AFTERNOON ALONG THE I-82
CORRIDOR FROM HERMISTON TO YAKIMA, AS WELL AS IN THE WALLA
WALLA VALLEY AND EASTERN GORGE. CURRENTLY, PROBABILISTIC
HEATRISK GUIDANCE SHOWS A 10-40% CHANCE OF MAJOR HEATRISK
DEVELOPING ACROSS THE COLUMBIA BASIN AND EASTERN GORGE TUESDAY.
IF THIS TREND CONTINUES, HEAT PRODUCTS MAY NEED TO BE ISSUED FOR
SOME PORTIONS OF THE COLUMBIA BASIN EARLY NEXT WEEK. LAWHORN/82
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/
VFR CONDITIONS TO
PREVAIL THROUGH THE PERIOD. BREEZY WINDS (12-18KTS WITH GUSTS
18-25KTS) WILL CONTINUE AT MOST SITES THROUGH THE REMAINDER OF
THE AFTERNOON, WITH WINDS BECOMING LIGHT THROUGH THE REMAINDER
OF THE PERIOD. LAWHORN/82
PRELIMINARY POINT TEMPS/POPS
PDT 41 78 49 80 / 0 0 0 0
ALW 47 79 53 81 / 0 0 0 0
PSC 44 82 50 85 / 0 0 0 0
YKM 44 82 50 84 / 0 0 0 0
HRI 43 81 51 84 / 0 0 0 0
ELN 40 77 47 77 / 0 0 0 0
RDM 34 80 43 83 / 0 0 0 0
LGD 38 78 44 78 / 0 0 0 0
GCD 36 81 43 82 / 0 0 0 0
DLS 47 81 54 82 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...82
AVIATION...82
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