400
FXUS66 KPDT 100304
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
804 PM PDT TUE JUN 9 2026
KEY MESSAGES
- SCATTERED MOUNTAIN SHOWERS THROUGH WEDNESDAY MORNING
- BREEZY TO WINDY CONDITIONS THROUGH THIS EVENING, WITH BREEZY
CONDITIONS WEDNESDAY
- WARMER, DRIER CONDITIONS THURSDAY THROUGH THE WEEKEND
UPDATE
THE NUMBER OF OBSERVATIONS SHOWING STRONG GUSTS TO 40 MPH OR
MORE HAS SIGNIFICANTLY DIMINISHED AND ARE MOSTLY RELEGATED TO
A FEW HIGHER EXPOSED RIDGES. WIND ADVISORIES HAVE BEEN
CANCELLED. LAMP GUIDANCE SHOWS CONTINUED BREEZY WINDS OVERNIGHT
BLENDING SEAMLESSLY INTO THE ANTICIPATED BREEZY CONDITIONS FOR
TUESDAY. 71/RUSSELL
DISCUSSION
TODAY THROUGH WEDNESDAY: SHOWERS HAVE RETREATED TO
THE MOUNTAINS THIS AFTERNOON AS AN UPPER TROUGH SWINGS INTO
NORTHERN ID AND MT. PARTLY CLOUDY TO CLOUDY CONDITIONS ARE
EVIDENT ACROSS MUCH OF THE FORECAST AREA, THOUGH SOME "CLEAR"
POCKETS HAVE DEVELOP ACROSS PORTIONS OF CENTRAL OR AND THE HORSE
HEAVEN HILLS. BREEZY WINDS ALSO CONTINUE ACROSS MUCH OF THE AREA
POST A COLD FRONT PASSAGE THIS MORNING, WITH SOME "EXPOSED"
STATIONS HAVING RECORDED GUSTS 45MPH OR OVER SO FAR.
TODAY, SHOWER ACTIVITY WILL CONTINUE ACROSS MOUNTAIN AREAS AS
NORTHWEST FLOW ALOFT DEVELOPS BEHIND THE TROUGH AXIS EXIT. WEAK
INSTABILITY WILL DEVELOP ACROSS FAR NORTHEAST OR AND SOUTHEAST
WA LATE THIS AFTERNOON, RESULTING IN A SLIGHT CHANCE (10-20%)
OF ISOLATED THUNDERSTORMS. HOWEVER, THUNDERSTORM ACTIVITY IS
EXPECTED TO DIMINISH EARLY THIS EVENING AS THE TROUGH LIFTS
FURTHER INTO MT. OTHERWISE, WIDESPREAD BREEZY SOUTHWEST TO WEST
WINDS (15-25 MPH WITH GUSTS UP TO 40 MPH) WILL CONTINUE INTO
THIS EVENING BEHIND A COLD FRONT PASSAGE FROM EARLIER THIS
MORNING. IN THE LOWER ELEVATIONS, STRONGER PERIODIC GUSTS TO
AROUND 45 MPH AND SUSTAINED WINDS UP TO 30 MPH WILL CONTINUE TO
IMPACT AREAS OF THE COLUMBIA BASIN, BLUE MOUNTAIN FOOTHILLS, AND
IN PORTIONS OF THE KITTITAS VALLEY.
BY WEDNESDAY, THE TROUGH WILL SLIDE FURTHER EAST OF THE REGION
WHILE UPPER LEVEL RIDGING WILL DEVELOP OVER THE NORTHEAST
PACIFIC. ANY LINGERING SHOWER ACTIVITY OVER THE MOUNTAINS WILL
DIMINISH BY THE LATE MORNING AS A SHORTWAVE ROUNDING THE TROUGH
EXITS TO THE EAST AND THE REGION COMES UNDER THE INFLUENCE OF
THE UPPER RIDGE OFFSHORE. BREEZY TO LOCALLY BREEZY WINDS WILL
CONTINUE INTO WEDNESDAY EVENING, BUT WILL BECOME LIGHT WEDNESDAY
NIGHT INTO THURSDAY.
THURSDAY THROUGH MONDAY: THERE IS GOOD AGREEMENT AMONGST
ENSEMBLE GUIDANCE THAT THE PACNW WILL BE UNDER THE INFLUENCE OF
AN UPPER LEVEL RIDGE IN THE NORTHEAST PACIFIC THROUGH EARLY
NEXT WEEK. CONDITIONS ACROSS THE AREA WILL TREND DRIER AND
WARMER, WITH THE PEAK OF THE HEATING CORRESPONDING WITH THE
UPPER LEVEL RIDGE AXIS DRIFTING CLOSER TO THE PACNW (CONFIDENCE
60-70%). PER THE NBM, CHANCES OF REACHING 90 DEGREES HAVE
DROPPED TO 15-30% FOR SATURDAY ACROSS PORTIONS OF THE COLUMBIA
BASIN, WITH SUNDAY SHOWING 35-60% CHANCE, AND MONDAY A 45-85%
CHANCE ACROSS MOST OF OUR LOWER ELEVATION LOCATIONS. WHILE
WINDS WOULD GENERALLY TREND LIGHT THROUGH THIS PERIOD, ENSEMBLE
GUIDANCE IS IN GOOD AGREEMENT IN LOCALLY BREEZY CONDITIONS
DEVELOPING SATURDAY AND SUNDAY AS A SHORTWAVE TROUGH DIVES DOWN
THE NORTHERN ROCKIES (CONFIDENCE 65-70%). THIS WOULD BRING
ELEVATED FIRE WEATHER CONDITIONS ACROSS THE COLUMBIA BASIN INTO
PORTIONS OF CENTRAL OR AND THE OR CASCADE EAST SLOPES OVER THE
WEEKEND, WITH THE NBM SHOWING A 30-50% CHANCE OF CRITICAL
WIND/RH CRITERIA (RH < 25% AND WINDS > 15 MPH) BEING MET.
LAWHORN/82
AVIATION /00Z TAFS THROUGH 00Z THURSDAY/
VFR CONDITIONS TO
PREVAIL THROUGH THE PERIOD. BREEZY WINDS (15-25KTS WITH GUSTS UP
TO 40KTS) WILL IMPACT SITES INTO THIS EVENING, WITH WINDS
WEAKENING LATE THIS EVENING AND OVERNIGHT. HOWEVER, WINDS
12-17KTS WILL PERSIST AT SITES DLS/PDT/ALW/PSC OVERNIGHT. EXPECT
WINDS TO INCREASE AGAIN AND GUSTS TO RETURN BETWEEN 14Z-18Z AT
ALL SITES TOMORROW. LAWHORN/82
PRELIMINARY POINT TEMPS/POPS
PDT 43 68 41 78 / 10 10 0 0
ALW 47 69 46 78 / 20 20 0 0
PSC 45 75 43 82 / 0 0 0 0
YKM 43 74 44 81 / 0 0 0 0
HRI 44 72 43 81 / 0 0 0 0
ELN 39 64 40 76 / 10 0 0 0
RDM 34 67 34 81 / 0 0 0 0
LGD 41 63 37 77 / 30 50 0 0
GCD 37 65 35 81 / 0 0 0 0
DLS 49 70 46 81 / 10 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
UPDATE...71
DISCUSSION...82
AVIATION...82
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