738
FXUS66 KPDT 022133
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
233 PM PDT TUE JUN 2 2026
KEY MESSAGES
- CHANCES OF ISOLATED THUNDERSTORMS INCREASE IN THE
EASTERN/WALLOWA MOUNTAINS TOMORROW.
- BREEZY TO WINDY CONDITIONS DEVELOP FROM NORTH CENTRAL OREGON
THROUGH THE KITTITAS VALLEY ON FRIDAY.
- MOSTLY DRY SET-UP THURSDAYS ONWARDS.
DISCUSSION
RADAR AND SATELLITE SHOWS A FAIRLY CLEAR AND DRY DAY ACROSS THE
REGION, WITH TEMPERATURES REACHING THE HIGH 70S TO LOW 80S. DRY
CONDITIONS WILL CONTINUE THROUGH EARLY WEDNESDAY MORNING WITH A
WEAK OVERHEAD RIDGE SITUATED ALOFT. A SHORTWAVE WILL MOVE
ONSHORE WEDNESDAY MORNING, INCREASING THUNDERSTORM CHANCES WITH
MOIST MARITIME AIR ENTERING THE AREA. GFS AND ECMWF
DETERMINISTIC GUIDANCE BRINGS DEW POINTS IN THE UPPER 40S TO
LOWER 50S ACROSS PORTIONS OF THE WALLOWA MOUNTAINS DOWN TO PARTS
OF THE OREGON BLUE MOUNTAINS LATE WEDNESDAY MORNING THROUGH THE
LATE AFTERNOON HOURS. THIS IS THE HIGHEST CHANCE (10 TO 20
PERCENT CHANCE) OF ISOLATED THUNDERSTORM DEVELOPMENT IN THAT
REGION. NBM PIN POINTS HIGHEST VALUES OF CAPE AT THE SURFACE
(150 TO 350 J/KG) IN THE SAME REGION BY LATE MORNING/EARLY
AFTERNOON WEDNESDAY, ALONG ACROSS THE KITTITAS VALLEY. ALTHOUGH
SUFFICIENT LIFT IS PRESENT IN THE KITTITAS VALLEY, WIND SHEAR IS
NOT AS STRONG IN THE WALLOWAS (5 TO 15 KNOTS COMPARED TO 20 TO
30 KNOTS) THEREFORE ANY RAIN SHOWERS ARE UNLIKELY TO DEVELOP
INTO AN ISOLATED STORM THOUGH A 5 TO 10 PERCENT CHANCE STILL
REMAINS FOR THE KITTITAS.
OVERHEAD SYNOPTIC PATTERN BECOMES MORE ZONAL/RIDGE-LIKE
THURSDAY AND FRIDAY, LEAVING A MOSTLY DRY WEATHER PATTERN TO
PERSIST THROUGH THE WEEKEND. ANOTHER TROUGH IS EXPECTED TO
EMERGE FROM THE GULF OF ALASKA INTO THE PACNW BY FRIDAY MORNING
(>90 PERCENT CHANCE), ALTHOUGH THIS NEXT SYSTEM WILL BE MOSTLY
RAIN SHADOWED BY THE CASCADE MOUNTAINS, SECLUDING RAIN SHOWERS
AND LIGHT MOUNTAIN SNOW TO THAT REGION. THE INCOMING TROUGH WILL
IMPACT THE LOWER ELEVATION ZONES FRIDAY VIA TIGHT PRESSURE
GRADIENT FORMATION AND A 850 MB 30-50 KNOT JET, LEADING TO
BREEZY TO WINDY CONDITIONS FRIDAY. AREA OF BIGGEST CONCERN FOR
WINDS WILL BE FROM NORTH CENTRAL OREGON THROUGH THE KITTITAS
VALLEY. NBM GUIDANCE ADVERTISES THE CHANCE OF 45 MPH OR GREATER
WIND GUSTS THROUGH FRIDAY AS 10-30% CHANCE IN PARTS OF NORTH
CENTRAL OREGON AND THE KITTITAS VALLEY, WITH HIGHER CHANCES OF
40-70% CHANCES ACROSS THE SIMCOE HIGHLANDS. AS OF NOW, NO WIND
HIGHLIGHTS ARE EXPECTED BUT WILL BE MONITORED AS THE EVENT GETS
CLOSER OVER THE NEXT FEW DAYS.
AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/
VFR CONDITIONS ARE FORECAST AT ALL SITES FOR THE NEXT 24 HOURS.
MOSTLY CLEAR SKIES TODAY WILL TRANSITION TO MOSTLY CLOUDY TO
OVERCAST SKIES CONSISTING OF MID/HIGH CLOUD BY WEDNESDAY
MORNING. SUSTAINED WINDS OF 12 KTS OR LESS ARE FORECAST TODAY, ALBEIT
WITH HIGHER GUSTS. WESTERLY WINDS WILL BECOME BREEZY LATER WEDNESDAY
MORNING AND AFTERNOON. A LOW (10-30 PERCENT) CHANCE OF LIGHT RAIN SHOWERS
IS FORECAST FOR ALL SITES BETWEEN WEDNESDAY MORNING AND AFTERNOON.
PRELIMINARY POINT TEMPS/POPS
PDT 51 78 48 76 / 0 20 10 0
ALW 55 80 54 76 / 0 20 10 0
PSC 54 83 52 81 / 0 20 10 0
YKM 56 80 48 80 / 0 30 0 0
HRI 53 81 51 79 / 0 20 0 0
ELN 53 74 46 72 / 0 50 10 0
RDM 50 74 38 75 / 0 10 0 0
LGD 47 76 45 74 / 0 30 20 0
GCD 47 77 42 76 / 0 40 10 0
DLS 63 78 54 77 / 0 10 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...95
AVIATION...86
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