110
FXUS66 KPDT 101747
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1047 AM PDT MON AUG 10 2026
.UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- DRY AND WARM WITH DIURNAL BREEZES THROUGH WEDNESDAY.
- AN UPPER LEVEL TROUGH WILL THEN MOVE IN FOLLOWED BY A RETURN
TO SOUTHWESTERLY FLOW. THEN THERE WILL BE OPPORTUNITIES FOR
MOUNTAIN SHOWERS AND THUNDERSTORMS FOR THE END OF THE WEEK.
DISCUSSION
DRY WESTERLY FLOW WILL CONTINUE OVER THE PACIFIC NORTHWEST FOR
THE NEXT SEVERAL DAYS. BREEZY DIURNAL WINDS ARE ANTICIPATED,
WITH THE SIMCOE HIGHLANDS, COLUMBIA BASIN, GORGE AND KITTITAS
VALLEY HAVING AFTERNOON WIND GUSTS IN THE 20 TO 30 MPH RANGE,
POSSIBLY AS HIGH AS 35 MPH TODAY AND TUESDAY, THEN DECREASING A
BIT ON WEDNESDAY.
NBM PROBABILITIES OF WIND GUSTS >=25 MPH ARE >80 PERCENT IN
THESE AREAS TODAY, AND SIMILAR ON TUESDAY, THOUGH WITH SLIGHTLY
LESS AREAL COVERAGE. NBM PROBABILITIES OF WIND GUSTS >=39 MPH
ARE 70-90 PERCENT IN THE KITTITAS VALLEY AND GENERALLY LESS THAN
50 PERCENT EVERYWHERE ELSE.
HIGH TEMPERATURES TODAY WILL BE SIMILAR TO YESTERDAY, PERHAPS A
DEGREE OR TWO COOLER IN SOME LOCATIONS. TUESDAY WILL BE ABOUT
THE SAME AS TODAY AND WEDNESDAY WILL BE A COUPLE OF DEGREES
COOLER. WITH THE SLIGHTLY LOWER TEMPERATURES BY MIDWEEK, RH
VALUES WILL INCREASE A COUPLE OF PERCENTAGE POINTS TODAY AND A
FEW MORE GOING INTO WEDNESDAY. THIS WILL HELP WITH FIRE WEATHER
CONDITIONS, THOUGH THEY WILL STILL REMAIN ELEVATED.
BY MIDWEEK, LOW PRESSURE IN BRITISH COLUMBIA WILL MOVE SOUTH AND
PUSH A TROUGH INTO THE PACIFIC NORTHWEST. THIS LOW COULD
POTENTIALLY TRIGGER SOME LIGHT SHOWERS OVER THE WASHINGTON
CASCADES WEDNESDAY, BUT NOT MUCH MORE THAN THAT.
BY THURSDAY, SOUTHWEST FLOW WILL DEVELOP BEHIND THE DEPARTING
LOW AND WILL STRENGTHEN INTO THE WEEKEND. THERE WILL ALSO BE
INCREASING MONSOONAL MOISTURE SPECIALLY FRIDAY ONWARD.
WHILE IT IS TOO EARLY TO TELL EXACTLY HOW THINGS WILL DEVELOP
THIS FAR OUT, THERE IS DEFINITELY SOME POTENTIAL (15-30%) FOR
MAINLY MOUNTAIN SHOWERS AND THUNDERSTORMS OVER CENTRAL AND
EASTERN OREGON.
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
VFR CONDITIONS CURRENTLY ACROSS ALL SITES, WHICH WILL STAY THE
COURSE FOR MOST TERMINALS THROUGH THE PERIOD. KRDM/KBDN WILL BE
THE EXCEPTION AS SMOKE FROM NEARBY WILDFIRES IS EXPECTED TO DROP
VISIBILITIES THE 5SM. BREEZY WINDS ARE ALSO ANTICIPATED FOR
KDLS/KPDT WITH GUSTS OF 20-30KTS THROUGH THE AFTERNOON. 75
PRELIMINARY POINT TEMPS/POPS
PDT 88 53 88 54 / 0 0 0 0
ALW 89 60 89 60 / 0 0 0 0
PSC 92 56 91 57 / 0 0 0 0
YKM 92 58 92 59 / 0 0 0 0
HRI 91 57 90 58 / 0 0 0 0
ELN 85 55 85 55 / 0 0 0 0
RDM 89 46 88 45 / 0 0 0 0
LGD 90 52 90 53 / 0 0 0 0
GCD 91 52 92 52 / 0 0 0 0
DLS 89 60 88 61 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...AIR QUALITY ALERT UNTIL 11 AM PDT THURSDAY FOR WAZ024-026>030-
521>523.
OR...AIR QUALITY ALERT UNTIL NOON PDT WEDNESDAY FOR ORZ041-049-050-
502-503-505-506-508>511.
DISCUSSION...77
AVIATION...75
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