603
FXUS66 KPDT 091008
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
308 AM PDT SUN AUG 9 2026
KEY MESSAGES
- DRY, WARM AND BREEZY CONDITIONS WILL PERSIST THROUGH THE
EARLY PORTION OF THE WEEK.
- A TROUGH WILL MOVE ACROSS THE REGION AROUND MIDWEEK AND COULD
BRING SOME LIGHT SHOWERS TO THE WASHINGTON CASCADES.
- ANOTHER LOW CHANCE OF SHOWERS/THUNDERSTORMS COMES TOWARDS THE
END OF THE WEEK/MAINLY OVER THE MOUNTAINS OF CENTRAL/EASTERN
OREGON.
DISCUSSION
DRY WESTERLY FLOW WILL REMAIN IN PLACE THROUGH TUESDAY.
WINDS TODAY WILL MAINLY BE IN THE 20 TO 25 MPH RANGE, POSSIBLY
AS HIGH AS 30 MPH ACROSS THE KITTITAS VALLEY, SIMCOE HIGHLANDS,
COLUMBIA BASIN AND GORGE. WITH TEMPERATURES A FEW DEGREES COOLER
THAN ON SATURDAY AND WINDS A BIT LIGHTER, FIRE WEATHER CONCERNS
WILL DECREASE BUT REMAIN ELEVATED.
ON MONDAY, WITH THE EXCEPTION OF THE KITTITAS VALLEY, WINDS
WILL DECREASE A BIT, TEMPERATURES REMAIN ABOUT THE SAME AND
HUMIDITY INCREASES SLIGHTLY SO FIRE WEATHER CONCERNS WILL STILL
BE ELEVATED. BY TUESDAY, WINDS SHOULD DECREASE EVEN FURTHER.
ON WEDNESDAY, LOW PRESSURE WILL DROP SOUTH FROM BRITISH
COLUMBIA, AND CREATE A TROUGH OVER THE PACIFIC NORTHWEST, WHICH
WILL FLATTEN BY LATER THURSDAY AS THE LOW WEAKENS AND MOVES
NORTHEAST. WHILE THE TROUGH IS GENERALLY EXPECTED TO REMAIN
DRY, IT IS POSSIBLE THAT THERE COULD BE SOME LIGHT SHOWERS TO
THE WASHINGTON CASCADES.
DRY WESTERLY FLOW RETURNS FOR THURSDAY.
BY FRIDAY INTO SATURDAY, THE FLOW BECOMES SOUTHWESTERLY IN
RESPONSE TO LOW PRESSURE DEVELOPING IN THE GULF OF ALASKA AND
MOVING SOUTHEAST. BY FRIDAY, AND EVEN MORE SO BY SATURDAY, THERE
IS A LOW PROBABILITY (<20 PERCENT) OF SHOWERS AND THUNDERSTORMS
MAINLY OVER THE MOUNTAINS OF EASTERN AND CENTRAL OREGON. WHILE
OVERALL QPF WILL BE LIGHT, THERE COULD BE AT LEAST SOME RAIN.
BUT OF COURSE WITH ANY THUNDERSTORMS COMES LIGHTNING AND THE
THREAT OF NEW FIRE STARTS.
AVIATION /06Z TAFS THROUGH 06Z MONDAY/
VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD. WINDS WILL
GUST 20 TO 25 KTS AT ALL SITES THIS AFTERNOON AND EVENING EXCEPT
ALW AND PSC. WINDS WILL DECREASE THIS EVENING AND OVERNIGHT TO
10 KTS OR LESS, EXPECT AT DLS WHERE THEY WILL REMAIN GUSTY
THROUGH THE PERIOD. AT ALW AND PSC, WINDS SHOULD STAY 10 KTS OR
LESS THROUGHOUT.
PRELIMINARY POINT TEMPS/POPS
PDT 89 54 88 55 / 0 0 0 0
ALW 91 61 89 61 / 0 0 0 0
PSC 92 57 92 57 / 0 0 0 0
YKM 93 59 92 59 / 0 0 0 0
HRI 91 59 91 58 / 0 0 0 0
ELN 88 56 86 56 / 0 0 0 0
RDM 90 46 89 47 / 0 0 0 0
LGD 92 53 90 53 / 0 0 0 0
GCD 93 53 91 53 / 0 0 0 0
DLS 90 60 89 60 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...AIR QUALITY ALERT UNTIL 5 AM PDT TUESDAY FOR WAZ024-026>030-
521>523.
OR...AIR QUALITY ALERT UNTIL NOON PDT MONDAY FOR ORZ041-044-049-050-
502-503-505>511.
DISCUSSION...77
AVIATION...77
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