429
FXUS66 KPDT 180552
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1052 PM PDT THU SEP 17 2026
KEY MESSAGES
- SHOWERS (30-70%) AND ISOLATED THUNDERSTORMS (15-30%)THROUGH
THIS EVENING, AND AGAIN ON FRIDAY, MAINLY FROM THE BLUE
MOUNTAINS EASTWARD.
- DRY WEATHER FROM SATURDAY THROUGH MUCH OF NEXT WEEK, WITH
WARMING TEMPERATURES THROUGH THE WEEKEND.
DISCUSSION
AN UPPER LEVEL LOW PRESSURE SYSTEM WILL MOVE SLOWLY
NORTHEASTWARD THROUGH FRIDAY AND THEN FURTHER EAST AND OUT OF
THE AREA ON SATURDAY. IN THE MEANTIME, IT WILL BRING SCATTERED
SHOWERS, AND ISOLATED THUNDERSTORMS THROUGH THIS EVENING, MAINLY
ALONG AND FROM BEND/REDMOND TO PENDLETON TO WALLA WALLA AND
POINTS EASTWARD.
ON FRIDAY, ANY SHOWERS AND THUNDERSTORMS SHOULD BE FROM THE
BLUE MOUNTAINS EASTWARD, AS THE LOW MOVES. BEYOND FRIDAY, HIGH
PRESSURE WILL BUILD OVER THE PACIFIC NORTHWEST AND DRY WEATHER
WITH WARMING TEMPERATURES ARE EXPECTED, WITH HIGHS EVEN REACHING
ABOVE NORMAL.
THE RIDGE WILL BREAK DOWN BY MONDAY AND BECOME MORE ZONAL AND
WESTERLY, THEN SOUTHWESTERLY IN RESPONSE TO LOW PRESSURE IN THE
PACIFIC OCEAN. HOWEVER, DRY WEATHER WILL CONTINUE, THOUGH
TEMPERATURES WILL COOL AND BE A FEW DEGREES BELOW NORMAL THROUGH
MIDWEEK.
ON TUESDAY, THERE LOOKS TO BE SOME BREEZY WINDS THROUGH THE
CASCADE GAPS, COLUMBIA BASIN AND GORGE THAT COULD REACH 20 TO 25
MPH AND POSSIBLY 30 MPH. ALSO BY MIDWEEK, LOW RELATIVE
HUMIDITIES WILL RETURN TO CENTRAL OREGON. HOWEVER, LIGHTER WINDS
ARE EXPECTED. THERE COULD BE SOME PERIODS OF LOCALLY ELEVATED
FIRE WEATHER CONCERNS, BUT NO WIDESPREAD CRITICAL CONDITIONS
ARE EXPECTED.
AVIATION /06Z TAFS THROUGH 06Z SATURDAY/
SHOWERS ARE EXPECTED TO CONTINUE FOR THE BEGINNING OF THE TAF
PERIOD, HOWEVER CONFIDENCE IS LOW (LESS THAN 30%) THAT THESE
SHOWERS WILL EXTEND BEYOND 09Z FRIDAY. AS SUCH, VFR CONDITIONS
WILL LARGELY PREVAIL THROUGH THE TAF PERIOD. THERE IS HIGH
CONFIDENCE (GREATER THAN 70%) THAT CLOUD COVER WILL BE MINIMAL
PAST 09Z WITH ANY CLOUDS THAT DO FORM REMAINING 15 KFT OR ABOVE.
CONFIDENCE IS LIKEWISE HIGH (GREATER THAN 70%) THAT PREVAILING
WINDS WILL REMAIN UNDER 10 KNOTS FOR MOST SITES, THOUGH IT IS
FEASIBLE (30-50% CHANCE) THAT WIND GUSTS COULD BE AS HIGH AS
15-20 KNOTS LOCALLY AS THE REGION TRANSITIONS TO STANDARD,
DIURNAL WIND PATTERNS. CONFIDENCE REMAINS LOW (UNDER 30%) THAT
WIND GUSTS WILL EXCEED 20 KNOTS, ESPECIALLY BY FRIDAY EVENING.
PRELIMINARY POINT TEMPS/POPS
PDT 50 77 47 79 / 60 10 0 0
ALW 55 77 54 79 / 70 10 0 0
PSC 52 81 50 82 / 10 0 0 0
YKM 52 81 50 81 / 0 0 0 0
HRI 53 81 50 82 / 30 0 0 0
ELN 51 77 49 77 / 0 0 0 0
RDM 41 75 39 78 / 40 0 0 0
LGD 48 74 46 78 / 70 10 10 0
GCD 48 74 46 78 / 70 10 0 0
DLS 57 82 54 84 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...77
AVIATION...21/86
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