417
FXUS66 KPDT 201136
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
436 AM PDT SUN SEP 20 2026
KEY MESSAGES
- WARMING TREND THROUGH MONDAY WITH HIGHS IN THE LOW TO MID 80S
IN THE LOWER ELEVATIONS. COOLER TEMPERATURES TOWARDS THE MID
TO LATE WEEK.
- NEXT POSSIBLE WEATHER SYSTEM PUSHING TOWARDS THE END OF THE
WEEK, WITH CHANCES OF MOUNTAIN SHOWERS GOING UP.
- LIGHT DIURNAL WINDS PREVAIL, WITH THE EXCEPTION OF BREEZY
WINDS IN THE CASCADE GAPS TUESDAY AND WEDNESDAY.
DISCUSSION
ZONAL/SLIGHT RIDGING CONTINUES TO PREVAIL THE AREA, CONTINUING
THE DRY AND CLEAR PATTERN AND WILL CONTINUE TO DO SO THROUGH THE
NEXT COUPLE OF DAYS. THE WARMING TREND CONTINUES THROUGH MONDAY
WHEN HIGHS PEAK IN THE LOW TO MID 80S ACROSS THE LOWER
ELEVATION AREAS. WINDS WILL BE MOSTLY LIGHT AND VARIABLE WITH
DIURNAL WINDS WITH THE EXCEPTION OF BREEZY WINDS DEVELOPING IN
THE CASCADE GAPS TUESDAY AND WEDNESDAY.
OUR NEXT WEATHER MAKER WILL OCCUR IN THE LATE PART OF THIS WEEK
AS A TROUGH/SHORTWAVE OFF BRITISH COLOMBIA PUSHES INTO THE PACNW
(30-50% CHANCE). MODELS STRUGGLE HOW TO HANDLE THE SYSTEM AS WE
GET CLOSE TO THE WEEKEND, AS THERE'S NOT A CONCISE CONCLUSION
WITH CLUSTERS AND GUIDANCE ON TIMING AND STRENGTH OF THE TROUGH.
CONFIDENCE IS RATHER LOW (10-30%) THAT THE LOWER ELEVATION
AREAS WILL SEE PRECIPITATION, WHILE HIGHER CONFIDENCE IS PLACED
ON THE MOUNTAIN REGIONS (50-70% CHANCE) BY FRIDAY AND SATURDAY.
FOR MORE IN-DEPTH WITH THE CLUSTERS, 27% OF MEMBERS WANT TO
BRING A WET PATTERN IN THE LOWER ELEVATIONS BY FRIDAY AFTERNOON
WITH A STRONGER TROUGH ADVERTISED, WHILE THAT NUMBER JUMPS TO
AROUND 70% FOR THE AREAS IN THE MOUNTAINS. STILL TIME TO MONITOR
THIS SYSTEM, BUT NOT EXPECTING ANY SIGNIFICANT IMPACTS WITH THIS
SYSTEM AT THE TIME WITH PLENTY OF TIME TO MONITOR FOR ANY
EVOLVING DETAILS OVER THE NEXT FEW DAYS.
AVIATION /12Z TAFS THROUGH 12Z MONDAY/
VFR CONDITIONS PREVAIL THROUGH THE PERIOD WITH LIGHT AND
VARIABLE WINDS. DRY CONDITIONS PREVAIL WITH SKC TO SCT
CONDITIONS THROUGH THE PERIOD. NO CIG OR VIS ISSUES EXPECTED.
PRELIMINARY POINT TEMPS/POPS
PDT 83 50 84 53 / 0 0 0 0
ALW 85 56 85 59 / 0 0 0 0
PSC 86 52 87 53 / 0 0 0 0
YKM 84 54 85 54 / 0 0 0 0
HRI 85 53 86 54 / 0 0 0 0
ELN 79 52 80 51 / 0 0 0 0
RDM 84 45 84 45 / 0 0 0 0
LGD 83 51 84 52 / 0 0 0 0
GCD 84 50 85 51 / 0 0 0 0
DLS 88 59 86 56 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...95
AVIATION...95
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page