215
FXUS66 KPDT 091733
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1033 AM PDT TUE SEP 9 2025
.UPDATED AVIATION.
AVIATION...18Z TAFS
SHOWERS AND STORMS ARE POPPING UP ACROSS
THE REGION. NOT TOO CONFIDENT ABOUT DIRECT HITS WITH AIRWAYS, BUT
HAVE PUT IN VCSH FOR YKM/BDN/RDM. HAVE ALSO ENTERED PROB30 FOR THE
AIRWAYS ACROSS THE COLUMBIA BASIN IN THE OVERNIGHT HOURS. WINDS
WILL BE LIGHT EXCEPT FOR AREAS NEAR STRONG STORMS THAT COULD
PRODUCE ERRATIC WIND GUSTS.
PREV DISCUSSION... /ISSUED 134 PM PDT MON SEP 8 2025/
DISCUSSION...
AN UPPER LOW, CURRENTLY OFF THE COAST OF NORTHERN CALIFORNIA AND
SOUTHERN OREGON WILL MOVE ONSHORE TONIGHT INTO EARLY TUESDAY. THIS
LOW AND TROUGH ASSOCIATED WITH IT REMAIN OVER THE WESTERN STATES
THROUGH MUCH OF THE UPCOMING WEEK BEFORE MOVING EASTWARD FRIDAY
NIGHT INTO SATURDAY. TRANSIENT RIDGING WILL MOVE OVER THE AREA FOR
SATURDAY BEFORE ANOTHER TROUGH POSSIBLY IMPACTS THE REGION EARLY
NEXT WEEK.
WITH THE UPPER LOW AND TROUGH, CONDITIONS LOOK TO BE UNSETTLED FOR
MUCH OF THE WEEK. THUNDERSTORM CHANCES ARE HIGHEST TODAY THROUGH
WEDNESDAY, WITH HIGHEST CHANCES TODAY OVER CENTRAL OREGON THEN
ACROSS THE HIGHER ELEVATIONS OF CENTRAL AND EASTERN OREGON
TUESDAY AND THEN THE CHANCES SHIFT EAST ON WEDNESDAY TO MAINLY
EASTERN OREGON. HOWEVER, BY WEDNESDAY, OVERALL POPS INCREASE AS
WELL WITH SOME AREAS SEEING LIKELY OR HIGHER CHANCES.
QPF VALUES ARE FAIRLY LOW TODAY AND TUESDAY, MAINLY DUE TO THE
NATURE OF THUNDERSTORMS. HOWEVER, BY WEDNESDAY, RAIN BECOMES MORE
WIDESPREAD AND AMOUNTS, ESPECIALLY FOR THE HIGHER TERRAIN FROM
CENTRAL OREGON TO EASTERN OREGON WILL INCREASE. SOME OF THESE
AREAS WILL SEE QPF BETWEEN 0.50 TO 1.00 INCH.
THE ECMWF EFI DOES FOCUS IN ON SOME ANOMALOUS QPF VALUES ON
TUESDAY, IN CENTRAL OREGON, WITH VALUES IN THE 0.7 TO 0.8 RANGE
AND ON WEDNESDAY THE 0.7 TO 0.8 RANGE IS A BIT MORE WIDESPREAD.
HIGH TEMPERATURES WILL BE AROUND OR SLIGHTLY BELOW NORMAL THROUGH
THE WEEK.
PRELIMINARY POINT TEMPS/POPS
PDT 57 79 57 74 / 40 40 70 70
ALW 61 81 62 75 / 30 30 60 70
PSC 58 83 59 79 / 20 20 40 50
YKM 57 84 58 83 / 20 30 20 30
HRI 59 82 59 78 / 30 40 50 60
ELN 53 83 56 80 / 30 30 20 30
RDM 48 71 49 72 / 50 60 60 50
LGD 51 78 54 70 / 40 50 80 80
GCD 50 72 53 68 / 40 70 80 70
DLS 60 81 62 78 / 30 40 30 40
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
SHORT TERM...77
LONG TERM....77
AVIATION...95
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page