606
FXUS66 KPDT 082034
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
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.
AVIATION
18Z TAFS...VFR CONDITIONS ARE GENERALLY EXPECTED. TSRA ARE POSSIBLE
THIS AFTERNOON AND EVENING, MAINLY AT BDN AND RDM. DUE TO
INCONSISTENCIES ON TIMING, HAVE OPTED TO NOT INCLUDE AT THIS
TIME.
OTHERWISE, RA WILL DEVELOP AT BDN AND RDM LATE THIS AFTERNOON AND
CONTINUE THIS EVENING AND DEVELOP EVERYWHERE ELSE DURING TUESDAY
MORNING (EXCEPT AT PSC). WINDS WILL GENERALLY BE 10 KTS OR LESS,
OUTSIDE OF ANY TSRA. HOWEVER, DLS WILL HAVE SOME GUSTY WINDS
BETWEEN 25 AND 30 KTS THIS AFTERNOON.
PRELIMINARY POINT TEMPS/POPS
PDT 83 57 80 56 / 20 40 40 40
ALW 85 60 80 59 / 10 40 40 40
PSC 87 58 82 57 / 10 40 40 30
YKM 83 59 80 56 / 10 40 60 30
HRI 87 58 83 57 / 10 50 40 30
ELN 81 55 79 53 / 10 40 70 40
RDM 77 49 72 47 / 70 70 80 50
LGD 80 50 77 52 / 30 30 50 50
GCD 80 50 77 50 / 20 20 50 40
DLS 82 62 80 60 / 20 70 60 30
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
SHORT TERM...77
LONG TERM....77
AVIATION...77
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