612
FXUS66 KPDT 090507
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1007 PM PDT MON SEP 8 2025
UPDATED AVIATION...06Z TAFS
VFR CONDITIONS WILL PREVAIL THROUGH
THE FORECAST PERIOD. THERE WILL BE VCTS LINGERING FOR A FEW HOURS
UNTIL AROUND 08Z FOR PSC/PDT/BDN/RDM AS THESE STORMS CONTINUE TO
DEVELOP TO THE SOUTH AND MOVE NORTH INTO POCKETS OF INSTABILITY.
GUSTY OUTFLOWS OF UP TO 15-25 MPH HAVE BEEN REPORTED AS THE
STORMS PASS OVER OBSERVATION SITES. CG HAS BEEN LIMITED WITH MUCH
OF THE LIGHTNING BEING IN CLOUD, HOWEVER, PSC HAS SEEN ROUGHLY
20-30 STRIKES WITHIN A 10 MILE RADIUS OF THE TERMINAL. CURRENT OBS
SHOW THE STORMS TO HAVE MOVED OFF TO THE NORTHEAST THE AWW WILL
BE ALLOWED TO EXPIRE. VSBY HAS NOT DETERIORATED WITH THESE STORMS
AS THERE IS NOT AN ABUNDANT AMOUNT OF PRECIPITATION THAT HAS
ACCOMPANIED THEM. STORMS ARE EXPECTED TO DIMINISH AFTER 07Z.
CIGS WILL BE MOSTLY 10KFT AND ABOVE WITH AN OCCASIONAL POCKET OF
7-9KFT. OTHERWISE, OUTSIDE OF THUNDERSTORM OUTFLOWS, WINDS WILL BE
MOSTLY DIURNAL DRIVEN AND BELOW 10 KTS WITH THE EXCEPTION OF AT
DLS WHERE SUSTAINED WINDS 10-15KTS AND GUSTS UP TO 25 KTS WILL
CONTINUE OVERNIGHT. BENNESE/90
PREV DISCUSSION
/ISSUED 558 PM PDT MON SEP 8 2025/
UPDATED AVIATION DISCUSSION...
AVIATION...00Z TAFS...VFR CONDITIONS PREVAIL THROUGH THE TAF
PERIOD. DUE TO THE UPSLOPE FLOW INFLUENCED BY THE CLOSED LOW OFF
CALIFORNIA COAST, THIS WILL INDUCE MORE SHOWERS FOR MOST SITES
DURING THIS EVENING WITH ISOLATED TO SCATTERED THUNDERSTORMS FOR
KRDM/KBDN AS WELL. WHILE CONVECTION MAY WEAKEN OVERNIGHT, SHOWERS
COULD LINGER TOMORROW MORNING FOR KDLS/KPDT/KYKM. NO CONVECTION IS
EXPECTED AT THIS TIME FOR KPSC. MAIN THREATS TO WATCH OUT FOR WOULD
BE CLOUD-TO-GROUND LIGHTNING AND SMALL HAIL. GUSTY OUTFLOW WINDS
(30-40KTS) ARE POTENTIAL, THOUGH WITH A SLIGHT CHANCE (<20%).
FEASTER/97
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 80 56 78 / 40 40 40 50
ALW 60 80 59 79 / 40 40 40 40
PSC 58 82 57 82 / 40 40 30 30
YKM 59 80 56 82 / 40 60 30 40
HRI 58 83 57 81 / 50 40 30 40
ELN 55 79 53 81 / 40 70 40 40
RDM 49 72 47 69 / 70 80 50 60
LGD 50 77 52 74 / 30 50 50 70
GCD 50 77 50 70 / 20 50 40 80
DLS 62 80 60 79 / 70 60 30 40
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
SHORT TERM...77
LONG TERM....77
AVIATION...90
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