504
FXUS66 KPDT 171703
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1003 AM PDT WED SEP 17 2025
UPDATED AVIATION DISCUSSION
AVIATION...18Z TAFS
VFR CONDITIONS PREVAIL THROUGH THE TAF
PERIOD WITH WINDS LESS THAN 12KTS. FEASTER/97
PREV DISCUSSION... /ISSUED 204 PM PDT TUE SEP 16 2025/
DISCUSSION
TODAY THROUGH THURSDAY: QUIET WEATHER WILL PREVAIL
FOR THE NEXT COUPLE DAYS WITH WARM, DRY CONDITIONS FROM THE HIGH
PRESSURE SYSTEM WITH A THERMAL TROUGH. THIS WILL PROMOTE EASTERLY
WINDS THROUGH THIS EVENING ACROSS MAINLY THE WA/OR CASCADES AND
THE GORGE AS WELL. THURSDAY WILL HAVE THE SHORTWAVE APPROACHING
ACROSS TO THE PACNW AS THE UPPER RIDGE MOVES FURTHER OUT OF THE
AREA. HOWEVER, THE DETERMINISTIC MODELS AND ENSEMBLES ARE IN FAVOR
OF DRYNESS OVER THE FORECAST AREA. THAT SAID, NO SHOWERS WILL BE
EXPECTED FOR THURSDAY. HIGH TEMPERATURES ARE EXPECTED TO REACH THE
MID-70S TO LOW 80S TODAY AND MOSTLY MID TO HIGH 80S WEDNESDAY.
NBM SUGGESTS A 50-90% PROBABILITY OF TEMPS AT 85 DEGREES OR HIGHER
FOR WEDNESDAY. DAYTIME RHS WILL BE IN THE 30S FOR THE LOWER
ELEVATIONS THROUGH THURSDAY WITH OVERNIGHT RH RECOVERIES BECOMING
MODERATE TO GOOD.
FRIDAY THROUGH TUESDAY: DRY CONDITIONS WILL CONTINUE THROUGH
SATURDAY MORNING WITH A TRANSIENT RIDGE MOVING OVER THE FORECAST
AREA. STARTING SATURDAY EARLY EVENING INTO SUNDAY, WE WILL HAVE MORE
OF A ZONAL PATTERN ASSOCIATED WITH A FRONTAL SYSTEM APPROACHING THE
PACNW. THIS MAY BRING LIGHT SHOWERS ALONG THE WA/OR CASCADES. THE
RAW ENSEMBLES HAS A 30-40% PROB FOR PRECIP UP TO 0.10". WE MIGHT
HAVE A BREAK ON MONDAY DUE TO THE PASSING TRANSIENT RIDGE. HOWEVER,
LIGHT SHOWERS MAY RETURN TUESDAY MORNING AT THE CASCADES BEFORE
SPREADING TO OTHER MOUNTAIN AREAS TUESDAY EVENING (<20% CONFIDENCE).
WINDS WILL BE LIGHT, TERRAIN-DRIVEN FRIDAY, THOUGH MAY BECOME BREEZY
(15-25 MPH) WITH GUSTS AT 20-30 MPH OVER THE WEEKEND WITH THE
APPROACHING FRONTAL SYSTEM. FEASTER/97
PRELIMINARY POINT TEMPS/POPS
PDT 84 54 83 55 / 0 0 0 0
ALW 86 59 85 59 / 0 0 0 0
PSC 85 53 85 53 / 0 0 0 0
YKM 87 54 85 54 / 0 0 0 0
HRI 85 54 84 53 / 0 0 0 0
ELN 84 52 82 50 / 0 0 0 0
RDM 83 45 82 46 / 0 0 0 0
LGD 85 49 86 51 / 0 0 0 0
GCD 87 51 88 53 / 0 0 0 0
DLS 87 58 84 56 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
DISCUSSION...97
AVIATION...97
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