083
FXUS66 KPDT 170534
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1034 PM PDT TUE SEP 16 2025
.UPDATED AVIATION DISCUSSION.
AVIATION...06Z TAFS
VFR CONDITIONS CURRENTLY ACROSS ALL SITES,
WHICH WILL STAY THE COURSE THROUGH THE PERIOD. CLEAR SKIES AND LOW
WINDS BELOW 10 KTS WILL PERSIST THROUGH THE PERIOD. WIND DIRECTIONS
WILL BE DIURNALLY-DRIVEN, UPSLOPE BY LATE MORNING SWITCHING DO
DOWNSLOPING IN THE EVENING. 75
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
AVIATION...18 TAFS...AN EAST TO WEST DIRECTED SURFACE PRESSURE
GRADIENT WAS IN PLACE ACROSS THE REGION THIS MORNING WHILE GOES
SATELLITE SHOWED DRY AIR IN THE MID AND LOW LEVELS AS CLEAR SKY
PREVAILED REGION WIDE. VFR CONDITIONS ARE ANTICIPATED THROUGH THE
TAF PERIOD AS PREVAILING WINDS REMAIN LIGHT EAST TO NORTHEASTERLY
WITH LOCAL TERRAIN EFFECTS, WITH THE EXCEPTION OF DLS WHERE
OCCASIONAL GUSTS WINDS TO AROUND 20 KNOTS CAN BE EXPECTED THROUGH
00 UTC.
PRELIMINARY POINT TEMPS/POPS
PDT 52 85 54 85 / 0 0 0 0
ALW 58 87 59 87 / 0 0 0 0
PSC 50 86 52 86 / 0 0 0 0
YKM 53 87 55 87 / 0 0 0 0
HRI 51 86 54 86 / 0 0 0 0
ELN 48 86 52 85 / 0 0 0 0
RDM 43 85 45 83 / 0 0 0 0
LGD 47 85 49 86 / 0 0 0 0
GCD 47 87 50 88 / 0 0 0 0
DLS 57 87 57 86 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
SHORT TERM...97
LONG TERM....97
AVIATION...75
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