997
FXUS66 KPDT 231125
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
325 AM PST TUE DEC 23 2025
DISCUSSION
A WEAK SYSTEM WAS MOVING ACROSS THE CASCADES AND BRINGING SOME
LIGHT SNOW TO THE AREA. THIS SYSTEM WILL WEAKEN BY AFTERNOON.
THEN, SOME MOISTURE FROM THE SOUTHEAST WILL MOVE NORTHWESTWARD
DURING THE AFTERNOON, AND WILL WEAKEN AS IT MOVES AND COULD
TRIGGER SOME SHOWERS ALONG THE WAY.
ON WEDNESDAY, MOISTURE FROM CALIFORNIA WILL MOVE NORTHWARD,
HOWEVER, THE LATEST GUIDANCE HAS THE MAJORITY OF THIS MOISTURE
STAYING TO OUR WEST AND EAST. SO WHILE THERE COULD DEFINITELY BE
SOME PRECIPITATION, THE BEST CHANCES REMAIN IN THE IN THE
MOUNTAINS AND OVERALL QPF IS LIGHT, AND MUCH OF THE AREA SHOULD BE
DRY LATER WEDNESDAY INTO WEDNESDAY EVENING.
AS LOW PRESSURE MOVES NORTHWARD OFF THE CALIFORNIA COAST TO OFF
THE OREGON COAST LATER WEDNESDAY INTO THURSDAY, AND OTHER BATCH
OF MOISTURE WILL ACCOMPANY IT. ONCE AGAIN, THERE WILL BRING SOME
PRECIPITATION TO THE AREA, WITH THE BEST CHANCES OVER THE CASCADES
AND LIGHT PRECIPITATION AND LOW (20-40 PERCENT) CHANCES
ELSEWHERE. SOME PRECIPITATION CHANCES WILL LINGER INTO FRIDAY, AS
THE UPPER LOW OFF THE COAST WEAKENS AND THE TROUGH MOVES INLAND
BUT STAYS MAINLY SOUTH OF THE AREA.
FINALLY, BY LATER FRIDAY INTO THE WEEKEND AND EARLY NEXT WEEK, A
RIDGE WILL BUILD OVER THE PACIFIC NORTHWEST. THIS RIDGE WILL BRING
DRY WEATHER AND NEAR NORMAL TEMPERATURES.
ON WEDNESDAY, AS THE LOW APPROACHES, THE PRESSURE GRADIENT WILL
TIGHTEN AND WINDS WILL INCREASE, ESPECIALLY OVER THE HIGHER
TERRAIN. WINDS OF 15 TO 25 MPH WITH GUSTS 30 TO 35 MPH AND SOME
LOCAL GUSTS TO 40 MPH ARE POSSIBLE. THE NBM PROBABILITIES OF WIND
GUSTS >= 39 MPH ARE 50 TO 80 PERCENT FROM CENTRAL OREGON TO
NORTHEASTERN OREGON. THE NBM PROBABILITIES OF WIND GUSTS >= 47
MPH ARE 30 TO 60 PERCENT ACROSS THIS SAME AREA.
AVIATION
12Z TAFS...OVERNIGHT WE’VE SEEN LOW STRATUS AT DLS WHICH HAS
SINCE SCATTERED OUT. THIS WILL BEAR WATCHING FOR OVERNIGHT TO
RETURN AS THE HREF HAS NOT HANDLED IT WELL, WITH ONLY A 10 PERCENT
OR LESS CHANCE FOR CEILINGS UNDER 1000FT, WHILE THE CHANCES
INCREASE TO AROUND 20% THROUGH AT LEAST 18Z. ADDITIONALLY IFR
VISIBILITY HAS DEVELOPED IN THE 1 TO 2 MILE AREA. A WEAK WARM
FRONT WILL LIFT NORTH TODAY AND BECOME STATIONARY. OVERALL LIGHT
WINDS AT ALL TERMINALS AND DIRECTIONS SPLIT BETWEEN MORE
NORTHEASTERLY FOR ALL SITES OTHER THAN BDN AND RDM, WHICH ARE
SOUTH OF THE BOUNDARY WITH WINDS OUT OF THE SOUTHEAST.
DETERIORATING CEILINGS AND VISIBILITY BETWEEN 00 AND 06Z IS
POSSIBLE AS PSC AND BDN /RDM GETTING DOWN BELOW THE IFR 1000 FT
THRESHOLDS.
PRELIMINARY POINT TEMPS/POPS
PDT 45 34 50 35 / 60 40 30 20
ALW 45 37 50 38 / 60 50 40 30
PSC 43 35 48 32 / 40 60 30 20
YKM 41 32 45 29 / 10 90 50 20
HRI 43 35 49 33 / 50 60 30 20
ELN 37 29 40 27 / 0 90 70 20
RDM 43 31 50 29 / 50 40 30 10
LGD 43 38 49 39 / 80 20 50 40
GCD 48 40 51 36 / 90 20 60 40
DLS 43 38 47 35 / 30 80 50 30
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
SHORT TERM...77
LONG TERM....77
AVIATION...71
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