444
FXUS66 KPDT 050837
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
137 AM PDT SUN OCT 5 2025
DISCUSSION
SCATTERED LIGHT SHOWERS TO OUR NORTHEAST WILL
DISSIPATE BY THE EARLY MORNING AS AN UPPER-LEVEL NORTHWESTERLY WAVE
MOVES OUT OF THE REGION. REPLACING IT WILL BE A HIGH PRESSURE RIDGE,
BUT AS WE TRANSITION BETWEEN THE TWO, COOL NORTHERLY FLOW WILL
PREVAIL OVER THE FORECAST AREA HEADING INTO MONDAY. WITH THIS, SKIES
WILL CLEAR, AND MANY OF OUR ELEVATED VALLEYS WILL SEE A CHANCE FOR
THEIR FIRST HARD FREEZE OF THE SEASON, INCLUDING CENTRAL OREGON, THE
JOHN DAY BASIN, WALLOWA VALLEY, AND THE GRANDE RONDE VALLEY.
DOWNSLOPING WINDS MAY SHELTER SOME OF THESE VALLEYS FROM
PARTICULARLY EFFICIENT RADIATIONAL COOLING, BUT OTHERWISE THE
SYNOPTIC SETUP IS IDEAL FOR A COLD SUNDAY NIGHT / EARLY MONDAY
MORNING. WILL OPT TO UPGRADE OUR CURRENT FREEZE WATCHES INTO
WARNINGS AS A RESULT.
MONDAY AND TUESDAY LOOK DRY WITH THE AFOREMENTIONED RIDGE OVERHEAD,
BEFORE OUR NEXT CHANCES FOR PRECIP MATERIALIZE BY WEDNESDAY. MODELS
DEPICT A BROAD LOW PRESSURE SYSTEM CENTERING ITSELF OFF THE PACIFIC
COAST BY THE MIDWEEK, BUT HOLD OFF ON ANY SUBSTANTIAL MOISTURE
ADVECTION UNTIL AROUND THE END OF THE WORK WEEK. WE'LL SEE LOW-END
CHANCES FOR RAIN ACROSS THE CASCADES WEDNESDAY INTO THURSDAY (15-
25%), BEFORE POPS BECOME MORE WIDESPREAD BY FRIDAY. ENSEMBLES HAVE
THIS SYSTEM UNDERGOING A SLOW PROGRESSION HEADING INTO NEXT WEEKEND,
SO THE FORECAST CONFIDENCE IS MODERATE-HIGH (50-60%) IN SEEING COOL
AND WET CONDITIONS FRIDAY ONWARD. EVANS/74
AVIATION...06Z TAFS (PREVIOUS DISCUSSION)
VFR CONDITIONS WILL
PREVAIL THROUGH SUNDAY. WINDS WILL GENERALLY BE 10 KTS OR LESS,
THOUGH SOME AFTERNOON WINDS IN THE 10 TO 15 KT RANGE ARE POSSIBLE
AT BDN AND RDM.
PRELIMINARY POINT TEMPS/POPS
PDT 65 38 68 39 / 0 0 0 0
ALW 65 41 68 44 / 0 0 0 0
PSC 69 35 70 36 / 0 0 0 0
YKM 67 39 69 39 / 0 0 0 0
HRI 68 37 70 37 / 0 0 0 0
ELN 65 34 68 36 / 0 0 0 0
RDM 62 27 68 30 / 0 0 0 0
LGD 62 33 67 36 / 0 0 0 0
GCD 63 32 69 36 / 0 0 0 0
DLS 72 43 73 43 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...FREEZE WARNING FROM MIDNIGHT TONIGHT TO 10 AM PDT MONDAY FOR
ORZ049-050-505-511.
WA...NONE.
SHORT TERM...74
LONG TERM....74
AVIATION...77
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