320
FXUS66 KPDT 191125
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
325 AM PST MON JAN 19 2026
UPDATED AVIATION DISCUSSION
AVIATION...12Z TAFS
WIDESPREAD MVFR AND WORSE CONDITIONS WILL
CONTINUE AS A STAGNANT LOW STRATUS DECK PERSISTS OVER THE AREA.
FOR SITES OUTSIDE OF CENTRAL OREGON, EXPECT CIGS TO BE LESS THAN 2
KFT OVC THROUGH THE PERIOD. FOR BDN/RDM, PATCHY FOG WILL CONTINUE
THROUGH THE EARLY MORNING, WITH WEATHER MODELS SUGGESTING SOME
CLEARING THIS AFTERNOON, BEFORE THE LOW CLOUD DECK IS EXPECTED TO
MOVE BACK IN LATER THIS EVENING. CONFIDENCE ON THIS OCCURRING IS
MODERATE AT 50-60%, BUT WOULD NOT BE SURPRISED IF THE CURRENT LOW
CLOUD DECK PERSISTED FOR SLIGHTLY LONGER THAN WHAT MODELS ARE
SUGGESTING AT THIS TIME. 74
PREV DISCUSSION
/ISSUED 257 AM PST MON JAN 19 2026/
DISCUSSION...
A FEW PATCHY FOGGY SPOTS THIS MORNING, MAINLY AROUND AND ABOVE
2500 FT EL SUCH AS RYEGRASS SUMMIT ON I-90 AND ON I-84 CABBAGE
HILL/DEADMANS PASS AREAS AND OCCASIONALLY BEND, HAVE BEEN SEEN ON
METARS/ MESONET STATIONS. THE PATCHY NATURE OF IT WILL PRECLUDE
ANY HEADLINES THIS MORNING.
THE LREF MEAN 500 MB HEIGHT PATTERN MAINTAINS/REINFORCES
AN AMPLIFIED UPPER RIDGE ALONG THE PAC NW COAST, MAINTAINING
NORTHWEST FLOW ALOFT ACROSS THE PDT CWA. A RESULTANT STAGNANT AIR
MASS PATTERN REMAINS IN PLACE OVER THE NEXT SEVERAL DAYS AS
TRANSPORT WINDS REMAINS LARGELY WELL BELOW 10 MPH. ADDITIONALLY,
THE TOP OF THE WELL MIXED LAYER IS LIMITED TO AROUND 1500 AGL EACH
AFTERNOON AND A STAGNATION ADVISORY REMAINS IN PLACE THROUGH
TUESDAY MORNING.
HIGH TEMPERATURES ARE NEARLY UNCHANGED GOING FORWARD THIS WEEK
WITH NBM HIGHS IN THE MID AND UPPER 30S ACROSS THE LOW LAND AREAS,
AND MORE MILD 40S TO LOW 50S IN THE HIGHLANDS/SOUTHERN
BLUES/CENTRAL OREGON. LIKEWISE OVERNIGHT LOWS IN THE LOW 30S
ACROSS THE LOW LANDS WITH MID TO UPPER 20S ACROSS THE HIGHLANDS.
A 38N/135W CENTERED ANTICYCLONE IS THE MODELS/ENSEMBLES FOCAL
POINT FOR AN AR CHARACTERIZED BY WEAK 250-400 KG/MS IVT LATE THIS
WEEK. IN NEITHER CASE (EC OR GFS) DOES THE AR MOVE ON LAND FOR
THE DAY 5/6 TIME FRAME AS COMPARED TO 1 DAY AGO IN THE MODELS,
WITH THE LATEST NBM FORECAST NOW SEEING DELAYED AS WELL AS REDUCED
CHANCES FOR PRECIPITATION ACROSS THE WA CASCADES LATE WEEK INTO
THE WEEKEND, WITH PRECIPITATION CHANCES REACHING 30% BY SATURDAY
AND 50% BY SUNDAY.
WITH SNOW LEVELS AROUND 2000FT AND INCREASING TO AROUND 3000FT AND
HIGHER SATURDAY INTO SUNDAY, LOW (5-8:1) SLR, LEAD TO MINOR
MIDDLE ELEVATION SNOWS (UNDER 3 INCHES) FRIDAY NIGHT THOUGH SUNDAY
MORNING.
FOR WEEK 2, THE OUTLOOK IS FOR A 33-50% CHANCE FOR
WARMER THAN NORMAL CONDITIONS AND ABOUT A 33-40% CHANCE FOR ABOVE
NORMAL PRECIPITATION (JAN 24TH THROUGH JANUARY 28TH).
PRELIMINARY POINT TEMPS/POPS
PDT 36 22 36 21 / 0 0 0 0
ALW 36 25 36 24 / 0 0 0 0
PSC 38 25 38 25 / 0 0 0 0
YKM 39 22 39 21 / 0 0 0 0
HRI 37 24 36 23 / 0 0 0 0
ELN 36 22 36 20 / 0 0 0 0
RDM 43 20 48 19 / 0 0 0 0
LGD 48 24 43 23 / 0 0 0 0
GCD 53 27 50 27 / 0 0 0 0
DLS 41 26 40 26 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...AIR STAGNATION ADVISORY UNTIL 4 PM PST TUESDAY FOR ORZ041-044-
507-508-510-511.
WA...AIR STAGNATION ADVISORY UNTIL 4 PM PST TUESDAY FOR WAZ024-
026>029-521.
DISCUSSION...71
AVIATION...74
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