800
FXUS66 KPDT 191057
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
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 33040% CHANCE DOE ABOVE
NORMAL PRECIPITATION (JAN 24TH THROUGH JANUARY 28TH).
PREV DISCUSSION
/ISSUED 906 PM PST SUN JAN 18 2026/
AVIATION...06Z TAFS...CONDITIONS CONTINUE TO RANGE FROM MVFR TO
LIFR ACROSS THE REGION. AS THE HIGH PRESSURE LINGERS OVERHEAD AND
WINDS REMAIN LIGHT, THERE ARE NO CHANCES OF MIXING WHICH IS WHAT
IS KEEPING THE STRATUS AND FOG. EXPECT ALL SITES TO REMAIN MVFR
OR WORSE THROUGH THE FORECAST PERIOD. HOWEVER, MODELS ARE
SUGGESTING SLIGHT CLEAR OUT TOMORROW AFTERNOON, BUT SHOWS THE
CLOUD DECKS TO REFORM AGAIN OVERNIGHT.
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...99
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