292
FXUS66 KPDT 191746
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
946 AM PST MON JAN 19 2026
.UPDATED AVIATION.
AVIATION...18Z TAFS
LOW STRATUS CONTINUES TO TAKE OVER TAF
SITES, WITH CIGS AS HIGH AS 2000 FEET (DLS/YKM/ALW/PSC) AND AS LOW
AS AROUND 200-400 FEET (RDM/BDN). FOG/VISIBILITY CONCERNS ARE
MOSTLY LIMITED TO THE CENTRAL OREGON TERMINALS (RDM/BDN) BUT WILL
IMPROVE GOING INTO THE AFTERNOON HOURS. EXPECTING CIGS IN MOST
SITES TO LIFT AS WE GO INTO THE LATE EVENING HOURS BUT WE'LL SEE
THEM MAJORLY IN IFR TO LIFR FOR THE MAJORITY OF THE PERIOD. WINDS
ARE MOSTLY LIGHT AT LESS THAN 4 KNOTS WITH CALM CONDITIONS AT
TIMES.
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 22 36 21 36 / 0 0 0 0
ALW 25 36 24 35 / 0 0 0 0
PSC 25 38 25 38 / 0 0 0 0
YKM 22 39 21 37 / 0 0 0 0
HRI 24 36 23 36 / 0 0 0 0
ELN 22 36 20 35 / 0 0 0 0
RDM 20 48 19 45 / 0 0 0 0
LGD 24 43 23 43 / 0 0 0 0
GCD 27 50 27 49 / 0 0 0 0
DLS 26 40 26 39 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...AIR STAGNATION ADVISORY UNTIL 4 PM PST TUESDAY FOR ORZ041-044-
507-508-510-511.
FREEZING FOG ADVISORY UNTIL NOON PST TODAY FOR ORZ508-510.
WA...AIR STAGNATION ADVISORY UNTIL 4 PM PST TUESDAY FOR WAZ024-
026>029-521.
SHORT TERM...71
LONG TERM....71
AVIATION...95
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