843
FXUS66 KPDT 162142
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
142 PM PST FRI JAN 16 2026
DISCUSSION
ONGOING HIGH PRESSURE ACROSS THE REGION HAS ALLOWED A
LOW STRATUS / FOG DECK TO SPREAD THROUGHOUT THE COLUMBIA BASIN AND
DOWN INTO CENTRAL OREGON. SO WHILE OUR MOUNTAIN ZONES AND EASTERN
VALLEYS (GRANDE RONDE, WALLOWA, AND JOHN DAY) SEE CLEAR SKIES, THE
REST OF THE FORECAST AREA IS EXPECTED TO SEE OVERCAST AND COLD
CONDITIONS THROUGH AT LEAST EARLY NEXT WEEK. THE LONGER THIS LAYER
PERSISTS, THE MORE LIKELY FOG WILL LIFT INTO A LOW STRATUS ACROSS
SOME AREAS, BUT MORE ELEVATED VALLEYS LIKE CENTRAL/NORTH CENTRAL
OREGON AND THE KITTITAS VALLEY MAY NOT BE SO LUCKY.
OPTED TO EXTEND THE ONGOING FREEZING FOG ADVISORIES FOR THE
YAKIMA/KITTITAS VALLEYS AND NORTH CENTRAL OREGON THROUGH THE NEXT 24
HOURS. CONFIDENCE WASN'T HIGH ENOUGH THAT THE FOG LAYER FOR LIFT
LONG ENOUGH TO ALLOW THE ADVISORY TO EXPIRE, SO FOR MESSAGING
PURPOSES, OPTED FOR SOMETHING LONGER FUSED. ELSEWHERE, PARTICULARLY
THE LOWER COLUMBIA BASIN, THIS LOW CLOUD DECK HAS PERSISTED LONG
ENOUGH THAT FOG REDEVELOPMENT IS DECREASING WITH EACH SUCCESSIVE
DAY, BUT DID OPT TO MENTION PATCHY FOG FOR THE AREA CURRENTLY
OUTLINED BY LOW CLOUDS AS SEEN ON LATEST VISIBLE SATELLITE IMAGERY.
OTHERWISE, AIR STAGNATION ADVISORIES REMAIN IN EFFECT THROUGH
TUESDAY FOR THE BASIN DOWN THROUGH CENTRAL OREGON DUE TO THIS
ONGOING HIGH PRESSURE PATTERN. MODELS KEEP THIS PATTERN MORE OR LESS
IN PLACE UNTIL AROUND SUNDAY, WHEN THE SYNOPTIC FLOW REGIME BECOMES
MORE LIGHTLY NORTHWESTERN. NOT ANTICIPATING ANY SIGNIFICANT CHANGES
TO THE WEATHER UNTIL AROUND MIDWEEK NEXT WEEK WHEN ENSEMBLES START
TO HINT AT SHORTWAVE TROUGHING ENVELOPING THE REGION, HOWEVER
DETAILS REMAIN SCANT THIS FAR OUT. 74
AVIATION...00Z TAFS
CONDITIONS CONTINUE TO RANGE FROM MVFR TO LIFR.
THERE IS A POSSIBILITY THAT THERE WILL BE SOME BRIEF IMPROVEMENT
TO VFR AT A FEW SITES, BEFORE MORE SITES DETERIORATE THIS EVENING
AND OVERNIGHT. WINDS WILL REMAIN LIGHT THROUGH THE PERIOD.
PRELIMINARY POINT TEMPS/POPS
PDT 26 37 24 36 / 0 0 0 0
ALW 28 38 27 36 / 0 0 0 0
PSC 28 39 26 39 / 0 0 0 0
YKM 26 41 25 41 / 0 0 0 0
HRI 28 39 25 37 / 0 0 0 0
ELN 24 37 24 38 / 0 0 0 0
RDM 20 46 20 44 / 0 0 0 0
LGD 26 46 27 47 / 0 0 0 0
GCD 29 52 30 52 / 0 0 0 0
DLS 31 41 29 41 / 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 SATURDAY FOR ORZ510.
WA...AIR STAGNATION ADVISORY UNTIL 4 PM PST TUESDAY FOR WAZ024-
026>029-521.
FREEZING FOG ADVISORY UNTIL NOON PST SATURDAY FOR WAZ026-027.
DISCUSSION...74
AVIATION...77
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