469
FXUS66 KPDT 160537
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
937 PM PST THU JAN 15 2026
.UPDATED AVIATION DISCUSSION.
AVIATION...06Z TAFS
VARIABLE CONDITIONS ACROSS ALL SITES, WITH
VFR AT KRDM/KBDN, MVFR AT KDLS, IFR AT KPSC, AND LIFR AT
KPDT/KYKM/KALW DUE TO REDUCED VISIBILITIES OF 1/4SM AND CEILINGS OF
200 FEET. THESE CONDITIONS WILL PERSIST OVERNIGHT AND THROUGH THE
MORNING HOURS ON FRIDAY, WITH KPSC EXPECTED TO DROP INTO LIFR
CONDITIONS SHORTLY WITH REDUCED VISIBILITIES OF 1/2SM. FOG SHOULD
DISSIPATE FRIDAY AFTERNOON, BUT CEILINGS WILL STAY LOW AND IN EITHER
IFR OR LIFR FOR ALL SITES. 75
PREV DISCUSSION
/ISSUED 841 PM PST THU JAN 15 2026/
UPDATE...CURRENT INFRARED SATELLITE IMAGERY SHOWS STRATUS AND FOG
EXTENDING ACROSS THE NORTHERN BLUE MOUNTAIN FOOTHILLS, NORTH-
CENTRAL OREGON, AND THE YAKIMA/KITTITAS VALLEYS AS VISIBILITIES OF
ONE QUARTER OF A MILE OR LESS ARE BEING OBSERVED AT WEATHER
STATIONS AND VIEWED BY LOCAL WEBCAMS. THESE CONDITIONS ARE
EXPECTED TO CONTINUE OVERNIGHT AND THROUGH THE MORNING ON FRIDAY.
AS A RESULT, DENSE FOG ADVISORIES HAVE BEEN ISSUED THROUGH NOON
ON FRIDAY, WITH A FREEZING FOG ADVISORY ACROSS NORTH-CENTRAL
OREGON. TEMPERATURES ARE SLOWLY COOLING, SO SOME OF THESE
ADVISORIES MAY NEED TO TRANSITION FROM DENSE FOG TO FREEZING FOG
AT SOME POINT. THE NBM ADVERTISES A 50-60% CHANCE OF VISIBILITIES
BELOW 3 MILES AND A 40-50% CHANCE OF VISIBILITIES DIPPING BELOW 1
MILE DURING THE ADVISORY TIMEFRAME. NBM GUIDANCE CURRENTLY
SUGGESTS A 30-40% CHANCE OF VISIBILITIES OF LESS THAN 1 MILE AT
THE 8 PM HOUR OVER AREAS EXPERIENCING ONE HALF TO ONE QUARTER OF A
MILE VISIBILITIES. THUS, CALIBRATING THE GUIDANCE TO CURRENT
OBSERVATIONS PROVIDES HIGH CONFIDENCE (70-80%) OF THESE CONDITIONS
PERSISTING THROUGH FRIDAY MORNING OVER THE AFOREMENTIONED AREAS.
DISCUSSION...SATELLITE SHOWS STRATUS CONTINUING TO COVER MUCH OF
THE COLUMBIA BASIN AND INTO THE YAKIMA/KITTITAS REGION THROUGH THE
AFTERNOON HOURS. REGION IS STILL DOMINATED BY HIGH PRESSURE AND A
RIDGE JUST WEST OF THE AREA, BRINGING COOL POOLING AND SUBSIDENCE.
DESPITE SOME NORTHWARD COOL/DRY AIR, IT DOESN'T HELP MIX THE SURFACE
ENOUGH TO MAKE THE STRATUS DISSIPATE. THE PATTERN IS LOOKING TO
CONTINUE AT LEAST OVER THE NEXT COUPLE OF DAYS OF LOW STRATUS/FOG IN
THE LOWER REGIONS. THE DOMINANT RIDGE LOOKS TO STAY THROUGH AT LEAST
EARLY NEXT WEEK, WHICH WILL ALSO BRING SOME AIR STAGNATION CONCERNS
ALONG THE LOWER AREAS OF THE REGION THROUGH AT LEAST TUESDAY
AFTERNOON. RIDGE WILL BEGIN TO ERODE SUNDAY TO MONDAY, BEFORE
BRINGING A MORE MIXED ENVIRONMENT GOING INTO TUESDAY EVENING.
OTHERWISE, WE'LL CONTINUE TO SEE AREAS OF WIDESPREAD FOG/FREEZING
FOG, ESPECIALLY THROUGH THE MORNING HOURS TO AFTERNOON DEVELOP,
MAKING ROADS HARDER TO NAVIGATE IN GENERAL AND POSSIBLY MORE SLICK
DUE TO THE FREEZING TEMPS. WINDS REMAIN LIGHT AND VARIABLE FOR THE
MOST PART THROUGH THE NEXT SEVERAL DAYS. THE PATTERN MAY BEGIN TO
SHIFT THROUGH MID-NEXT WEEK AS THE RIDGE DE-AMPLIFYS (60-80 PERCENT
CHANCE) AND MOUNTAIN RAIN/SNOW SHOWERS START TO COME BACK INTO THE
PICTURE, BUT WILL NEED TO INCH CLOSER TO THE EVENT BEFORE WE HAVE A
BETTER PICTURE OF THE OVERALL SET-UP.
PRELIMINARY POINT TEMPS/POPS
PDT 27 38 24 38 / 0 0 0 0
ALW 30 38 27 38 / 0 0 0 0
PSC 28 40 27 39 / 0 0 0 0
YKM 28 43 26 42 / 0 0 0 0
HRI 27 40 26 38 / 0 0 0 0
ELN 27 40 25 39 / 0 0 0 0
RDM 21 40 19 46 / 0 0 0 0
LGD 28 46 27 47 / 0 0 0 0
GCD 29 51 29 53 / 0 0 0 0
DLS 32 43 30 42 / 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 FRIDAY FOR ORZ507-510.
WA...AIR STAGNATION ADVISORY UNTIL 4 PM PST TUESDAY FOR WAZ024-
026>029-521.
FREEZING FOG ADVISORY UNTIL NOON PST FRIDAY FOR WAZ026-027.
DENSE FOG ADVISORY UNTIL NOON PST FRIDAY FOR WAZ029.
UPDATE...75
DISCUSSION....95
AVIATION...75
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