736
FXUS66 KPDT 210542
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
942 PM PST TUE JAN 20 2026
UPDATED AVIATION DISCUSSION
AVIATION...12Z TAFS
MVFR OR LOWER CONDITIONS TO PREVAIL THROUGH
THE PERIOD. SITES DLS/YKM/PSC ARE EXPECTED TO REMAIN UNDER MVFR
CIGS WITH VFR VSBY THROUGH THE PERIOD. SITE ALW IS EXPECTED TO
REMAIN UNDER MVFR CIGS, THOUGH CIGS MAY LOWER TO AROUND 900FT
PERIODICALLY LATE TONIGHT AND THROUGH TOMORROW MORNING, WITH
PATCHY FOG BRINGING VSBY DOWN TO BETWEEN 3-5SM AFTER 14Z AS WELL.
SITE PDT WILL SEE CIGS WAVER BETWEEN 800FT AND 1100FT THROUGH THE
PERIOD, WITH HIGH CONFIDENCE OF CIGS DROPPING BELOW 1000FT TONIGHT
THROUGH TOMORROW MORNING. VSBY IS ALSO EXPECTED TO DROP TO BETWEEN
3-5SM BETWEEN 13Z AND 21Z. THE STRATUS AND FOG LAYERS ARE EXPECTED
TO PERSIST THROUGH THE PERIOD AT SITES RDM/BDN, WITH LOWEST
VSBY/CIGS EXPECTED THROUGH 19-20Z, THEN REDEVELOPING AGAIN AFTER
03Z. WINDS WILL REMAIN LIGHT THROUGH THE PERIOD. LAWHORN/82
PREV DISCUSSION
/ISSUED 240 PM PST TUE JAN 20 2026/
DISCUSSION
SATELLITE SHOWS THE STRATUS IS CONTINUING TO
DOMINATE THE REGION WITH LOW CEILINGS OF LESS THAN 1000 FEET. A
PASSING SHORTWAVE HAS NOT DONE MUCH OF CLEARING OUT THE STRATUS
DECK, SO AM CONFIDENT (70-90 PERCENT CHANCE) THAT THE STRATUS WILL
STAY THROUGH TODAY AND THROUGH TONIGHT. PERIODS OF FREEZING FOG
WILL OCCUR IN THE LOWER ELEVATIONS, ESPECIALLY IN SOME SHELTERED
VALLEYS. CURRENTLY HAVE A FREEZING FOG ADVISORY FOR NORTH CENTRAL
OREGON WITH STRATUS COMPLETELY OBSCURING PARTS OF US-97 AND US-197
THAT WILL LIKELY (60-80 PERCENT CHANCE) BE EXTENDING PAST IT'S 5
PM CUT OFF. THERE HAVE BEEN OBSERVATIONS OF VERY LIGHT FREEZING
DRIZZLE AND OTHER WINTRY PRECIPITATION ACROSS AREAS NEAR FOOTHILLS
WITH OROGRAPHIC LIFTING ALLOWING SOME PRECIPITATION PROCESS TO
OCCUR. ACCUMULATION IS NOT LOOKING TO BE SIGNIFICANT DURING THESE
PHASES AND IS DIFFICULT TO PINPOINT THESE EVENTS ON RADAR GIVEN
THE VERY LIGHT NATURE. OTHERWISE, PARTS OF CENTRAL OREGON IN THE
BEND SHIFTED WINDS FROM THE NW, WHICH WILL NOT HELP WITH THE FOG
IN THE AREA. CLOSER TO PENDLETON, ROADS NEAR CABBAGE HILL AND
DEADMAN PASS HAVE OBSERVED VISIBILITIES OF LESS THAN A QUARTER OF
A MILE.
POOR AIR QUALITY IN SOUTHERN DESCHUTES COUNTY HAS BEEN EXTENDED
THROUGH 10 AM THURSDAY DUE TO THE TEMPERATURE INVERSION TRAPPING
POLLUTANTS THAT INCLUDES THREE RIVERS AND LA PINE. OTHERWISE,
WEATHER REMAINS MOSTLY BENIGN WITH MOSTLY CALM TO LIGHT WINDS
ACROSS THE AREA. THE AIR STAGNATION ADVISORY WILL BE DISCONTINUED
AT 4 PM THIS AFTERNOON (TUESDAY) WITH MIXING HEIGHTS INCREASING
1500 TO 2500 FEET THROUGH THE WEEK. OUR NEXT CHANCES OF PRECIP
WILL BE EARLY NEXT WEEK WITH MOUNTAIN SNOW RETURNING WITH A
DUSTING TO AN INCH AS OF NOW.
PRELIMINARY POINT TEMPS/POPS
PDT 26 32 21 33 / 0 0 0 0
ALW 28 32 24 34 / 0 0 0 0
PSC 31 35 23 36 / 0 0 0 0
YKM 27 35 22 36 / 0 0 0 0
HRI 31 33 23 35 / 0 0 0 0
ELN 26 33 20 33 / 0 0 0 0
RDM 23 39 17 38 / 0 0 0 0
LGD 24 40 21 40 / 0 0 0 0
GCD 21 47 25 45 / 0 0 0 0
DLS 33 37 26 38 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...FREEZING FOG ADVISORY UNTIL 9 AM PST WEDNESDAY FOR ORZ050.
FREEZING FOG ADVISORY UNTIL NOON PST WEDNESDAY FOR ORZ510.
WA...NONE.
DISCUSSION...95
AVIATION...82
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