284
FXUS66 KPDT 192307
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
307 PM PST MON JAN 19 2026
DISCUSSION
CURRENT SATELLITE IMAGERY SHOWS A LOW STRATUS LAYER
ACROSS THE COLUMBIA BASIN AREA EXTENDING TO CENTRAL OR. WHILE
MAJORITY OF FREEZING FOG HAS LIFTED OVER NORTH-CENTRAL OR AND
FOOTHILLS-SOUTHERN BLUE MOUNTAIN OF OR, THE WEBCAMS ARE CURRENTLY
SHOWING ONGOING FREEZING/DENSE FOG ALONG US-97 BETWEEN COW CANYON
AND SHANIKO.
THE NORTHWESTERLY FLOW DOMINATES THE REGION WITH THE UPPER RIDGE
ALONG THE PACNW COAST THROUGH WORK WEEK. THANKS TO THE LOW STRATUS
LAYER AND TEMPERATURE INVERSIONS, THIS WILL HELP KEEP HIGH TEMPS IN
THE 30S AND 40S. THE BOUNDARY LAYER WILL REMAIN DRY FROM THE ONGOING
SUBSIDENCE, WHICH WILL ASSIST IN LOWERING DEWPOINTS AND TEMPS TO
NEAR OR BELOW FREEZING DURING OVERNIGHT HOURS. THAT SAID,
FREEZING/DENSE FOG COULD REDEVELOP DURING EARLY MORNING HOURS AND
NIGHT HOURS. UNCERTAINTY STILL REMAIN ON THE STRENGTH OF THE FOG AND
EXTENT, BUT WE WILL MONITOR THE FORECAST AREA AND MAKE ANY
ADJUSTMENTS IF NEED BE. HREF RAW ENSEMBLES SHOW A 15-30% PROBABILITY
FOR VISIBILITIES LESS THAN 1/2SM BUT 30-40% PROB DURING MORNING
HOURS FOR TONIGHT THROUGH EARLY TUESDAY MORNING, WHICH MIGHT IMPACT
DRIVING CONDITIONS.
WITH THE ONGOING INVERSIONS, STAGNANT AIR CONDITIONS WILL CONTINUE
FOR THE NEXT FEW DAYS WITH LOW LOW TRANSPORT WINDS (10 MPH OR LESS)
AND MIXING HEIGHTS AROUND 1.5 KFT OR LOWER. ANY POLLUTANTS, HAZE,
AND/OR SMOKE MAY STILL BE TRAPPED NEAR SURFACE LEVEL THUS RESULTING
POOR VENTILATION, KEEPING AIR STAGNATION ADVISORIES IN PLACE UNTIL
LATE TUESDAY AFTERNOON. FEASTER/97
AVIATION...00Z TAFS
LOW STRATUS WITH SEVERAL SITES <2000 FEET OF
CIG CONTINUE TO IMPACT SITES, WITH THE CENTRAL OR TERMINALS SEEING
INITIAL IFR CONDITIONS. IFR CONDITIONS ARE EXPECTED TO LAST MUCH OF
THE PERIOD AS THE SURFACE HIGH PRESSURES CONTINUE TO HOLD THE LOW
STRATUS IN-TACT FOR THE MAJORITY OF THE TAF PERIOD. GUIDANCE HINTING
THAT WE'LL GET A BREAK IN THE STRATUS IN THE LAST FEW HOURS OF THE
PERIOD, BUT WAS CAUTIOUS TO INCLUDE IT FOR A LONGER DURATION GIVEN
THAT GUIDANCE HAS NOT INITIAL CORRECTLY FOR SOME OF THE TERMINALS.
WE'LL SEE HOW GUIDANCE EVOLVES GOING INTO THE 06Z TAFS, BUT FOR NOW
SUB-VFR CONDITIONS WILL PREVAIL FOR THE NEXT FEW HOURS.
WINDS REMAIN LIGHT AND VARIABLE.
PRELIMINARY POINT TEMPS/POPS
PDT 22 35 21 34 / 0 0 0 0
ALW 25 34 23 34 / 0 0 0 0
PSC 24 38 22 36 / 0 0 0 0
YKM 22 39 20 37 / 0 0 0 0
HRI 23 35 22 35 / 0 0 0 0
ELN 21 35 20 35 / 0 0 0 0
RDM 20 45 18 41 / 0 0 0 0
LGD 24 43 22 43 / 0 0 0 0
GCD 25 49 26 49 / 0 0 0 0
DLS 26 39 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.
WA...AIR STAGNATION ADVISORY UNTIL 4 PM PST TUESDAY FOR WAZ024-
026>029-521.
SHORT TERM...97
LONG TERM....97
AVIATION...95
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