157
FXUS66 KPDT 180521
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
921 PM PST SAT JAN 17 2026
UPDATED AVIATION
PREV DISCUSSION
/ISSUED 222 PM PST SAT JAN 17 2026/
DISCUSSION...
KEY MESSAGES...
1. HIGH PRESSURE WILL REMAIN THROUGH MUCH OF NEXT WEEK.
2. AIR STAGNATION, FOG AND FREEZING FOG WILL CONTINUE AS A RESULT
OF THE HIGH PRESSURE.
3. BY THE MIDDLE OF NEXT WEEK, THE THE HIGH SHOULD BREAK DOWN AND
WE WILL SEE THE FIRST PRECIPITATION CHANCES IN AWHILE.
STRONG HIGH PRESSURE WILL REMAIN OVER THE WESTERN CONUS THROUGH
MUCH OF NEXT WEEK. THE HIGH WILL REPOSITION ITSELF OVER THE COURSE
OF THE WEEK, BUT ULTIMATELY THE IMPACTS ARE THE SAME...FOG/FREEZING
FOG AND STAGNANT AIR, WITH DRY CONDITIONS OTHERWISE. SOME AREAS
WILL SEE STRATUS RATHER THAN FOG, BUT UNTIL THE HIGH LOSES ITS
GRIP ON THE AREA, THERE WILL BE VERY LITTLE IN THE WAY OF CHANGE.
PATCHY DENSE FOG REMAINS AROUND, ESPECIALLY IN CENTRAL OREGON, SO
HAVE OPTED TO LEAVE THE FREEZING FOG ADVISORY IN EFFECT,
ESPECIALLY SINCE MORE IS EXPECTED OVERNIGHT.
BY MIDWEEK, THE HIGH SHOULD BEGIN TO BREAK DOWN A LITTLE WITH
FURTHER EROSION BY THURSDAY INTO FRIDAY. BY LATE WEEK, A TROUGH IS
EXPECTED TO BRING PRECIPITATION TO THE PACIFIC NORTHWEST WITH
SNOW IN THE MOUNTAINS AND A LOW (20-30 PERCENT) CHANCE OF
PRECIPITATION IN THE LOWER ELEVATIONS. ULTIMATELY, SHOULD BE ALL
RAIN IN THE LOWER ELEVATIONS, BUT IF ENOUGH COLD AIR REMAINS THERE
COULD BE SOME PRECIPITATION TYPE ISSUES AT THE ONSET BUT HIGH
TEMPERATURES ARE EXPECTED TO BE ABOVE FREEZING.
AVIATION...
00Z TAFS...LOW STRATUS AND AREAS OF FOG CONTINUE TO DOMINATE OVER
THE REGION WITH HIGH PRESSURE PREVENTING MIXING. THESE CONDITIONS
WILL PERSIST THROUGH THE OVERNIGHT HOURS BEFORE THERE IS RELIEF BY
LATE MORNING/EARLY AFTERNOON. RDM/BDN ARE BOTH SEEING LIFR
CONDITIONS DUE TO FZFG. DLS/YKM/ALW/PSC ARE ALL MVFR DUE TO LOW
CIGS OF 1500-2000 FT DECKS AND PDT IS IFR DUE TO CIGS BELOW 600
FT. THESE CONDITIONS WILL CONTINUE THROUGH THE FORECASTED PERIOD.
90
PRELIMINARY POINT TEMPS/POPS
PDT 25 34 23 36 / 0 0 0 0
ALW 29 34 25 36 / 0 0 0 0
PSC 27 36 25 38 / 0 0 0 0
YKM 27 38 23 39 / 0 0 0 0
HRI 26 35 24 37 / 0 0 0 0
ELN 26 37 22 36 / 0 0 0 0
RDM 23 42 18 44 / 0 0 0 0
LGD 31 47 25 48 / 0 0 0 0
GCD 32 52 27 53 / 0 0 0 0
DLS 30 40 27 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 SUNDAY FOR ORZ502-507-510-
511.
WA...AIR STAGNATION ADVISORY UNTIL 4 PM PST TUESDAY FOR WAZ024-
026>029-521.
SHORT TERM...77
LONG TERM....77
AVIATION...90
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