182
FXUS66 KPDT 240529
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
929 PM PST FRI JAN 23 2026
AVIATION
DRIER AIR IS ERODING SOME OF THE STRATUS FORM NORTH TO SOUTH
ACROSS SECTIONS OF THE COLUMBIA BASIN OF WA, WHICH SHOULD LESSEN
IMPACTS TO SOME OF THE TERMINALS HEADING INTO SATURDAY. FOCUS
AREAS FOR CONTINUES RISK OF LOW CEILINGS OR VISIBILITY CONTINUES
TO BE BDN AND RDM WHERE CEILINGS CAN LOWER INTO THE IFR CATEGORY
OVERNIGHT. AS STRATUS BEGINS TO ERODE OVERNIGHT, RADIATION FOG
DEVELOPMENT IS POSSIBLE, IMPACTING VISIBILITY BY AROUND 10-12Z.
PSC IS ALREADY IN THE DRIER AIR AND SHOULD REMAIN VFR. THERE IS
ABOUT A 20 PERCENT CHANCE FOR QUARTER MILE VISIBILITY TO DEVELOP
AT PDT AND ALW.
PREV DISCUSSION
/ISSUED 229 PM PST FRI JAN 23 2026/
DISCUSSION...
HIGH PRESSURE REMAINS OVER THE REGION. A WEAK SHORTWAVE WAS MOVING
ACROSS THE PACIFIC NORTHWEST. HOWEVER, THIS FEATURE IS NOT STRONG
ENOUGH TO DISPLACE THE STUBBORN LOW CLOUDS. THE RIDGE WILL
GRADUALLY BUILD BACK IN OVER THE WEEKEND, SO EXPECT MORE OF THE
SAME. VERY LIGHT FREEZING FOG/SNOW FREEZING DRIZZLE CONTINUES IN
SPOTS WHICH CAN MAKE ROADS, SIDEWALKS AND OTHER AREAS SLICK. FOR
NOW, HAVE ISSUED A WINTER WEATHER ADVISORY FOR CENTRAL OREGON, BUT
WILL HAVE TO MONITOR OTHER LOCATIONS AS WELL.
BY MONDAY, THE FLOW WILL TURN MORE WESTERLY AS A WEAK TROUGH MOVES
ONSHORE MONDAY NIGHT. WHILE THIS FEATURE IS STRONGER THAN TODAY'S
SYSTEM, IT IS STILL PROBABLY NOT ENOUGH TO CLEAR OUT MOST OF THE
STRATUS. THE HIGH WILL QUICKLY BUILD BACK IN BEHIND THIS SYSTEM.
ANOTHER POTENTIALLY STRONGER SYSTEM WILL APPROACH AROUND THE
MIDWEEK PERIOD AND BRING SOME LOW PRECIPITATION CHANCES (20-30
PERCENT), MAINLY TO THE MOUNTAINS. THIS IS PERHAPS THE BEST
CHANCE OF FINALLY CLEARING OUT SOME OF THESE STUBBORN CLOUDS, BUT
IT IS TOO SOON TO TELL IF THIS SYSTEM WILL BE ABLE TO ACCOMPLISH
THAT TASK, AS THERE ARE DIFFERENCES IN THE GUIDANCE THAT FAR OUT.
HOWEVER, ANY CLEARING COULD BE SHORT-LIVED AS THE RIDGE BUILDS
BACK IN TOWARD THE END OF NEXT WEEK.
AS LONG AS THE STRATUS REMAINS AROUND, TEMPERATURES WILL CONTINUE
TO BE BELOW NORMAL, IN SOME CASES 10 TO 15 DEGREES OR SO.
GUIDANCE DOES SUGGEST A RETURN TO MORE NORMAL TEMPERATURES NEXT
WEEK, IF WE ARE ABLE TO SCOUR OUT SOME OF THESE CLOUDS.
AVIATION...
00Z TAFS...CONDITIONS RANGE FROM VFR TO LIFR AND NOT MUCH CHANGE
IS EXPECTED. THERE COULD BE SOME AFTERNOON IMPROVEMENTS AND
EVENING/NIGHT DECREASES.
PRELIMINARY POINT TEMPS/POPS
PDT 28 22 28 23 / 10 10 10 0
ALW 30 23 30 23 / 10 10 10 0
PSC 34 25 33 25 / 0 0 0 0
YKM 31 26 30 25 / 0 0 0 0
HRI 32 25 32 25 / 10 10 10 0
ELN 28 23 27 23 / 0 0 0 0
RDM 27 20 29 20 / 10 10 10 0
LGD 30 23 30 23 / 0 0 0 0
GCD 27 20 28 21 / 0 0 0 0
DLS 34 26 34 27 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
SHORT TERM...99
LONG TERM....99
AVIATION...71
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