722
FXUS66 KPDT 230522
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
922 PM PST THU JAN 22 2026
UPDATED AVIATION DISCUSSION
AVIATION...06Z TAFS
MVFR OR LOWER CONDITIONS TO PREVAIL
THROUGH THE PERIOD. SITE DLS IS CURRENTLY THE CLOSEST TO RISING
INTO VFR CONDITIONS, HOWEVER THE EXPECTATION IS THAT AS A WEATHER
SYSTEM OVERHEAD EXITS THE REGION, CIGS WILL STAY AT OR JUST BELOW
3KFT AGL THROUGH THE PERIOD. AT SITES PDT/YKM/ALW/PSC, CIGS WILL
REMAIN BETWEEN 1.5KFT TO 2.5KFT THROUGH THE PERIOD. HOWEVER, VSBY
AT SITE PDT WILL STAY BETWEEN 4SM-6SM. AT SITES RDM/BDN, REGIONAL
CAMERAS SHOW LIGHT SNOW FLURRIES, WHICH ARE EXPECTED TO LAST
THROUGH 08Z. OTHERWISE, CIGS WILL BE 400FT OR LOWER THROUGH 19Z,
THEN RISING TO BETWEEN 500FT TO 1KFT. VSBY IS EXPECTED TO TREND
DOWN AT THESE SITES OVERNIGHT, THEN INCREASING AGAIN BY TOMORROW
AFTERNOON. WINDS WILL BE LIGHT THROUGH THE PERIOD. LAWHORN/82
PREV DISCUSSION
/ISSUED 249 PM PST THU JAN 22 2026/
DISCUSSION
AN AREA OF SURFACE HIGH PRESSURE REMAINS OVER EASTERN WASHINGTON
INTO CENTRAL OREGON TONIGHT AS VISIBLE SATELLITE IMAGERY CONTINUES
TO SHOW WIDESPREAD STRATUS ACROSS ALL AREAS EXPECT FOR THE HIGHER
ELEVATIONS OF THE EASTERN MOUNTAINS. A SUBTLE 500 MB POS
VORTICITY MOVES NORTHWEST TO SOUTHEAST ACROSS THE AREA AFTER
MIDNIGHT AND THROUGH ABOUT 00Z FRIDAY, OFFERING A SLIGHT
(LOCALIZED 20% CHANCES) ADJUSTMENT TO OUR POSSIBLE SENSIBLE
WEATHER. NBM IS MODELING SOME VERY LIGHT SNOW ACCUMS (TRACE –
0.1”) ACROSS WA694 ZONE, AS WELL AS ACROSS THE OREGON CASCADES.
AS THIS SYSTEM IS WEAK, THE SURFACE PATTERN/COLD POOL IS NOT
ANTICIPATED TO CHANGE. GIVEN THIS PATTERN OF PERSISTENCE IS
EXPECTED FOR ANOTHER COUPLE OF DAYS WE EXTRAPOLATED OUT
PROBABILITIES FOR FREEZING FOG FOR TONIGHT. STRATUS IS LIKELY TO
REMAIN IN PLACE UNTIL THE WEEKEND WHEN THE NEXT APPROACHING SYSTEM
CAN DISRUPT THE WEAK PRESSURE GRADIENT WE NOW HAVE AND ALLOW THE
BOUNDARY LAYER WINDS TO DEVELOP. AFTERNOON HIGH TEMPERATURES
CONTINUE TO REMAIN WELL BELOW THE NBM VALUES, IN THE AREAS UNDER
STRATUS AND AREA CLOSER TO NBM 10TH OR EVEN 5TH PERCENTILE VALUES.
CURRENT FORECAST CONTINUES TO REFLECT A BLEND OF PERSISTENCE AND
THE 25TH PERCENTILE NBM THROUGH SATURDAY AFTERNOON.
AIR QUALITY ADVISORY WAS REPOSTED/EXTENDED THOUGH MONDAY MORNING
FOR SOUTHERN DESCHUTES COUNTY. ENSEMBLE 850 MB WINDS SUGGESTS A
DOMINANT WESTERLY COMPONENT AND STRONGER WINDS SPEEDS IN EXCESS OF
15KTS OVER A MORE BROAD AREA FROM THE COLUMBIA RIVER GORGE
THROUGH ALL OF SE WA BY MONDAY, WHICH COULD BE ABLE TO MIX OUT
SOME OF THE AREAS THAT HAVE BEEN SEEING LOW STRATUS AND FOG FOR
SEVERAL DAYS IN A ROW. NBM WARMS TEMPERATURES INTO THE UPPER 30S
ACROSS RIDGES TO THE 40S IN THE LOWER ELEVATIONS AND BASINS.
PRELIMINARY POINT TEMPS/POPS
PDT 22 33 19 35 / 0 0 0 0
ALW 24 32 22 34 / 0 0 0 0
PSC 25 38 20 36 / 0 0 0 0
YKM 23 35 19 33 / 0 0 0 0
HRI 24 34 19 34 / 0 0 0 0
ELN 20 34 17 32 / 0 0 0 0
RDM 19 33 13 37 / 0 10 0 0
LGD 21 35 16 35 / 0 0 0 0
GCD 20 36 16 36 / 10 0 0 0
DLS 27 37 23 38 / 20 10 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
DISCUSSION...71
AVIATION...82
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