150
FXUS66 KPDT 061804
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1004 AM PST TUE JAN 6 2026
UPDATED AVIATION DISCUSSION
AVIATION...18Z TAFS
VFR CONDITIONS WILL PREVAIL THROUGHOUT THE
DAY FOR MOST SITES. HOWEVER, KDLS MAY BECOME MVFR AS LOW CLOUDS
ARRIVE THIS EVENING WITH THIS FRONTAL SYSTEM. RAIN SHOWERS WILL
DEVELOP FOR KDLS/KRDM/KBDN/KYKM/KALW BETWEEN 23Z AND 05Z, THOUGH
KRDM/KBDN MAY GET LIGHT SNOW LATER THIS EVENING (30-40% CONFIDENCE).
ADDITIONALLY, THIS FRONTAL SYSTEM WILL ALSO BRING BREEZY TO WINDY
CONDITIONS ACROSS ALL SITES LATER THIS MORNING FOR KYKM AND
AFTERNOON INTO EVENING HOURS FOR OTHERS. EXPECT THE SOUTHWESTERLY
WIND ALOFT TO ASSIST IN DEVELOPING LLWS WITH WINDS UP TO 45KTS AT 2
KFT FOR KPDT/KBDN/KALW/KPSC BETWEEN 23Z AND 02Z. GUSTS WILL BE AT
20-30KTS BUT COULD EXCEED TO 35KTS OR HIGHER AS THIS SYSTEM
PASSES (30-50% CONFIDENCE). FEASTER/97
PREV DISCUSSION
/ISSUED 340 AM PST TUE JAN 6 2026/
DISCUSSION
DRY CONDITIONS WITH HIGH CLOUD DECKS WILL CONTINUE
THROUGH THE NIGHT. WINDS ARE SLIGHTLY BREEZIER COMPARED TO LAST
NIGHT, WHICH IS PREVENTING MUCH OF THE FOG THAT DEVELOPED
YESTERDAY FROM OCCURRING AGAIN TONIGHT. WEATHER WILL CONTINUE TO
BE BENIGN GOING THROUGH THE EARLY MORNING HOURS UNTIL AN INCOMING
SHORTWAVE BEGINS THE ANTICIPATED WINTER STORM ASSOCIATED WITH THE
WINTER STORMS WARNING ACROSS THE MOUNTAIN REGIONS THAT IS EXPECTED
TO LAST THROUGH THURSDAY EVENING. MODERATE TO HEAVY MOUNTAIN SNOW
WILL BRING SEVERAL FEET OF SNOW ACROSS PORTIONS OF THE CASCADE
CRESTS AND PARTS OF THE NORTHERN BLUE MOUNTAINS. AN APPROACHING
COLD FRONT WILL PUSH THROUGH THE AREA BETWEEN THE MID TO LATE
MORNING HOURS OF WEDNESDAY THAT WILL JOLT SNOW RATES UP TO 1 TO 4
INCHES PER HOUR ACROSS PORTIONS OF THE MOUNTAIN REGIONS (75 TO 85
PERCENT CHANCE).
THE COLD FRONT WILL ALSO BRING THURSDAYS LOW TEMPERATURES BELOW
FREEZING THROUGH THE VAST MAJORITY OF THE REGION ALONG WITH
MODERATE WIND GRADIENTS. ALTHOUGH NOT STRONG ENOUGH TO WARRANT
WIND ADVISORIES, BREEZY TO LOCALLY WINDY CONDITIONS WILL DEVELOP
WEDNESDAY INTO THURSDAY MORNING, WITH GUSTS UP TO 30 TO 40 MPH (60
TO 80 PERCENT CHANCE). STRONG WIND CONDITIONS WILL BE COMBINED
WITH THE MODERATE TO HEAVY SNOW STORM ACROSS THE MOUNTAIN REGIONS,
CAUSING LOW VISIBILITY AND HARSH WINTER DRIVING CONDITIONS
(ESPECIALLY ALONG THE PASSES GOING THROUGH THE CASCADES AND
NORTHERN BLUE MOUNTAINS).
SNOW AMOUNTS WILL BE VERY EXCESSIVE, WITH EVEN THE LOW END AMOUNT
WITH A 90 PERCENT CHANCE OF 21 INCHES OR MORE IN SNOQUALMIE PASS
THROUGH THURSDAY EVENING, 16 INCHES OR MORE IN SANTIAM PASS, AND 5
INCHES IN TOLLGATE. ON THE HIGH END SIDE, WITH A 10 PERCENT CHANCE
OF SNOQUALMIE PASS GETTING 49 INCHES OR MORE THROUGH THURSDAY
EVENING, 53 INCHES IN SANTIAM PASS, AND 28 INCHES IN TOLLGATE.
CURRENTLY, OUR FORECAST CALLS FOR BETWEEN 12 AND 30 INCHES IN
THE NORTHERN BLUE MOUNTAINS, BETWEEN 16 AND 35 INCHES FOR THE
EAST SLOPES OF THE OREGON CASCADES/UPPER SLOPES OF THE EASTERN
WASHINGTON CASCADES CREST, AND 7 TO 12 INCHES FOR THE LOWER SLOPES
OF THE EASTERN WASHINGTON CASCADES CREST. WITH THE WIND THREAT
MENTIONED EARLIER, WINDS WILL BE GUSTING AS HIGH AS 45 MPH.
ADDITIONAL IMPACTS IN CENTRAL OREGON (THAT INCLUDES BEND AND
REDMOND) IS POSSIBLE WITH THE COLD FRONT ON WEDNESDAY BRINGING UP
TO AN INCH OF SNOW THROUGHOUT THE AREA, ALTHOUGH CONFIDENCE IS LOW
CURRENTLY (10 TO 20 PERCENT) THAT AMOUNTS WILL SURPASS ADVISORY
LEVELS AT THIS TIME, BUT DRIVERS ON HIGHWAY 97 SHOULD PREPARE FOR
WINTER WEATHER CONDITIONS ON THE ROAD AS WE HEAD THROUGH THE MID
WEEK.
PRELIMINARY POINT TEMPS/POPS
PDT 48 34 47 30 / 50 60 20 50
ALW 47 35 46 32 / 80 80 30 60
PSC 48 35 48 31 / 40 30 10 20
YKM 44 28 44 26 / 40 50 30 10
HRI 48 34 48 32 / 30 40 10 30
ELN 38 26 38 24 / 60 60 50 30
RDM 46 27 42 24 / 10 60 50 50
LGD 44 32 40 27 / 80 90 40 70
GCD 45 32 40 26 / 60 80 40 60
DLS 45 35 45 34 / 60 90 70 70
PDT WATCHES/WARNINGS/ADVISORIES
OR...WINTER STORM WARNING UNTIL 4 PM PST THURSDAY FOR ORZ502-509.
WA...WINTER STORM WARNING UNTIL 4 PM PST THURSDAY FOR WAZ030-522-523.
DISCUSSION...95
AVIATION...97
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