867
FXUS66 KPDT 251740
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1040 AM PDT SAT APR 25 2026
. UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- FREEZE WARNINGS IN PLACE THROUGH 8 AM
- LIGHT MOUNTAIN SHOWERS SUNDAY AND MONDAY
- WARMING AND DRY THROUGH THE WEEK
DISCUSSION
THE HRRR MODEL 850 MB LEVEL WINDS INCREASE TO ABOUT 10 KNOTS IN
PARTS OF THE COLUMBIA BASIN; REMAINING LIGHT AND VARIABLE
AROUND THE TRI CITIES, LIMITING MIXING POTENTIAL OVERNIGHT. AS
OF 1:30 AM, A BROAD AREA FORM THE SNAKE RIVER/COLUMBIA RIVER
CONFLUENCE, TO THE FOOTHILLS OF THE BLUE MOUNTAINS HAVE
REGISTERED 34 DEGREES OR COLDER ON MESONET SITES WITH LOCALLY
FREEZING TEMPERATURES. WARMEST AREAS TODAY WILL BE FOUND IN THE
LOW 60S INCLUDING THE YAKIMA VALLEY, LOWER COLUMBIA BASIN AND
THE EASTERN COLUMBIA RIVER GORGE. MOST OTHER HIGHLAND AREAS WILL
SEE THE MID TO UPPER 50S. TEMPERATURES ARE MODELED A COUPLE OF
DEGREES WARMER FOR SUNDAY MORNING BY THE HREF AND NBM MEAN, IN
THE MID 30S WITH LIGHT WIND. THE PROBABILITY FOR SUB FREEZING
TEMPERATURES ARE ONLY IN THE 10% AREA FOR THE SIMILAR AREAS AND
CONFIDENCE FOR ANOTHER FREEZING WARNING IS FAR LESS THAN 50% AS
MODELS INDICATE MARGINALLY MORE CLOUD COVER. SUNDAY NIGHT AND
MONDAY WILL BRING LIMITED SHOWERS AND NO WETTING RAINS, FOCUSED
ON MOUNTAIN ZONES AT 15-30% COVERAGE. SNOW LEVELS AROUND
4200-4600 FT AGL WILL DROP TO AROUND 3800-4000 FT AGL NEAR
SNOQUALMIE PASS AND THE EASTERN MOUNTAINS SUNDAY NIGHT/MONDAY
MORNING. CHANCES BECOME MORE NOTICEABLE ON MONDAY AFTERNOON
(20-30% CHANCES) ACROSS THE CASCADES AND EASTERN MOUNTAINS,
(40-65% CHANCES). FROM TUESDAY ONWARD, LOOK FOR DRY AND
PROGRESSIVELY WARMER HIGHS EACH DAY INTO SATURDAY.
AVIATION /18Z TAFS THROUGH 18Z SUNDAY/
VFR CONDITIONS CURRENTLY AT ALL SITES, WHICH WILL STAY THE COURSE
THROUGH THE PERIOD. WINDS WILL STAY LIGHT AND BELOW 10 KTS, WITH
BROKEN CEILINGS OF 25KFT THIS EVENING. 75
PRELIMINARY POINT TEMPS/POPS
PDT 58 33 62 39 / 0 0 0 10
ALW 60 38 62 42 / 0 0 10 10
PSC 64 36 67 40 / 0 0 0 10
YKM 63 37 67 38 / 0 0 10 10
HRI 63 34 66 40 / 0 0 0 0
ELN 58 33 62 36 / 0 0 10 10
RDM 58 26 59 29 / 0 0 0 0
LGD 55 30 57 33 / 10 0 10 10
GCD 55 28 56 32 / 0 0 10 10
DLS 66 40 69 43 / 0 0 10 10
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...75
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