879
FXUS66 KPDT 250908
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
208 AM PDT SAT APR 25 2026
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 /06Z TAFS THROUGH 06Z SUNDAY/
VFR CONDITIONS AND WINDS, MAINLY 10 KTS OR LESS ARE EXPECTED
THROUGH SATURDAY.
PRELIMINARY POINT TEMPS/POPS
PDT 58 34 61 38 / 0 0 0 10
ALW 59 38 62 41 / 10 0 10 10
PSC 64 36 67 40 / 0 0 0 10
YKM 63 36 66 38 / 0 0 0 10
HRI 63 34 65 39 / 0 0 0 0
ELN 58 33 61 36 / 0 0 10 10
RDM 58 26 58 30 / 0 0 0 0
LGD 56 30 56 32 / 10 10 20 10
GCD 55 29 56 31 / 10 0 10 10
DLS 66 39 68 43 / 0 0 10 10
PDT WATCHES/WARNINGS/ADVISORIES
WA...FREEZE WARNING UNTIL 8 AM PDT THIS MORNING FOR WAZ026-028-029.
OR...FREEZE WARNING UNTIL 8 AM PDT THIS MORNING FOR ORZ044-507.
DISCUSSION...71
AVIATION...77
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