544
FXUS66 KPDT 231747
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1047 AM PDT THU APR 23 2026
KEY MESSAGES
1. LINGERING MOUNTAIN SHOWERS THURSDAY
2. DRIER AND COOLER TEMPERATURES BEGIN THURSDAY
3. POTENTIAL FREEZE SATURDAY MORNING
DISCUSSION
CURRENT RADAR SHOWS NO RETURNS ACROSS THE REGION THIS MORNING.
GROUND OBSERVATIONS FROM YESTERDAY SHOW PLENTY OF RAINFALL OCCURRED
ACROSS THE REGION WITH SOME OF THE HIGHEST AMOUNTS OCCURRING ALONG
THE FOOTHILLS. PENDLETON MEASURED 0.63 INCHES FOR THE 24 HOUR
PERIOD. A PNS STATEMENT WAS PUT OUT REGARDING THE RAINFALL AMOUNTS.
WINDS ARE STILL BREEZY FOR A FEW AREAS LIKE THE GORGE, PENDLETON,
YAKIMA AND KITTITAS VALLEY WITH OBSERVATIONS SHOWING THESE AREAS
HAVING SUSTAINED WINDS OF 20-25 MPH AND GUSTS NEAR 40 MPH. THESE
WILL BEGIN TO TAPER OFF THROUGH THE MORNING. THE MINOR FLOODING FOR
THE UMATILLA AT GIBBON HAS BEGUN TO RECEDE WITH THE LATEST WATER
HEIGHT COMING IN AT UNDER 7 FEET. THIS KEEPS THE RIVER IN ACTION
STAGE BUT BELOW MINOR. IT IS FORECASTED TO CONTINUE TO DECREASE
DROPPING BELOW ACTION STAGE FRIDAY MORNING.
MODELS SHOW THE UPPER LEVEL LOW TO BE OFF TO THE EAST OF THE REGION
AND NORTHWEST FLOW ALOFT TO BE OVER THE REGION. MODELS THEN SHOW
THAT BY MID-DAY ANOTHER UPPER LEVEL LOW WILL CLIP THE NORTHEAST
PORTION OF THE CWA BRINGING MOUNTAIN SHOWERS TO THE NORTHERN BLUES
AND ACROSS THE WALLOWAS TODAY WITH NBM SHOWING AMOUNTS NEAR 0.10
ALONG THE CRESTS AND 0.02 IN THE VALLEY WITH 60-80% PROBABILITIES.
SNOW LEVELS WILL STILL BE BELOW 45500 FEET SO SOME LIGHT SNOW
ACCUMULATIONS AT TOLLGATE AND SKI BLUEWOOD ARE LIKELY WITH 30-50%
PROBABILITIES OF SEEING 0.10-0.5 INCHES.
AFTER THURSDAY, MODELS SHOW CONTINUED NORTHWEST FLOW WITH DRIER AND
COOLER CONDITIONS. IN HOUSE SEASONAL TEMPERATURE COMPARISONS SHOW
THAT TEMPERATURES WILL BE ANYWHERE FORM 10 TO 20 DEGREES BELOW
SEASONAL AVERAGE WITH THIS FLOW PATTERN. NBM SHOWS TEMPERATURES TO
BE IN THE MID 50S THROUGH THE WEEKEND WITH ISOLATED LOCATIONS IN THE
BASIN SEEING LOW 60S WITH 50-70% CONFIDENCE. BY MONDAY, MODELS SHOW
A SLIGHT WARMING TREND.
WITH THE INCOMING COOLER TEMPERATURES FROM THE COLD AIR ALOFT AND
MODELS SHOWING THE COLD AIR MIXING TO THE SURFACE, NBM IS SHOWING
MINIMUM TEMPERATURES TO BE HEDGING TOWARDS FREEZING OVERNIGHT
TEMPERATURES. THE COLDEST TEMPERATURES ARE EXPECTED TO BE SATURDAY
MORNING WITH NBM SHOWING TEMPERATURES ACROSS THE VAST MAJORITY OF
THE REGION BEING AT OR BELOW FREEZING. WITH THAT SAID, THE POTENTIAL
FOR FREEZING ON SATURDAY IS MODERATE/HIGH WITH 60-90% CONFIDENCE. 90
AVIATION /18Z TAFS THROUGH 18Z FRIDAY/
VFR CONDITIONS TO
PREVAIL THROUGH THE PERIOD. AN ISOLATED SHOWER OR TWO MAY IMPACT
SITE ALW LATE THIS AFTERNOON IN THE EARLY EVENING, WITH A PRO30
OF LIGHT RAIN INCLUDED IN THE TAF. WINDS WILL BE 12-17KTS WITH
GUSTS UP TO 27KTS AT SITES DLS/PDT/YKM/ALW INTO THIS EVENING,
WITH LIGHT WINDS DEVELOPING OVERNIGHT. ALL OTHER SITES WILL SEE
LIGHT WINDS PREVAIL THROUGH THE PERIOD. LAWHORN/82
PRELIMINARY POINT TEMPS/POPS
PDT 60 36 56 32 / 10 30 0 0
ALW 59 37 57 35 / 30 40 10 0
PSC 66 38 63 33 / 10 20 0 0
YKM 67 39 60 34 / 0 10 0 0
HRI 64 37 60 32 / 0 20 0 0
ELN 60 34 57 32 / 0 10 0 0
RDM 63 29 57 27 / 0 0 0 0
LGD 56 34 52 30 / 20 50 10 0
GCD 58 33 52 29 / 0 10 0 0
DLS 66 41 64 37 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...90
AVIATION...82
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