357
FXUS66 KPDT 261118
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
418 AM PDT SUN APR 26 2026
KEY MESSAGES
- FREEZING THIS MORNING IN THE COLUMBIA BASIN AND ALONG THE
BLUE MOUNTAIN FOOTHILLS
- SLIGHT CHANCE OF SHOWERS EACH DAY THROUGH TUESDAY, MAINLY
OVER THE MOUNTAINS
- GRADUALLY WARMING TO NEAR OR ABOVE NORMAL THROUGH NEXT WEEK
DISCUSSION
TEMPERATURES ARE LOOKING TO REMAIN MOSTLY ABOVE FREEZING FOR
THE BALANCE OF OVERNIGHT AND EARLY THIS MORNING AS TEMPS AS OF 2
AM LOOK TO BE ABOUT 3 TO 4 DEGREES WARMER THAN THE PREVIOUS
OVERNIGHT AT THIS TIME. STILL ISOLATED LOWER LYING AREAS HAVE
TOUCHED FREEZING BRIEFLY, WHILE AREAS AROUND THE SNAKE/COLUMBIA
RIVER CONFLUENCE, ELLENSBURG AND PENDLETON HAVE SEEN TEMPS
BETWEEN 30 AND 32F. TEMPERATURES THIS AFTERNOON WILL REACH THE
LOW TO MID 60S ACROSS THE YAKIMA VALLEY AND COLUMBIA BASIN AND
AT LEAST THE LOWER 50S INTO THE FOOTHILLS OF THE BLUES. A BROAD
SURFACE INVERTED TROUGH IS NOTED WITH UPPER LEVEL FLOW ALOFT
TRANSITIONING FROM WEAK CYCLONIC FLOW TO MORE ANTICYCLONIC BY
MONDAY ONWARD. SHOWERS ARE EXPECTED ACROSS THE CASCADES RANGE
AS EARLY AS MONDAY WITH AREAS LIKE THE DESCHUTES COUNTY BEING
FAVORED FOR SNOW ABOVE 5000 FT, AND LIKEWISE THE AREA OF THE
EASTERN MOUNTAINS ON MONDAY AFTERNOON. THE COOLER AIR ALOFT WILL
LEAD TO INSTABILITY WITH 10-15% CHANCES FOR THUNDERSTORMS
(ISOLATED) ACROSS THE BLUE MOUNTAINS EMBEDDED IN MORE WIDELY
SCATTERED SHOWERS. DIURNALLY BREEZY CONDITIONS ON MONDAY AND
TUESDAY THROUGH THE KITTITAS VALLEY AND AND THE EASTERN COLUMBIA
RIVER GORGE/COLUMBIA BASIN. MID TO LATE WEEK AN UPPER LEVEL
AMPLIFIED RIDGE DEVELOPS ON THE ENSEMBLES RESULTING IN DRY AND
WARM WEATHER RISING THROUGH THE 70S EACH AFTERNOON.
AVIATION /12Z TAFS THROUGH 12Z MONDAY/
VFR CONDITIONS ARE AGAIN EXPECTED THROUGH THIS TAF PERIOD. ANY
CLOUDS WILL BE MID LEVEL (9,000 FT AGL) OR HIGHER, ENSURING NO
RESTRICTIONS, WITH LIGHT AND VARIABLE SURFACE WINDS.
PRELIMINARY POINT TEMPS/POPS
PDT 62 39 65 41 / 0 0 10 0
ALW 62 42 65 45 / 10 10 20 10
PSC 67 41 71 44 / 0 10 0 0
YKM 67 39 69 41 / 10 10 0 0
HRI 66 41 69 44 / 0 0 0 0
ELN 62 36 64 40 / 10 10 10 0
RDM 59 30 61 31 / 0 10 0 0
LGD 57 33 59 36 / 10 10 40 20
GCD 56 32 58 34 / 10 0 40 10
DLS 69 44 67 45 / 10 10 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...71
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