265
FXUS66 KPDT 191706
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1006 AM PDT SUN APR 19 2026
KEY MESSAGES
- WARMER TEMPERATURES CONTINUE THROUGH TUESDAY, WITH COOLER
TEMPERATURES TO FOLLOW BY A COLD FRONTAL PASSAGE IN THE
MIDWEEK.
- WIDESPREAD 10-25% CHANCES OF THUNDERSTORMS WITH ISOLATED TO
SCATTERED DEVELOPMENT TUESDAY, WITH MUCH LESS COVERAGE THROUGH
THE EARLY WEDNESDAY MORNING HOURS.
- BREEZY TO LOCALLY WINDY CONDITIONS POSSIBLE GOING INTO
WEDNESDAY AS THE COLD FRONTAL SYSTEM PASSES THROUGH THE
REGION.
DISCUSSION
NOW THROUGH TUESDAY MORNING: AN OVERHEAD RIDGE IS PROMOTING DRY
AND MOSTLY CLEAR CONDITIONS THROUGH THE NEXT 48 HOURS.
TEMPERATURES WILL CONTINUE TO TREND WARMER THROUGH MONDAY WITH
AREAS IN THE COLUMBIA BASIN REACHING THE LOW TO MID 80S AND MID
TO HIGH 70S IN SOME OF THE HIGHER ELEVATED POPULATION CENTERS
(>90% CHANCES IN BOTH SCENARIOS). WINDS WILL REMAIN LIGHT AND
VARIABLE FOR THE MOST PART, WITH A BRIEF 10-20 MPH GUST POSSIBLE
LATE MONDAY INTO TUESDAY MORNING (40-60% CHANCE).
TUESDAY MORNING THROUGH WEDNESDAY: MODEL GUIDANCE IS IN VERY
GOOD AGREEMENT THAT THE RIDGE WILL QUICKLY LOSE INFLUENCE BY
TUESDAY MORNING WITH A LOW PRESSURE SYSTEM EMBEDDED WITH A COLD
FRONT WILL PUSH ONSHORE AND BRING UNSETTLED WEATHER INTO THE
REGION. SUFFICIENT MOISTURE TRANSPORTATION FROM THE SOUTH AND
DAYTIME HEATING BUILD-UP WILL AID IN THE DEVELOPMENT OF UNSTABLE
ATMOSPHERIC CONDITIONS, WHICH INCLUDES CAPE VALUES OF 150-400
J/KG. NBM IS BRINGING 10-25% CHANCES OF THUNDERSTORM DEVELOPMENT
ACROSS MUCH OF THE AREA TUESDAY MORNING THROUGH TUESDAY NIGHT,
WITH SOME LINGERING STORMS IN THE WASHINGTON COLUMBIA BASIN IN
THE EARLY WEDNESDAY MORNING HOURS.
AFTER THE COLD FRONT PASSES THROUGH THE AREA TUESDAY MORNING,
TIGHT PRESSURE GRADIENTS FROM THE SYSTEM WILL STIR CHANCES OF
30-40 MPH WIND GUSTS ACROSS THE AREA WEDNESDAY MORNING INTO THE
EARLY EVENING HOURS. NBM PROBABILITIES CURRENTLY DON'T
ANTICIPATE ANY DECENT COVERAGE PROBABILITIES OF GREATER THAN 45
MPH GUSTS ON WEDNESDAY. DROPPING THE THRESHOLD TO 30 MPH OR
GREATER YIELDS 20-50% CHANCES ACROSS THE REGION. NOT SUPER
CONFIDENT IN WIND ADVISORIES CRITERIA YET, BUT WILL SEE HOW
TRENDS CONTINUE IN THE NEXT 48-HOURS. ON THE RAIN SIDE, CHANCES
OF WETTING RAIN ARE DECENT WITH THE GREATEST 6-HOUR RAINFALL
AMOUNT ACCORDING TO THE LATEST GUIDANCE IS THE EARLY TO LATE
MORNING HOURS OF WEDNESDAY. WETTING RAIN CHANCES ARE HIGHEST IN
THIS PERIOD WITH 50-70% CHANCES ACROSS THE NORTHERN BLUE
MOUNTAINS & 40-60% CHANCES ACROSS THE FOOTHILLS OF THE BLUES AND
LARGE PORTIONS OF THE COLUMBIA BASIN.
AVIATION /18Z TAFS THROUGH 18Z MONDAY/
VFR CONDITIONS ARE EXPECTED THROUGH MONDAY. WINDS WILL MAINLY
BE 10 KTS OR LESS THROUGH THE PERIOD, THOUGH SOME AFTERNOON
BREEZES COULD REACH THE 10 TO 15 KT RANGE AT TIMES.
PRELIMINARY POINT TEMPS/POPS
PDT 73 44 77 48 / 0 0 0 10
ALW 73 49 77 52 / 0 0 0 10
PSC 77 45 81 50 / 0 0 0 10
YKM 75 47 79 50 / 0 0 0 10
HRI 75 45 80 49 / 0 0 0 10
ELN 70 45 75 47 / 0 0 0 10
RDM 74 41 75 42 / 0 0 10 10
LGD 68 42 75 44 / 0 0 0 10
GCD 72 44 77 44 / 0 0 10 10
DLS 75 52 79 52 / 0 0 10 10
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...95
AVIATION...77
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