923
FXUS66 KPDT 090535
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1035 PM PDT WED APR 8 2026
.UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- DRY WEATHER CONTINUES THROUGH EARLY FRIDAY.
- RAIN CHANCES INCREASE INTO THE WEEKEND WITH MAINLY MOUNTAIN
THUNDERSTORMS FRIDAY INTO SATURDAY.
- COOLER, MORE SEASONABLE TEMPERATURES SUNDAY INTO NEXT WEEK.
DISCUSSION
HIGH PRESSURE WILL GRADUALLY MOVE EASTWARD THROUGH THURSDAY AS A
LARGE UPPER LOW SPINS OFF THE COAST OF OREGON AND CALIFORNIA.
THIS LOW WILL WEAKEN AND MOVE ASHORE IN CALIFORNIA LATE FRIDAY
INTO SATURDAY AS SOUTHWEST FLOW AROUND THE LOW TROUGH WILL
DOMINATE THE REGION.
A SECOND LOW WILL THEN MOVE INTO NORTHERN CALIFORNIA SUNDAY INTO
MONDAY. THE COMBINATION OF THESE TWO LOWS AND THE BROADER
THROUGH OVER THE WESTERN CONUS WILL KEEP THINGS RATHER UNSETTLED
THROUGH THE WEEKEND.
THE TROUGH WILL MOVE EASTWARD LATER MONDAY INTO TUESDAY AND
HIGH PRESSURE WILL BUILD IN BEHIND IT BRINGING A RETURN TO DRY
WEATHER FOR THE EARLY TO MIDDLE PART OF NEXT WEEK.
RAIN CHANCES WILL BEGIN LATER ON THURSDAY ACROSS CENTRAL AND
OREGON AND THE JOHN DAY HIGHLANDS AND THERE IS LOW (<20 PERCENT)
CHANCE OF THUNDERSTORMS.
AS THE LOW APPROACHES ON FRIDAY, AND SOUTHWEST FLOW INCREASES
RAIN CHANCES WILL INCREASE ACROSS CENTRAL OREGON AND THE JOHN
DAY HIGHLANDS WITH EVEN SOME LOW POPS ALL MAKING IT AS FAR NORTH
AS THE COLUMBIA BASIN BY EVENING. THUNDERSTORMS CHANCES LOOK TO
BE CONFINED TO CENTRAL OREGON AND THE JOHN DAY HIGHLANDS. THERE
IS CAPE IN THE 200-500 J/KG RANGE FRIDAY AFTERNOON, WITH LI
VALUES OF -1 TO -3 DEGREES CELSIUS. THUNDERSTORM CHANCES ARE
GENERALLY AROUND 20 PERCENT.
THE TROUGH MOVES ONSHORE LATER FRIDAY, WITH THE SECOND LOW
MOVING INLAND LATER SATURDAY. SATURDAY, ESPECIALLY HAS THE
POTENTIAL TO SEE SOME UNSETTLED CONDITIONS. THUNDERSTORM
POTENTIAL IS HIGHEST (AROUND 15 TO 20 PERCENT EVERYWHERE). LI
VALUES ARE -1 TO -3 DEGREES CELSIUS IN THE AFTERNOON AND CAPE
VALUES ARE 200-600 J/KG. ULTIMATELY ONE MAIN QUESTION IS WILL IT
JUST BE TOO CLOUDY FOR THUNDERSTORMS, AND WE WILL HAVE TO SEE
HOW GUIDANCE CHANGES OVER THE NEXT FEW DAYS AND HOW THINGS
DEVELOP.
SUNDAY ALSO LOOKS TO BE REASONABLY UNSETTLED AS THE UPPER LOW
MOVES THROUGH. THERE WILL ALSO BE SOME SNOW ACCUMULATIONS AT THE
HIGHER ELEVATIONS BUT SNOW LEVELS ARE GENERALLY ABOVE 5000 FEET.
BY MONDAY, DRIER AND MORE SEASONAL TEMPERATURES WILL MOVE IN
FOR THE START OF THE WEEK.
AVIATION /06Z TAFS THROUGH 06Z FRIDAY/
VFR CONDITIONS CURRENTLY ACROSS ALL SITES, WHICH WILL STAY THE
COURSE THROUGH THE PERIOD. WINDS WILL STAY LIGHT AND VARIABLE,
BECOMING MORE FROM THE NORTH LATE THURSDAY AFTERNOON. CEILINGS WILL
DROP TO 10KFT FOR KRDM/KBDN TOWARD THE END OF THE PERIOD. 75
PRELIMINARY POINT TEMPS/POPS
PDT 39 70 43 68 / 0 0 0 20
ALW 43 70 46 70 / 0 0 0 10
PSC 38 74 42 74 / 0 0 0 0
YKM 38 71 43 73 / 0 0 0 0
HRI 39 72 42 72 / 0 0 0 10
ELN 36 67 39 69 / 0 0 0 0
RDM 36 70 38 65 / 0 20 20 30
LGD 38 69 42 70 / 0 0 0 30
GCD 39 71 44 65 / 0 20 20 70
DLS 43 74 48 73 / 0 0 0 10
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...77
AVIATION...75
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page