738
FXUS66 KPDT 310444
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
944 PM PDT SAT MAY 30 2026
KEY MESSAGES
- WARMING TEMPERATURES THROUGH MIDWEEK.
- DRY CONDITIONS FOR MUCH OF THE WEEK, WITH THE POTENTIAL FOR
MAINLY MOUNTAIN SHOWERS AND THUNDERSTORMS AROUND MIDWEEK.
DISCUSSION
A MORE ZONAL FLOW IS EXPECTED TO DEVELOP OVER THE REGION AS AN
UPPER LOW OVER THE NORTHERN ROCKIES MOVES NORTHEAST. BY SUNDAY,
A WEAK UPPER LOW WILL MOVE OVER THE AREA, BUT IS EXPECTED TO BE
DRY. THIS LOW WILL THEN HELP CARVE OUT A BROADER TROUGH THAT
WILL SHIFT EASTWARD WITH THE UPPER LOW MOVING TO NORTHERN
MONTANA/SOUTHERN CANADA BY MONDAY NIGHT. CAN'T RULE OUT A
PASSING SHOWER WITH THE LOW, ESPECIALLY OVER THE MOUNTAINS, BUT
OVERALL CHANCES ARE LOW (<20 PERCENT).
AS THIS LOW SPINS TO THE NORTHEAST, WEAK RIDGING WILL BUILD IN
FOR TUESDAY. A WEAK TROUGH AND SOME SHORTWAVE ENERGY WILL THEN
MOVE ACROSS THE REGION WEDNESDAY INTO THURSDAY. WITH THIS
FEATURE WILL COME THE BEST CHANCES FOR PRECIPITATION AND
THUNDERSTORMS IN THE NEXT 7 DAYS. THUNDERSTORM CHANCES, ALTHOUGH
LOW (<20 PERCENT) LOOK TO BE HIGHEST OVER THE MOUNTAINS OF
CENTRAL AND EASTERN OREGON).
DRY AND A BIT COOLER WEATHER RETURNS FOR THURSDAY AND FRIDAY.
BY SATURDAY, PRECIPITATION MAY START TO RETURN, ESPECIALLY TO
THE CASCADES AS AN UPPER LOW OFF THE COAST APPROACHES THE
REGION. THERE IS STILL SOME UNCERTAINTY WITH THE TIMING OF THIS
SYSTEM, AND WE ARE A WEEK AWAY BUT IT WILL BEAR WATCHING.
ADDITIONALLY, DEPENDING ON THE TRACK AND TIMING, WINDS MAY BEGIN
TO INCREASE AS EARLY AS FRIDAY, OR INTO SATURDAY ACROSS
PORTIONS OF THE AREA.
AVIATION /06Z TAFS THROUGH 06Z MONDAY/
REGIONAL SATELLITE IMAGERY SHOWED CLEAR SKY OTHER THAN SOME
HIGH LEVEL THIN CLOUDS OVER PSC/ALW/PDT, WITH NO IMPACTS TO
TERMINALS. BREEZY WINDS WITH GUSTS AROUND 20 KNOTS WILL CONTINUE
THOUGH AROUND 10Z AT YKM AND DLS, BUT ARE EXPECTED TO BE BELOW
12 KNOTS ELSEWHERE.
PRELIMINARY POINT TEMPS/POPS
PDT 42 71 45 76 / 0 0 0 0
ALW 47 72 50 76 / 0 0 0 0
PSC 43 77 48 80 / 0 0 0 0
YKM 42 77 48 80 / 0 0 0 0
HRI 43 75 47 79 / 0 0 0 0
ELN 39 71 45 75 / 0 0 0 0
RDM 29 67 34 73 / 0 0 0 0
LGD 37 68 41 72 / 0 0 0 0
GCD 34 70 37 75 / 0 0 0 0
DLS 45 76 49 83 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...77
AVIATION...71
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