913
FXUS66 KPDT 051713
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1013 AM PDT FRI JUN 5 2026
KEY MESSAGES
- SHOWERS AND ISOLATED THUNDERSTORMS ALONG THE CASCADE CREST
TODAY AND SATURDAY
- BREEZY WINDS OVER THE LOWER ELEVATIONS TODAY AND SATURDAY
- DRY CONDITIONS SUNDAY BEFORE AN ACTIVE WEATHER PATTERN RETURNS
THROUGH THE MIDDLE OF NEXT WEEK
DISCUSSION
DIFFLUENT FLOW ALOFT WAS IN PLACE ACROSS WASHINGTON AND OREGON
AHEAD OF A 540 DM UPPER LOW NEAR 52N AND 135W. THIS UPPER LOW IS
FORECAST TO PIVOT SOUTHEAST REACHING THE THE PAC NW COAST ON
FRIDAY NIGHT AND SPREADING INLAND AND SHEARING OUT AS AN
AMPLIFIED TROUGH THROUGH SATURDAY NIGHT. THIS WILL BRING
SENSIBLE WEATHER INCLUDING WINDS, RAINS, POTENTIALLY
THUNDERSTORMS AND WETTING RAINS TO THE HIGHER MOUNTAIN ZONES.
AS FOR TODAY, THERE IS A SHORT DURATION FROM MID AFTERNOON
THROUGH ABOUT 6 OR 7 PM FOR POTENTIAL (UP TO 60% CHANCES) FOR
LOW END ADVISORY LEVEL SUSTAINED WIND SPEEDS OF 30 MPH AND GUSTS
AROUND 40 MPH BETWEEN THE DALLES AND GOLDENDALE, IN THE EASTERN
COLUMBIA RIVER GORGE.
DRY CONDITIONS WILL BEGIN TO GIVE WAY TO BY LATE TODAY ACROSS
THE WASHINGTON CASCADE CREST AND THE OREGON CREST THROUGH
SATURDAY MORNING. THIS UPPER LOW DOES NOT DEVELOP FAR ENOUGH
SOUTH TO BRING WETTING RAINS TO THE EASTERN MOUNTAINS, LEAVING
THEM VIRTUALLY DRY AS CASCADE SHOWERS END SATURDAY AFTERNOON.
SUNDAY WILL REMAIN DRY AS A SHORTWAVE RIDGE SHIFTS ACROSS THE
AREA IN A PROGRESSIVE PATTERN THAT SETS UP ANOTHER UPPER COLD
CORE LOW TO SPREAD, FARTHER SOUTH THIS TIME, ACROSS THE INTERIOR
NW LATE MONDAY THROUGH TUESDAY AFTERNOON. THIS SECOND UPPER
LOW, WITH ITS FARTHER SOUTHWARD TRACK HAS A GREATER PROBABILITY
FOR SPREADING RAINS, EVEN WETTING RAINS ACROSS THE EASTERN
MOUNTAINS MONDAY INTO TUESDAY. SLIGHTLY COOLER TEMPERATURES DUE
TO THE WEATHER SYSTEM IN THE WEEKEND AND EARLY NEXT WEEK,
CHARACTERIZED BY MEAN NBM HIGH TEMPS IN THE LOW TO MID 70S
ACROSS THE COLUMBIA BASIN/RIVER GORGE AND YAKIMA VALLEY, TO
UPPER 60S IN THE KITTITAS VALLEY AND CENTRAL OREGON, AND MID
MUCH COOLER 50S IN MOST OF THE MOUNTAIN ZONES. RUSSELL/71
AVIATION /18Z TAFS THROUGH 18Z SATURDAY/
BREEZY WINDS AND MID-LEVEL CLOUDS ARE PRESENT THIS MORNING
ACROSS THE MAJORITY OF THE REGION. BREEZY TO WINDY CONDITIONS
(SUSTAINED WINDS OF 10-20 KTS WITH HIGHER GUSTS) ARE FORECAST
THIS AFTERNOON AND EVENING AT ALL SITES, AND ARE THEN EXPECTED
TO SLACKEN OVERNIGHT.
VFR CIGS ARE CURRENTLY FORECAST AT ALL SITES. HOWEVER, SHOULD
NOTE THE 12Z HREF SUGGESTS A LOW-MEDIUM (30-50 PERCENT) CHANCE
OF MVFR CIGS OVERNIGHT INTO SATURDAY MORNING AT RDM/BDN WITH
LOWER CHANCES (20 PERCENT OR LESS) AT PDT/ALW/YKM/DLS.
SHOWER CHANCES ARE VERY LOW (5 PERCENT OR LESS) FOR ALL SITES
THROUGH THE PERIOD.
FIRE WEATHER
DRY AND BREEZY CONDITIONS WILL OVERLAP THIS AFTERNOON ACROSS
THE EASTERN COLUMBIA GORGE AND OREGON COLUMBIA BASIN WHERE
COMBINED PROBABILITY FOR RH AND WIND SPEEDS OF 20% OR LESS AND
15 MPH RESPECTIVELY AREA ARE AROUND 40 TO 60%. FUELS ARE NOT
QUITE CURED ENOUGH FOR RED FLAG CONCERNS IN THESE ZONES, YET.
FARTHER NORTH OVER THE WASHINGTON COLUMBIA BASIN WHERE FUELS
HAVE CURED MORE, COMBINED PROBABILITIES ON FRIDAY FOR THESE RH
AND WINDS ARE AROUND 5-25%. RUSSELL/71
PRELIMINARY POINT TEMPS/POPS
PDT 72 44 66 41 / 0 0 0 0
ALW 74 50 67 45 / 0 0 0 10
PSC 77 47 71 42 / 0 0 0 0
YKM 74 43 68 40 / 0 0 20 10
HRI 74 46 69 41 / 0 0 0 0
ELN 66 38 59 36 / 0 0 40 10
RDM 73 37 62 29 / 0 0 0 10
LGD 74 44 63 38 / 0 0 0 10
GCD 79 41 64 36 / 0 0 0 20
DLS 71 48 66 43 / 0 10 30 10
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...86
FIRE WEATHER...71
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