367
FXUS66 KPDT 211041
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
341 AM PDT THU MAY 21 2026
KEY MESSAGES
- DRY AND WARMER CONDITIONS THROUGH SATURDAY
- BREEZY TO WINDY OVER THE WEEKEND
- INCREASING CONFIDENCE IN COOLER AND WETTER
WEATHER EARLY NEXT WEEK
DISCUSSION
DARKENING IN THE MID LEVEL WATER VAPOR GOES IMAGERY SHOWED THE
SHORTWAVE MOVING SOUTHEAST THROUGH THE IDAHO PANHANDLE DRIVING
THE SURFACE LAYER COLD FRONT SOUTHWEST AS SEEN BY THE NE WA
OBSERVATIONS. THE WEAK COLD FRONT WILL HAVE LITTLE IMPACT ON THE
PDT AREA AND HIGH TEMPERATURES WILL BE SIMILAR TO YESTERDAYS AND
ON AVERAGE A COUPLE OF DEGREES WARMER. BEYOND TODAY, AND
THROUGH SATURDAY AFTERNOON TEMPERATURES WILL BE ON THE RISE,
REACHING HIGHS IN THE MID 80S ACROSS THE YAKIMA VALLEY, CENTRAL
OREGON AND THE FOOTHILLS OF THE BLUE MOUNTAINS. HIGHS COULD HIT
AROUND 90 DEGREES IN PART SO THE LOWER COLUMBIA AND JOHN DAY
BASINS. BREEZY TO WINDY CONDITIONS OVER THE WEEKEND THROUGH
ONSHORE FLOW AND PRESSURE GRADIENTS ACROSS THE CASCADES GAPS.
LOOKING AT THE NBM MEAN GUSTS, 30 TO 40 MPH GUSTS COULD BE
EXPECTED THOUGH THE KITTITAS VALLEY, EASTERN COLUMBIA RIVER
GORGE AND BLUE MOUNTAIN FOOTHILLS/COLUMBIA BASIN OF OREGON.
BASED ON NBM MEMBERS, THERE IS ABOUT A 20 TO 60% CHANCES FOR
ADVISORY LEVEL WIND GUSTS IN EXCESS OF 45 MPH ACROSS AREAS OF
THESE AFOREMENTIONED ZONES.
A LOOK AT THE ENSEMBLES FOR THE LATE WEEKEND AND EARLY NEXT
WEEK LEADS TO HIGH CONFIDENCE IN THE TRANSITION TO WETTER, AND
COOLER WEATHER WITH ALSO MEAN QPFS INDICATING WETTING RAINS
ACROSS THE MOUNTAIN ZONES. MOUNTAIN ZONE PROBABILITIES OF
WETTING RAINS (GREATER THAN ONE TENTH OF AN INCH) ARE ABOUT
60-95% MONDAY INTO TUESDAY.
AVIATION /12Z TAFS THROUGH 12Z FRIDAY/
CLEAR SKY VFR CATEGORY CONDITIONS WILL PERSIST ACROSS THE AREA
FOR THE DURATION OF THE TAFS. WINDS LOOK TO BE LIGHT NORTHERLY
THROUGH TODAY BUT BECOME MORE LIGHT AND VARIABLE BY TONIGHT.
PRELIMINARY POINT TEMPS/POPS
PDT 75 47 80 49 / 0 0 0 0
ALW 76 50 80 53 / 0 0 0 0
PSC 80 50 85 52 / 0 0 0 0
YKM 80 52 84 54 / 0 0 0 0
HRI 79 49 83 52 / 0 0 0 0
ELN 74 47 79 50 / 0 0 0 0
RDM 77 41 81 44 / 0 0 0 0
LGD 72 43 77 45 / 0 0 0 0
GCD 75 40 80 43 / 0 0 0 0
DLS 82 54 85 54 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...71
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