528
FXUS66 KPDT 201346 CCA
AFDPDT
AREA FORECAST DISCUSSION...
NATIONAL WEATHER SERVICE PENDLETON OR
645 AM PDT TUE OCT 20 2026
KEY MESSAGES
- WARM AND DRY CONDITIONS THROUGH WEDNESDAY.
- BREEZY TO STRONG GUSTY WINDS THROUGH THE EASTERN COLUMBIA
RIVER GORGE/CASCADE GAPS THURSDAY NIGHT.
- SLIGHT CHANCES (15-25%) FOR THUNDERSTORMS ACROSS THE WALLOWAS AND
BLUE MOUNTAINS OF OREGON, WETTING RAINS, AND BREEZY WINDS.
DISCUSSION
A BAND OF THICK CLOUDS WERE SPREADING NORTH OUT OF SOUTHERN
OREGON INTO CENTRAL OREGON THIS MORNING, WITH THINNER CLOUDS
ACROSS THE FOOTHILLS AND COLUMBIA BASIN REGION AND RADAR
RETURNS FROM MRMS HAD FADED. WARMER LOW ELEVATIONS ARE EXPECTED
TODAY FOLLOWED BY WARMER FOOTHILLS AND MOUNTAIN AREAS WEDNESDAY
AFTERNOON AS AN UPPER RIDGE PROVIDES SUBSIDENCE. MODELS SHOW AN
UPPER LOW OVER THE EASTERN PACIFIC COMING ONSHORE OVER CA EARLY
THURSDAY, AND ASSOCIATED TROUGH/COLD FRONTAL BOUNDARY TO THE
NORTH OVER THE PAC NW/INTERIOR NW LATE THURSDAY THROUGH EARLY
FRIDAY. ASSOCIATED WITH THE SOUTHERLY FLOW AHEAD OF THE COLD
FRONT, SBCAPES THROUGH THE EASTERN MOUNTAINS AVERAGE ABOUT 200-300
J/KG THURSDAY AFTERNOON, WITH NBM PRINTING UP TO AROUND 20%
PROBABILITY FOR THUNDER ACROSS THE BLUE MOUNTAINS OF OREGON AND
WALLOWA COUNTY. HOWEVER, THERE IS CONSIDERABLE UNCERTAINTY IN
THUNDERSTORM POTENTIAL AS THE RANGE BETWEEN THE 25TH AND 75TH
PERCENTILE INS ABOUT 90 TO 470 J/KG. IMPACTS OF THE COLD FRONT
INCLUDE POTENTIAL FOR BREEZY TO STRONG GUSTY WINDS ACROSS THE
EASTERN COLUMBIA RIVER GORGE AND THE RIDGES AND GAPS ACROSS THE
CASCADES. NBM IS SHOWING ABOUT 50 TO 70 PERCENT CONFIDENCE IN
WIND GUSTS IN EXCESS OF 50 MPH THURSDAY NIGHT, IN THESE
LOCATIONS, FOLLOWING THE PASSAGE OF THE FRONT. THE RISK WINDOW
IS FROM ABOUT MID EVENING THROUGH FRIDAY MORNING. FINALLY,
CHANCES FOR WETTING RAINS ARE HIGH, IN THE 60 TO 90 PERCENT BY
LATE THURSDAY MORNING AND THROUGH THURSDAY NIGHT/FRIDAY MORNING
ACROSS THE BLUE MOUNTAINS AND WALLOW COUNTY. CHANCES TAPER FROM
WEST TO EAST ON FRIDAY.
AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/
CLOUDS ARE ALL HIGH LEVEL, AND NO CEILINGS OR VISIBILITY
RESTRICTIONS ARE ANTICIPATED FOR THE DURATION OF THE TAFS. WINDS
REMAIN LIGHT (UNDER 7 KNOTS).
PRELIMINARY POINT TEMPS/POPS
PDT 63 36 67 39 / 0 0 0 0
ALW 63 42 67 45 / 0 0 0 0
PSC 68 35 68 36 / 0 0 0 0
YKM 70 39 69 39 / 0 0 0 0
HRI 65 34 67 36 / 0 0 0 0
ELN 66 36 68 38 / 0 0 0 0
RDM 62 27 71 31 / 0 0 0 0
LGD 70 39 74 42 / 0 0 0 10
GCD 72 40 75 41 / 0 0 0 20
DLS 71 42 73 44 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...86
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