835
FXUS66 KPDT 051750 AAA
AFDPDT
AREA FORECAST DISCUSSION...UPDATED AVIATION.
NATIONAL WEATHER SERVICE PENDLETON OR
1050 AM PDT MON OCT 5 2026
KEY MESSAGES
- UPPER LEVEL HIGH PRESSURE OVER THE REGION WILL CONTINUE TO
BRING DRY CONDITIONS AND ABOVE NORMAL TEMPERATURES THROUGH
THURSDAY
- LOCALLY BREEZY WINDS THROUGH THE CASCADE GAPS MONDAY AFTERNOON
- GROWING POTENTIAL FOR MOUNTAIN SHOWERS FRIDAY INTO NEXT
WEEKEND
DISCUSSION
A BROAD FLAT UPPER RIDGE WAS POSITIONED ACROSS THE WESTERN US
WITH A TIGHTER UPPER LEVEL HEIGHT GRADIENT AND ZONAL FLOW FROM
NORTHERN WA INTO THE WESTERN CANADA. THIS IS A WARM PATTERN FOR
THE INTERIOR NW AND TODAY IS THE WARMEST DAY OF THIS UPCOMING
PERIOD AS SURFACE WINDS ARE LARGELY WESTERLY AND DOWNSLOPING
INTO THE COLUMBIA BASIN, ALTHOUGH STILL LIGHT ACROSS MOST OF THE
THE AREA. LOW END BREEZY CONDITIONS FORECAST ACROSS THE
KITTITAS VALLEY AND THE EASTERN COLUMBIA RIVER GORGE NEAR THE
DALLES AND NORTH CENTRAL OREGON THIS AFTERNOON ARE THE
EXCEPTIONS, AS THE NBM MEAN SHOWS ABOUT 22-23 MPH WINDS IN THE
LATTER HALF OF THE AFTERNOON. LIGHT, MAINLY TERRAIN/DIURNALLY
DRIVEN WINDS CONTINUE THROUGH ABOUT THURSDAY NIGHT BEFORE THE
NEXT PATTERN CHANGE MAY HAVE MINOR IMPACTS ON THE AREA. TUESDAY
AND WEDNESDAY WILL NOT BE AS WARM ACROSS THE LOWER ELEVATIONS AS
THE WIND TRAJECTORIES ARE LIGHTENER AND MORE NORTHERLY/EASTERLY
ACROSS THE COLUMBIA BASIN AND FOOTHILLS OF THE BLUES. SOME OF
THE WARMEST AREAS THESE DAYS WILL BE IN THE JOHN DAY BASIN AND
CENTRAL OREGON MOUNTAINS WHERE THE NBM IS HANGING ON TO MID 80S
AND EVEN AROUND 90 DEGREES IN THE JOHN DAY BASIN. SOMETIME
FRIDAY INTO SATURDAY A PATTERN CHANGE MAY COOL TEMPERATURES
ACROSS THE REGION WITH LOW CHANCES FOR PRECIPITATION (15% ACROSS
THE MOUNTAIN ZONES, HIGHER TO NEAR 50% ACROSS THE WA CASCADE
CREST). HOWEVER, THERE IS SIGNIFICANT DIFFERENCES IN THE
ENSEMBLES FOR THIS PERIOD FROM ABOUT FRIDAY OCT 9 THROUGH SUNDAY
OCT 11 WHERE THE FIRST AND SECOND CLUSTER GROUPS SHOW A SLIGHT
TROUGHING INFLUENCE WHEREAS THE OTHER CLUSTERS OFFER CONTINUED
RIDGING (I.E. COOLER, WETTER VS DRY AND WARMER).
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
VFR CONDITIONS AREA-WIDE
WITH LOW AVIATION CONCERNS THE NEXT 24-HRS. LATEST SATELLITE IMAGERY
SHOWS EASTWARD MOVING MID AND HIGH CLOUDS ACROSS WA ASSOCIATED WITH
A WEAK DISTURBANCE. BEYOND THESE HIGH-END VFR CLOUDS (GREATER THAN 7
KFT), A WEAK SYNOPTICALLY IMPOSED PRESSURE GRADIENT WILL SETUP
PROMOTING MODEST GUSTS AT KDLS WITH LIGHT BREEZES ELSEWHERE. 60-70%
CHANCE OF GUSTS 22 KTS/25 MPH OR MORE AT KDLS WITH LOWER CHANCES FOR
26 KTS/30 MPH OR MORE (~40%). WHILE INFREQUENT GUSTS 15-20 KTS
CANNOT BE RULED OUT AT OTHER TAF SITES, GUST POTENTIAL IS LOW. WINDS
WILL DROP OFF DURING THE EVENING WITH DRAINAGE AND LIGHT WINDS
EXPECTED OVERNIGHT.
PRELIMINARY POINT TEMPS/POPS
PDT 82 47 80 47 / 0 0 0 0
ALW 83 54 80 53 / 0 0 0 0
PSC 83 48 80 45 / 0 0 0 0
YKM 83 50 80 49 / 0 0 0 0
HRI 84 49 81 46 / 0 0 0 0
ELN 78 47 77 46 / 0 0 0 0
RDM 86 43 84 41 / 0 0 0 0
LGD 86 47 83 46 / 0 0 0 0
GCD 88 48 86 49 / 0 0 0 0
DLS 86 51 84 52 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...80
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