553
FXUS66 KPDT 031728
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1028 AM PDT WED SEP 3 2025
.UPDATED AVIATION.
AVIATION...18Z TAFS
VFR CONDITIONS PREVAIL THROUGH THE PERIOD.
LINGERING HAZE AND SMOKE PREVAILS ACROSS THE AREA. NOT EXPECTING
ANY MAJOR IMPACTS IN REGARDS TO VIS. PRECIP WISE, PUT PROB30 RAIN
SHOWERS FOR BDN/RDM FOR LATER THIS MORNING INTO THE AFTERNOON.
WINDS REMAIN GENERALLY LIGHT AND VARIABLE.
PREV DISCUSSION
/ISSUED 1110 PM PDT TUE SEP 2 2025/
EVENING UPDATE...EXPANDED AND EXTENDED HEAT ADVISORIES THROUGH 8
PM PDT THURSDAY FOR MULTIPLE FORECAST ZONES IN SOUTH-CENTRAL TO
SOUTHEAST WASHINGTON AND EASTERN OREGON. WHILE OVERNIGHT
TEMPERATURES WILL LIKELY (>70% CONFIDENCE) STAY UNSEASONABLY
MILD/WARM IN CENTRAL OREGON DUE TO CLOUD COVER, OPTED TO EXPIRE
THE HEAT ADVISORY THAT WAS IN EFFECT DUE TO INSUFFICIENT
CONFIDENCE THAT WEDNESDAY AFTERNOON HIGH TEMPERATURES WILL REACH
ADVISORY THRESHOLDS RELATIVE TO MORE CLOUD-FREE AREAS TO THE NORTH
AND EAST WHERE EXPANSIONS/EXTENSIONS WERE MADE. PLUNKETT/86
PREV DISCUSSION... /ISSUED 217 PM PDT TUE SEP 2 2025/
DISCUSSION...SATELLITE SHOWS SOME HAZE/SMOKE MAKING ITS WAY INTO
THE PENDLETON AREA. WE'LL SEE THIS PERSIST THROUGH AT LEAST THE
NEXT DAY. LIGHT AND VARIABLE WINDS WILL LEAD TO LESS TRANSPORT OF
THE SMOKE. SMOKE CAUSED BY THE WILDCAT FIRES IS MOSTLY RESPONSIBLE
FOR THE AIR QUALITY ALERT OUT FOR KITTITAS AND YAKIMA COUNTY.
GOING THROUGH THE WEEK, AN UPPER LEVEL RIDGE OVER THE PACNW WILL
CONTINUE TO BUILD INTO THE AREA, BRINGING SPOTTY TRIPLE DIGIT
TEMPERATURES ACROSS THE BASIN. TEMPERATURES WILL GRADUALLY WARM UP
ANOTHER 5-10 DEGREES THROUGH THURSDAY, UNTIL THE RIDGE PUSHES OFF
TO THE WEST. EXTREME HEAT WARNINGS AND HEAT ADVISORIES ARE ISSUED
ACROSS MOST OF THE REGION. CENTRAL OR WILL COOL DOWN QUICKER BELOW
MAJOR LEVEL THANKS TO INCOMING CLOUDS AND SHOWERS FROM AN UPPER
LEVEL LOW OVER CALIFORNIA. THIS UPPER FEATURE WILL BRING
SHOWERS/THUNDERSTORMS TO THE CENTRAL OR REGION THROUGH OVERNIGHT
TONIGHT AND EVERY DAY THROUGH THE MIDDLE OF THE WEEK. CHANCES ARE
SLIGHT (15-25% CHANCE) OF STORMS DEVELOPING OVER CENTRAL OR.
STORMS ARE LIKELY TO BE DRY GOING THROUGH TONIGHT, BUT WILL
PROGRESSIVELY BECOME WETTER AS THE WEEK GOES ON. EXPECTING
COVERAGE OF SHOWER ACTIVITY TO EXPAND THROUGH THE SOUTHERN BLUE
MOUNTAINS AND PARTS OF THE FOOTHILLS BY LATE THIS WEEK, GIVING US
RELIEF FROM THE HEAT WE WILL EXPERIENCE OVER THE NEXT COUPLE OF
DAYS.
WITH THE CAVEAT OF DRY THUNDERSTORMS, A RED FLAG WARNING WAS
ISSUED FOR PARTS OF CENTRAL OR THROUGH TOMORROW. UNSURE ABOUT
WEDNESDAY AND BEYOND AS CONFIDENCE DROPS (>15%) ON WHETHER OR NOT
LIGHTNING WILL VERIFY AN EVENT. CAMS SUGGEST >40 DBZ PAINTBALLS
GOING THROUGH TOMORROW ON THE SOUTHERN PART OF DESCHUTES COUNTY.
COUPLED WITH LOW PWAT VALUES OF 0.7-0.9", A WARNING WAS ISSUED.
THROUGH THE END OF THE WEEK GOING INTO NEXT WEEK, GUIDANCE SUGGEST
TEMPERATURES COOLING TO THE HIGH 70S TO LOW 80S, ALTHOUGH AT THE
EXPENSE OF WIDESPREAD PRECIP COVERAGE, THANKS TO A TROUGH MOVING
ASHORE FROM THE GULF OF ALASKA INTO THE PACNW. ALTHOUGH NEED TO
KEEP AN EYE ON THUNDERSTORM COVERAGE GOING INTO THE WEEKEND, NOT
ANTICIPATING ANYTHING TO SUGGEST WE WILL SEE DRY STORM EVENTS.
PRELIMINARY POINT TEMPS/POPS
PDT 98 66 96 65 / 0 0 0 0
ALW 100 72 98 70 / 0 0 0 0
PSC 101 64 99 64 / 0 0 0 0
YKM 102 68 99 66 / 0 0 0 0
HRI 100 65 98 64 / 0 0 0 0
ELN 100 65 97 62 / 0 0 0 0
RDM 91 54 94 56 / 10 20 10 10
LGD 99 62 95 61 / 0 10 0 0
GCD 95 62 93 60 / 10 10 0 10
DLS 100 68 99 68 / 0 10 10 10
PDT WATCHES/WARNINGS/ADVISORIES
OR...EXTREME HEAT WARNING UNTIL 8 PM PDT THURSDAY FOR ORZ041-044-507-
508-510.
HEAT ADVISORY UNTIL 8 PM PDT THURSDAY FOR ORZ049-050-502-505.
RED FLAG WARNING UNTIL 8 PM PDT THIS EVENING FOR ORZ705.
WA...EXTREME HEAT WARNING UNTIL 8 PM PDT THURSDAY FOR WAZ024-026>029-
521.
HEAT ADVISORY UNTIL 8 PM PDT THURSDAY FOR WAZ030-523.
SHORT TERM...95
LONG TERM....95
AVIATION...95
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