000
FXUS66 KPDT 061502
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
802 AM PDT SAT SEP 6 2025
MORNING UPDATE
MADE A MENTION OF THUNDER ACROSS THE COLUMBIA
BASIN WITH THE SHOWERS THIS MORNING, AS HAVE HAD A FEW OBS OF
LIGHTNING, ALBEIT ISOLATED. ANOTHER ROUND OF SHOWERS AND STORMS IS
EXPECTED TO FORM LATER THIS AFTERNOON.
PREV DISCUSSION
/ISSUED 1034 PM PDT FRI SEP 5 2025/
UPDATED AVIATION...06Z TAFS...VFR CONDITIONS ARE FORECAST FOR
ALL SITES THROUGH THE FORECAST PERIOD. TEMPORARY 6SM VSBYS IN
SHOWERS & THUNDERSTORMS ARE FORECAST BRIEFLY TONIGHT AT BDN/RDM,
AND CONFIDENCE IN VSBYS IN FU/HZ AT YKM/PSC OVERNIGHT AND SATURDAY
IS HIGH (>80%) WITH PSC SEEING MVFR AT 4SM DUE TO HZ STARTING
AROUND 12Z AND LASTING THROUGH 02Z. HOWEVER, CONFIDENCE IN THE
LENGTH OF TIME AT MVFR IS LOW (<40%). CIGS WILL REMAIN 15-25 KFT
ACROSS ALL SITES WITH WINDS BEING BELOW 10 KTS WITH ONLY DLS
SEEING GUSTS TO 15 KTS THROUGH 11Z. BENNESE/90
PREV DISCUSSION... /ISSUED 203 PM PDT FRI SEP 5 2025/
DISCUSSION...AN UPPER LOW OFF THE COAST WILL GRADUALLY MOVE
EASTWARD THROUGH MONDAY, WITH THE BROADER UPPER TROUGH IMPACTING
THE AREA OVER THE WEEKEND.
SHOWERS AND THUNDERSTORMS WILL AFFECT THE PACIFIC NORTHWEST OVER
THE NEXT FEW DAYS...MAINLY OVER CENTRAL OREGON TODAY, THEN CENTRAL
OREGON AND THE CASCADES ON SATURDAY. A RED FLAG WARNING REMAINS IN
EFFECT THROUGH THIS EVENING. THUNDERSTORMS LOOK TO BECOME MORE
WET THROUGH THE WEEKEND AND SOME AREAS, ESPECIALLY THE MOUNTAINS
AND CENTRAL OREGON COULD END UP GETTING SOME DECENT RAINFALL
AMOUNTS.
THE BIGGEST QUESTION REMAINS ABOUT CLOUD-TO-GROUND LIGHTNING
STRIKES, AND HOW MANY IN A GIVEN AREA AND WHAT THAT IMPACT WILL
BE ON ANY NEW FIRE STARTS, ESPECIALLY ON SATURDAY. OTHER QUESTIONS
ARE WHAT IMPACT SMOKE WILL HAVE ON THUNDERSTORM DEVELOPMENT AND IF
RAIN WILL ALLEVIATE CONCERNS FROM LIGHTNING, AT LEAST IN SOME
AREAS. WILL NEED TO KEEP WATCH ON THIS TO SEE IF ANY FIRE WEATHER
HEADLINES BECOME NECESSARY.
BY WEDNESDAY, MORE GENERALLY LOW (<=30%) PRECIPITATION CHANCES
ARE EXPECTED AS AN UPPER TROUGH REMAINS OVER THE WESTERN CONUS.
HIGH TEMPERATURES WILL COOL EACH DAY THROUGH THE WEEKEND AND INTO
EARLY NEXT WEEK AND WILL RETURN TO SEASONAL NORMALS BY EARLY NEXT
WEEK. HIGH TEMPERATURES ARE EXPECTED TO REMAIN NEAR NORMAL
THROUGH THE WEEK. THE COOLER TEMPERATURES WILL ALSO HELP INCREASE
RH VALUES.
PRELIMINARY POINT TEMPS/POPS
PDT 88 60 84 58 / 40 40 40 20
ALW 90 66 85 62 / 30 40 40 20
PSC 90 61 87 58 / 30 20 30 10
YKM 91 63 86 57 / 30 40 40 10
HRI 90 63 86 60 / 40 30 40 10
ELN 89 59 81 54 / 40 30 50 20
RDM 86 50 79 49 / 50 50 40 20
LGD 87 56 84 52 / 40 40 50 20
GCD 89 54 82 53 / 50 40 30 10
DLS 89 64 82 60 / 40 50 40 10
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...RED FLAG WARNING FROM 4 PM THIS AFTERNOON TO 3 AM PDT SUNDAY FOR
WAZ690-695.
SHORT TERM...74
LONG TERM....77
AVIATION...90
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