645
FXUS66 KPDT 110604
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1104 PM PDT WED SEP 10 2025
UPDATED AVIATION
VFR CONDITIONS WILL PREVAIL THROUGH THE
FORECAST PERIOD. CIGS WILL HOVER BETWEEN 5-10KFT THROUGH THE
OVERNIGHT HOURS. WINDS WILL BE MOSTLY VARIABLE ACROSS THE SITES
WITH THE ONLY SITE SEEING WINDS ABOVE 10 KTS BEING DLS AS WELL AS
GUSTS NEAR 25KTS. CHANCE OF SHOWERS AND SLIGHT CHANCE OF T-STORMS
BEGINNING AROUND 18Z FOR RDM/BDN/ALW/PDT AND INCREASING TO LIKELY
SHOWERS AND SLIGHT CHANCES OF T-STORMS AFTER 18Z FOR RDM/BDN.
BENNESE/90
PREV DISCUSSION... /ISSUED 148 PM PDT WED SEP 10 2025/
DISCUSSION...AREAS OF SHOWERS AND THUNDERSTORMS EXPECTED TO
DEVELOP LATER IN THE AFTERNOON. CURRENT COVERAGE SHOWS A COUPLE
OF ISOLATED SHOWERS MOVING ACROSS THE MOUNTAINOUS AREAS WITH SOME
POCKETS OF THUNDER EMBEDDED. MAIN THREATS TODAY WILL BE LOCALLY
HEAVY RAIN, GUSTY WINDS, AND SMALL HAIL FROM THE STRONGEST STORMS.
FLASH FLOOD WATCHES (MAINLY FOR SCAR BURNS) ARE IN EFFECT THROUGH
THE NEXT DAY. WPC ISSUED MRGL (AT LEAST 5%) FOR EXCESSIVE
RAINFALL THROUGH FRIDAY MORNING IN PARTS OF THE SOUTHERN BLUES.
AREAS ACROSS THAT REGION IS EXPECTED TO RECEIVE ANYWHERE FROM A
HALF INCH TO AN INCH AND HALF (65-85% CHANCE). THIS WILL CAUSE
SOME CONCERNS FOR DEBRIS FLOW FLOODS GOING THROUGH THE NEXT DAY.
PARTS OF THE SOUTH- CENTRAL WASHINGTON WILL BE ON THE MUCH DRIER
SIDE, RECEIVING UP TO A TENTH OF AN INCH (50-70% CHANCE) GOING
THROUGH THE NEXT DAY. TEMPS WILL STAY COOLER GOING THROUGH THE
WEEK, CONTINUING THE RELIEF FROM THE HEAT WE SAW LAST WEEK.
AS THE TROUGH MOVES ON FROM THE AREA, RAIN COVERAGE WILL DECREASE
HEADING CLOSER TO THE WEEKEND. FRIDAY WILL BE MUCH DRIER, WITH
SHOWERS AND THUNDERSTORMS CONCENTRATED TOWARDS THE EAST MOUNTAINS
AND WALLOWA'S (65-75% CHANCE). WE'LL GET A BREAK FROM THE
CONVECTION ON SATURDAY AS THE TROUGH MOVES OUT AND A SHORT-STAYED
RIDGE MOVES OVER THE PACNW. THIS BREAK WILL PROVE TO BE SHORT
LIVED AS ANOTHER LOW FOLLOWS SHORTLY BEHIND IT. ANOTHER WAVE WILL
PUSH INTO THE REGION SUNDAY, BUT DOES NOT APPEAR TO BE AS ROBUST
AS THE SYSTEM FROM WHAT WE'LL SEE TODAY AND TOMORROW. CLUSTERS ARE
AGREEMENT THAT WE'LL RE-ENTER ANOTHER WET PATTERN DURING THE
BEGINNING OF NEXT WEEK, BUT TO WHAT EXTENT REMAINS TO BE
UNDETERMINED SINCE CONFIDENCE IN GUIDANCE PLUMMETS AFTER SUNDAY.
REGARDLESS, TEMPERATURES WILL REMAIN NEAR TO JUST BELOW NORMAL FOR
THE NEXT SEVERAL DAYS AND WE'LL HAVE TO PAY ATTENTION HOW NEXT
WEEK UNFOLDS.
PRELIMINARY POINT TEMPS/POPS
PDT 58 79 56 80 / 60 60 20 20
ALW 62 81 60 81 / 60 50 30 30
PSC 59 85 57 84 / 30 30 10 10
YKM 58 87 56 85 / 10 20 10 10
HRI 60 83 58 83 / 40 40 10 10
ELN 56 85 54 83 / 10 10 10 10
RDM 48 73 46 78 / 60 50 20 0
LGD 52 75 52 78 / 70 70 40 50
GCD 52 72 50 77 / 80 70 40 30
DLS 61 79 59 80 / 20 20 10 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...FLASH FLOOD WATCH THROUGH THURSDAY EVENING FOR ORZ503-505-506.
FLASH FLOOD WATCH UNTIL 11 PM PDT THIS EVENING FOR ORZ509-511.
WA...NONE.
SHORT TERM...95
LONG TERM....95
AVIATION...90
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