301
FXUS66 KPDT 241125
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
425 AM PDT WED JUN 24 2026
KEY MESSAGES
- FIRE WEATHER WATCHES FOR WA690, WA691, AND OR691 FOR THE
COLUMBIA BASIN & YAKIMA/KITTITAS VALLEY REGION THURSDAY FOR
WIND AND LOW RH.
- HOT, DRY CONDITIONS WITH BREEZY WINDS THROUGH THURSDAY, WITH
STRONGER LOCALLY WINDY CONDITIONS DEVELOPING THURSDAY.
- COOLER, WETTER PATTERN FORECASTED TO DEVELOP FRIDAY AND INTO
THE WEEKEND.
DISCUSSION
CURRENT SATELLITE SHOWS DRY AND MOSTLY CLEAR CONDITIONS
PREVAILING THROUGH THE OVERNIGHT THANKS TO WEAK OVER-HEAD
RIDGING. THE RIDGE PATTERN WILL END BY WEDNESDAY (>90% CHANCE)
AND INTRODUCE A MORE ZONAL FLOW ALOFT, ALLOWING FOR SOME
ISOLATED THUNDERSTORMS TO DEVELOP ACROSS THE WASHINGTON CASCADE
CREST (10-20% CHANCE). DRY AIR WILL STAY IN PLACE THROUGH MUCH
OF THURSDAY WITH BREEZY WINDS DEVELOPING DURING THE DAY, WITH
STRONGER LOCALLY WINDY CONDITIONS DEVELOPING THURSDAY.
CONFIDENCE IS CURRENTLY MEDIUM (40-60% CHANCE) THAT RED FLAG
WARNING CONDITIONS WILL DEVELOP ACROSS THE COLUMBIA BASIN AND
YAKIMA/KITTITAS REGION THURSDAY, THUS A FIRE WEATHER WATCH HAS
BEEN ISSUED FOR WA690, WA691, AND OR691.
FRIDAY WILL SEE A MORE COOLER, WETTER PATTERN DEVELOP FRIDAY AND
THROUGH THE WEEKEND, AS AN AREA OF BROAD TROUGHING DIPS DOWN
FROM THE COAST OF ALASKA AND BRITISH COLOMBIA AND EVENTUALLY
THROUGH THE PACIFIC NORTHWEST (70-90% CHANCE). GUIDANCE IS IN
GOOD AGREEMENT THAT THE PATTERN WILL TURN COOLER AND WETTER BY
FRIDAY (70-90% CHANCE) BRINGING A RELIEF TO THE HEAT AND DRY
AIR. WHILE THE ATTENTION IS CURRENTLY ON WINDS AND LOW RH FOR
FIRE WEATHER, WE WILL HAVE TO PAY CLOSE ATTENTION FOR FIRE
WEATHER FROM ABUNDANT LIGHTNING. AS THE SHORTWAVE/TROUGH SLIDES
TO THE EAST, NBM GUIDANCE ADVERTISES 15-25% CHANCES OF THUNDER
DEVELOPING ACROSS CENTRAL OREGON THROUGH THE BLUE
MOUNTAIN/EASTERN MOUNTAIN REGION. CURRENT NBM GUIDANCE SHOWS
SOME STORMS PRODUCING 0.05" INCHES THROUGH 0.15" IN A SIX-HOUR
PERIOD, WHILE SOME ARE FORECASTING LESS FOR DRY THUNDERSTORMS.
EXACT TIMING/AMPLITUDE OF THE SYSTEM IS A BIT UNKNOWN AND COULD
CHANGE THE OUTCOME OF THE QPF AMOUNTS. WILL KEEP MONITORING IF
RFW WILL BE NEEDED FOR ANY IMPACTED FIRE WEATHER ZONES.
AVIATION /12Z TAFS THROUGH 12Z THURSDAY/
VFR CONDITIONS PREVAIL THROUGH THE PERIOD WITH NO CIG OR VIS
ISSUES EXPECTED. MAIN CONCERN WILL BE BREEZY 20-30 KNOT GUSTS
DEVELOPING IN THE LATE MORNING INTO THE AFTERNOON HOURS FOR DLS,
BDN, AND RDM. WINDS WILL BE ELEVATED THROUGH MUCH OF THE
AFTERNOON, WITH WINDS WEAKENING TO 10-20 KNOT GUSTS BY THE VERY
LATE AFTERNOON INTO THE EARLY EVENING.
PRELIMINARY POINT TEMPS/POPS
PDT 92 60 85 53 / 0 0 0 30
ALW 93 64 87 58 / 0 0 0 20
PSC 96 62 90 56 / 0 0 0 20
YKM 95 61 88 56 / 10 10 0 30
HRI 95 63 88 55 / 0 0 0 20
ELN 91 60 82 51 / 20 10 0 30
RDM 88 49 82 47 / 0 10 0 40
LGD 89 56 85 53 / 0 0 0 40
GCD 91 53 86 50 / 0 0 0 50
DLS 95 63 83 58 / 0 0 0 50
PDT WATCHES/WARNINGS/ADVISORIES
WA...FIRE WEATHER WATCH FROM THURSDAY AFTERNOON THROUGH THURSDAY
EVENING FOR WAZ690-691.
OR...FIRE WEATHER WATCH FROM THURSDAY AFTERNOON THROUGH THURSDAY
EVENING FOR ORZ691.
DISCUSSION...95
AVIATION...95
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