759
FXUS66 KPDT 151721
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1021 AM PDT MON JUN 15 2026
KEY MESSAGES
1.DRY AND WARM THROUGH THE WEEKEND BECOMING HOT MONDAY
*HEAT ADVISORIES ISSUED*
2. BREEZY TO WINDY ACROSS THE REGION THROUGH WEDNESDAY
3. ISOLATED FIRE WEATHER CONCERNS TODAY BECOMING WIDESPREAD
ACROSS THE COLUMBIA BASIN TUESDAY
*RED FLAG WARNINGS ISSUED*
UPDATE
THE FIRE WEATHER WATCHES HAVE BEEN UPGRADED TO RED FLAG WARNINGS
FOR FIRE ZONES WA691/OR691 VALID TUESDAY 10 AM THROUGH 11 PM.
COMBINED PROBABILITY FOR LOW RH AND WIND OF 25% AND 30 MPH
GUSTS ARE IN THE 80 TO 90TH PERCENTILE, RESULTING IN HIGH
CONFIDENCE IN THE RISK FOR RAPID FIRE SPREADING OF ANY STARTS.
DISCUSSION
CURRENT SATELLITE SHOWS MOSTLY CLEAR SKIES OVER THE REGION WITH SOME
LINGERING HIGH CLOUDS OVER KITTITAS AND YAKIMA DOWN THROUGH CENTRAL
OR. THE CLOUD COVERAGE WILL ASSIST WITH KEEPING THE OVERNIGHT LOWS A
BIT ON THE WARMER SIDE THROUGH THE MORNING. WITH OVERNIGHT LOWS
PROVIDING LITTLE RELIEF FROM THE WARMTH OVERNIGHT AND HIGH
TEMPERATURES TOMORROW REACHING WELL INTO THE 90 DEGREE RANGE THROUGH
MANY AREA, THE HEATRISK MODELS SHOW PORTIONS OF CENTRAL OR, THE
COLUMBIA RIVER GORGE OF WA & OR AS WELL AS THE KITTITAS AND YAKIMA
VALLEYS TO BE IN MODERATE TO HIGH RISK MONDAY SO AN HEAT ADVISORY HAS
BEEN ISSUED BETWEEN 10 AM TO 10 PM. CONFIDENCE IN THE TEMPERATURES
NEARING THE LOW TO MID 90S IN THESE AREAS IS >90%.
MODELS SHOW AN UPPER LEVEL SHORTWAVE WILL MAKES ITS WAY ACROSS THE
TOP OF THE RIDGE MONDAY AFTERNOON. THIS WILL CAUSE A SLIGHT INCREASE
IN THE WINDS TODAY THROUGH THE GAPS. WINDS TODAY WILL BE BREEZY WITH
SUSTAINED WINDS OF 10-15 MPH AND GUSTS TO 25 WITH 50-70% OF THE NBM
AND HREF RAW ENSEMBLES IN AGREEMENT. BY TUESDAY MODELS SHOW THE
UPPER LEVEL SHORTWAVE TO DEEPEN ACROSS THE LOW CAUSING THE PRESSURE
GRADIENT ACROSS THE CASCADES TO TIGHTEN EVEN MORE. WINDS TUESDAY
WILL BE SUSTAINED AT 15-25 MPH WITH GUSTS NEARING 40 MPH WITH 60-90%
OF THE RAW ENSEMBLES IN AGREEMENT. WINDS WILL SETTLE SLIGHTLY
WEDNESDAY TO A MORE NORMAL DIURNAL FLOW WITH SUSTAINED WINDS
SETTLING BACK TO 10-15 MP WITH GUSTS OF 20-25 MPH.
WITH THE WINDS ON TUESDAY BEING ELEVATED AND THE AREA BEING UNDER
DRY AND WARM CONDITIONS, THERE IS ELEVATED FIRE WEATHER ACROSS
PORTIONS OF THE COLUMBIA BASIN. A FIRE WEATHER WATCH IS IN EFFECT
FOR BOTH THE OR & WA BASIN TUESDAY MORNING THROUGH TUESDAY EVENING
FOR WINDS AND RHS. WSUP VIEWER FOR 15 MPH WINDS AND 20% RH ARE WELL
IN THE 60-90% RANGE ON TUESDAY.
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
VFR CONDITIONS EXPECTED THROUGH THE FORECAST PERIOD.
WINDS WILL BE LIGHT AND VARIABLE ACROSS ALL TAF SITES TODAY WITH THE
EXCEPTION OF DLS WHERE WINDS WILL DEVELOP AND REACH 15-20 KTS GUSTS
BY THE AFTERNOON. WILDFIRE SMOKE WILL ALSO BE A POSSIBLE ISSUE FOR
DLS THROUGH THE PERIOD UNTIL THE WIND SHIFTS CAUSING HAZE TO FILTER
TOWARDS PDT. THE HAZE IS NOT EXPECTED TO BRING FLIGHT CATEGORIES
DOWN AT THIS MOMENT AND WILL CONTINUE TO MONITOR.
FIRE WEATHER
THE FIRE WEATHER WATCHES HAVE BEEN UPGRADED TO RED FLAG
WARNINGS FOR THE FIRE ZONES WA691/OR691 VALID TUESDAY 10 AM
THROUGH 11 PM. COMBINED PROBABILITIES FOR LOW RH AND WIND OF
25% AND 30 MPH GUSTS ARE IN THE 80 TO 90TH PERCENTILE, RESULTING
IN HIGH CONFIDENCE IN THE RISK FOR RAPID FIRE SPREADING OF ANY
STARTS TUESDAY AFTERNOON AND EVENING.
PRELIMINARY POINT TEMPS/POPS
PDT 92 62 88 51 / 0 0 0 0
ALW 92 66 90 55 / 0 0 0 0
PSC 96 64 94 55 / 0 0 0 0
YKM 99 62 90 54 / 0 0 0 0
HRI 95 67 90 55 / 0 0 0 0
ELN 95 62 81 52 / 0 0 0 0
RDM 91 54 89 47 / 0 0 0 0
LGD 88 55 88 49 / 0 0 0 0
GCD 90 53 91 48 / 0 0 0 0
DLS 99 69 86 57 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...HEAT ADVISORY UNTIL 10 PM PDT THIS EVENING FOR WAZ024-026-027.
RED FLAG WARNING FROM 10 AM TO 11 PM PDT TUESDAY FOR WAZ691.
OR...HEAT ADVISORY UNTIL 10 PM PDT THIS EVENING FOR ORZ041-511.
RED FLAG WARNING FROM 10 AM TO 11 PM PDT TUESDAY FOR ORZ691.
UPDATE...71
DISCUSSION...90
AVIATION...90
FIRE WEATHER...71
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