739
FXUS66 KPDT 092343
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
443 PM PDT MON JUN 9 2025
UPDATE
CLEAR SKIES THROUGHOUT THE REGION. HIT TRIPLE DIGITS
ACROSS MANY PARTS OF THE BASIN AND THE KITTITAS VALLEY. SAW
ADVISORY CRITERIA THAT WOULD WARRANT ADDITIONAL HIGHLIGHTS IN THE
SOUTHERN FOOTHILLS OF THE BLUES AND NORTH-CENTRAL OREGON THAT WILL
REMAIN IN EFFECT UNTIL 9 PM TUESDAY.
UPDATED AVIATION...00Z TAFS
CONDITIONS ARE EXPECTED TO REMAIN
IN VFR THROUGHOUT THE PERIOD. WINDS ARE BREEZY TO WINDY BUT WILL
GENERALLY CALM DOWN IN THE LATE EVENING INTO THE OVERNIGHT.
AFTERWARDS, SITES LIKE DLS AND PDT WILL GRADUALLY SEE THE WINDS
PICK UP TO 25 KNOTS HEADING INTO THE LATE MORNING/EARLY AFTERNOON
HOURS. DRY CONDITIONS PERSIST, BUT BDN AND RDM ARE CURRENTLY
FORECASTING A SLIGHT CHANCE (15-25%) FOR A PASSING THUNDERSTORM.
VIS AND CIGS COULD DROP TO MVFR DEPENDING HOW HEAVY THE
THUNDERSTORMS BECOME.
PREV DISCUSSION
/ISSUED 143 PM PDT MON JUN 9 2025/
SHORT TERM...
TONIGHT THROUGH WEDNESDAY NIGHT...
STRONG HIGH PRESSURE REMAINS OVER THE PACIFIC NORTHWEST. THIS HIGH
WILL KEEP VERY HOT TEMPERATURES AND MODERATE TO HIGH HEATRISK
ACROSS MUCH OF THE REGION TODAY. THE RIDGE WILL MOVE A BIT
EASTWARD ON TUESDAY AND GRADUALLY BREAK DOWN AND WE WILL BE IN A
MORE SOUTHWESTERLY FLOW BY LATE AFTERNOON EARLY EVENING. STILL, IT
IS EXPECTED TO BE ANOTHER HOT DAY, JUST NOT AS HOT AS TODAY.
SOUTHWESTERLY FLOW WILL CONTINUE INTO WEDNESDAY.
AS THE RIDGE MOVES EASTWARD ON TUESDAY INTO WEDNESDAY, THERE WILL
BE A SLIGHT (15-20%) CHANCE OF SHOWERS AND THUNDERSTORMS ACROSS
CENTRAL OREGON AND THE OCHOCO-JOHN DAY HIGHLANDS TUESDAY AND THEN
MORE ACROSS EASTERN OREGON ON WEDNESDAY. SOME OF THESE
THUNDERSTORMS WILL BE DRY, THOUGH THERE COULD BE SOME THAT PUT
DOWN SOME LIGHT (A FEW HUNDREDTHS) AMOUNTS OF RAIN.
THERE ARE 500 TO 1000J/KG OF CAPE IN SPOTS BOTH TUESDAY AFTERNOON
AND WEDNESDAY AFTERNOON BUT ALSO SOME DECENT CIN.
WINDS WILL INCREASE BOTH THIS AFTERNOON AND TUESDAY AFTERNOON,
WITH TUESDAY HAVING THE STRONGER WINDS. THE COMBINATION OF THE
STRONG WINDS AND LOW RELATIVE HUMIDITIES WILL YIELD CRITICAL FIRE
WEATHER CONDITIONS AND A RED FLAG WARNING REMAINS IN EFFECT.
THROUGH TUESDAY.
HIGH TEMPERATURE WILL REMAIN ABOVE NORMAL THROUGH THE PERIOD
THOUGH THEY WILL SLOWLY DECREASE. HIGHS ON TUESDAY WILL BE IN THE
90S TO AROUND 100 DEGREES IN THE COLUMBIA BASIN. THESE
TEMPERATURES ARE ABOUT 20 DEGREES ABOVE NORMAL. HIGHS ON WEDNESDAY
WILL BE ABOUT 7 TO 10 DEGREES COOLER THAN TUESDAY, AND RANGE
MAINLY IN THE 80S TO LOWER 90S. THESE HIGHS ARE STILL ABOUT 10
DEGREES ABOVE NORMAL. HEATRISK WILL REMAIN MODERATE ACROSS THE
COLUMBIA BASIN, YAKIMA VALLEY AND BLUE MOUNTAIN FOOTHILLS.
THE ECMWF EFI HAS ANOMALIES OF 0.9 TO 0.95 FOR HIGH TEMPERATURES
ACROSS THE COLUMBIA AND FOOTHILLS OF THE BLUE MOUNTAINS ON
TUESDAY AND 0.8 TO 0.9 FOR LOWS. EFI ALSO HAS 0.7 TO 0.8 FOR HIGHS
ON WEDNESDAY.
LONG TERM...
THURSDAY THROUGH MONDAY...DRY SOUTHWESTERLY FLOW WILL CONTINUE
THROUGH THE MIDWEEK INTO THE WEEKEND. A WEAK TROUGH MAY BRING SOME
SHOWERS BY MONDAY, BUT THAT IS STILL A WEEK AWAY AND IS LIKELY THE
NEXT CHANCE OF ANY PRECIPITATION AFTER THE ISOLATED THUNDERSTORMS
TOMORROW AND WEDNESDAY. THE COOLER TEMPERATURES WILL BRING AT
LEAST SOME INCREASE IN RH AND HELP ALLEVIATE FIRE WEATHER
CONCERNS. HIGH TEMPERATURES WILL BE CLOSE TO NORMAL FRIDAY THROUGH
THE WEEKEND, AND THERE WILL BE DIURNAL BREEZES EACH DAY.
PRELIMINARY POINT TEMPS/POPS
PDT 64 97 62 91 / 0 0 10 10
ALW 69 96 66 89 / 0 0 0 10
PSC 64 99 61 94 / 0 0 0 0
YKM 64 99 62 94 / 0 0 0 0
HRI 64 100 62 93 / 0 0 0 0
ELN 64 95 61 89 / 0 0 0 0
RDM 56 94 50 86 / 0 10 10 0
LGD 61 92 60 85 / 0 0 20 20
GCD 59 93 58 87 / 0 10 30 30
DLS 64 94 62 85 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...HEAT ADVISORY UNTIL 9 PM PDT TUESDAY FOR ORZ041-044-507.
HEAT ADVISORY UNTIL 9 PM PDT TUESDAY FOR ORZ508-510.
WA...HEAT ADVISORY UNTIL 9 PM PDT TUESDAY FOR WAZ024-026>029.
RED FLAG WARNING UNTIL 8 PM PDT TUESDAY FOR WAZ690-691.
UPDATE...95
SHORT TERM...77
LONG TERM....77
AVIATION...95
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