892
FXUS66 KPDT 181706
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1006 AM PDT THU JUN 18 2026
KEY MESSAGES
- VERY WARM TEMPERATURES TO DEVELOP WITH MODERATE LEVEL HEAT
RISK DEVELOPING.
- DRY AIR WITH BREEZY WINDS WILL BRING ELEVATED FIRE WEATHER
CONCERNS OVER THE NEXT SEVERAL DAYS.
DISCUSSION
CURRENT RADAR AND SATELLITE DEPICT DRY AND CLEAR CONDITIONS
ACROSS THE REGION AS A MID-LEVEL RIDGE STILL INFLUENCES THE
PATTERN. A SHORTWAVE WILL ENTER THE REGION FRIDAY NIGHT/SATURDAY
WITH AN AREA OF LOW PRESSURE OVER BRITISH COLUMBIA THAT WILL
DEVELOP LOCALLY BREEZY WINDS. DRY AIR IS EXPECTED TO PREVAIL
WITH MINIMUM RELATIVE HUMIDITIES DROPPING IN THE 10-18% PERCENT
RANGE (ESPECIALLY IN THE LOWER ELEVATED AREAS) THROUGH THE NEXT
SEVERAL DAYS. DRY AIR IN-TANDEM WITH THE EXPECTED BREEZY WINDS
(60-80% CHANCE) WILL BRING ELEVATED FIRE WEATHER CONCERNS IN THE
COLUMBIA BASIN, KITTITAS/YAKIMA REGION, AND AREAS ACROSS
CENTRAL OREGON. TEMPERATURES WILL REACH A PEAK (NOW THROUGH THE
WEEKEND) ON FRIDAY WITH HIGHS GENERALLY IN THE LOW TO MID 90S.
NBM HAS GREAT CONFIDENCE (>90% CHANCE) THAT TEMPERATURES WILL AT
LEAST EXCEED 90 DEGREES ACROSS THE LOWER ELEVATIONS. THIS WILL
BRING A MODERATE HEAT RISK (VALUES OF '2') ACROSS THE COLUMBIA
BASIN, KITTITAS/YAKIMA REGION, WITH ISOLATED AREAS OF MAJOR HEAT
RISK (VALUES OF '3') ACROSS PARTS OF CENTRAL OREGON. WE'LL SEE
A BRIEF RELIEF FROM THE HEAT (>85% CHANCE) THROUGH THE WEEKEND
THANKS TO ON-COMING SHORTWAVE AND THE BROAD AREA OF TROUGH
ACROSS BRITISH COLUMBIA.
GUIDANCE IS IN GOOD AGREEMENT THAT A RIDGE JUST OFFSHORE WILL
MOVE IN-LAND IN THE MONDAY TIMEFRAME, RAISING TEMPERATURES IN A
SECONDARY PEAK IN THE MID TO UPPER 90S AND POSSIBLY IN THE
TRIPLE DIGITS BY TUESDAY (AS ADVERTISED BY THE NBM). CURRENT
GUIDANCE SUGGESTS TUESDAY WILL BE THE HOTTER DAY (40-60% CHANCE)
WITH NBM V5.0 GIVING 60-80% CHANCE OF THE WASHINGTON COLUMBIA
BASIN EXCEEDING 90 DEGREES, WHICH DROPS TO 30-60% IN THE OREGON
COLUMBIA BASIN, KITTITAS/YAKIMA REGION, AND CENTRAL OREGON.
THOSE PERCENT CHANCES JUMP TO 70-90+% IN ALL OF THE PREVIOUSLY
MENTIONED AREAS FOR TUESDAY. TUESDAY ALSO INTRODUCES CHANCES OF
HIGH TEMPERATURES EXCEEDING 100 DEGREES IN THE COLUMBIA BASIN AT
10-20% CHANCES. THIS WILL DEPEND ON THE STRENGTH OF THE RIDGE
WHERE A STRONGER RIDGE WILL RAISE CHANCES OF EXPERIENCING 100
DEGREES EARLY NEXT WEEK WHEREAS CHANCES DROP WITH A WEAKER
RIDGE. REGARDLESS, TEMPERATURES ARE EXPECTED TO GET VERY WARM
AND ANY HEAT RELATED PREPAREDNESS SHOULD BE TAKEN.
AVIATION /18Z TAFS THROUGH 18Z FRIDAY/
VFR CONDITIONS WILL PERSIST THROUGH THE FORECAST PERIOD WITH
LIGHT AND VARIABLE WINDS. CIGS WILL REMAIN SKC TO SCT/BKN.
PRELIMINARY POINT TEMPS/POPS
PDT 86 54 91 58 / 0 0 0 0
ALW 87 59 93 63 / 0 0 0 0
PSC 90 58 95 61 / 0 0 0 0
YKM 89 60 94 59 / 0 0 0 0
HRI 89 57 94 62 / 0 0 0 0
ELN 86 55 91 57 / 0 0 0 0
RDM 86 50 91 51 / 0 0 0 0
LGD 85 52 91 55 / 0 0 0 0
GCD 89 50 95 55 / 0 0 0 0
DLS 91 63 95 62 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...95
AVIATION...90
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