179
FXUS66 KPDT 191709
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1009 AM PDT FRI JUN 19 2026
KEY MESSAGES
- ELEVATED FIRE WEATHER CONCERNS CONTINUE THROUGH THE WEEKEND.
FIRE WEATHER WATCHES ISSUED FOR THE COLUMBIA BASIN THROUGH
CENTRAL OREGON
- HOT TODAY WITH MODERATE HEAT RISK, BUT WILL BE COOLER THROUGH
THE WEEKEND. TEMPERATURES REMAIN VERY WARM IN THE UPPER 80S
SATURDAY AND SUNDAY.
- MODERATE HEAT RISK RETURNS MONDAY (60-80% CHANCE).
DISCUSSION
NOW THROUGH SUNDAY: SATELLITE CURRENTLY DEPICTS CLEAR SKIES
WITH DRY CONDITIONS THROUGH THE AREA THATS IN RESPONSE TO A
RIDGE SITUATED OVER THE REGION. EURO AND GFS DETERMINISTIC IN
THE SHORT-TERM AGREE THAT THE RIDGE WILL PUSH OFF TO THE EAST
AND A SHORTWAVE OVER BRITISH COLUMBIA AND ALBERTA WILL CLIP
THROUGH THE PACNW AND BRING TEMPORARY RELIEF FROM THE HEAT OVER
THE WEEKEND (>85% CHANCE). HIGHS WILL DROP FROM THE EXPECTED MID
TO UPPER 90S IN THE LOWER ELEVATED AREAS ON FRIDAY TO THE LOW
TO MID 80S SATURDAY AND SUNDAY, THUS DROPPING THE HEAT RISK FROM
A VALUE OF '2' TO A '1' IN MOST PLACES. WITH THE ONCOMING
SHORTWAVE, BREEZY TO LOCALLY WINDS WILL DEVELOP WITH THE
STRONGEST WINDS EXPECTED TO OCCUR SATURDAY. CURRENT NBM GUIDANCE
ADVERTISED MEDIUM-TO-HIGH CHANCES OF THE KITTITAS VALLEY
(60-80% CHANCE) AND GAPS OF THE CASCADE MOUNTAINS NEAR THE
DALLES (40-60% CHANCE) REACHING OR EXCEEDING 40 MPH GUSTS.
CURRENT CONFIDENCE IS LOW-TO-MEDIUM (20-40%) THAT THESE REGIONS
WILL EXCEED WIND ADVISORY CRITERIA AND WILL NEED ADDITIONAL
MONITORING TOMORROW IF HIGHLIGHTS ARE NECESSARY. DRY AIR IS
EXPECTED TO LINGER WITH MINIMUM RELATIVE HUMIDITIES REACHING
THE TEENS TO LOW 20S PERCENT RANGE (POSSIBLY REACHING THE SINGLE
DIGITS IN PARTS OF CENTRAL OREGON AND SOUTHERN BLUE MOUNTAINS).
WITH THE ON-SET OF BREEZY WINDS MENTIONED EARLIER, ELEVATED
FIRE WEATHER CONCERNS WILL BE PRESENT WITH THE ADDITION OF A
FIRE WEATHER WATCH IN-EFFECT SATURDAY FOR WA690 (KITTITAS/YAKIMA
VALLEY), WA691 (WASHINGTON COLUMBIA BASIN), OR691 (OREGON
COLUMBIA BASIN), AND OR700 (SOUTHERN CENTRAL MOUNTAINS).
MONDAY THROUGH WEDNESDAY: GUIDANCE IS STILL IN GOOD AGREEMENT
THAT A SECONDARY RIDGE WILL PUSH ON-SHORE EARLY NEXT-WEEK, RE-
INTRODUCING SUBSIDENCE INTO THE REGION. THIS WILL BRING ANOTHER
WARM TREND THROUGH AT LEAST MID NEXT-WEEK (60-80% CHANCE) AND
BRING A SECONDARY PEAK IN TEMPERATURES AND HEAT RISK EVENTS.
CURRENT NBM GUIDANCE JUMPS THE CHANCES OF TEMPERATURES EXCEEDING
90 DEGREES FROM AROUND 0-20% SUNDAY TO 30-50% MONDAY IN MOST OF
THE LOWER ELEVATED AREAS. CHANCES OF GREATER THAN 90 DEGREE
TEMPERATURES JUMPS TO 90%+ THROUGHOUT THE LOWER ELEVATIONS ON
TUESDAY AND WEDNESDAY WITH MODERATE HEAT RISKS (VALUE OF '2')
ADVERTISED WITH ISOLATED AREAS OF A MAJOR HEAT RISK (VALUE OF
'3') IN THE DALLES ON TUESDAY ONLY. CHANCES OF TEMPERATURES
EXCEEDING 100 DEGREES STILL DOESN'T LOOK IMPRESSIVE WITH CHANCES
RANGING FROM 0-20%. IF THE ONCOMING SECONDARY RIDGE TURNS OUT
TO BE STRONGER THAN FORECAST, IT IS POSSIBLE TO SEE ISOLATED TO
SCATTERED AREAS SEEING 100+ DEGREE HIGH TEMPERATURES (WITH IT
BEING DAY 4 AND 5, THERE IS TIME TO MONITOR FOR TRENDS).
AVIATION /18Z TAFS THROUGH 18Z SATURDAY/
VFR CONDITIONS PERSIST THROUGH THE FORECAST PERIOD. WINDS ARE
UNDER 10 KTS AND VARIABLE ACROSS THE TAF SITES CURRENTLY BUT ARE
EXPECTED TO INCREASE AT AFTER 05Z TO 9-10 KTS THEN ANOTHER
INCREASE AFTER 15Z. PDT WILL SEE 15G22 AFTER 15Z, RDM/BDN WILL
SEE 12-15G20-25KTS AFTER 22Z AND DLS WITH 15G25 KTS AFTER 00Z.
ELSEWHERE WILL REMAIN UNDER 12 KTS. CIGS WILL BE SCT/BKN.
PRELIMINARY POINT TEMPS/POPS
PDT 91 59 84 51 / 0 0 0 0
ALW 93 64 86 56 / 0 0 0 0
PSC 95 62 90 55 / 0 0 0 0
YKM 94 58 89 54 / 0 0 0 0
HRI 94 62 86 54 / 0 0 0 0
ELN 90 57 81 51 / 0 0 0 0
RDM 91 51 83 41 / 0 0 0 0
LGD 91 55 83 47 / 0 0 0 0
GCD 94 54 85 44 / 0 0 10 0
DLS 95 62 81 56 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...FIRE WEATHER WATCH FROM SATURDAY MORNING THROUGH SATURDAY
EVENING FOR WAZ690-691.
EXTREME HEAT WATCH FROM MONDAY MORNING THROUGH TUESDAY EVENING
FOR WAZ024.
OR...FIRE WEATHER WATCH FROM SATURDAY MORNING THROUGH SATURDAY
EVENING FOR ORZ691-700.
EXTREME HEAT WATCH FROM MONDAY MORNING THROUGH TUESDAY EVENING
FOR ORZ041.
DISCUSSION...95
AVIATION...90
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