797
FXUS66 KPDT 192324
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
424 PM PDT FRI JUN 19 2026
KEY MESSAGES
- CRITICAL FIRE WEATHER SATURDAY
- HEAT RISK INCREASING EARLY NEXT WEEK
DISCUSSION
A COMPACT UPPER LOW OVER SOUTHERN BRITISH COLUMBIA WILL SWING
SOUTHEAST TODAY AND TONIGHT CONTINUING TO CARVE OUT AN UPPER
TROUGH ACROSS THE INLAND NORTHWEST THROUGH THE END OF THE
WEEKEND. THIS WILL LEAVE THE PDT CWA UNDER NORTHWEST FLOW
ALOFT/CONTINUED SUBSIDENT AND INCREASINGLY BREEZY BOUNDARY LAYER
WINDS IN THE HIGHER ELEVATION ZONES. SOME LOWER ELEVATION ZONES
WILL NOT SEE AS MUCH WIND HOWEVER HEAT WILL RAMP UP PEAKING ON
TUESDAY AND WEDNESDAY WHERE HIGHS IN THE LOWER COLUMBIA BASIN
WILL REACH THE 90S BROADLY AND THE UPPER 90S IN THE TRI-CITIES
WITH OVERNIGHT LOWS REMAINING WARM IN THE 60S. THIS EXTENDED
PERIOD OF HOT TEMPERATURES CONTINUES INTO THE MIDDLE PART OF THE
WEEK BEFORE MODELS (NBM MEMBERS) INDICATE THE FIRST SIGNIFICANT
RESPITE IN HIGHS MEAN REVERTING BACK INTO THE 80S FOR THE LOWER
ELEVATIONS ON FRIDAY. HEATRISK FOR THE EASTERN COLUMBIA RIVER
GORGE PUSHES INTO THE LEVEL 3 CATEGORY MONDAY NIGHT AND TUESDAY.
AN EXTREME HEAT WATCH HAS BEEN HOISTED FOR THIS PERIOD, WHICH
LOOKS LIKE AT LEAST HEAT ADVISORIES WILL BE NEEDED IN MORE
WARNINGS AND SUBSEQUENT SHIFT WILL EVALUATE THE NEED FARTHER OUT
EXTENDING INTO WEDNESDAY.
AVIATION /00Z TAFS THROUGH 00Z SUNDAY/
VFR CONDITIONS PERSIST THROUGH THE FORECAST PERIOD. WINDS ARE
UNDER 10 KTS AND VARIABLE ACROSS THE TAF SITES YKM/ALW/PSC WITH
YKM/ALW SEEING AN INCREASE TO NEAR 11 KTS BETWEEN 04-07Z
RESPECTIVELY. DLS/PDT/RDM/BDN ARE ALL SEEING WINDS BETWEEN 10-15
KTS WITH GUSTS BETWEEN 20-26 KTS. A BRIEF DECREASE IN WINDS FOR
RDM/BDN BETWEEN03-20Z BEFORE RAMPING RIGHT BACK UP TO BREEZY
WINDS AGAIN. CIGS WILL REMAIN 25KFT THROUGH THE PERIOD.
FIRE WEATHER
LATE AFTERNOON SATURDAY INTO EARLY SATURDAY EVENING WILL
PRESENT SOME CRITICAL FIRE WEATHER RISKS ACROSS OR700 AND
OR/WA691 AND WA690, DUE TO LOW RELATIVE HUMIDITY AND BREEZY TO
WINDY CONDITIONS. THE PRIMARY TIMEFRAME WILL BE BETWEEN 3 AND 8
PM WHERE RED FLAG WARNINGS HAVE BEEN HOISTED. MUCH LOWER WINDS
ARE FORECAST FOR SUNDAY LIMITING THE NEED FOR ANY ADDITIONAL
FIRE WEATHER WATCHES IN THE SHORT TERM. WIND COMPONENT OF THE
RED FLAG CRITERIA UPTICKS AGAIN WEDNESDAY INTO THURSDAY WHERE
ADDITIONAL HEADLINES FOR FIRE RISK MIGHT BE NEEDED AS THE
OVERALL HOT AND DRY PATTERN CONTINUES DRIVING DOWN RELATIVE
HUMIDITY DAILY.
PRELIMINARY POINT TEMPS/POPS
PDT 59 84 51 84 / 0 0 0 0
ALW 64 86 56 85 / 0 0 0 0
PSC 62 90 55 88 / 0 0 0 0
YKM 58 89 54 88 / 0 0 0 0
HRI 62 86 54 87 / 0 0 0 0
ELN 57 81 51 84 / 0 0 0 0
RDM 51 83 41 83 / 0 0 0 0
LGD 55 83 47 81 / 0 0 0 0
GCD 54 85 44 84 / 0 10 0 0
DLS 62 81 56 89 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...RED FLAG WARNING FROM 3 PM TO 8 PM PDT SATURDAY FOR WAZ691.
EXTREME HEAT WATCH FROM MONDAY MORNING THROUGH TUESDAY EVENING
FOR WAZ024.
RED FLAG WARNING FROM 4 PM TO 8 PM PDT SATURDAY FOR WAZ690.
OR...RED FLAG WARNING FROM 3 PM TO 8 PM PDT SATURDAY FOR ORZ691-700.
EXTREME HEAT WATCH FROM MONDAY MORNING THROUGH TUESDAY EVENING
FOR ORZ041.
DISCUSSION...71
AVIATION...90
FIRE WEATHER...71
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