371
FXUS66 KPDT 180518
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1018 PM PDT WED JUN 17 2026
KEY MESSAGES
- VERY WARM TO HOT FRIDAY WITH WIDESPREAD MODERATE (LEVEL 2 OF
4) HEATRISK.
- BREEZY TO WINDY WESTERLY WINDS COUPLED WITH AREAS OF LOW
RELATIVE HUMIDITY LATE FRIDAY AND SATURDAY WILL LEAD TO
INCREASING FIRE WEATHER CONCERNS.
DISCUSSION
THE REGION WILL UNDERGO A MID LEVEL SYNOPTIC TRANSITION AS THE
SHORTWAVE ENERGY OVER NE WA SLIDES FURTHER INLAND AHEAD OF A
DEVELOPING BROADER AND WEAKER GEOPOTENTIAL HEIGHT FIELD FOR
THURSDAY AND FRIDAY. MODELS SHOW A COMPACT LOW SLIDING DOWN THE
BRITISH COLUMBIA COAST BY FRIDAY EVENING THAT WILL ENHANCE WINDS
ACROSS THE INTERIOR NW ON SATURDAY, TRACK IN TO THE SOUTHERN
CANADIAN PRAIRIE PROVINCES ON SUNDAY LEADING TO A RETURN TO
HOTTER TEMPERATURES AND HEATRISK LEVELS INCREASING MONDAY AND
TUESDAY OF NEXT WEEK.
HEATRISK IS FORECAST TO INCREASE TO A LEVEL 2 (ORANGE) ACROSS
THE LOWEST ELEVATIONS OF THE COLUMBIA BASIN AND RIVER GORGE
ZONES MONDAY AND EXPAND ON TUESDAY AFFECTING THE YAKIMA/KITTITAS
VALLEY AND MORE OF THE JOHN DAY BASIN. THIS PERIOD OF INCREASED
HEAT EARLY NEXT WEEK WILL ALSO BRING ABOUT A PERIOD OF
CONVECTIVE MONITORING ACROSS THE BLUE MOUNTAIN ZONE WHICH WOULD
BE A DRY LIGHTNING RISK. ZONES. PROBABILITY OF THUNDER IS NOT
HIGH, BUT AROUND 5% FOR THOSE EASTERN MOUNTAIN ZONES TUESDAY
EVENING.
AVIATION /06Z TAFS THROUGH 06Z FRIDAY/
VFR CONDITIONS ACCOMPANIED BY DIURNALLY AND TERRAIN-DRIVEN
WINDS ARE FORECAST FOR THE NEXT 24 HOURS. FEW-BKN MID/HIGH
CLOUD IS ANTICIPATED TO OVERSPREAD THE REGION FROM SOUTH TO
NORTH OVERNIGHT THROUGH THURSDAY.
FIRE WEATHER
VERY LOW AFTERNOON RELATIVE HUMIDITY IS FORECAST THURSDAY ACROSS
CENTRAL OREGON, ESPECIALLY OR700, LEADING TO SOME FIRE WEATHER
CONCERNS. CONFIDENCE IN MEETING RED FLAG CRITERIA IS LOW-MEDIUM
(20-60 PERCENT) DUE TO UNCERTAINTY IN MEETING THE WIND SPEED
COMPONENT, SO NO WARNING HAS BEEN ISSUED.
VERY LOW CHANCES FOR ISOLATED (5-10 PERCENT) LIGHTNING / DRY
THUNDERSTORMS OVER PORTIONS OF CENTRAL AND EASTERN OREGON
FRIDAY AFTERNOON AND EVENING, MAINLY ACROSS THE SOUTHERN
PARTS OF OR700, OR697, AND OR698, AND OR705.
BREEZY TO WINDY WESTERLY WINDS COUPLED WITH AREAS OF LOW RELATIVE
HUMIDITY LATE FRIDAY AND SATURDAY WILL LEAD TO INCREASING FIRE
WEATHER CONCERNS. CONFIDENCE IS LOW-MEDIUM (20-50 PERCENT) IN
MEETING RED FLAG CRITERIA FRIDAY WITH MEDIUM-HIGH (40-70
PERCENT) CONFIDENCE SATURDAY.
PRELIMINARY POINT TEMPS/POPS
PDT 50 86 55 92 / 0 0 0 0
ALW 55 87 59 93 / 0 0 0 0
PSC 54 90 58 95 / 0 0 0 0
YKM 53 89 60 95 / 0 0 0 0
HRI 53 89 58 94 / 0 0 0 0
ELN 50 86 56 91 / 0 0 0 0
RDM 45 86 49 91 / 0 0 0 0
LGD 47 85 52 91 / 0 0 0 0
GCD 46 89 50 94 / 0 0 0 0
DLS 56 91 64 95 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...86
FIRE WEATHER...71/86
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