528
FXUS66 KPDT 071119
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
419 AM PDT THU MAY 7 2026
KEY MESSAGES
- ABOVE-NORMAL TEMPERATURES AND MOSTLY DRY CONDITIONS THROUGH
THIS WEEK INTO NEXT WEEK
- PERIODS OF LOW RELATIVE HUMIDITY (10-20 PERCENT) COUPLED WITH
BREEZY TO WINDY WESTERLY WINDS THURSDAY AND FRIDAY THROUGH
THE CASCADE GAPS AND ACROSS THE COLUMBIA BASIN AND BLUE
MOUNTAIN FOOTHILLS
DISCUSSION
BREEZY CONDITIONS ARE FORECAST TO CONTINUE THURSDAY AS A
SHORTWAVE EXITS TO THE EAST OVER THE ROCKIES AND UPPER-LEVEL
RIDGING REBUILDS OVER THE PACIFIC NORTHWEST. RELATIVE TO
WEDNESDAY, A DRIER AIR MASS (ENSEMBLE-ADVERTISED
PWATS OF 0.25-0.50") IS FORECAST TO BE PRESENT IN THE
WAKE OF THE SHORTWAVE, AND AREAS OF LOW RELATIVE HUMIDITY (10-20
PERCENT) ARE FORECAST. FUELS ARE NOT YET READY FOR RED FLAG
WARNINGS, SO NO FIRE WEATHER HEADLINES HAVE BEEN ISSUED.
BY FRIDAY, ENSEMBLE MEAN 500-HPA HEIGHTS AND VORTICITY SHOW
ANOTHER SHORTWAVE FROM THE PACIFIC TRACKING ACROSS THE PACIFIC
NORTHWEST FROM LATE MORNING TO THE EVENING. CONFIDENCE IS VERY
HIGH (90 PERCENT) IN ANOTHER ROUND OF WIDESPREAD BREEZY TO WINDY
WESTERLY WINDS THROUGH THE CASCADE GAPS AND ACROSS THE COLUMBIA
BASIN AND BLUE MOUNTAIN FOOTHILLS. NBM PROBABILITIES OF
REACHING OR EXCEEDING ADVISORY-LEVEL WIND GUSTS ARE MEDIUM-HIGH
(40-80 PERCENT) FOR WIND-PRONE AREAS WITHIN THE REGION OUTLINED
ABOVE. SIMILAR TO TODAY, THE DRY AIR MASS COUPLED WITH
SUFFICIENT DOWNWARD MIXING DURING THE DAYTIME SHOULD FACILITATE
AREAS OF LOW RELATIVE HUMIDITY (10-20 PERCENT).
TAKING A GLANCE AT THE WEEKEND INTO THE MIDDLE OF NEXT WEEK,
ENSEMBLE NWP GUIDANCE SHOWS LITTLE TO NO SIGNAL FOR ORGANIZED
PRECIPITATION THROUGH WEDNESDAY AS UPPER-LEVEL RIDGING REMAINS
THE FAVORED SCENARIO FOR THE BULK OF THE WEST. BREEZY WESTERLY
WINDS ARE LIKELY (70 PERCENT CONFIDENCE) SUNDAY AS THE RIDGE
AXIS SHIFTS INLAND AND ENSEMBLE GUIDANCE SHOWS POTENTIAL FOR YET
ANOTHER SHORTWAVE TO RIDE OVER THE TOP OF THE RIDGE. BY
TUESDAY, PATTERN DETAILS ARE A BIT UNCLEAR BASED ON SCENARIOS
PRESENTED IN ENSEMBLE CLUSTERS, BUT ABOVE-NORMAL HEIGHTS ARE
STRONGLY FAVORED (AT LEAST 90 PERCENT OF ENSEMBLE MEMBERS)
THROUGH WEDNESDAY.
TO BRIEFLY TOUCH ON FORECAST TEMPERATURES, FOR MOST OF OUR
POPULATION CENTERS HIGH TEMPERATURES IN THE UPPER 70S TO UPPER
80S COUPLED WITH LOWS IN THE UPPER 40S TO LOWER 60S WILL
PRESENT PREDOMINANTLY MINOR (LEVEL 1 OF 4) HEATRISK. THIS LEVEL
OF HEAT PRIMARILY AFFECTS THOSE WHO ARE EXTREMELY SENSITIVE TO
HEAT AND WITHOUT COOLING/HYDRATION.
AVIATION /12Z TAFS THROUGH 12Z FRIDAY/
VFR CONDITIONS WITH PERIODS OF BREEZY WINDS AND MID- TO HIGH-
LEVEL CLOUDS ARE FORECAST FOR THE NEXT 24 HOURS.
FIRE WEATHER
AREAS OF LOW (10-20 PERCENT) RELATIVE HUMIDITY ARE FORECAST TO
ACCOMPANY BREEZY (THURSDAY) TO WINDY (FRIDAY) WESTERLY WINDS
ACROSS THE COLUMBIA BASIN AND SURROUNDING LOWLANDS. POOR TO
MODERATE OVERNIGHT RELATIVE HUMIDITY RECOVERY IS ANTICIPATED
THURSDAY NIGHT FOR RIDGETOP, MID-SLOPE, AND SOME BASIN
LOCATIONS. ABOVE-NORMAL TEMPERATURES ARE FORECAST FOR THE NEXT
WEEK, AND SIGNIFICANT PRECIPITATION IS UNLIKELY (90 PERCENT
CONFIDENCE).
HYDROLOGY
THE NACHES RIVER NEAR NACHES IS FORECAST TO REMAIN ABOVE ACTION
STAGE FOR THE NEXT WEEK. ABOVE-NORMAL TEMPERATURES ARE FORECAST
TO CONTINUE, AND SIGNIFICANT PRECIPITATION IS UNLIKELY (90
PERCENT CONFIDENCE) FOR THE NEXT WEEK.
PRELIMINARY POINT TEMPS/POPS
PDT 76 50 75 47 / 0 0 0 0
ALW 76 53 75 50 / 0 0 0 0
PSC 82 55 82 50 / 0 0 0 0
YKM 83 51 79 46 / 0 0 0 0
HRI 79 54 77 49 / 0 0 0 0
ELN 77 48 70 43 / 0 0 0 0
RDM 80 42 76 39 / 0 0 0 0
LGD 75 43 74 42 / 0 0 0 0
GCD 78 44 76 41 / 0 0 0 0
DLS 79 50 75 49 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...86
AVIATION...86
FIRE WEATHER...86
HYDROLOGY...86
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page