155
AUUS46 KPDT 301225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT MAY 30 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 12-24 MPH. W 11-16 MPH.
TRANSPORT WINDS SW 12-23 MPH. W 11-16 MPH.
MIXING HEIGHT 2000 FT MSL. 7500 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR SUN MAY 31 FAIR.
OUTLOOK FOR MON JUN 1 FAIR.
VENTILATION INDEX (CATEGORY) 285 (POOR). 698 (GOOD).
OUTLOOK FOR SUN MAY 31 483 (FAIR).
OUTLOOK FOR MON JUN 1 363 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 5-9 MPH. NW 5-11 MPH.
TRANSPORT WINDS W 6-10 MPH. NW 7-13 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SUN MAY 31 FAIR.
OUTLOOK FOR MON JUN 1 FAIR.
VENTILATION INDEX (CATEGORY) 141 (POOR). 503 (FAIR).
OUTLOOK FOR SUN MAY 31 351 (FAIR).
OUTLOOK FOR MON JUN 1 348 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 2-5 MPH. NW 11-16 MPH.
TRANSPORT WINDS W 6-10 MPH. NW 12-17 MPH.
MIXING HEIGHT 4000 FT MSL. 8000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SUN MAY 31 GOOD.
OUTLOOK FOR MON JUN 1 GOOD.
VENTILATION INDEX (CATEGORY) 151 (POOR). 524 (FAIR).
OUTLOOK FOR SUN MAY 31 483 (FAIR).
OUTLOOK FOR MON JUN 1 393 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 7-21 MPH. W 11-16 MPH.
TRANSPORT WINDS SW 11-20 MPH. W 12-16 MPH.
MIXING HEIGHT 2000 FT MSL. 6500 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR SUN MAY 31 FAIR.
OUTLOOK FOR MON JUN 1 FAIR.
VENTILATION INDEX (CATEGORY) 251 (POOR). 628 (GOOD).
OUTLOOK FOR SUN MAY 31 441 (FAIR).
OUTLOOK FOR MON JUN 1 417 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 655 (GOOD)
ELLENSBURG 1040 (GOOD)
GOLDENDALE 892 (GOOD)
TRI-CITIES 543 (FAIR)
WALLA WALLA 546 (FAIR)
YAKIMA 737 (GOOD)
BEND 411 (FAIR)
PRINEVILLE 436 (FAIR)
ENTERPRISE 323 (FAIR)
HERMISTON 637 (GOOD)
JOHN DAY 574 (FAIR)
LA GRANDE 563 (FAIR)
MADRAS 437 (FAIR)
MEACHAM 538 (FAIR)
PENDLETON 756 (GOOD)
REDMOND 439 (FAIR)
SENECA 570 (FAIR)
THE DALLES 946 (GOOD)
METEOROLOGICAL INFORMATION PROVIDED IN THIS PRODUCT REPRESENTS ONLY
SOME OF THE FACTORS USED IN BURN DECISIONS. BURN DECISIONS ARE
OUTSIDE THE PURVIEW OF THE NATIONAL WEATHER SERVICE.
THE VENTILATION INDEX IS A TOOL TO ASSIST SMOKE MANAGEMENT
AGENCIES IN DETERMINING BURN OR NO BURN DECISIONS. A VENTILATION
INDEX GRAPHIC IS ON THE PENDLETON WEBSITE AT THE FOLLOWING ADDRESS:
HTTPS://WWW.WEATHER.GOV/PDT/DSSBRIEFING
IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
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