390
AUUS46 KPDT 291225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI MAY 29 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 14-29 MPH. SW 22-31 MPH.
TRANSPORT WINDS SW 14-28 MPH. SW 23-32 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY GOOD. GOOD.
OUTLOOK FOR SAT MAY 30 GOOD.
OUTLOOK FOR SUN MAY 31 FAIR.
VENTILATION INDEX (CATEGORY) 305 (FAIR). 899 (GOOD).
OUTLOOK FOR SAT MAY 30 638 (GOOD).
OUTLOOK FOR SUN MAY 31 475 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 6-12 MPH. W 13-17 MPH.
TRANSPORT WINDS W 6-12 MPH. W 14-19 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT MAY 30 FAIR.
OUTLOOK FOR SUN MAY 31 FAIR.
VENTILATION INDEX (CATEGORY) 101 (POOR). 540 (FAIR).
OUTLOOK FOR SAT MAY 30 466 (FAIR).
OUTLOOK FOR SUN MAY 31 288 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SW 1-3 MPH. NW 13-17 MPH.
TRANSPORT WINDS SW 5-6 MPH. W 14-18 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT MAY 30 FAIR.
OUTLOOK FOR SUN MAY 31 FAIR.
VENTILATION INDEX (CATEGORY) 72 (POOR). 508 (FAIR).
OUTLOOK FOR SAT MAY 30 524 (FAIR).
OUTLOOK FOR SUN MAY 31 452 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 5-17 MPH. W 20-30 MPH.
TRANSPORT WINDS SW 9-17 MPH. W 21-29 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR SAT MAY 30 FAIR.
OUTLOOK FOR SUN MAY 31 FAIR.
VENTILATION INDEX (CATEGORY) 225 (POOR). 832 (GOOD).
OUTLOOK FOR SAT MAY 30 582 (FAIR).
OUTLOOK FOR SUN MAY 31 405 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 515 (FAIR)
ELLENSBURG 791 (GOOD)
GOLDENDALE 723 (GOOD)
TRI-CITIES 631 (GOOD)
WALLA WALLA 823 (GOOD)
YAKIMA 578 (FAIR)
BEND 250 (POOR)
PRINEVILLE 313 (FAIR)
ENTERPRISE 462 (FAIR)
HERMISTON 808 (GOOD)
JOHN DAY 552 (FAIR)
LA GRANDE 536 (FAIR)
MADRAS 282 (POOR)
MEACHAM 466 (FAIR)
PENDLETON 991 (GOOD)
REDMOND 373 (FAIR)
SENECA 359 (FAIR)
THE DALLES 916 (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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