AUUS46 KPDT 201225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI JUN 20 2025

*** AIR DISPERSION CATEGORIES:   GOOD, FAIR, POOR ***

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 16-30 MPH.       SW 20-25 MPH.
TRANSPORT WINDS               SW 20-33 MPH.       W 25-27 MPH.
MIXING HEIGHT                 2000 FT MSL.        9000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SAT JUN 21        GOOD.               
OUTLOOK FOR SUN JUN 22        FAIR.               

VENTILATION INDEX (CATEGORY)  509 (FAIR).         1050 (GOOD).
OUTLOOK FOR SAT JUN 21        1021 (GOOD).        
OUTLOOK FOR SUN JUN 22        330 (FAIR).         

FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 8-14 MPH.         W 14-19 MPH.
TRANSPORT WINDS               W 10-17 MPH.        W 17-20 MPH.
MIXING HEIGHT                 2000 FT MSL.        9500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SAT JUN 21        GOOD.               
OUTLOOK FOR SUN JUN 22        FAIR.               

VENTILATION INDEX (CATEGORY)  369 (FAIR).         1050 (GOOD).
OUTLOOK FOR SAT JUN 21        696 (GOOD).         
OUTLOOK FOR SUN JUN 22        141 (POOR).         

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 7-12 MPH.         W 12-13 MPH.
TRANSPORT WINDS               W 12-18 MPH.        W 15-20 MPH.
MIXING HEIGHT                 5000 FT MSL.        10000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SAT JUN 21        GOOD.               
OUTLOOK FOR SUN JUN 22        GOOD.               

VENTILATION INDEX (CATEGORY)  410 (FAIR).         935 (GOOD).
OUTLOOK FOR SAT JUN 21        818 (GOOD).         
OUTLOOK FOR SUN JUN 22        330 (FAIR).         

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 14-28 MPH.       W 18-25 MPH.
TRANSPORT WINDS               SW 20-26 MPH.       SW 24-27 MPH.
MIXING HEIGHT                 2500 FT MSL.        8000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SAT JUN 21        GOOD.               
OUTLOOK FOR SUN JUN 22        FAIR.               

VENTILATION INDEX (CATEGORY)  508 (FAIR).         1050 (GOOD).
OUTLOOK FOR SAT JUN 21        997 (GOOD).         
OUTLOOK FOR SUN JUN 22        269 (POOR).         

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM     1025 (GOOD)
ELLENSBURG   1050 (GOOD)
GOLDENDALE   1050 (GOOD)
TRI-CITIES   1050 (GOOD)
WALLA WALLA  1050 (GOOD)
YAKIMA       1050 (GOOD)
BEND          986 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE    719 (GOOD)
HERMISTON    1050 (GOOD)
JOHN DAY      766 (GOOD)
LA GRANDE    1032 (GOOD)
MADRAS       1050 (GOOD)
MEACHAM      1022 (GOOD)
PENDLETON    1050 (GOOD)
REDMOND      1050 (GOOD)
SENECA        899 (GOOD)
THE DALLES   1050 (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.
$$