770
AUUS46 KPDT 131225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI JUN 13 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 8-15 MPH.        W 11-14 MPH.
TRANSPORT WINDS               SW 9-16 MPH.        W 11-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SAT JUN 14        FAIR.
OUTLOOK FOR SUN JUN 15        FAIR.

VENTILATION INDEX (CATEGORY)  154 (POOR).         585 (FAIR).
OUTLOOK FOR SAT JUN 14        468 (FAIR).
OUTLOOK FOR SUN JUN 15        178 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-8 MPH.          NW 7-10 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        W 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUN 14        POOR.
OUTLOOK FOR SUN JUN 15        POOR.

VENTILATION INDEX (CATEGORY)  97 (POOR).          465 (FAIR).
OUTLOOK FOR SAT JUN 14        256 (POOR).
OUTLOOK FOR SUN JUN 15        190 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         NW 9-11 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         NW 9-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT JUN 14        GOOD.
OUTLOOK FOR SUN JUN 15        GOOD.

VENTILATION INDEX (CATEGORY)  83 (POOR).          429 (FAIR).
OUTLOOK FOR SAT JUN 14        345 (FAIR).
OUTLOOK FOR SUN JUN 15        386 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 6-16 MPH.        W 10-13 MPH.
TRANSPORT WINDS               SW 8-15 MPH.        W 10-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUN 14        FAIR.
OUTLOOK FOR SUN JUN 15        FAIR.

VENTILATION INDEX (CATEGORY)  142 (POOR).         486 (FAIR).
OUTLOOK FOR SAT JUN 14        359 (FAIR).
OUTLOOK FOR SUN JUN 15        215 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      569 (FAIR)
ELLENSBURG    852 (GOOD)
GOLDENDALE    695 (GOOD)
TRI-CITIES    507 (FAIR)
WALLA WALLA   455 (FAIR)
YAKIMA        460 (FAIR)
BEND          586 (FAIR)
PRINEVILLE    626 (GOOD)
ENTERPRISE    334 (FAIR)
HERMISTON     573 (FAIR)
JOHN DAY      643 (GOOD)
LA GRANDE     435 (FAIR)
MADRAS        535 (FAIR)
MEACHAM       331 (FAIR)
PENDLETON     564 (FAIR)
REDMOND       644 (GOOD)
SENECA        703 (GOOD)
THE DALLES    747 (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.
$$