678
AUUS46 KPDT 171225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE JUN 17 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 9-17 MPH.        SW 13-18 MPH.
TRANSPORT WINDS               SW 11-18 MPH.       W 16-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR WED JUN 18        GOOD.
OUTLOOK FOR THU JUN 19        FAIR.

VENTILATION INDEX (CATEGORY)  237 (POOR).         799 (GOOD).
OUTLOOK FOR WED JUN 18        888 (GOOD).
OUTLOOK FOR THU JUN 19        408 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          W 7-12 MPH.
TRANSPORT WINDS               W 4-8 MPH.          W 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED JUN 18        GOOD.
OUTLOOK FOR THU JUN 19        POOR.

VENTILATION INDEX (CATEGORY)  79 (POOR).          485 (FAIR).
OUTLOOK FOR WED JUN 18        722 (GOOD).
OUTLOOK FOR THU JUN 19        191 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-4 MPH.         NW 7-9 MPH.
TRANSPORT WINDS               W 4-8 MPH.          W 10-13 MPH.
MIXING HEIGHT                 4000 FT MSL.        10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED JUN 18        GOOD.
OUTLOOK FOR THU JUN 19        FAIR.

VENTILATION INDEX (CATEGORY)  93 (POOR).          578 (FAIR).
OUTLOOK FOR WED JUN 18        412 (FAIR).
OUTLOOK FOR THU JUN 19        357 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-19 MPH.         W 10-17 MPH.
TRANSPORT WINDS               SW 11-19 MPH.       W 13-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR WED JUN 18        FAIR.
OUTLOOK FOR THU JUN 19        FAIR.

VENTILATION INDEX (CATEGORY)  229 (POOR).         634 (GOOD).
OUTLOOK FOR WED JUN 18        614 (GOOD).
OUTLOOK FOR THU JUN 19        337 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      620 (GOOD)
ELLENSBURG    709 (GOOD)
GOLDENDALE    754 (GOOD)
TRI-CITIES    766 (GOOD)
WALLA WALLA   662 (GOOD)
YAKIMA        423 (FAIR)
BEND          455 (FAIR)
PRINEVILLE    456 (FAIR)
ENTERPRISE    550 (FAIR)
HERMISTON     883 (GOOD)
JOHN DAY      790 (GOOD)
LA GRANDE     678 (GOOD)
MADRAS        459 (FAIR)
MEACHAM       460 (FAIR)
PENDLETON     727 (GOOD)
REDMOND       466 (FAIR)
SENECA        800 (GOOD)
THE DALLES    808 (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.
$$