773
AUUS46 KPDT 231225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON JUN 23 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-11 MPH.         W 5-9 MPH.
TRANSPORT WINDS               SW 8-12 MPH.        SW 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE JUN 24        GOOD.
OUTLOOK FOR WED JUN 25        GOOD.

VENTILATION INDEX (CATEGORY)  148 (POOR).         500 (FAIR).
OUTLOOK FOR TUE JUN 24        475 (FAIR).
OUTLOOK FOR WED JUN 25        970 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-5 MPH.          SE 4-8 MPH.
TRANSPORT WINDS               NW 3-7 MPH.         SW 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE JUN 24        GOOD.
OUTLOOK FOR WED JUN 25        GOOD.

VENTILATION INDEX (CATEGORY)  59 (POOR).          336 (FAIR).
OUTLOOK FOR TUE JUN 24        611 (GOOD).
OUTLOOK FOR WED JUN 25        651 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-4 MPH.          SE 4-5 MPH.
TRANSPORT WINDS               S 4-6 MPH.          S 7-8 MPH.
MIXING HEIGHT                 4000 FT MSL.        11500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE JUN 24        GOOD.
OUTLOOK FOR WED JUN 25        GOOD.

VENTILATION INDEX (CATEGORY)  125 (POOR).         527 (FAIR).
OUTLOOK FOR TUE JUN 24        748 (GOOD).
OUTLOOK FOR WED JUN 25        700 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-12 MPH.         NW 4-8 MPH.
TRANSPORT WINDS               S 8-14 MPH.         SW 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE JUN 24        FAIR.
OUTLOOK FOR WED JUN 25        GOOD.

VENTILATION INDEX (CATEGORY)  178 (POOR).         504 (FAIR).
OUTLOOK FOR TUE JUN 24        553 (FAIR).
OUTLOOK FOR WED JUN 25        851 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      399 (FAIR)
ELLENSBURG    332 (FAIR)
GOLDENDALE    418 (FAIR)
TRI-CITIES    520 (FAIR)
WALLA WALLA   502 (FAIR)
YAKIMA        340 (FAIR)
BEND          336 (FAIR)
PRINEVILLE    370 (FAIR)
ENTERPRISE    355 (FAIR)
HERMISTON     479 (FAIR)
JOHN DAY      412 (FAIR)
LA GRANDE     503 (FAIR)
MADRAS        369 (FAIR)
MEACHAM       468 (FAIR)
PENDLETON     469 (FAIR)
REDMOND       322 (FAIR)
SENECA        413 (FAIR)
THE DALLES    379 (FAIR)

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.
$$