450
AUUS46 KPDT 301225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON JUN 30 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-7 MPH.         N 5-9 MPH.
TRANSPORT WINDS               SW 3-6 MPH.         NW 5-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE JUL 1         FAIR.
OUTLOOK FOR WED JUL 2         GOOD.

VENTILATION INDEX (CATEGORY)  30 (POOR).          310 (FAIR).
OUTLOOK FOR TUE JUL 1         297 (POOR).
OUTLOOK FOR WED JUL 2         612 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         E 3-6 MPH.
TRANSPORT WINDS               NW 6-8 MPH.         NW 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE JUL 1         POOR.
OUTLOOK FOR WED JUL 2         FAIR.

VENTILATION INDEX (CATEGORY)  55 (POOR).          189 (POOR).
OUTLOOK FOR TUE JUL 1         292 (POOR).
OUTLOOK FOR WED JUL 2         515 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 1-3 MPH.          N 5-6 MPH.
TRANSPORT WINDS               N 3-6 MPH.          NW 7-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE JUL 1         GOOD.
OUTLOOK FOR WED JUL 2         GOOD.

VENTILATION INDEX (CATEGORY)  38 (POOR).          362 (FAIR).
OUTLOOK FOR TUE JUL 1         448 (FAIR).
OUTLOOK FOR WED JUL 2         435 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-6 MPH.         NW 6-8 MPH.
TRANSPORT WINDS               SE 4-7 MPH.         NW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE JUL 1         FAIR.
OUTLOOK FOR WED JUL 2         FAIR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          286 (POOR).
OUTLOOK FOR TUE JUL 1         321 (FAIR).
OUTLOOK FOR WED JUL 2         566 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      174 (POOR)
ELLENSBURG    147 (POOR)
GOLDENDALE    204 (POOR)
TRI-CITIES    245 (POOR)
WALLA WALLA   189 (POOR)
YAKIMA         63 (POOR)
BEND          181 (POOR)
PRINEVILLE    409 (FAIR)
ENTERPRISE    447 (FAIR)
HERMISTON     309 (FAIR)
JOHN DAY      393 (FAIR)
LA GRANDE     400 (FAIR)
MADRAS        392 (FAIR)
MEACHAM       341 (FAIR)
PENDLETON     325 (FAIR)
REDMOND       354 (FAIR)
SENECA        451 (FAIR)
THE DALLES    147 (POOR)

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.
$$