898
AUUS46 KPDT 291225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN JUN 29 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 2-5 MPH.          N 8-11 MPH.
TRANSPORT WINDS               SW 3-6 MPH.         NE 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON JUN 30        FAIR.
OUTLOOK FOR TUE JUL 1         FAIR.

VENTILATION INDEX (CATEGORY)  36 (POOR).          401 (FAIR).
OUTLOOK FOR MON JUN 30        257 (POOR).
OUTLOOK FOR TUE JUL 1         280 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         SE 3-6 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        E 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON JUN 30        POOR.
OUTLOOK FOR TUE JUL 1         FAIR.

VENTILATION INDEX (CATEGORY)  65 (POOR).          263 (POOR).
OUTLOOK FOR MON JUN 30        164 (POOR).
OUTLOOK FOR TUE JUL 1         313 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-5 MPH.         N 8-10 MPH.
TRANSPORT WINDS               N 4-7 MPH.          N 8-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON JUN 30        GOOD.
OUTLOOK FOR TUE JUL 1         GOOD.

VENTILATION INDEX (CATEGORY)  100 (POOR).         460 (FAIR).
OUTLOOK FOR MON JUN 30        302 (FAIR).
OUTLOOK FOR TUE JUL 1         478 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-7 MPH.          N 8-10 MPH.
TRANSPORT WINDS               S 4-7 MPH.          NE 8-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON JUN 30        FAIR.
OUTLOOK FOR TUE JUL 1         FAIR.

VENTILATION INDEX (CATEGORY)  34 (POOR).          411 (FAIR).
OUTLOOK FOR MON JUN 30        238 (POOR).
OUTLOOK FOR TUE JUL 1         247 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      274 (POOR)
ELLENSBURG    272 (POOR)
GOLDENDALE    398 (FAIR)
TRI-CITIES    268 (POOR)
WALLA WALLA   346 (FAIR)
YAKIMA        258 (POOR)
BEND          312 (FAIR)
PRINEVILLE    265 (POOR)
ENTERPRISE    280 (POOR)
HERMISTON     364 (FAIR)
JOHN DAY      154 (POOR)
LA GRANDE     437 (FAIR)
MADRAS        417 (FAIR)
MEACHAM       290 (POOR)
PENDLETON     457 (FAIR)
REDMOND       348 (FAIR)
SENECA        202 (POOR)
THE DALLES    407 (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.
$$