351
AUUS46 KPDT 291225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE JUL 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 3-7 MPH.          N 8-11 MPH.
TRANSPORT WINDS               SW 5-9 MPH.         NE 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED JUL 30        FAIR.
OUTLOOK FOR THU JUL 31        GOOD.

VENTILATION INDEX (CATEGORY)  47 (POOR).          399 (FAIR).
OUTLOOK FOR WED JUL 30        268 (POOR).
OUTLOOK FOR THU JUL 31        620 (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 5-10 MPH.        S 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED JUL 30        GOOD.
OUTLOOK FOR THU JUL 31        FAIR.

VENTILATION INDEX (CATEGORY)  62 (POOR).          256 (POOR).
OUTLOOK FOR WED JUL 30        459 (FAIR).
OUTLOOK FOR THU JUL 31        582 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-6 MPH.         N 9-11 MPH.
TRANSPORT WINDS               N 5-9 MPH.          N 9-11 MPH.
MIXING HEIGHT                 4000 FT MSL.        14500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED JUL 30        GOOD.
OUTLOOK FOR THU JUL 31        GOOD.

VENTILATION INDEX (CATEGORY)  128 (POOR).         850 (GOOD).
OUTLOOK FOR WED JUL 30        635 (GOOD).
OUTLOOK FOR THU JUL 31        377 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-6 MPH.          N 8-10 MPH.
TRANSPORT WINDS               S 4-8 MPH.          N 9-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED JUL 30        FAIR.
OUTLOOK FOR THU JUL 31        FAIR.

VENTILATION INDEX (CATEGORY)  38 (POOR).          503 (FAIR).
OUTLOOK FOR WED JUL 30        310 (FAIR).
OUTLOOK FOR THU JUL 31        455 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      396 (FAIR)
ELLENSBURG    373 (FAIR)
GOLDENDALE    393 (FAIR)
TRI-CITIES    265 (POOR)
WALLA WALLA   456 (FAIR)
YAKIMA        284 (POOR)
BEND          478 (FAIR)
PRINEVILLE    471 (FAIR)
ENTERPRISE    614 (GOOD)
HERMISTON     280 (POOR)
JOHN DAY      333 (FAIR)
LA GRANDE     862 (GOOD)
MADRAS        701 (GOOD)
MEACHAM       473 (FAIR)
PENDLETON     474 (FAIR)
REDMOND       593 (FAIR)
SENECA        445 (FAIR)
THE DALLES    294 (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.
$$