862
AUUS46 KPDT 071225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON SEP  7 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 10-22 MPH.       SW 10-14 MPH.
TRANSPORT WINDS               SW 12-22 MPH.       W 13-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR TUE SEP 8         POOR.
OUTLOOK FOR WED SEP 9         FAIR.

VENTILATION INDEX (CATEGORY)  166 (POOR).         727 (GOOD).
OUTLOOK FOR TUE SEP 8         113 (POOR).
OUTLOOK FOR WED SEP 9         117 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-9 MPH.          NW 3-7 MPH.
TRANSPORT WINDS               W 6-12 MPH.         W 7-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE SEP 8         POOR.
OUTLOOK FOR WED SEP 9         FAIR.

VENTILATION INDEX (CATEGORY)  64 (POOR).          471 (FAIR).
OUTLOOK FOR TUE SEP 8         177 (POOR).
OUTLOOK FOR WED SEP 9         135 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-8 MPH.         SW 1-4 MPH.
TRANSPORT WINDS               SW 6-11 MPH.        W 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE SEP 8         FAIR.
OUTLOOK FOR WED SEP 9         FAIR.

VENTILATION INDEX (CATEGORY)  106 (POOR).         464 (FAIR).
OUTLOOK FOR TUE SEP 8         154 (POOR).
OUTLOOK FOR WED SEP 9         267 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 10-19 MPH.       W 8-13 MPH.
TRANSPORT WINDS               SW 14-20 MPH.       W 12-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR TUE SEP 8         POOR.
OUTLOOK FOR WED SEP 9         FAIR.

VENTILATION INDEX (CATEGORY)  200 (POOR).         723 (GOOD).
OUTLOOK FOR TUE SEP 8         141 (POOR).
OUTLOOK FOR WED SEP 9         207 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      509 (FAIR)
ELLENSBURG    750 (GOOD)
GOLDENDALE    435 (FAIR)
TRI-CITIES    710 (GOOD)
WALLA WALLA   834 (GOOD)
YAKIMA        578 (FAIR)
BEND          238 (POOR)
PRINEVILLE    203 (POOR)
ENTERPRISE    532 (FAIR)
HERMISTON     669 (GOOD)
JOHN DAY      321 (FAIR)
LA GRANDE     533 (FAIR)
MADRAS        219 (POOR)
MEACHAM       560 (FAIR)
PENDLETON     744 (GOOD)
REDMOND       172 (POOR)
SENECA        397 (FAIR)
THE DALLES    541 (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.
$$