269
AUUS46 KPDT 101225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI OCT 10 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 4-11 MPH.         W 14-19 MPH.
TRANSPORT WINDS               SW 8-14 MPH.        SW 21-28 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT OCT 11        GOOD.
OUTLOOK FOR SUN OCT 12        GOOD.

VENTILATION INDEX (CATEGORY)  63 (POOR).          716 (GOOD).
OUTLOOK FOR SAT OCT 11        837 (GOOD).
OUTLOOK FOR SUN OCT 12        921 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-6 MPH.          SW 13-18 MPH.
TRANSPORT WINDS               W 3-8 MPH.          SW 22-28 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT OCT 11        FAIR.
OUTLOOK FOR SUN OCT 12        GOOD.

VENTILATION INDEX (CATEGORY)  48 (POOR).          964 (GOOD).
OUTLOOK FOR SAT OCT 11        498 (FAIR).
OUTLOOK FOR SUN OCT 12        529 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-12 MPH.         S 18-21 MPH.
TRANSPORT WINDS               S 8-14 MPH.         S 28-32 MPH.
MIXING HEIGHT                 4000 FT MSL.        12000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT OCT 11        GOOD.
OUTLOOK FOR SUN OCT 12        FAIR.

VENTILATION INDEX (CATEGORY)  163 (POOR).         1050 (GOOD).
OUTLOOK FOR SAT OCT 11        524 (FAIR).
OUTLOOK FOR SUN OCT 12        519 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-10 MPH.         W 12-17 MPH.
TRANSPORT WINDS               S 8-13 MPH.         SW 17-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT OCT 11        GOOD.
OUTLOOK FOR SUN OCT 12        GOOD.

VENTILATION INDEX (CATEGORY)  75 (POOR).          662 (GOOD).
OUTLOOK FOR SAT OCT 11        831 (GOOD).
OUTLOOK FOR SUN OCT 12        773 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      390 (FAIR)
ELLENSBURG    622 (GOOD)
GOLDENDALE    526 (FAIR)
TRI-CITIES    958 (GOOD)
WALLA WALLA   449 (FAIR)
YAKIMA        756 (GOOD)
BEND          845 (GOOD)
PRINEVILLE    797 (GOOD)
ENTERPRISE   1050 (GOOD)
HERMISTON     751 (GOOD)
JOHN DAY     1050 (GOOD)
LA GRANDE    1050 (GOOD)
MADRAS        584 (FAIR)
MEACHAM      1050 (GOOD)
PENDLETON     864 (GOOD)
REDMOND       742 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    382 (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.
$$