961
AUUS46 KPDT 101225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED JUN 10 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 12-21 MPH.       W 10-14 MPH.
TRANSPORT WINDS               W 17-28 MPH.        W 15-18 MPH.
MIXING HEIGHT                 2000 FT MSL.        9000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR THU JUN 11        FAIR.
OUTLOOK FOR FRI JUN 12        GOOD.

VENTILATION INDEX (CATEGORY)  476 (FAIR).         1046 (GOOD).
OUTLOOK FOR THU JUN 11        401 (FAIR).
OUTLOOK FOR FRI JUN 12        566 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-14 MPH.         NW 8-14 MPH.
TRANSPORT WINDS               W 8-15 MPH.         NW 11-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU JUN 11        FAIR.
OUTLOOK FOR FRI JUN 12        FAIR.

VENTILATION INDEX (CATEGORY)  316 (FAIR).         893 (GOOD).
OUTLOOK FOR THU JUN 11        284 (POOR).
OUTLOOK FOR FRI JUN 12        447 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-11 MPH.         NW 8-14 MPH.
TRANSPORT WINDS               W 14-19 MPH.        W 15-17 MPH.
MIXING HEIGHT                 5000 FT MSL.        8500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR THU JUN 11        GOOD.
OUTLOOK FOR FRI JUN 12        GOOD.

VENTILATION INDEX (CATEGORY)  467 (FAIR).         851 (GOOD).
OUTLOOK FOR THU JUN 11        363 (FAIR).
OUTLOOK FOR FRI JUN 12        542 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 11-18 MPH.       W 10-15 MPH.
TRANSPORT WINDS               W 18-26 MPH.        W 16-19 MPH.
MIXING HEIGHT                 2500 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR THU JUN 11        FAIR.
OUTLOOK FOR FRI JUN 12        GOOD.

VENTILATION INDEX (CATEGORY)  484 (FAIR).         1000 (GOOD).
OUTLOOK FOR THU JUN 11        354 (FAIR).
OUTLOOK FOR FRI JUN 12        604 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      761 (GOOD)
ELLENSBURG   1050 (GOOD)
GOLDENDALE    946 (GOOD)
TRI-CITIES   1050 (GOOD)
WALLA WALLA  1028 (GOOD)
YAKIMA       1002 (GOOD)
BEND          662 (GOOD)
PRINEVILLE    727 (GOOD)
ENTERPRISE    935 (GOOD)
HERMISTON    1050 (GOOD)
JOHN DAY      959 (GOOD)
LA GRANDE     920 (GOOD)
MADRAS        808 (GOOD)
MEACHAM       793 (GOOD)
PENDLETON    1050 (GOOD)
REDMOND       711 (GOOD)
SENECA       1050 (GOOD)
THE DALLES   1050 (GOOD)

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.
$$