748
AUUS46 KPDT 251225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED JUN 25 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 9-17 MPH.        W 17-21 MPH.
TRANSPORT WINDS               SW 11-18 MPH.       W 20-23 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR THU JUN 26        GOOD.
OUTLOOK FOR FRI JUN 27        GOOD.

VENTILATION INDEX (CATEGORY)  256 (POOR).         1013 (GOOD).
OUTLOOK FOR THU JUN 26        905 (GOOD).
OUTLOOK FOR FRI JUN 27        739 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-8 MPH.          W 11-16 MPH.
TRANSPORT WINDS               W 5-9 MPH.          W 12-19 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU JUN 26        FAIR.
OUTLOOK FOR FRI JUN 27        FAIR.

VENTILATION INDEX (CATEGORY)  156 (POOR).         888 (GOOD).
OUTLOOK FOR THU JUN 26        486 (FAIR).
OUTLOOK FOR FRI JUN 27        412 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-3 MPH.          W 7-8 MPH.
TRANSPORT WINDS               SW 4-7 MPH.         SW 11-14 MPH.
MIXING HEIGHT                 4000 FT MSL.        11500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU JUN 26        GOOD.
OUTLOOK FOR FRI JUN 27        GOOD.

VENTILATION INDEX (CATEGORY)  95 (POOR).          756 (GOOD).
OUTLOOK FOR THU JUN 26        539 (FAIR).
OUTLOOK FOR FRI JUN 27        639 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 6-19 MPH.        W 12-19 MPH.
TRANSPORT WINDS               SW 11-19 MPH.       W 15-22 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR THU JUN 26        FAIR.
OUTLOOK FOR FRI JUN 27        GOOD.

VENTILATION INDEX (CATEGORY)  239 (POOR).         849 (GOOD).
OUTLOOK FOR THU JUN 26        729 (GOOD).
OUTLOOK FOR FRI JUN 27        731 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      695 (GOOD)
ELLENSBURG    948 (GOOD)
GOLDENDALE    760 (GOOD)
TRI-CITIES   1050 (GOOD)
WALLA WALLA   976 (GOOD)
YAKIMA        706 (GOOD)
BEND          909 (GOOD)
PRINEVILLE    831 (GOOD)
ENTERPRISE    781 (GOOD)
HERMISTON    1050 (GOOD)
JOHN DAY     1050 (GOOD)
LA GRANDE     917 (GOOD)
MADRAS        990 (GOOD)
MEACHAM       611 (GOOD)
PENDLETON     972 (GOOD)
REDMOND       783 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    906 (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.
$$