849
AUUS46 KPDT 261225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU JUN 26 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 10-19 MPH.       SW 14-19 MPH.
TRANSPORT WINDS               SW 11-19 MPH.       W 17-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR FRI JUN 27        GOOD.
OUTLOOK FOR SAT JUN 28        FAIR.

VENTILATION INDEX (CATEGORY)  250 (POOR).         877 (GOOD).
OUTLOOK FOR FRI JUN 27        887 (GOOD).
OUTLOOK FOR SAT JUN 28        571 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-8 MPH.          W 10-14 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         W 11-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI JUN 27        FAIR.
OUTLOOK FOR SAT JUN 28        FAIR.

VENTILATION INDEX (CATEGORY)  124 (POOR).         677 (GOOD).
OUTLOOK FOR FRI JUN 27        521 (FAIR).
OUTLOOK FOR SAT JUN 28        322 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-5 MPH.         NW 8-10 MPH.
TRANSPORT WINDS               W 5-9 MPH.          W 11-13 MPH.
MIXING HEIGHT                 4500 FT MSL.        10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI JUN 27        GOOD.
OUTLOOK FOR SAT JUN 28        GOOD.

VENTILATION INDEX (CATEGORY)  144 (POOR).         676 (GOOD).
OUTLOOK FOR FRI JUN 27        731 (GOOD).
OUTLOOK FOR SAT JUN 28        509 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 8-19 MPH.        W 12-18 MPH.
TRANSPORT WINDS               SW 10-18 MPH.       W 14-19 MPH.
MIXING HEIGHT                 2000 FT MSL.        7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR FRI JUN 27        GOOD.
OUTLOOK FOR SAT JUN 28        FAIR.

VENTILATION INDEX (CATEGORY)  247 (POOR).         757 (GOOD).
OUTLOOK FOR FRI JUN 27        874 (GOOD).
OUTLOOK FOR SAT JUN 28        639 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      715 (GOOD)
ELLENSBURG    920 (GOOD)
GOLDENDALE    796 (GOOD)
TRI-CITIES    879 (GOOD)
WALLA WALLA   799 (GOOD)
YAKIMA        607 (GOOD)
BEND          646 (GOOD)
PRINEVILLE    588 (FAIR)
ENTERPRISE    581 (FAIR)
HERMISTON     898 (GOOD)
JOHN DAY      900 (GOOD)
LA GRANDE     772 (GOOD)
MADRAS        635 (GOOD)
MEACHAM       518 (FAIR)
PENDLETON     922 (GOOD)
REDMOND       611 (GOOD)
SENECA        941 (GOOD)
THE DALLES    905 (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.
$$