993
AUUS46 KPDT 121225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU JUN 12 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 12-24 MPH.       W 14-19 MPH.
TRANSPORT WINDS               SW 14-24 MPH.       W 14-19 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR FRI JUN 13        GOOD.
OUTLOOK FOR SAT JUN 14        FAIR.

VENTILATION INDEX (CATEGORY)  210 (POOR).         766 (GOOD).
OUTLOOK FOR FRI JUN 13        558 (FAIR).
OUTLOOK FOR SAT JUN 14        381 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 5-10 MPH.         W 10-14 MPH.
TRANSPORT WINDS               W 6-11 MPH.         W 12-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI JUN 13        FAIR.
OUTLOOK FOR SAT JUN 14        POOR.

VENTILATION INDEX (CATEGORY)  77 (POOR).          789 (GOOD).
OUTLOOK FOR FRI JUN 13        402 (FAIR).
OUTLOOK FOR SAT JUN 14        223 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-4 MPH.         NW 10-12 MPH.
TRANSPORT WINDS               W 6-8 MPH.          W 10-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI JUN 13        GOOD.
OUTLOOK FOR SAT JUN 14        GOOD.

VENTILATION INDEX (CATEGORY)  95 (POOR).          531 (FAIR).
OUTLOOK FOR FRI JUN 13        392 (FAIR).
OUTLOOK FOR SAT JUN 14        406 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 9-24 MPH.         W 13-18 MPH.
TRANSPORT WINDS               SW 13-23 MPH.       W 13-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR FRI JUN 13        FAIR.
OUTLOOK FOR SAT JUN 14        FAIR.

VENTILATION INDEX (CATEGORY)  234 (POOR).         669 (GOOD).
OUTLOOK FOR FRI JUN 13        488 (FAIR).
OUTLOOK FOR SAT JUN 14        322 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      811 (GOOD)
ELLENSBURG   1015 (GOOD)
GOLDENDALE    801 (GOOD)
TRI-CITIES    673 (GOOD)
WALLA WALLA   611 (GOOD)
YAKIMA        996 (GOOD)
BEND          605 (GOOD)
PRINEVILLE    552 (FAIR)
ENTERPRISE    457 (FAIR)
HERMISTON     754 (GOOD)
JOHN DAY      603 (GOOD)
LA GRANDE     618 (GOOD)
MADRAS        555 (FAIR)
MEACHAM       502 (FAIR)
PENDLETON     779 (GOOD)
REDMOND       563 (FAIR)
SENECA        692 (GOOD)
THE DALLES    790 (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.
$$