050
AUUS46 KPDT 061225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI JUN  6 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 5-10 MPH.         W 10-14 MPH.
TRANSPORT WINDS               S 5-10 MPH.         W 10-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUN 7         POOR.
OUTLOOK FOR SUN JUN 8         FAIR.

VENTILATION INDEX (CATEGORY)  47 (POOR).          682 (GOOD).
OUTLOOK FOR SAT JUN 7         268 (POOR).
OUTLOOK FOR SUN JUN 8         279 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-6 MPH.          NW 6-11 MPH.
TRANSPORT WINDS               W 4-7 MPH.          W 7-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUN 7         POOR.
OUTLOOK FOR SUN JUN 8         POOR.

VENTILATION INDEX (CATEGORY)  49 (POOR).          508 (FAIR).
OUTLOOK FOR SAT JUN 7         170 (POOR).
OUTLOOK FOR SUN JUN 8         267 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 1-3 MPH.          NW 4-5 MPH.
TRANSPORT WINDS               S 2-3 MPH.          W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT JUN 7         GOOD.
OUTLOOK FOR SUN JUN 8         GOOD.

VENTILATION INDEX (CATEGORY)  25 (POOR).          304 (FAIR).
OUTLOOK FOR SAT JUN 7         223 (POOR).
OUTLOOK FOR SUN JUN 8         414 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-8 MPH.          W 8-14 MPH.
TRANSPORT WINDS               S 6-8 MPH.          W 9-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUN 7         FAIR.
OUTLOOK FOR SUN JUN 8         FAIR.

VENTILATION INDEX (CATEGORY)  50 (POOR).          574 (FAIR).
OUTLOOK FOR SAT JUN 7         284 (POOR).
OUTLOOK FOR SUN JUN 8         274 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      839 (GOOD)
ELLENSBURG    937 (GOOD)
GOLDENDALE    753 (GOOD)
TRI-CITIES    741 (GOOD)
WALLA WALLA   622 (GOOD)
YAKIMA        627 (GOOD)
BEND          338 (FAIR)
PRINEVILLE    389 (FAIR)
ENTERPRISE    295 (POOR)
HERMISTON     639 (GOOD)
JOHN DAY      501 (FAIR)
LA GRANDE     333 (FAIR)
MADRAS        374 (FAIR)
MEACHAM       416 (FAIR)
PENDLETON     572 (FAIR)
REDMOND       367 (FAIR)
SENECA        556 (FAIR)
THE DALLES    708 (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.
$$