633
AUUS46 KPDT 051225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU JUN  5 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 3-7 MPH.          N 6-10 MPH.
TRANSPORT WINDS               SW 5-9 MPH.         NE 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI JUN 6         FAIR.
OUTLOOK FOR SAT JUN 7         FAIR.

VENTILATION INDEX (CATEGORY)  57 (POOR).          431 (FAIR).
OUTLOOK FOR FRI JUN 6         534 (FAIR).
OUTLOOK FOR SAT JUN 7         258 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         SE 3-6 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        NE 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI JUN 6         FAIR.
OUTLOOK FOR SAT JUN 7         POOR.

VENTILATION INDEX (CATEGORY)  76 (POOR).          411 (FAIR).
OUTLOOK FOR FRI JUN 6         406 (FAIR).
OUTLOOK FOR SAT JUN 7         165 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-4 MPH.         N 8-11 MPH.
TRANSPORT WINDS               N 4-7 MPH.          N 9-11 MPH.
MIXING HEIGHT                 4000 FT MSL.        11500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI JUN 6         GOOD.
OUTLOOK FOR SAT JUN 7         GOOD.

VENTILATION INDEX (CATEGORY)  145 (POOR).         711 (GOOD).
OUTLOOK FOR FRI JUN 6         270 (POOR).
OUTLOOK FOR SAT JUN 7         223 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-6 MPH.          N 8-10 MPH.
TRANSPORT WINDS               S 4-8 MPH.          NE 8-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI JUN 6         FAIR.
OUTLOOK FOR SAT JUN 7         FAIR.

VENTILATION INDEX (CATEGORY)  38 (POOR).          475 (FAIR).
OUTLOOK FOR FRI JUN 6         453 (FAIR).
OUTLOOK FOR SAT JUN 7         269 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      370 (FAIR)
ELLENSBURG    408 (FAIR)
GOLDENDALE    416 (FAIR)
TRI-CITIES    352 (FAIR)
WALLA WALLA   461 (FAIR)
YAKIMA        383 (FAIR)
BEND          454 (FAIR)
PRINEVILLE    541 (FAIR)
ENTERPRISE    621 (GOOD)
HERMISTON     387 (FAIR)
JOHN DAY      458 (FAIR)
LA GRANDE     688 (GOOD)
MADRAS        627 (GOOD)
MEACHAM       443 (FAIR)
PENDLETON     471 (FAIR)
REDMOND       541 (FAIR)
SENECA        375 (FAIR)
THE DALLES    373 (FAIR)

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.
$$