875
AUUS46 KPDT 081225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE JUL  8 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 5-11 MPH.         W 9-13 MPH.
TRANSPORT WINDS               SW 8-14 MPH.        W 9-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED JUL 9         GOOD.
OUTLOOK FOR THU JUL 10        FAIR.

VENTILATION INDEX (CATEGORY)  126 (POOR).         447 (FAIR).
OUTLOOK FOR WED JUL 9         815 (GOOD).
OUTLOOK FOR THU JUL 10        525 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          W 8-11 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        W 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED JUL 9         GOOD.
OUTLOOK FOR THU JUL 10        FAIR.

VENTILATION INDEX (CATEGORY)  82 (POOR).          433 (FAIR).
OUTLOOK FOR WED JUL 9         704 (GOOD).
OUTLOOK FOR THU JUL 10        401 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-4 MPH.          NW 5-6 MPH.
TRANSPORT WINDS               SW 4-5 MPH.         SW 7-9 MPH.
MIXING HEIGHT                 4000 FT MSL.        10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED JUL 9         GOOD.
OUTLOOK FOR THU JUL 10        GOOD.

VENTILATION INDEX (CATEGORY)  62 (POOR).          391 (FAIR).
OUTLOOK FOR WED JUL 9         572 (FAIR).
OUTLOOK FOR THU JUL 10        581 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-10 MPH.         NW 7-13 MPH.
TRANSPORT WINDS               S 9-13 MPH.         W 7-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED JUL 9         GOOD.
OUTLOOK FOR THU JUL 10        GOOD.

VENTILATION INDEX (CATEGORY)  129 (POOR).         387 (FAIR).
OUTLOOK FOR WED JUL 9         836 (GOOD).
OUTLOOK FOR THU JUL 10        559 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      687 (GOOD)
ELLENSBURG    804 (GOOD)
GOLDENDALE    616 (GOOD)
TRI-CITIES    451 (FAIR)
WALLA WALLA   393 (FAIR)
YAKIMA        447 (FAIR)
BEND          138 (POOR)
PRINEVILLE    482 (FAIR)
ENTERPRISE    661 (GOOD)
HERMISTON     466 (FAIR)
JOHN DAY     1050 (GOOD)
LA GRANDE     396 (FAIR)
MADRAS        358 (FAIR)
MEACHAM       205 (POOR)
PENDLETON     407 (FAIR)
REDMOND       437 (FAIR)
SENECA       1050 (GOOD)
THE DALLES    663 (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.
$$