145
AUUS46 KPDT 151225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE JUL 15 2025

*** AIR DISPERSION CATEGORIES:   GOOD, FAIR, POOR ***

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 7-16 MPH.         N 12-16 MPH.
TRANSPORT WINDS               NW 9-17 MPH.        N 13-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR WED JUL 16        POOR.
OUTLOOK FOR THU JUL 17        GOOD.

VENTILATION INDEX (CATEGORY)  238 (POOR).         888 (GOOD).
OUTLOOK FOR WED JUL 16        248 (POOR).
OUTLOOK FOR THU JUL 17        780 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 6-14 MPH.        NE 13-17 MPH.
TRANSPORT WINDS               N 9-20 MPH.         N 18-21 MPH.
MIXING HEIGHT                 2000 FT MSL.        9000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR WED JUL 16        POOR.
OUTLOOK FOR THU JUL 17        FAIR.

VENTILATION INDEX (CATEGORY)  407 (FAIR).         1050 (GOOD).
OUTLOOK FOR WED JUL 16        209 (POOR).
OUTLOOK FOR THU JUL 17        458 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 5-11 MPH.        NW 14-19 MPH.
TRANSPORT WINDS               W 7-12 MPH.         N 14-19 MPH.
MIXING HEIGHT                 4500 FT MSL.        10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED JUL 16        GOOD.
OUTLOOK FOR THU JUL 17        GOOD.

VENTILATION INDEX (CATEGORY)  222 (POOR).         862 (GOOD).
OUTLOOK FOR WED JUL 16        241 (POOR).
OUTLOOK FOR THU JUL 17        961 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 5-10 MPH.        N 11-14 MPH.
TRANSPORT WINDS               W 7-10 MPH.         N 13-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED JUL 16        FAIR.
OUTLOOK FOR THU JUL 17        GOOD.

VENTILATION INDEX (CATEGORY)  162 (POOR).         705 (GOOD).
OUTLOOK FOR WED JUL 16        258 (POOR).
OUTLOOK FOR THU JUL 17        932 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      996 (GOOD)
ELLENSBURG   1050 (GOOD)
GOLDENDALE   1022 (GOOD)
TRI-CITIES   1050 (GOOD)
WALLA WALLA   660 (GOOD)
YAKIMA       1050 (GOOD)
BEND          575 (FAIR)
PRINEVILLE    692 (GOOD)
ENTERPRISE    702 (GOOD)
HERMISTON     919 (GOOD)
JOHN DAY      715 (GOOD)
LA GRANDE     833 (GOOD)
MADRAS        858 (GOOD)
MEACHAM       595 (FAIR)
PENDLETON     802 (GOOD)
REDMOND       742 (GOOD)
SENECA        651 (GOOD)
THE DALLES    956 (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.
$$