507
AUUS46 KPDT 131225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN JUL 13 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 4-9 MPH.          W 8-10 MPH.
TRANSPORT WINDS               SW 5-9 MPH.         W 8-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON JUL 14        GOOD.
OUTLOOK FOR TUE JUL 15        GOOD.

VENTILATION INDEX (CATEGORY)  86 (POOR).          476 (FAIR).
OUTLOOK FOR MON JUL 14        692 (GOOD).
OUTLOOK FOR TUE JUL 15        840 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-8 MPH.          NW 9-13 MPH.
TRANSPORT WINDS               NW 6-12 MPH.        NW 10-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON JUL 14        GOOD.
OUTLOOK FOR TUE JUL 15        GOOD.

VENTILATION INDEX (CATEGORY)  105 (POOR).         569 (FAIR).
OUTLOOK FOR MON JUL 14        560 (FAIR).
OUTLOOK FOR TUE JUL 15        1050 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-3 MPH.         NW 8-11 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         NW 9-10 MPH.
MIXING HEIGHT                 4000 FT MSL.        10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON JUL 14        GOOD.
OUTLOOK FOR TUE JUL 15        GOOD.

VENTILATION INDEX (CATEGORY)  85 (POOR).          552 (FAIR).
OUTLOOK FOR MON JUL 14        982 (GOOD).
OUTLOOK FOR TUE JUL 15        746 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-10 MPH.         W 7-12 MPH.
TRANSPORT WINDS               S 7-13 MPH.         W 9-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON JUL 14        GOOD.
OUTLOOK FOR TUE JUL 15        FAIR.

VENTILATION INDEX (CATEGORY)  95 (POOR).          469 (FAIR).
OUTLOOK FOR MON JUL 14        902 (GOOD).
OUTLOOK FOR TUE JUL 15        604 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      758 (GOOD)
ELLENSBURG   1050 (GOOD)
GOLDENDALE    599 (FAIR)
TRI-CITIES    421 (FAIR)
WALLA WALLA   410 (FAIR)
YAKIMA        796 (GOOD)
BEND          510 (FAIR)
PRINEVILLE    502 (FAIR)
ENTERPRISE    507 (FAIR)
HERMISTON     402 (FAIR)
JOHN DAY      672 (GOOD)
LA GRANDE     548 (FAIR)
MADRAS        406 (FAIR)
MEACHAM       373 (FAIR)
PENDLETON     457 (FAIR)
REDMOND       510 (FAIR)
SENECA        754 (GOOD)
THE DALLES    560 (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.
$$