664
AUUS46 KPDT 121225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT JUL 12 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 8-10 MPH.
TRANSPORT WINDS               SW 5-10 MPH.        W 8-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN JUL 13        FAIR.
OUTLOOK FOR MON JUL 14        GOOD.

VENTILATION INDEX (CATEGORY)  87 (POOR).          440 (FAIR).
OUTLOOK FOR SUN JUL 13        345 (FAIR).
OUTLOOK FOR MON JUL 14        637 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          NW 4-7 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN JUL 13        FAIR.
OUTLOOK FOR MON JUL 14        FAIR.

VENTILATION INDEX (CATEGORY)  86 (POOR).          339 (FAIR).
OUTLOOK FOR SUN JUL 13        421 (FAIR).
OUTLOOK FOR MON JUL 14        480 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-3 MPH.         NW 6-8 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         NW 7-9 MPH.
MIXING HEIGHT                 4000 FT MSL.        9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN JUL 13        GOOD.
OUTLOOK FOR MON JUL 14        GOOD.

VENTILATION INDEX (CATEGORY)  70 (POOR).          401 (FAIR).
OUTLOOK FOR SUN JUL 13        368 (FAIR).
OUTLOOK FOR MON JUL 14        720 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-11 MPH.         W 7-13 MPH.
TRANSPORT WINDS               S 7-12 MPH.         W 7-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN JUL 13        FAIR.
OUTLOOK FOR MON JUL 14        GOOD.

VENTILATION INDEX (CATEGORY)  102 (POOR).         425 (FAIR).
OUTLOOK FOR SUN JUL 13        342 (FAIR).
OUTLOOK FOR MON JUL 14        722 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      585 (FAIR)
ELLENSBURG    918 (GOOD)
GOLDENDALE    502 (FAIR)
TRI-CITIES    402 (FAIR)
WALLA WALLA   390 (FAIR)
YAKIMA        381 (FAIR)
BEND          239 (POOR)
PRINEVILLE    277 (POOR)
ENTERPRISE    384 (FAIR)
HERMISTON     374 (FAIR)
JOHN DAY      300 (POOR)
LA GRANDE     416 (FAIR)
MADRAS        256 (POOR)
MEACHAM       330 (FAIR)
PENDLETON     411 (FAIR)
REDMOND       262 (POOR)
SENECA        353 (FAIR)
THE DALLES    521 (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.
$$