451
AUUS46 KPDT 111225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI JUL 11 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 3-7 MPH.         N 5-9 MPH.
TRANSPORT WINDS               W 6-10 MPH.         N 5-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUL 12        FAIR.
OUTLOOK FOR SUN JUL 13        FAIR.

VENTILATION INDEX (CATEGORY)  82 (POOR).          380 (FAIR).
OUTLOOK FOR SAT JUL 12        400 (FAIR).
OUTLOOK FOR SUN JUL 13        549 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 4-8 MPH.         W 5-7 MPH.
TRANSPORT WINDS               NW 7-13 MPH.        NW 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SAT JUL 12        POOR.
OUTLOOK FOR SUN JUL 13        GOOD.

VENTILATION INDEX (CATEGORY)  134 (POOR).         284 (POOR).
OUTLOOK FOR SAT JUL 12        245 (POOR).
OUTLOOK FOR SUN JUL 13        777 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-5 MPH.         NW 9-12 MPH.
TRANSPORT WINDS               NW 5-7 MPH.         N 9-12 MPH.
MIXING HEIGHT                 4000 FT MSL.        11000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT JUL 12        GOOD.
OUTLOOK FOR SUN JUL 13        GOOD.

VENTILATION INDEX (CATEGORY)  120 (POOR).         632 (GOOD).
OUTLOOK FOR SAT JUL 12        253 (POOR).
OUTLOOK FOR SUN JUL 13        495 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-8 MPH.          NW 7-9 MPH.
TRANSPORT WINDS               SW 6-10 MPH.        N 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUL 12        FAIR.
OUTLOOK FOR SUN JUL 13        FAIR.

VENTILATION INDEX (CATEGORY)  82 (POOR).          394 (FAIR).
OUTLOOK FOR SAT JUL 12        372 (FAIR).
OUTLOOK FOR SUN JUL 13        528 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      434 (FAIR)
ELLENSBURG    448 (FAIR)
GOLDENDALE    321 (FAIR)
TRI-CITIES    359 (FAIR)
WALLA WALLA   319 (FAIR)
YAKIMA        238 (POOR)
BEND          268 (POOR)
PRINEVILLE    422 (FAIR)
ENTERPRISE    396 (FAIR)
HERMISTON     328 (FAIR)
JOHN DAY      352 (FAIR)
LA GRANDE     600 (FAIR)
MADRAS        423 (FAIR)
MEACHAM       300 (POOR)
PENDLETON     394 (FAIR)
REDMOND       417 (FAIR)
SENECA        370 (FAIR)
THE DALLES    275 (POOR)

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.
$$