246
AUUS46 KPDT 111225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON AUG 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                 S 3-8 MPH.          NW 6-9 MPH.
TRANSPORT WINDS               SW 5-9 MPH.         W 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE AUG 12        FAIR.
OUTLOOK FOR WED AUG 13        GOOD.

VENTILATION INDEX (CATEGORY)  44 (POOR).          373 (FAIR).
OUTLOOK FOR TUE AUG 12        253 (POOR).
OUTLOOK FOR WED AUG 13        1049 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         E 3-6 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        NW 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE AUG 12        FAIR.
OUTLOOK FOR WED AUG 13        GOOD.

VENTILATION INDEX (CATEGORY)  70 (POOR).          267 (POOR).
OUTLOOK FOR TUE AUG 12        322 (FAIR).
OUTLOOK FOR WED AUG 13        1044 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-5 MPH.          NW 4-5 MPH.
TRANSPORT WINDS               S 3-6 MPH.          NW 6-8 MPH.
MIXING HEIGHT                 4000 FT MSL.        11500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE AUG 12        GOOD.
OUTLOOK FOR WED AUG 13        GOOD.

VENTILATION INDEX (CATEGORY)  49 (POOR).          424 (FAIR).
OUTLOOK FOR TUE AUG 12        546 (FAIR).
OUTLOOK FOR WED AUG 13        1050 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-10 MPH.         NW 6-10 MPH.
TRANSPORT WINDS               S 6-10 MPH.         W 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE AUG 12        FAIR.
OUTLOOK FOR WED AUG 13        GOOD.

VENTILATION INDEX (CATEGORY)  77 (POOR).          473 (FAIR).
OUTLOOK FOR TUE AUG 12        345 (FAIR).
OUTLOOK FOR WED AUG 13        1050 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       73 (POOR)
ELLENSBURG    274 (POOR)
GOLDENDALE    299 (POOR)
TRI-CITIES    352 (FAIR)
WALLA WALLA   463 (FAIR)
YAKIMA        253 (POOR)
BEND          511 (FAIR)
PRINEVILLE    398 (FAIR)
ENTERPRISE    483 (FAIR)
HERMISTON     286 (POOR)
JOHN DAY      393 (FAIR)
LA GRANDE     443 (FAIR)
MADRAS        354 (FAIR)
MEACHAM       419 (FAIR)
PENDLETON     412 (FAIR)
REDMOND       381 (FAIR)
SENECA        438 (FAIR)
THE DALLES    204 (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.
$$