270
AUUS46 KPDT 101225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN AUG 10 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 3-7 MPH.          N 4-7 MPH.
TRANSPORT WINDS               S 3-7 MPH.          N 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON AUG 11        FAIR.
OUTLOOK FOR TUE AUG 12        FAIR.

VENTILATION INDEX (CATEGORY)  35 (POOR).          299 (POOR).
OUTLOOK FOR MON AUG 11        272 (POOR).
OUTLOOK FOR TUE AUG 12        404 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         SE 3-6 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         NW 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON AUG 11        POOR.
OUTLOOK FOR TUE AUG 12        FAIR.

VENTILATION INDEX (CATEGORY)  56 (POOR).          173 (POOR).
OUTLOOK FOR MON AUG 11        228 (POOR).
OUTLOOK FOR TUE AUG 12        340 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-3 MPH.         N 7-9 MPH.
TRANSPORT WINDS               N 5-6 MPH.          N 8-11 MPH.
MIXING HEIGHT                 4000 FT MSL.        11000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON AUG 11        FAIR.
OUTLOOK FOR TUE AUG 12        GOOD.

VENTILATION INDEX (CATEGORY)  84 (POOR).          591 (FAIR).
OUTLOOK FOR MON AUG 11        210 (POOR).
OUTLOOK FOR TUE AUG 12        676 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-7 MPH.         NW 6-8 MPH.
TRANSPORT WINDS               S 4-7 MPH.          N 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON AUG 11        FAIR.
OUTLOOK FOR TUE AUG 12        GOOD.

VENTILATION INDEX (CATEGORY)  39 (POOR).          412 (FAIR).
OUTLOOK FOR MON AUG 11        352 (FAIR).
OUTLOOK FOR TUE AUG 12        535 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      162 (POOR)
ELLENSBURG     96 (POOR)
GOLDENDALE    338 (FAIR)
TRI-CITIES    224 (POOR)
WALLA WALLA   330 (FAIR)
YAKIMA         56 (POOR)
BEND          327 (FAIR)
PRINEVILLE    360 (FAIR)
ENTERPRISE    464 (FAIR)
HERMISTON     233 (POOR)
JOHN DAY      331 (FAIR)
LA GRANDE     558 (FAIR)
MADRAS        466 (FAIR)
MEACHAM       362 (FAIR)
PENDLETON     367 (FAIR)
REDMOND       350 (FAIR)
SENECA        320 (FAIR)
THE DALLES    312 (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.
$$