754
AUUS46 KPDT 151225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT AUG 15 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 1-5 MPH.         N 4-7 MPH.
TRANSPORT WINDS               W 4-8 MPH.          E 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN AUG 16        FAIR.
OUTLOOK FOR MON AUG 17        FAIR.

VENTILATION INDEX (CATEGORY)  37 (POOR).          186 (POOR).
OUTLOOK FOR SUN AUG 16        312 (FAIR).
OUTLOOK FOR MON AUG 17        309 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-5 MPH.         E 3-6 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         SE 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN AUG 16        FAIR.
OUTLOOK FOR MON AUG 17        FAIR.

VENTILATION INDEX (CATEGORY)  48 (POOR).          303 (FAIR).
OUTLOOK FOR SUN AUG 16        420 (FAIR).
OUTLOOK FOR MON AUG 17        229 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 0-2 MPH.          NW 3-5 MPH.
TRANSPORT WINDS               NE 3-6 MPH.         SW 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN AUG 16        GOOD.
OUTLOOK FOR MON AUG 17        GOOD.

VENTILATION INDEX (CATEGORY)  29 (POOR).          286 (POOR).
OUTLOOK FOR SUN AUG 16        322 (FAIR).
OUTLOOK FOR MON AUG 17        212 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-6 MPH.          NE 4-8 MPH.
TRANSPORT WINDS               S 6-9 MPH.          E 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN AUG 16        FAIR.
OUTLOOK FOR MON AUG 17        FAIR.

VENTILATION INDEX (CATEGORY)  36 (POOR).          165 (POOR).
OUTLOOK FOR SUN AUG 16        339 (FAIR).
OUTLOOK FOR MON AUG 17        276 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      243 (POOR)
ELLENSBURG    265 (POOR)
GOLDENDALE    234 (POOR)
TRI-CITIES    280 (POOR)
WALLA WALLA    41 (POOR)
YAKIMA        337 (FAIR)
BEND          342 (FAIR)
PRINEVILLE    514 (FAIR)
ENTERPRISE    333 (FAIR)
HERMISTON     152 (POOR)
JOHN DAY     1050 (GOOD)
LA GRANDE     223 (POOR)
MADRAS        339 (FAIR)
MEACHAM       330 (FAIR)
PENDLETON     201 (POOR)
REDMOND       474 (FAIR)
SENECA       1050 (GOOD)
THE DALLES    356 (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.
$$