331
AUUS46 KPDT 161225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN AUG 16 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-10 MPH.         NW 3-7 MPH.
TRANSPORT WINDS               SW 7-12 MPH.        W 4-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON AUG 17        POOR.
OUTLOOK FOR TUE AUG 18        FAIR.

VENTILATION INDEX (CATEGORY)  83 (POOR).          261 (POOR).
OUTLOOK FOR MON AUG 17        220 (POOR).
OUTLOOK FOR TUE AUG 18        539 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 0-5 MPH.         SE 2-6 MPH.
TRANSPORT WINDS               NW 4-9 MPH.         SW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON AUG 17        FAIR.
OUTLOOK FOR TUE AUG 18        FAIR.

VENTILATION INDEX (CATEGORY)  45 (POOR).          353 (FAIR).
OUTLOOK FOR MON AUG 17        271 (POOR).
OUTLOOK FOR TUE AUG 18        341 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 0-2 MPH.         NW 3-4 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         W 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON AUG 17        GOOD.
OUTLOOK FOR TUE AUG 18        GOOD.

VENTILATION INDEX (CATEGORY)  28 (POOR).          306 (FAIR).
OUTLOOK FOR MON AUG 17        277 (POOR).
OUTLOOK FOR TUE AUG 18        493 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 1-7 MPH.          NW 4-6 MPH.
TRANSPORT WINDS               SW 7-13 MPH.        W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON AUG 17        FAIR.
OUTLOOK FOR TUE AUG 18        FAIR.

VENTILATION INDEX (CATEGORY)  75 (POOR).          261 (POOR).
OUTLOOK FOR MON AUG 17        240 (POOR).
OUTLOOK FOR TUE AUG 18        571 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      224 (POOR)
ELLENSBURG    210 (POOR)
GOLDENDALE    439 (FAIR)
TRI-CITIES    224 (POOR)
WALLA WALLA   206 (POOR)
YAKIMA        387 (FAIR)
BEND          359 (FAIR)
PRINEVILLE    438 (FAIR)
ENTERPRISE    329 (FAIR)
HERMISTON     279 (POOR)
JOHN DAY      657 (GOOD)
LA GRANDE     305 (FAIR)
MADRAS        351 (FAIR)
MEACHAM       290 (POOR)
PENDLETON     288 (POOR)
REDMOND       400 (FAIR)
SENECA       1050 (GOOD)
THE DALLES    457 (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.
$$