750
AUUS46 KPDT 121225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE AUG 12 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-6 MPH.          NW 6-8 MPH.
TRANSPORT WINDS               NW 5-11 MPH.        NW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 13        GOOD.
OUTLOOK FOR THU AUG 14        FAIR.

VENTILATION INDEX (CATEGORY)  45 (POOR).          263 (POOR).
OUTLOOK FOR WED AUG 13        989 (GOOD).
OUTLOOK FOR THU AUG 14        705 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         S 6-9 MPH.
TRANSPORT WINDS               NW 6-11 MPH.        W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 13        GOOD.
OUTLOOK FOR THU AUG 14        FAIR.

VENTILATION INDEX (CATEGORY)  79 (POOR).          349 (FAIR).
OUTLOOK FOR WED AUG 13        1011 (GOOD).
OUTLOOK FOR THU AUG 14        344 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 1-3 MPH.         NW 5-6 MPH.
TRANSPORT WINDS               NW 2-4 MPH.         W 9-11 MPH.
MIXING HEIGHT                 4000 FT MSL.        13000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED AUG 13        GOOD.
OUTLOOK FOR THU AUG 14        GOOD.

VENTILATION INDEX (CATEGORY)  44 (POOR).          595 (FAIR).
OUTLOOK FOR WED AUG 13        1048 (GOOD).
OUTLOOK FOR THU AUG 14        602 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-7 MPH.          NW 7-10 MPH.
TRANSPORT WINDS               S 4-7 MPH.          NW 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 13        GOOD.
OUTLOOK FOR THU AUG 14        GOOD.

VENTILATION INDEX (CATEGORY)  40 (POOR).          375 (FAIR).
OUTLOOK FOR WED AUG 13        1048 (GOOD).
OUTLOOK FOR THU AUG 14        731 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      613 (GOOD)
ELLENSBURG    616 (GOOD)
GOLDENDALE    487 (FAIR)
TRI-CITIES    253 (POOR)
WALLA WALLA   304 (FAIR)
YAKIMA        362 (FAIR)
BEND          613 (GOOD)
PRINEVILLE    592 (FAIR)
ENTERPRISE    777 (GOOD)
HERMISTON     194 (POOR)
JOHN DAY      991 (GOOD)
LA GRANDE     612 (GOOD)
MADRAS        387 (FAIR)
MEACHAM       435 (FAIR)
PENDLETON     272 (POOR)
REDMOND       582 (FAIR)
SENECA       1050 (GOOD)
THE DALLES    230 (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.
$$