837
AUUS46 KPDT 251225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE AUG 25 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 1-5 MPH.          NW 3-7 MPH.
TRANSPORT WINDS               SW 3-6 MPH.         W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 26        FAIR.
OUTLOOK FOR THU AUG 27        FAIR.

VENTILATION INDEX (CATEGORY)  30 (POOR).          186 (POOR).
OUTLOOK FOR WED AUG 26        486 (FAIR).
OUTLOOK FOR THU AUG 27        568 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-5 MPH.         SE 2-6 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         S 5-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED AUG 26        GOOD.
OUTLOOK FOR THU AUG 27        GOOD.

VENTILATION INDEX (CATEGORY)  46 (POOR).          167 (POOR).
OUTLOOK FOR WED AUG 26        538 (FAIR).
OUTLOOK FOR THU AUG 27        675 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-5 MPH.         S 9-12 MPH.
TRANSPORT WINDS               SE 4-7 MPH.         S 15-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       13500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED AUG 26        GOOD.
OUTLOOK FOR THU AUG 27        GOOD.

VENTILATION INDEX (CATEGORY)  66 (POOR).          1050 (GOOD).
OUTLOOK FOR WED AUG 26        867 (GOOD).
OUTLOOK FOR THU AUG 27        330 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-6 MPH.          NW 4-8 MPH.
TRANSPORT WINDS               S 5-9 MPH.          SW 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 26        FAIR.
OUTLOOK FOR THU AUG 27        FAIR.

VENTILATION INDEX (CATEGORY)  35 (POOR).          297 (POOR).
OUTLOOK FOR WED AUG 26        445 (FAIR).
OUTLOOK FOR THU AUG 27        405 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      600 (FAIR)
ELLENSBURG    504 (FAIR)
GOLDENDALE    230 (POOR)
TRI-CITIES    108 (POOR)
WALLA WALLA   180 (POOR)
YAKIMA        293 (POOR)
BEND         1050 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE   1050 (GOOD)
HERMISTON     178 (POOR)
JOHN DAY     1050 (GOOD)
LA GRANDE    1050 (GOOD)
MADRAS        865 (GOOD)
MEACHAM       671 (GOOD)
PENDLETON     243 (POOR)
REDMOND      1050 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    134 (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.
$$