750
AUUS46 KPDT 011225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON SEP  1 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 4-10 MPH.         NW 4-8 MPH.
TRANSPORT WINDS               SW 8-14 MPH.        W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE SEP 2         POOR.
OUTLOOK FOR WED SEP 3         FAIR.

VENTILATION INDEX (CATEGORY)  82 (POOR).          185 (POOR).
OUTLOOK FOR TUE SEP 2         121 (POOR).
OUTLOOK FOR WED SEP 3         181 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-6 MPH.          SE 3-6 MPH.
TRANSPORT WINDS               NW 4-8 MPH.         S 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE SEP 2         FAIR.
OUTLOOK FOR WED SEP 3         FAIR.

VENTILATION INDEX (CATEGORY)  43 (POOR).          215 (POOR).
OUTLOOK FOR TUE SEP 2         167 (POOR).
OUTLOOK FOR WED SEP 3         217 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-7 MPH.          S 7-10 MPH.
TRANSPORT WINDS               SE 5-10 MPH.        S 18-18 MPH.
MIXING HEIGHT                 4000 FT MSL.        14000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE SEP 2         GOOD.
OUTLOOK FOR WED SEP 3         GOOD.

VENTILATION INDEX (CATEGORY)  100 (POOR).         1049 (GOOD).
OUTLOOK FOR TUE SEP 2         467 (FAIR).
OUTLOOK FOR WED SEP 3         307 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-8 MPH.          N 5-7 MPH.
TRANSPORT WINDS               S 7-12 MPH.         NW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE SEP 2         FAIR.
OUTLOOK FOR WED SEP 3         FAIR.

VENTILATION INDEX (CATEGORY)  78 (POOR).          123 (POOR).
OUTLOOK FOR TUE SEP 2         136 (POOR).
OUTLOOK FOR WED SEP 3         220 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      329 (FAIR)
ELLENSBURG    316 (FAIR)
GOLDENDALE    242 (POOR)
TRI-CITIES    188 (POOR)
WALLA WALLA   135 (POOR)
YAKIMA        233 (POOR)
BEND          939 (GOOD)
PRINEVILLE    901 (GOOD)
ENTERPRISE   1050 (GOOD)
HERMISTON     203 (POOR)
JOHN DAY     1050 (GOOD)
LA GRANDE    1050 (GOOD)
MADRAS        314 (FAIR)
MEACHAM       267 (POOR)
PENDLETON     181 (POOR)
REDMOND       700 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    264 (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.
$$