328
AUUS46 KPDT 061225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON OCT  6 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-6 MPH.         N 6-10 MPH.
TRANSPORT WINDS               SE 3-7 MPH.         NE 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE OCT 7         POOR.
OUTLOOK FOR WED OCT 8         FAIR.

VENTILATION INDEX (CATEGORY)  27 (POOR).          186 (POOR).
OUTLOOK FOR TUE OCT 7         73 (POOR).
OUTLOOK FOR WED OCT 8         205 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         E 5-9 MPH.
TRANSPORT WINDS               NW 3-7 MPH.         E 5-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE OCT 7         POOR.
OUTLOOK FOR WED OCT 8         FAIR.

VENTILATION INDEX (CATEGORY)  34 (POOR).          195 (POOR).
OUTLOOK FOR TUE OCT 7         100 (POOR).
OUTLOOK FOR WED OCT 8         194 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 4-7 MPH.          NE 2-3 MPH.
TRANSPORT WINDS               N 4-7 MPH.          E 4-5 MPH.
MIXING HEIGHT                 4000 FT MSL.        7000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE OCT 7         GOOD.
OUTLOOK FOR WED OCT 8         GOOD.

VENTILATION INDEX (CATEGORY)  53 (POOR).          136 (POOR).
OUTLOOK FOR TUE OCT 7         704 (GOOD).
OUTLOOK FOR WED OCT 8         690 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-8 MPH.         N 6-9 MPH.
TRANSPORT WINDS               SE 6-9 MPH.         NE 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE OCT 7         FAIR.
OUTLOOK FOR WED OCT 8         FAIR.

VENTILATION INDEX (CATEGORY)  46 (POOR).          220 (POOR).
OUTLOOK FOR TUE OCT 7         220 (POOR).
OUTLOOK FOR WED OCT 8         357 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      271 (POOR)
ELLENSBURG    192 (POOR)
GOLDENDALE    403 (FAIR)
TRI-CITIES    125 (POOR)
WALLA WALLA   185 (POOR)
YAKIMA        164 (POOR)
BEND          358 (FAIR)
PRINEVILLE    263 (POOR)
ENTERPRISE    169 (POOR)
HERMISTON     174 (POOR)
JOHN DAY      207 (POOR)
LA GRANDE     145 (POOR)
MADRAS        208 (POOR)
MEACHAM       162 (POOR)
PENDLETON     250 (POOR)
REDMOND       273 (POOR)
SENECA        218 (POOR)
THE DALLES    442 (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.
$$