110
AUUS46 KPDT 031225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT OCT  3 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 1-4 MPH.          N 5-9 MPH.
TRANSPORT WINDS               E 3-6 MPH.          NE 6-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN OCT 4         POOR.
OUTLOOK FOR MON OCT 5         FAIR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          142 (POOR).
OUTLOOK FOR SUN OCT 4         104 (POOR).
OUTLOOK FOR MON OCT 5         229 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 0-3 MPH.         NE 2-6 MPH.
TRANSPORT WINDS               NW 4-7 MPH.         E 4-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN OCT 4         POOR.
OUTLOOK FOR MON OCT 5         POOR.

VENTILATION INDEX (CATEGORY)  28 (POOR).          149 (POOR).
OUTLOOK FOR SUN OCT 4         68 (POOR).
OUTLOOK FOR MON OCT 5         95 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 0-2 MPH.          SE 0-3 MPH.
TRANSPORT WINDS               N 3-6 MPH.          S 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN OCT 4         FAIR.
OUTLOOK FOR MON OCT 5         FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          137 (POOR).
OUTLOOK FOR SUN OCT 4         248 (POOR).
OUTLOOK FOR MON OCT 5         294 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-7 MPH.         N 4-8 MPH.
TRANSPORT WINDS               SE 5-10 MPH.        N 5-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN OCT 4         POOR.
OUTLOOK FOR MON OCT 5         FAIR.

VENTILATION INDEX (CATEGORY)  29 (POOR).          100 (POOR).
OUTLOOK FOR SUN OCT 4         99 (POOR).
OUTLOOK FOR MON OCT 5         294 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      336 (FAIR)
ELLENSBURG    229 (POOR)
GOLDENDALE    251 (POOR)
TRI-CITIES    147 (POOR)
WALLA WALLA    73 (POOR)
YAKIMA        164 (POOR)
BEND           75 (POOR)
PRINEVILLE    151 (POOR)
ENTERPRISE    116 (POOR)
HERMISTON     189 (POOR)
JOHN DAY      351 (FAIR)
LA GRANDE     135 (POOR)
MADRAS        118 (POOR)
MEACHAM        96 (POOR)
PENDLETON     151 (POOR)
REDMOND        48 (POOR)
SENECA        433 (FAIR)
THE DALLES    277 (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.
$$