556
AUUS46 KPDT 081325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST SAT NOV  8 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 2-6 MPH.          N 5-9 MPH.
TRANSPORT WINDS               SE 3-6 MPH.         NE 7-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN NOV 9         POOR.
OUTLOOK FOR MON NOV 10        FAIR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          108 (POOR).
OUTLOOK FOR SUN NOV 9         45 (POOR).
OUTLOOK FOR MON NOV 10        93 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-4 MPH.         NE 3-7 MPH.
TRANSPORT WINDS               N 2-5 MPH.          NE 4-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN NOV 9         POOR.
OUTLOOK FOR MON NOV 10        POOR.

VENTILATION INDEX (CATEGORY)  27 (POOR).          87 (POOR).
OUTLOOK FOR SUN NOV 9         39 (POOR).
OUTLOOK FOR MON NOV 10        55 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 2-4 MPH.          S 3-7 MPH.
TRANSPORT WINDS               SE 4-7 MPH.         S 10-13 MPH.
MIXING HEIGHT                 4000 FT MSL.        6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN NOV 9         GOOD.
OUTLOOK FOR MON NOV 10        FAIR.

VENTILATION INDEX (CATEGORY)  68 (POOR).          271 (POOR).
OUTLOOK FOR SUN NOV 9         377 (FAIR).
OUTLOOK FOR MON NOV 10        269 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-8 MPH.         N 3-6 MPH.
TRANSPORT WINDS               SE 6-11 MPH.        NE 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN NOV 9         POOR.
OUTLOOK FOR MON NOV 10        FAIR.

VENTILATION INDEX (CATEGORY)  45 (POOR).          83 (POOR).
OUTLOOK FOR SUN NOV 9         49 (POOR).
OUTLOOK FOR MON NOV 10        140 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      303 (FAIR)
ELLENSBURG    140 (POOR)
GOLDENDALE    200 (POOR)
TRI-CITIES    126 (POOR)
WALLA WALLA    74 (POOR)
YAKIMA         84 (POOR)
BEND          107 (POOR)
PRINEVILLE    228 (POOR)
ENTERPRISE     84 (POOR)
HERMISTON     131 (POOR)
JOHN DAY      227 (POOR)
LA GRANDE     269 (POOR)
MADRAS         60 (POOR)
MEACHAM       116 (POOR)
PENDLETON     114 (POOR)
REDMOND       106 (POOR)
SENECA        196 (POOR)
THE DALLES    262 (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.
$$