859
AUUS46 KPDT 121225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT SEP 12 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.          N 6-10 MPH.
TRANSPORT WINDS               SW 3-6 MPH.         N 6-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN SEP 13        GOOD.
OUTLOOK FOR MON SEP 14        FAIR.

VENTILATION INDEX (CATEGORY)  29 (POOR).          192 (POOR).
OUTLOOK FOR SUN SEP 13        610 (GOOD).
OUTLOOK FOR MON SEP 14        405 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 0-3 MPH.         NE 5-9 MPH.
TRANSPORT WINDS               NW 4-8 MPH.         E 5-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN SEP 13        FAIR.
OUTLOOK FOR MON SEP 14        POOR.

VENTILATION INDEX (CATEGORY)  37 (POOR).          282 (POOR).
OUTLOOK FOR SUN SEP 13        188 (POOR).
OUTLOOK FOR MON SEP 14        101 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 0-2 MPH.          SE 4-9 MPH.
TRANSPORT WINDS               SE 2-4 MPH.         S 12-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN SEP 13        GOOD.
OUTLOOK FOR MON SEP 14        FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          571 (FAIR).
OUTLOOK FOR SUN SEP 13        652 (GOOD).
OUTLOOK FOR MON SEP 14        298 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-6 MPH.          N 7-9 MPH.
TRANSPORT WINDS               S 3-6 MPH.          N 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN SEP 13        GOOD.
OUTLOOK FOR MON SEP 14        FAIR.

VENTILATION INDEX (CATEGORY)  28 (POOR).          133 (POOR).
OUTLOOK FOR SUN SEP 13        659 (GOOD).
OUTLOOK FOR MON SEP 14        408 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      762 (GOOD)
ELLENSBURG    676 (GOOD)
GOLDENDALE    278 (POOR)
TRI-CITIES    175 (POOR)
WALLA WALLA   136 (POOR)
YAKIMA        420 (FAIR)
BEND          578 (FAIR)
PRINEVILLE    434 (FAIR)
ENTERPRISE    497 (FAIR)
HERMISTON     221 (POOR)
JOHN DAY     1050 (GOOD)
LA GRANDE     528 (FAIR)
MADRAS        259 (POOR)
MEACHAM       181 (POOR)
PENDLETON     221 (POOR)
REDMOND       383 (FAIR)
SENECA       1050 (GOOD)
THE DALLES     87 (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.
$$