143
AUUS46 KPDT 131225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN SEP 13 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 14-27 MPH.       SW 17-21 MPH.
TRANSPORT WINDS               SW 17-32 MPH.       SW 22-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR MON SEP 14        FAIR.
OUTLOOK FOR TUE SEP 15        FAIR.

VENTILATION INDEX (CATEGORY)  312 (FAIR).         835 (GOOD).
OUTLOOK FOR MON SEP 14        372 (FAIR).
OUTLOOK FOR TUE SEP 15        134 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 8-15 MPH.         SW 8-15 MPH.
TRANSPORT WINDS               W 11-18 MPH.        W 12-21 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR MON SEP 14        FAIR.
OUTLOOK FOR TUE SEP 15        POOR.

VENTILATION INDEX (CATEGORY)  124 (POOR).         314 (FAIR).
OUTLOOK FOR MON SEP 14        121 (POOR).
OUTLOOK FOR TUE SEP 15        127 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 8-15 MPH.         W 9-13 MPH.
TRANSPORT WINDS               W 10-19 MPH.        W 16-19 MPH.
MIXING HEIGHT                 4000 FT MSL.        8000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON SEP 14        FAIR.
OUTLOOK FOR TUE SEP 15        FAIR.

VENTILATION INDEX (CATEGORY)  255 (POOR).         736 (GOOD).
OUTLOOK FOR MON SEP 14        227 (POOR).
OUTLOOK FOR TUE SEP 15        215 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 13-22 MPH.       SW 15-20 MPH.
TRANSPORT WINDS               SW 18-26 MPH.       SW 18-25 MPH.
MIXING HEIGHT                 2000 FT MSL.        5000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR MON SEP 14        FAIR.
OUTLOOK FOR TUE SEP 15        FAIR.

VENTILATION INDEX (CATEGORY)  343 (FAIR).         825 (GOOD).
OUTLOOK FOR MON SEP 14        364 (FAIR).
OUTLOOK FOR TUE SEP 15        166 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      325 (FAIR)
ELLENSBURG    349 (FAIR)
GOLDENDALE    527 (FAIR)
TRI-CITIES    662 (GOOD)
WALLA WALLA   849 (GOOD)
YAKIMA        113 (POOR)
BEND          748 (GOOD)
PRINEVILLE    712 (GOOD)
ENTERPRISE    708 (GOOD)
HERMISTON     750 (GOOD)
JOHN DAY      781 (GOOD)
LA GRANDE     859 (GOOD)
MADRAS        770 (GOOD)
MEACHAM       545 (FAIR)
PENDLETON     873 (GOOD)
REDMOND       704 (GOOD)
SENECA        851 (GOOD)
THE DALLES    602 (GOOD)

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.
$$