472
AUUS46 KPDT 211225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT JUN 21 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 15-28 MPH.       SW 15-20 MPH.
TRANSPORT WINDS               SW 20-29 MPH.       W 19-23 MPH.
MIXING HEIGHT                 2000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SUN JUN 22        POOR.
OUTLOOK FOR MON JUN 23        FAIR.

VENTILATION INDEX (CATEGORY)  557 (FAIR).         1049 (GOOD).
OUTLOOK FOR SUN JUN 22        293 (POOR).
OUTLOOK FOR MON JUN 23        417 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 7-14 MPH.         W 10-14 MPH.
TRANSPORT WINDS               W 8-15 MPH.         W 13-18 MPH.
MIXING HEIGHT                 2000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN JUN 22        POOR.
OUTLOOK FOR MON JUN 23        POOR.

VENTILATION INDEX (CATEGORY)  265 (POOR).         836 (GOOD).
OUTLOOK FOR SUN JUN 22        331 (FAIR).
OUTLOOK FOR MON JUN 23        321 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 8-11 MPH.         W 11-13 MPH.
TRANSPORT WINDS               W 10-14 MPH.        W 14-16 MPH.
MIXING HEIGHT                 5500 FT MSL.        9500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SUN JUN 22        FAIR.
OUTLOOK FOR MON JUN 23        FAIR.

VENTILATION INDEX (CATEGORY)  376 (FAIR).         823 (GOOD).
OUTLOOK FOR SUN JUN 22        325 (FAIR).
OUTLOOK FOR MON JUN 23        311 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 16-27 MPH.       W 14-19 MPH.
TRANSPORT WINDS               SW 20-25 MPH.       W 20-22 MPH.
MIXING HEIGHT                 3000 FT MSL.        7000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SUN JUN 22        FAIR.
OUTLOOK FOR MON JUN 23        FAIR.

VENTILATION INDEX (CATEGORY)  618 (GOOD).         1026 (GOOD).
OUTLOOK FOR SUN JUN 22        268 (POOR).
OUTLOOK FOR MON JUN 23        374 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      521 (FAIR)
ELLENSBURG    671 (GOOD)
GOLDENDALE    841 (GOOD)
TRI-CITIES   1045 (GOOD)
WALLA WALLA  1050 (GOOD)
YAKIMA        643 (GOOD)
BEND          715 (GOOD)
PRINEVILLE    829 (GOOD)
ENTERPRISE    880 (GOOD)
HERMISTON    1050 (GOOD)
JOHN DAY      689 (GOOD)
LA GRANDE     879 (GOOD)
MADRAS        815 (GOOD)
MEACHAM       718 (GOOD)
PENDLETON    1050 (GOOD)
REDMOND       858 (GOOD)
SENECA        678 (GOOD)
THE DALLES    944 (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.
$$