152
AUUS46 KPDT 281225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT JUN 28 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 7-13 MPH.        W 8-11 MPH.
TRANSPORT WINDS               SW 8-14 MPH.        W 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN JUN 29        FAIR.
OUTLOOK FOR MON JUN 30        FAIR.

VENTILATION INDEX (CATEGORY)  193 (POOR).         540 (FAIR).
OUTLOOK FOR SUN JUN 29        280 (POOR).
OUTLOOK FOR MON JUN 30        309 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-6 MPH.          NW 4-7 MPH.
TRANSPORT WINDS               W 4-8 MPH.          W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN JUN 29        POOR.
OUTLOOK FOR MON JUN 30        POOR.

VENTILATION INDEX (CATEGORY)  127 (POOR).         408 (FAIR).
OUTLOOK FOR SUN JUN 29        171 (POOR).
OUTLOOK FOR MON JUN 30        200 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 2-4 MPH.         NW 8-11 MPH.
TRANSPORT WINDS               W 4-7 MPH.          W 12-13 MPH.
MIXING HEIGHT                 4500 FT MSL.        10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN JUN 29        GOOD.
OUTLOOK FOR MON JUN 30        GOOD.

VENTILATION INDEX (CATEGORY)  149 (POOR).         678 (GOOD).
OUTLOOK FOR SUN JUN 29        336 (FAIR).
OUTLOOK FOR MON JUN 30        331 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 6-15 MPH.        W 8-11 MPH.
TRANSPORT WINDS               SW 9-15 MPH.        W 9-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SUN JUN 29        FAIR.
OUTLOOK FOR MON JUN 30        FAIR.

VENTILATION INDEX (CATEGORY)  234 (POOR).         608 (GOOD).
OUTLOOK FOR SUN JUN 29        291 (POOR).
OUTLOOK FOR MON JUN 30        270 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      651 (GOOD)
ELLENSBURG    861 (GOOD)
GOLDENDALE    611 (GOOD)
TRI-CITIES    526 (FAIR)
WALLA WALLA   540 (FAIR)
YAKIMA        447 (FAIR)
BEND          351 (FAIR)
PRINEVILLE    411 (FAIR)
ENTERPRISE    639 (GOOD)
HERMISTON     423 (FAIR)
JOHN DAY      614 (GOOD)
LA GRANDE     738 (GOOD)
MADRAS        360 (FAIR)
MEACHAM       546 (FAIR)
PENDLETON     713 (GOOD)
REDMOND       435 (FAIR)
SENECA        576 (FAIR)
THE DALLES    770 (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.
$$