471
AUUS46 KPDT 111225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT OCT 11 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 12-25 MPH.       SW 19-24 MPH.
TRANSPORT WINDS               SW 14-24 MPH.       W 19-24 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SUN OCT 12        GOOD.
OUTLOOK FOR MON OCT 13        FAIR.

VENTILATION INDEX (CATEGORY)  173 (POOR).         784 (GOOD).
OUTLOOK FOR SUN OCT 12        815 (GOOD).
OUTLOOK FOR MON OCT 13        399 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 6-14 MPH.         W 11-18 MPH.
TRANSPORT WINDS               W 8-15 MPH.         W 14-19 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN OCT 12        FAIR.
OUTLOOK FOR MON OCT 13        GOOD.

VENTILATION INDEX (CATEGORY)  100 (POOR).         687 (GOOD).
OUTLOOK FOR SUN OCT 12        470 (FAIR).
OUTLOOK FOR MON OCT 13        576 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 6-10 MPH.         W 13-14 MPH.
TRANSPORT WINDS               W 9-12 MPH.         W 14-16 MPH.
MIXING HEIGHT                 5000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SUN OCT 12        FAIR.
OUTLOOK FOR MON OCT 13        FAIR.

VENTILATION INDEX (CATEGORY)  241 (POOR).         558 (FAIR).
OUTLOOK FOR SUN OCT 12        495 (FAIR).
OUTLOOK FOR MON OCT 13        212 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 11-24 MPH.       SW 16-23 MPH.
TRANSPORT WINDS               SW 15-22 MPH.       W 19-24 MPH.
MIXING HEIGHT                 2000 FT MSL.        5000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SUN OCT 12        GOOD.
OUTLOOK FOR MON OCT 13        FAIR.

VENTILATION INDEX (CATEGORY)  248 (POOR).         753 (GOOD).
OUTLOOK FOR SUN OCT 12        692 (GOOD).
OUTLOOK FOR MON OCT 13        256 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      850 (GOOD)
ELLENSBURG    895 (GOOD)
GOLDENDALE    790 (GOOD)
TRI-CITIES    706 (GOOD)
WALLA WALLA   706 (GOOD)
YAKIMA        615 (GOOD)
BEND          551 (FAIR)
PRINEVILLE    508 (FAIR)
ENTERPRISE    613 (GOOD)
HERMISTON     830 (GOOD)
JOHN DAY      615 (GOOD)
LA GRANDE     623 (GOOD)
MADRAS        595 (FAIR)
MEACHAM       485 (FAIR)
PENDLETON     870 (GOOD)
REDMOND       495 (FAIR)
SENECA        640 (GOOD)
THE DALLES    820 (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.
$$