945
AUUS46 KPDT 191126
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
426 AM PDT SAT APR 19 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 8-15 MPH.         SW 15-21 MPH.
TRANSPORT WINDS               SW 8-15 MPH.        W 16-23 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 20        GOOD.
OUTLOOK FOR MON APR 21        GOOD.

VENTILATION INDEX (CATEGORY)  63 (POOR).          602 (GOOD).
OUTLOOK FOR SUN APR 20        736 (GOOD).
OUTLOOK FOR MON APR 21        859 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 5-9 MPH.         W 13-17 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         W 14-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 20        GOOD.
OUTLOOK FOR MON APR 21        FAIR.

VENTILATION INDEX (CATEGORY)  43 (POOR).          572 (FAIR).
OUTLOOK FOR SUN APR 20        554 (FAIR).
OUTLOOK FOR MON APR 21        591 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-9 MPH.          W 10-12 MPH.
TRANSPORT WINDS               S 5-9 MPH.          W 12-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN APR 20        GOOD.
OUTLOOK FOR MON APR 21        GOOD.

VENTILATION INDEX (CATEGORY)  59 (POOR).          528 (FAIR).
OUTLOOK FOR SUN APR 20        724 (GOOD).
OUTLOOK FOR MON APR 21        851 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 9-16 MPH.         SW 14-19 MPH.
TRANSPORT WINDS               SW 9-16 MPH.        W 16-21 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SUN APR 20        GOOD.
OUTLOOK FOR MON APR 21        GOOD.

VENTILATION INDEX (CATEGORY)  92 (POOR).          557 (FAIR).
OUTLOOK FOR SUN APR 20        796 (GOOD).
OUTLOOK FOR MON APR 21        887 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      743 (GOOD)
ELLENSBURG    843 (GOOD)
GOLDENDALE    715 (GOOD)
TRI-CITIES    529 (FAIR)
WALLA WALLA   451 (FAIR)
YAKIMA        678 (GOOD)
BEND          510 (FAIR)
PRINEVILLE    676 (GOOD)
ENTERPRISE    562 (FAIR)
HERMISTON     593 (FAIR)
JOHN DAY      709 (GOOD)
LA GRANDE     661 (GOOD)
MADRAS        581 (FAIR)
MEACHAM       441 (FAIR)
PENDLETON     655 (GOOD)
REDMOND       701 (GOOD)
SENECA        678 (GOOD)
THE DALLES    901 (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.
$$