019
AUUS46 KPDT 261105
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
405 AM PDT SAT APR 26 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 5-10 MPH.        NW 6-12 MPH.
TRANSPORT WINDS               SW 7-13 MPH.        NW 7-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN APR 27        FAIR.
OUTLOOK FOR MON APR 28        FAIR.

VENTILATION INDEX (CATEGORY)  66 (POOR).          364 (FAIR).
OUTLOOK FOR SUN APR 27        496 (FAIR).
OUTLOOK FOR MON APR 28        503 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 5-9 MPH.         NW 7-14 MPH.
TRANSPORT WINDS               NW 7-13 MPH.        N 8-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       11000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 27        GOOD.
OUTLOOK FOR MON APR 28        FAIR.

VENTILATION INDEX (CATEGORY)  53 (POOR).          678 (GOOD).
OUTLOOK FOR SUN APR 27        586 (FAIR).
OUTLOOK FOR MON APR 28        255 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-4 MPH.          N 7-13 MPH.
TRANSPORT WINDS               S 4-6 MPH.          N 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 27        GOOD.
OUTLOOK FOR MON APR 28        GOOD.

VENTILATION INDEX (CATEGORY)  47 (POOR).          205 (POOR).
OUTLOOK FOR SUN APR 27        496 (FAIR).
OUTLOOK FOR MON APR 28        461 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 4-8 MPH.         NW 6-12 MPH.
TRANSPORT WINDS               SW 7-11 MPH.        W 8-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN APR 27        FAIR.
OUTLOOK FOR MON APR 28        FAIR.

VENTILATION INDEX (CATEGORY)  73 (POOR).          334 (FAIR).
OUTLOOK FOR SUN APR 27        436 (FAIR).
OUTLOOK FOR MON APR 28        428 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      657 (GOOD)
ELLENSBURG    907 (GOOD)
GOLDENDALE    347 (FAIR)
TRI-CITIES    340 (FAIR)
WALLA WALLA   307 (FAIR)
YAKIMA        916 (GOOD)
BEND          618 (GOOD)
PRINEVILLE    596 (FAIR)
ENTERPRISE    166 (POOR)
HERMISTON     385 (FAIR)
JOHN DAY      416 (FAIR)
LA GRANDE     333 (FAIR)
MADRAS        468 (FAIR)
MEACHAM       282 (POOR)
PENDLETON     394 (FAIR)
REDMOND       560 (FAIR)
SENECA        417 (FAIR)
THE DALLES    467 (FAIR)

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.
$$