898
AUUS46 KPDT 071225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON APR 7 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 7-13 MPH.         SW 15-22 MPH.
TRANSPORT WINDS               S 6-12 MPH.         SW 20-27 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE APR 8         FAIR.
OUTLOOK FOR WED APR 9         FAIR.

VENTILATION INDEX (CATEGORY)  87 (POOR).          832 (GOOD).
OUTLOOK FOR TUE APR 8         854 (GOOD).
OUTLOOK FOR WED APR 9         439 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-10 MPH.         SW 18-25 MPH.
TRANSPORT WINDS               S 5-10 MPH.         SW 28-34 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE APR 8         GOOD.
OUTLOOK FOR WED APR 9         FAIR.

VENTILATION INDEX (CATEGORY)  94 (POOR).          1048 (GOOD).
OUTLOOK FOR TUE APR 8         834 (GOOD).
OUTLOOK FOR WED APR 9         291 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 7-12 MPH.         SW 9-11 MPH.
TRANSPORT WINDS               S 11-16 MPH.        SW 16-21 MPH.
MIXING HEIGHT                 4000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE APR 8         GOOD.
OUTLOOK FOR WED APR 9         GOOD.

VENTILATION INDEX (CATEGORY)  153 (POOR).         643 (GOOD).
OUTLOOK FOR TUE APR 8         810 (GOOD).
OUTLOOK FOR WED APR 9         507 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-12 MPH.         SW 12-21 MPH.
TRANSPORT WINDS               S 8-12 MPH.         SW 16-22 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE APR 8         GOOD.
OUTLOOK FOR WED APR 9         FAIR.

VENTILATION INDEX (CATEGORY)  99 (POOR).          568 (FAIR).
OUTLOOK FOR TUE APR 8         904 (GOOD).
OUTLOOK FOR WED APR 9         467 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      612 (GOOD)
ELLENSBURG    863 (GOOD)
GOLDENDALE    694 (GOOD)
TRI-CITIES   1046 (GOOD)
WALLA WALLA   493 (FAIR)
YAKIMA       1050 (GOOD)
BEND         1050 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE    652 (GOOD)
HERMISTON     956 (GOOD)
JOHN DAY     1050 (GOOD)
LA GRANDE     823 (GOOD)
MADRAS       1050 (GOOD)
MEACHAM       549 (FAIR)
PENDLETON     498 (FAIR)
REDMOND      1050 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    564 (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.
$$