455
AUUS46 KPDT 101124
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
424 AM PDT THU APR 10 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 3-6 MPH.          NW 6-10 MPH.
TRANSPORT WINDS               S 3-6 MPH.          W 8-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI APR 11        FAIR.
OUTLOOK FOR SAT APR 12        GOOD.

VENTILATION INDEX (CATEGORY)  25 (POOR).          135 (POOR).
OUTLOOK FOR FRI APR 11        425 (FAIR).
OUTLOOK FOR SAT APR 12        1050 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-6 MPH.         S 11-15 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         SW 14-21 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI APR 11        FAIR.
OUTLOOK FOR SAT APR 12        GOOD.

VENTILATION INDEX (CATEGORY)  25 (POOR).          290 (POOR).
OUTLOOK FOR FRI APR 11        278 (POOR).
OUTLOOK FOR SAT APR 12        1050 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 7-15 MPH.        S 19-25 MPH.
TRANSPORT WINDS               S 9-15 MPH.         S 20-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI APR 11        FAIR.
OUTLOOK FOR SAT APR 12        GOOD.

VENTILATION INDEX (CATEGORY)  102 (POOR).         672 (GOOD).
OUTLOOK FOR FRI APR 11        237 (POOR).
OUTLOOK FOR SAT APR 12        1050 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 7-13 MPH.        W 7-15 MPH.
TRANSPORT WINDS               S 7-13 MPH.         W 9-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI APR 11        FAIR.
OUTLOOK FOR SAT APR 12        GOOD.

VENTILATION INDEX (CATEGORY)  35 (POOR).          186 (POOR).
OUTLOOK FOR FRI APR 11        337 (FAIR).
OUTLOOK FOR SAT APR 12        1048 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      343 (FAIR)
ELLENSBURG    362 (FAIR)
GOLDENDALE    238 (POOR)
TRI-CITIES    136 (POOR)
WALLA WALLA   125 (POOR)
YAKIMA        353 (FAIR)
BEND         1030 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE    485 (FAIR)
HERMISTON     123 (POOR)
JOHN DAY     1050 (GOOD)
LA GRANDE     670 (GOOD)
MADRAS        904 (GOOD)
MEACHAM       462 (FAIR)
PENDLETON     137 (POOR)
REDMOND      1050 (GOOD)
SENECA        865 (GOOD)
THE DALLES    127 (POOR)

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.
$$