763
AUUS46 KPDT 111111
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
411 AM PDT SUN MAY 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 5-10 MPH.        W 7-13 MPH.
TRANSPORT WINDS               SW 6-12 MPH.        W 8-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON MAY 12        GOOD.
OUTLOOK FOR TUE MAY 13        FAIR.

VENTILATION INDEX (CATEGORY)  79 (POOR).          346 (FAIR).
OUTLOOK FOR MON MAY 12        717 (GOOD).
OUTLOOK FOR TUE MAY 13        556 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-6 MPH.          SW 7-14 MPH.
TRANSPORT WINDS               W 4-9 MPH.          SW 12-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON MAY 12        FAIR.
OUTLOOK FOR TUE MAY 13        FAIR.

VENTILATION INDEX (CATEGORY)  65 (POOR).          615 (GOOD).
OUTLOOK FOR MON MAY 12        535 (FAIR).
OUTLOOK FOR TUE MAY 13        397 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-4 MPH.         NW 7-15 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         W 10-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON MAY 12        FAIR.
OUTLOOK FOR TUE MAY 13        GOOD.

VENTILATION INDEX (CATEGORY)  48 (POOR).          254 (POOR).
OUTLOOK FOR MON MAY 12        246 (POOR).
OUTLOOK FOR TUE MAY 13        514 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 3-9 MPH.         NW 8-12 MPH.
TRANSPORT WINDS               SW 6-10 MPH.        NW 8-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON MAY 12        FAIR.
OUTLOOK FOR TUE MAY 13        FAIR.

VENTILATION INDEX (CATEGORY)  77 (POOR).          257 (POOR).
OUTLOOK FOR MON MAY 12        466 (FAIR).
OUTLOOK FOR TUE MAY 13        484 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      415 (FAIR)
ELLENSBURG    459 (FAIR)
GOLDENDALE    735 (GOOD)
TRI-CITIES    357 (FAIR)
WALLA WALLA   228 (POOR)
YAKIMA        658 (GOOD)
BEND         1050 (GOOD)
PRINEVILLE    867 (GOOD)
ENTERPRISE   1035 (GOOD)
HERMISTON     353 (FAIR)
JOHN DAY     1050 (GOOD)
LA GRANDE     222 (POOR)
MADRAS        627 (GOOD)
MEACHAM       187 (POOR)
PENDLETON     330 (FAIR)
REDMOND       979 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    674 (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.
$$