322
AUUS46 KPDT 161225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE SEP 16 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 2-6 MPH.          N 5-9 MPH.
TRANSPORT WINDS               NE 4-9 MPH.         NE 5-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 17        POOR.
OUTLOOK FOR THU SEP 18        POOR.

VENTILATION INDEX (CATEGORY)  33 (POOR).          143 (POOR).
OUTLOOK FOR WED SEP 17        91 (POOR).
OUTLOOK FOR THU SEP 18        86 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         E 5-9 MPH.
TRANSPORT WINDS               N 6-11 MPH.         E 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 17        POOR.
OUTLOOK FOR THU SEP 18        POOR.

VENTILATION INDEX (CATEGORY)  72 (POOR).          251 (POOR).
OUTLOOK FOR WED SEP 17        98 (POOR).
OUTLOOK FOR THU SEP 18        64 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NE 2-5 MPH.         S 4-8 MPH.
TRANSPORT WINDS               E 3-6 MPH.          S 8-12 MPH.
MIXING HEIGHT                 4000 FT MSL.        8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 17        FAIR.
OUTLOOK FOR THU SEP 18        GOOD.

VENTILATION INDEX (CATEGORY)  44 (POOR).          336 (FAIR).
OUTLOOK FOR WED SEP 17        417 (FAIR).
OUTLOOK FOR THU SEP 18        237 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 5-10 MPH.        N 4-7 MPH.
TRANSPORT WINDS               SE 6-11 MPH.        E 6-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 17        POOR.
OUTLOOK FOR THU SEP 18        POOR.

VENTILATION INDEX (CATEGORY)  53 (POOR).          170 (POOR).
OUTLOOK FOR WED SEP 17        126 (POOR).
OUTLOOK FOR THU SEP 18        98 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      786 (GOOD)
ELLENSBURG    647 (GOOD)
GOLDENDALE    511 (FAIR)
TRI-CITIES    115 (POOR)
WALLA WALLA    92 (POOR)
YAKIMA        329 (FAIR)
BEND          390 (FAIR)
PRINEVILLE    625 (GOOD)
ENTERPRISE    270 (POOR)
HERMISTON     160 (POOR)
JOHN DAY      461 (FAIR)
LA GRANDE     407 (FAIR)
MADRAS        279 (POOR)
MEACHAM       347 (FAIR)
PENDLETON     242 (POOR)
REDMOND       557 (FAIR)
SENECA        468 (FAIR)
THE DALLES    616 (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.
$$