195
AUUS46 KPDT 191325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST MON JAN 19 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 1-3 MPH.          N 2-5 MPH.
TRANSPORT WINDS               NE 1-3 MPH.         NE 2-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE JAN 20        POOR.
OUTLOOK FOR WED JAN 21        POOR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          49 (POOR).
OUTLOOK FOR TUE JAN 20        72 (POOR).
OUTLOOK FOR WED JAN 21        55 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-3 MPH.         SE 2-2 MPH.
TRANSPORT WINDS               SE 1-3 MPH.         SE 1-3 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE JAN 20        POOR.
OUTLOOK FOR WED JAN 21        POOR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          33 (POOR).
OUTLOOK FOR TUE JAN 20        58 (POOR).
OUTLOOK FOR WED JAN 21        40 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-3 MPH.         S 4-8 MPH.
TRANSPORT WINDS               N 4-9 MPH.          S 5-9 MPH.
MIXING HEIGHT                 4000 FT MSL.        4500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE JAN 20        POOR.
OUTLOOK FOR WED JAN 21        FAIR.

VENTILATION INDEX (CATEGORY)  39 (POOR).          80 (POOR).
OUTLOOK FOR TUE JAN 20        86 (POOR).
OUTLOOK FOR WED JAN 21        128 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 1-3 MPH.          NW 1-3 MPH.
TRANSPORT WINDS               NE 2-5 MPH.         N 2-4 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE JAN 20        POOR.
OUTLOOK FOR WED JAN 21        POOR.

VENTILATION INDEX (CATEGORY)  27 (POOR).          35 (POOR).
OUTLOOK FOR TUE JAN 20        35 (POOR).
OUTLOOK FOR WED JAN 21        37 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      103 (POOR)
ELLENSBURG     40 (POOR)
GOLDENDALE     73 (POOR)
TRI-CITIES     46 (POOR)
WALLA WALLA    37 (POOR)
YAKIMA         32 (POOR)
BEND           27 (POOR)
PRINEVILLE     34 (POOR)
ENTERPRISE     25 (POOR)
HERMISTON      47 (POOR)
JOHN DAY       95 (POOR)
LA GRANDE      86 (POOR)
MADRAS         25 (POOR)
MEACHAM        27 (POOR)
PENDLETON      56 (POOR)
REDMOND        30 (POOR)
SENECA         89 (POOR)
THE DALLES    198 (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.
$$