151
AUUS46 KPDT 241325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST MON NOV 24 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 14-28 MPH.       SW 11-15 MPH.
TRANSPORT WINDS               W 16-28 MPH.        W 15-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           GOOD.               FAIR.
OUTLOOK FOR TUE NOV 25        POOR.
OUTLOOK FOR WED NOV 26        POOR.

VENTILATION INDEX (CATEGORY)  108 (POOR).         417 (FAIR).
OUTLOOK FOR TUE NOV 25        28 (POOR).
OUTLOOK FOR WED NOV 26        40 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 6-12 MPH.         W 4-8 MPH.
TRANSPORT WINDS               W 7-13 MPH.         W 7-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE NOV 25        POOR.
OUTLOOK FOR WED NOV 26        POOR.

VENTILATION INDEX (CATEGORY)  50 (POOR).          187 (POOR).
OUTLOOK FOR TUE NOV 25        30 (POOR).
OUTLOOK FOR WED NOV 26        35 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 10-13 MPH.        NW 8-10 MPH.
TRANSPORT WINDS               W 13-19 MPH.        W 13-17 MPH.
MIXING HEIGHT                 4500 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR TUE NOV 25        GOOD.
OUTLOOK FOR WED NOV 26        POOR.

VENTILATION INDEX (CATEGORY)  304 (FAIR).         734 (GOOD).
OUTLOOK FOR TUE NOV 25        376 (FAIR).
OUTLOOK FOR WED NOV 26        183 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 15-29 MPH.       W 10-18 MPH.
TRANSPORT WINDS               W 19-27 MPH.        W 16-19 MPH.
MIXING HEIGHT                 2000 FT MSL.        4500 FT MSL.
DISPERSION CATEGORY           GOOD.               FAIR.
OUTLOOK FOR TUE NOV 25        POOR.
OUTLOOK FOR WED NOV 26        POOR.

VENTILATION INDEX (CATEGORY)  187 (POOR).         554 (FAIR).
OUTLOOK FOR TUE NOV 25        70 (POOR).
OUTLOOK FOR WED NOV 26        54 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      599 (FAIR)
ELLENSBURG    512 (FAIR)
GOLDENDALE    442 (FAIR)
TRI-CITIES    287 (POOR)
WALLA WALLA   462 (FAIR)
YAKIMA        160 (POOR)
BEND          250 (POOR)
PRINEVILLE    334 (FAIR)
ENTERPRISE    807 (GOOD)
HERMISTON     455 (FAIR)
JOHN DAY      709 (GOOD)
LA GRANDE     817 (GOOD)
MADRAS        295 (POOR)
MEACHAM       570 (FAIR)
PENDLETON     673 (GOOD)
REDMOND       304 (FAIR)
SENECA        585 (FAIR)
THE DALLES    521 (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.
$$