405
AUUS46 KPDT 121325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST WED NOV 12 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 1-4 MPH.          N 3-6 MPH.
TRANSPORT WINDS               N 3-7 MPH.          N 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       NEAR SURFACE.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU NOV 13        POOR.
OUTLOOK FOR FRI NOV 14        GOOD.

VENTILATION INDEX (CATEGORY)  26 (POOR).          46 (POOR).
OUTLOOK FOR THU NOV 13        58 (POOR).
OUTLOOK FOR FRI NOV 14        561 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-4 MPH.         SE 2-5 MPH.
TRANSPORT WINDS               N 2-4 MPH.          SE 2-4 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU NOV 13        POOR.
OUTLOOK FOR FRI NOV 14        GOOD.

VENTILATION INDEX (CATEGORY)  26 (POOR).          38 (POOR).
OUTLOOK FOR THU NOV 13        35 (POOR).
OUTLOOK FOR FRI NOV 14        458 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 7-12 MPH.        S 11-14 MPH.
TRANSPORT WINDS               S 10-14 MPH.        S 17-20 MPH.
MIXING HEIGHT                 4000 FT MSL.        5500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU NOV 13        GOOD.
OUTLOOK FOR FRI NOV 14        FAIR.

VENTILATION INDEX (CATEGORY)  126 (POOR).         405 (FAIR).
OUTLOOK FOR THU NOV 13        670 (GOOD).
OUTLOOK FOR FRI NOV 14        418 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-5 MPH.         N 4-5 MPH.
TRANSPORT WINDS               SE 4-9 MPH.         W 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU NOV 13        FAIR.
OUTLOOK FOR FRI NOV 14        GOOD.

VENTILATION INDEX (CATEGORY)  33 (POOR).          42 (POOR).
OUTLOOK FOR THU NOV 13        249 (POOR).
OUTLOOK FOR FRI NOV 14        584 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      121 (POOR)
ELLENSBURG     56 (POOR)
GOLDENDALE     51 (POOR)
TRI-CITIES     54 (POOR)
WALLA WALLA    32 (POOR)
YAKIMA         39 (POOR)
BEND          436 (FAIR)
PRINEVILLE    339 (FAIR)
ENTERPRISE    174 (POOR)
HERMISTON      43 (POOR)
JOHN DAY      503 (FAIR)
LA GRANDE     338 (FAIR)
MADRAS        201 (POOR)
MEACHAM       148 (POOR)
PENDLETON      45 (POOR)
REDMOND       358 (FAIR)
SENECA        557 (FAIR)
THE DALLES     64 (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.
$$