479
AUUS46 KPDT 291325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST SAT NOV 29 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NE 2-6 MPH.         NW 4-8 MPH.
TRANSPORT WINDS               NE 3-7 MPH.         N 4-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN NOV 30        POOR.
OUTLOOK FOR MON DEC 1         POOR.

VENTILATION INDEX (CATEGORY)  27 (POOR).          59 (POOR).
OUTLOOK FOR SUN NOV 30        72 (POOR).
OUTLOOK FOR MON DEC 1         32 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 2-5 MPH.          N 3-7 MPH.
TRANSPORT WINDS               N 3-7 MPH.          N 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN NOV 30        POOR.
OUTLOOK FOR MON DEC 1         POOR.

VENTILATION INDEX (CATEGORY)  30 (POOR).          91 (POOR).
OUTLOOK FOR SUN NOV 30        42 (POOR).
OUTLOOK FOR MON DEC 1         38 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 1-3 MPH.          S 7-12 MPH.
TRANSPORT WINDS               SE 3-6 MPH.         S 16-23 MPH.
MIXING HEIGHT                 4000 FT MSL.        5000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN NOV 30        FAIR.
OUTLOOK FOR MON DEC 1         POOR.

VENTILATION INDEX (CATEGORY)  59 (POOR).          301 (FAIR).
OUTLOOK FOR SUN NOV 30        160 (POOR).
OUTLOOK FOR MON DEC 1         120 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 3-7 MPH.          NW 2-5 MPH.
TRANSPORT WINDS               SE 4-8 MPH.         E 3-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN NOV 30        POOR.
OUTLOOK FOR MON DEC 1         POOR.

VENTILATION INDEX (CATEGORY)  31 (POOR).          40 (POOR).
OUTLOOK FOR SUN NOV 30        86 (POOR).
OUTLOOK FOR MON DEC 1         51 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      210 (POOR)
ELLENSBURG     80 (POOR)
GOLDENDALE    118 (POOR)
TRI-CITIES    103 (POOR)
WALLA WALLA    27 (POOR)
YAKIMA        108 (POOR)
BEND          103 (POOR)
PRINEVILLE     68 (POOR)
ENTERPRISE     59 (POOR)
HERMISTON      55 (POOR)
JOHN DAY      228 (POOR)
LA GRANDE     366 (FAIR)
MADRAS         40 (POOR)
MEACHAM        97 (POOR)
PENDLETON      50 (POOR)
REDMOND        26 (POOR)
SENECA        271 (POOR)
THE DALLES    146 (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.
$$