695
AUUS46 KPDT 301325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST SUN NOV 30 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 2-5 MPH.         SW 2-4 MPH.
TRANSPORT WINDS               W 4-7 MPH.          SW 2-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON DEC 1         POOR.
OUTLOOK FOR TUE DEC 2         POOR.

VENTILATION INDEX (CATEGORY)  32 (POOR).          83 (POOR).
OUTLOOK FOR MON DEC 1         28 (POOR).
OUTLOOK FOR TUE DEC 2         71 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-5 MPH.          S 2-4 MPH.
TRANSPORT WINDS               NW 4-7 MPH.         SW 2-4 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON DEC 1         POOR.
OUTLOOK FOR TUE DEC 2         POOR.

VENTILATION INDEX (CATEGORY)  31 (POOR).          43 (POOR).
OUTLOOK FOR MON DEC 1         30 (POOR).
OUTLOOK FOR TUE DEC 2         60 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-10 MPH.        NW 3-6 MPH.
TRANSPORT WINDS               NW 7-11 MPH.        NW 7-12 MPH.
MIXING HEIGHT                 4000 FT MSL.        5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON DEC 1         POOR.
OUTLOOK FOR TUE DEC 2         FAIR.

VENTILATION INDEX (CATEGORY)  94 (POOR).          178 (POOR).
OUTLOOK FOR MON DEC 1         100 (POOR).
OUTLOOK FOR TUE DEC 2         165 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 2-7 MPH.         SW 2-6 MPH.
TRANSPORT WINDS               SW 5-9 MPH.         W 3-8 MPH.
MIXING HEIGHT                 2000 FT MSL.        2500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON DEC 1         POOR.
OUTLOOK FOR TUE DEC 2         POOR.

VENTILATION INDEX (CATEGORY)  61 (POOR).          91 (POOR).
OUTLOOK FOR MON DEC 1         36 (POOR).
OUTLOOK FOR TUE DEC 2         127 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       54 (POOR)
ELLENSBURG     39 (POOR)
GOLDENDALE     62 (POOR)
TRI-CITIES     61 (POOR)
WALLA WALLA   115 (POOR)
YAKIMA         26 (POOR)
BEND           82 (POOR)
PRINEVILLE     90 (POOR)
ENTERPRISE    133 (POOR)
HERMISTON      57 (POOR)
JOHN DAY      160 (POOR)
LA GRANDE     212 (POOR)
MADRAS         86 (POOR)
MEACHAM        67 (POOR)
PENDLETON     100 (POOR)
REDMOND        79 (POOR)
SENECA        174 (POOR)
THE DALLES     98 (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.
$$