912
AUUS46 KPDT 061325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST SAT DEC  6 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 23-39 MPH.       SW 17-23 MPH.
TRANSPORT WINDS               SW 23-38 MPH.       SW 25-29 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SUN DEC 7         FAIR.
OUTLOOK FOR MON DEC 8         GOOD.

VENTILATION INDEX (CATEGORY)  169 (POOR).         572 (FAIR).
OUTLOOK FOR SUN DEC 7         133 (POOR).
OUTLOOK FOR MON DEC 8         149 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 20-29 MPH.        W 10-17 MPH.
TRANSPORT WINDS               W 20-29 MPH.        W 17-24 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SUN DEC 7         FAIR.
OUTLOOK FOR MON DEC 8         GOOD.

VENTILATION INDEX (CATEGORY)  164 (POOR).         495 (FAIR).
OUTLOOK FOR SUN DEC 7         158 (POOR).
OUTLOOK FOR MON DEC 8         192 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 18-25 MPH.        W 11-13 MPH.
TRANSPORT WINDS               W 20-25 MPH.        W 15-21 MPH.
MIXING HEIGHT                 4000 FT MSL.        5500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SUN DEC 7         FAIR.
OUTLOOK FOR MON DEC 8         FAIR.

VENTILATION INDEX (CATEGORY)  287 (POOR).         542 (FAIR).
OUTLOOK FOR SUN DEC 7         322 (FAIR).
OUTLOOK FOR MON DEC 8         212 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 23-38 MPH.       SW 17-27 MPH.
TRANSPORT WINDS               SW 24-38 MPH.       SW 21-27 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SUN DEC 7         GOOD.
OUTLOOK FOR MON DEC 8         GOOD.

VENTILATION INDEX (CATEGORY)  229 (POOR).         586 (FAIR).
OUTLOOK FOR SUN DEC 7         226 (POOR).
OUTLOOK FOR MON DEC 8         170 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      831 (GOOD)
ELLENSBURG    585 (FAIR)
GOLDENDALE    652 (GOOD)
TRI-CITIES    377 (FAIR)
WALLA WALLA   483 (FAIR)
YAKIMA        356 (FAIR)
BEND          531 (FAIR)
PRINEVILLE    479 (FAIR)
ENTERPRISE    847 (GOOD)
HERMISTON     705 (GOOD)
JOHN DAY      592 (FAIR)
LA GRANDE     643 (GOOD)
MADRAS        696 (GOOD)
MEACHAM       539 (FAIR)
PENDLETON     723 (GOOD)
REDMOND       509 (FAIR)
SENECA        698 (GOOD)
THE DALLES    707 (GOOD)

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.
$$