545
AUUS46 KPDT 031325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST WED DEC  3 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-5 MPH.         N 2-5 MPH.
TRANSPORT WINDS               SE 2-4 MPH.         SW 2-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU DEC 4         POOR.
OUTLOOK FOR FRI DEC 5         FAIR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          31 (POOR).
OUTLOOK FOR THU DEC 4         68 (POOR).
OUTLOOK FOR FRI DEC 5         92 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 0-2 MPH.          E 1-3 MPH.
TRANSPORT WINDS               E 2-5 MPH.          SE 2-3 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU DEC 4         POOR.
OUTLOOK FOR FRI DEC 5         POOR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          31 (POOR).
OUTLOOK FOR THU DEC 4         31 (POOR).
OUTLOOK FOR FRI DEC 5         69 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 1-3 MPH.          SW 2-2 MPH.
TRANSPORT WINDS               NW 3-7 MPH.         NW 2-4 MPH.
MIXING HEIGHT                 4000 FT MSL.        4500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU DEC 4         POOR.
OUTLOOK FOR FRI DEC 5         POOR.

VENTILATION INDEX (CATEGORY)  46 (POOR).          62 (POOR).
OUTLOOK FOR THU DEC 4         158 (POOR).
OUTLOOK FOR FRI DEC 5         180 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-5 MPH.         W 2-4 MPH.
TRANSPORT WINDS               S 5-6 MPH.          SW 2-4 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU DEC 4         FAIR.
OUTLOOK FOR FRI DEC 5         FAIR.

VENTILATION INDEX (CATEGORY)  33 (POOR).          42 (POOR).
OUTLOOK FOR THU DEC 4         119 (POOR).
OUTLOOK FOR FRI DEC 5         156 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      123 (POOR)
ELLENSBURG     38 (POOR)
GOLDENDALE     50 (POOR)
TRI-CITIES     36 (POOR)
WALLA WALLA    29 (POOR)
YAKIMA         25 (POOR)
BEND           88 (POOR)
PRINEVILLE     58 (POOR)
ENTERPRISE     68 (POOR)
HERMISTON      25 (POOR)
JOHN DAY       76 (POOR)
LA GRANDE      73 (POOR)
MADRAS         59 (POOR)
MEACHAM        37 (POOR)
PENDLETON      31 (POOR)
REDMOND        70 (POOR)
SENECA        107 (POOR)
THE DALLES     25 (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.
$$