019
AUUS46 KPDT 011325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST MON DEC  1 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 1-3 MPH.         NW 1-3 MPH.
TRANSPORT WINDS               E 2-4 MPH.          S 2-4 MPH.
MIXING HEIGHT                 NEAR SURFACE.       NEAR SURFACE.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE DEC 2         POOR.
OUTLOOK FOR WED DEC 3         POOR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          25 (POOR).
OUTLOOK FOR TUE DEC 2         66 (POOR).
OUTLOOK FOR WED DEC 3         42 (POOR).

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

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

VENTILATION INDEX (CATEGORY)  25 (POOR).          28 (POOR).
OUTLOOK FOR TUE DEC 2         45 (POOR).
OUTLOOK FOR WED DEC 3         43 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 1-3 MPH.         S 3-6 MPH.
TRANSPORT WINDS               S 4-4 MPH.          S 6-9 MPH.
MIXING HEIGHT                 4000 FT MSL.        4000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE DEC 2         FAIR.
OUTLOOK FOR WED DEC 3         POOR.

VENTILATION INDEX (CATEGORY)  47 (POOR).          102 (POOR).
OUTLOOK FOR TUE DEC 2         200 (POOR).
OUTLOOK FOR WED DEC 3         38 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-5 MPH.         W 1-3 MPH.
TRANSPORT WINDS               S 3-6 MPH.          S 2-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       NEAR SURFACE.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE DEC 2         POOR.
OUTLOOK FOR WED DEC 3         POOR.

VENTILATION INDEX (CATEGORY)  30 (POOR).          30 (POOR).
OUTLOOK FOR TUE DEC 2         127 (POOR).
OUTLOOK FOR WED DEC 3         79 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      166 (POOR)
ELLENSBURG     69 (POOR)
GOLDENDALE     48 (POOR)
TRI-CITIES     28 (POOR)
WALLA WALLA    25 (POOR)
YAKIMA         32 (POOR)
BEND           48 (POOR)
PRINEVILLE     30 (POOR)
ENTERPRISE     38 (POOR)
HERMISTON      25 (POOR)
JOHN DAY       83 (POOR)
LA GRANDE      68 (POOR)
MADRAS         50 (POOR)
MEACHAM        29 (POOR)
PENDLETON      25 (POOR)
REDMOND        25 (POOR)
SENECA        110 (POOR)
THE DALLES     39 (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.
$$